阅读说明：本技术 一种用于地下空间止水帷幕渗漏的监测方法 (Method for monitoring leakage of waterproof curtain in underground space ) 是由 李金芳 于 2020-11-10 设计创作，主要内容包括：本发明公开了一种用于地下空间止水帷幕渗漏的监测方法,其包括以下步骤：步骤一、在地下空间止水帷幕外侧建立监测区域；步骤二、在止水帷幕发生渗漏时,膨胀物遇水后发生自然膨胀使悬臂梁向上弯曲,使得上极板和下极板的电容值发生了变化；止水帷幕外侧的水将向渗漏点流动,从而对光纤有微压力,导致光在光纤中的传导特性发生了改变；步骤三：单片机采集到的电容值和应变值通过无线通信模块发送给数据终端；微动传感光纤检测到的微动压力场信号；步骤四：将获取的信号综合分析以定位渗漏点位置以及评估渗漏强度。该发明能有效而精确地监测止水帷幕细微的渗漏点及评估渗漏程度,避免危险事件的发生。(The invention discloses a method for monitoring leakage of a waterproof curtain in an underground space, which comprises the following steps of: step one, establishing a monitoring area at the outer side of a waterproof curtain of an underground space; step two, when the waterproof curtain leaks, the expansion object naturally expands after meeting water to enable the cantilever beam to bend upwards, so that capacitance values of the upper polar plate and the lower polar plate are changed; water on the outer side of the waterproof curtain flows to a leakage point, so that micro pressure is applied to the optical fiber, and the transmission characteristic of light in the optical fiber is changed; step three: the capacitance value and the strain value acquired by the singlechip are sent to a data terminal through a wireless communication module; micro pressure field signals detected by the micro sensing optical fiber; step four: the acquired signals are analyzed comprehensively to locate the leak site and evaluate the leak strength. The invention can effectively and accurately monitor the tiny leakage points of the waterproof curtain and evaluate the leakage degree, thereby avoiding the occurrence of dangerous events.)

1. A monitoring method for seepage of a waterproof curtain in an underground space is characterized by comprising the following steps:

the method comprises the following steps: establishing a monitoring area at the outer side of the underground space waterproof curtain, dividing the monitoring area into n rectangular subregions with the same area size, and placing an inner side sensing module in each rectangular subregion and numbering the inner side sensing modules;

step two: when the waterproof curtain leaks, the expansion object naturally expands after meeting water to enable the cantilever beam to bend upwards, and further the strain gauge is caused to bend, so that the resistance value of the strain gauge changes; the swelling matter absorbs moisture, and simultaneously, the medium and the distance between the upper polar plate and the lower polar plate are changed, so that the capacitance values of the upper polar plate and the lower polar plate are changed; water on the outer side of the waterproof curtain flows to a leakage point, so that micro pressure is applied to the optical fiber, and the transmission characteristic of light in the optical fiber is changed;

step three: the capacitance value and the strain value acquired by the singlechip are sent to a data terminal through a wireless communication module; micro pressure field signals detected by the micro sensing optical fiber;

step four: and the data terminal comprehensively analyzes the capacitance value and the strain value obtained by the composite wet pressure sensor and the micro-motion pressure field signal detected by the micro-motion sensing optical fiber, so as to position the position of the leakage point and evaluate the leakage strength.

2. The method for monitoring the leakage of the waterproof curtain in the underground space according to the claim 1, wherein the method comprises the following steps: the first step further comprises: and a micro-motion sensing optical fiber is arranged on the outer side of the waterproof curtain.

3. A method for monitoring the leakage of waterproof curtains in underground spaces according to claims 1 and 2, characterized in that: the second step further comprises: the measurement is completed by an Optical Time Domain Reflectometer (OTDR), and the micro-motion pressure field signal is obtained by analyzing different parts of different optical fibers.

4. The method for monitoring the leakage of the waterproof curtain in the underground space according to the claim 1, wherein the method comprises the following steps: in the third step, the method further comprises: and the optical time domain reflectometer is connected with a data terminal and sends a micro-motion pressure field signal.

5. The method for monitoring the leakage of the waterproof curtain in the underground space according to the claim 1, wherein the method comprises the following steps: the expansion object is arranged between the upper polar plate and the lower polar plate, and the expansion object expands towards the upper polar plate and the lower polar plate after meeting water.

6. The method for monitoring the leakage of the waterproof curtain in the underground space according to the claim 1, wherein the method comprises the following steps: and the capacitance value and the strain value collected by the singlechip are transmitted to the data terminal only when the capacitance value and the strain value exceed a certain threshold value.

7. The method for monitoring the leakage of the waterproof curtain in the underground space according to the claim 1, wherein the method comprises the following steps: when the waterproof curtain has a leakage point, water on the outer side of the waterproof curtain flows to the leakage point, so that micro pressure is applied to the optical fiber, the transmission characteristic of light in the optical fiber is changed, micro pressure field signals are obtained by analyzing different parts of different optical fibers, and the position of the leakage point and the severity of leakage are presumed according to the intensity distribution of the pressure field.

Technical Field

The invention relates to the technical field of waterproof curtain leakage monitoring of underground space structures, in particular to a method for monitoring leakage of a waterproof curtain of an underground space.

Background

The waterproof curtain as an underground space structure often leaks to various degrees due to construction processes or construction problems and the like. Under the condition that a water head difference occurs inside and outside a foundation pit, water leakage with different degrees can occur, the leakage of the waterproof curtain can bring great influence to the foundation pit and the surrounding environment, and the serious leakage can also cause the phenomena of quicksand and piping, so that the ground collapses, pipelines break, buildings crack and the like, even the life is threatened, so the monitoring of the leakage of the waterproof curtain in the underground space is particularly important, and particularly, the leakage point can be accurately positioned.

In the prior art, as shown in fig. 1, application No. 201811454453.6 discloses a method for detecting wall leakage by direct current focusing, which includes: a focusing transmitting electrode capable of moving up and down is placed in a transmitting hole on the outer side of the waterproof curtain, and a receiving electrode array is fixedly placed in an observation hole on the outer side of the waterproof curtain; a loop electrode which can move up and down is arranged in a precipitation hole on the inner side of the waterproof curtain, a receiving electrode array is fixedly arranged in an observation hole on the inner side of the waterproof curtain, and a receiving plane formed by an electrode distribution array is fixedly arranged on the ground on the inner side of the waterproof curtain; moving a loop electrode in a water dropping hole on the inner side of the waterproof curtain to measure; moving a focusing emission electrode in an emission hole at the outer side of the waterproof curtain to measure; the potential signals are processed in a computer.

As shown in fig. 2, application No. 201510690599.0 discloses a method for determining the influence of the leakage of a waterproof curtain below the excavation surface of a foundation pit on the surrounding environment, which comprises: on the basis of on-site investigation and collection of foundation pit information, the leakage position and the leakage area of a waterproof curtain are determined by adopting an ultrasonic imaging CT technology, and data such as an actual measurement value of the water level of an observation well are obtained through a foundation pit pumping test; establishing a three-dimensional fluid-solid coupling model, arranging a leakage unit at the leakage position of the waterproof curtain according to the leakage area, simulating a water pumping test, performing analysis model calculation, and finally obtaining a calculated value of the water level of the observation well; determining the permeability coefficient of the water-stopping curtain leakage position according to the fitting condition of the measured value and the calculated value; and (4) carrying out seepage consolidation simulation on the seepage coefficient of the input seepage position of the seepage unit, and finally determining the underground water level and the ground settlement around the foundation pit.

However, in practical application, the prior art has the problems that a tiny leakage point is missed, the change of monitored data is not obvious when the tiny leakage exists, and potential safety hazards exist.

Disclosure of Invention

The invention provides a method for monitoring leakage of a waterproof curtain in an underground space, which can solve the problem of monitoring fine leakage points, can monitor a water leakage area even if the waterproof curtain has the fine leakage points in time, and avoids dangerous events.

In order to solve the technical problems, the invention adopts a technical scheme that:

a monitoring method for seepage of a waterproof curtain in an underground space comprises the following steps:

the method comprises the following steps: a monitoring area is established on the outer side of the underground space waterproof curtain, the monitoring area is divided into n rectangular subregions with the same area, and each rectangular subregion is provided with an inner side sensing module and is numbered.

Step two: when the waterproof curtain leaks, the expansion object naturally expands after meeting water to enable the cantilever beam to bend upwards, and further the strain gauge is caused to bend, so that the resistance value of the strain gauge changes; the swelling matter absorbs moisture, and simultaneously, the medium and the distance between the upper polar plate and the lower polar plate are changed, so that the capacitance values of the upper polar plate and the lower polar plate are changed; water outside the waterproof curtain will flow towards the leak point and thus have a slight pressure on the optical fibre, resulting in a change in the light transmission characteristics in the optical fibre.

Step three: the capacitance value and the strain value acquired by the singlechip are sent to a data terminal through a wireless communication module; and a micro pressure field signal detected by the micro sensing optical fiber.

Step four: and the data terminal comprehensively analyzes the capacitance value and the strain value obtained by the composite wet pressure sensor and the micro-motion pressure field signal detected by the micro-motion sensing optical fiber, so as to position the position of the leakage point and evaluate the leakage strength.

Further, the first step further includes: and a micro-motion sensing optical fiber is arranged on the outer side of the waterproof curtain.

Further, the second step further includes: the measurement is completed by an Optical Time Domain Reflectometer (OTDR), and the micro-motion pressure field signal is obtained by analyzing different parts of different optical fibers.

Further, the third step further includes: and the optical time domain reflectometer is connected with a data terminal and sends a micro-motion pressure field signal.

Furthermore, the invention also discloses a device for monitoring the leakage of the waterproof curtain in the underground space, wherein the device for monitoring the leakage of the waterproof curtain comprises an inner side sensing system, an outer side optical fiber system and a data terminal, wherein the inner side sensing system, the outer side optical fiber system and the data terminal are formed by a plurality of inner side sensing modules; the inner side sensing module comprises a composite wet pressure sensor, a micro-motion sensing optical fiber, a single chip microcomputer and a wireless communication module; the composite wet pressure sensor, the wireless communication module and the single chip microcomputer are connected; the outside optical fiber system comprises a micro-motion sensing optical fiber and an optical time domain reflectometer, the micro-motion sensing optical fiber is distributed along different monitoring areas and is connected with the optical time domain reflectometer; the optical time domain reflectometer and the inner side sensing system are connected with a data terminal.

The composite wet pressure sensor comprises a strain gauge, a cantilever beam, an upper polar plate, an expansion object, a lower polar plate and a waterproof shell; the utility model discloses a waterproof curtain, including the compound wet pressure sensor, the compound wet pressure sensor has the one side of inlet opening and installs the inboard at the waterproof curtain, the bonding of one side of foil gage and cantilever beam, the other side of cantilever beam and the one side butt of last polar plate, the opposite side of going up the polar plate and the one end bonding of inflation thing, the other end bonding of bottom plate and inflation thing, the one end of cantilever beam is fixed on waterproof shell, the both ends of bottom plate are fixed on waterproof shell, waterproof shell places the position of inflation thing and is provided with the inlet opening, the inboard at the waterproof curtain is installed to.

The expansion object is arranged between the upper polar plate and the lower polar plate, and the expansion object expands towards the upper polar plate and the lower polar plate after meeting water.

The strain gauge is adhered to one side of the cantilever beam, when an expansion object meets water, the expansion object naturally expands to enable the cantilever beam to bend upwards, so that the strain gauge is caused to bend, the resistance value of the strain gauge changes, the current value passing through the strain gauge is amplified through an amplifier, the amplified current value is transmitted to a single chip microcomputer for processing after A/D conversion, and the single chip microcomputer transmits the strain value reflecting the deformation amount of the expansion object, namely the water seepage amount to a data terminal through a wireless communication module; when the swelling matter is in water, the swelling matter expands in two directions to the upper polar plate and the lower polar plate, and the swelling matter absorbs moisture, so that the distance between the upper polar plate and the lower polar plate and the medium are changed, the capacitance values of the upper polar plate and the lower polar plate are changed, and the capacitance values reflecting the water absorption capacity are also transmitted to the single chip microcomputer for processing after signal processing; similarly, the single chip microcomputer transmits the capacitance value reflecting the water absorption amount to the data terminal through the wireless communication module.

Further, the capacitance value and the strain value acquired by the singlechip are sent to the data terminal only when the capacitance value and the strain value exceed a certain threshold value;

furthermore, the wireless communication module adopts a ZigBee technology of an ad hoc network communication module, a monitoring area is divided into n rectangular subregions with the same area, an inner side sensing module is arranged in each rectangular subregion and is numbered, and a micro-motion sensing optical fiber is arranged on the outer side of the waterproof curtain; each rectangular sub-area is used as a monitoring node, all nodes form an ad hoc network through a wireless communication module, real-time data communication can be carried out among any nodes in the ad hoc network, and finally all monitoring data are collected to a data terminal.

The micro-motion sensing optical fiber is placed at the outer side of the waterproof curtain, and the micro-motion sensing optical fiber measures or monitors information which is distributed along the space of an optical fiber transmission path and changes along time by adopting a unique distributed optical fiber detection technology; when the waterproof curtain has a leakage point, water on the outer side of the waterproof curtain flows to the leakage point, so that micro pressure is applied to the optical fiber, the transmission characteristic of light in the optical fiber is changed, micro pressure field signals are obtained by analyzing different parts of different optical fibers, and the position of the leakage point and the severity of leakage are presumed according to the intensity distribution of the pressure field.

Further, the optical time domain reflectometer is connected with a data terminal, and the data terminal comprehensively analyzes the capacitance value and the strain value obtained by the composite wet pressure sensor and the micro-motion pressure field signal detected by the micro-motion sensing optical fiber, so as to position the position of the leakage point and evaluate the leakage strength.

Compared with the prior art, the invention has the following beneficial effects:

1. according to the method for monitoring the leakage of the waterproof curtain in the underground space, the seepage points and the seepage areas are timely monitored through the composite wet pressure sensor, even if the waterproof curtain has fine seepage points due to the fact that the expansion object naturally expands when meeting water.

2. According to the method for monitoring the leakage of the waterproof curtain in the underground space, the leakage of the waterproof curtain and the flow of water outside the waterproof curtain can be monitored through the micro-motion sensing optical fiber.

3. According to the method for monitoring the leakage of the waterproof curtain in the underground space, the monitoring data of the composite wet pressure sensor is combined with the monitoring data of the micro-motion sensing optical fiber to comprehensively judge the leakage condition of the waterproof curtain, so that the waterproof curtain is effectively and accurately monitored in real time.

Drawings

Fig. 1 is a schematic diagram of a dc focusing fine detection method for wall leakage in the prior art.

Fig. 2 is a schematic diagram of a method for determining the influence of the seepage of a waterproof curtain below a foundation pit excavation surface on the surrounding environment in the prior art.

Fig. 3 is a topology diagram of an ad hoc network of the present invention.

FIG. 4 is a schematic diagram of a composite wet pressure sensor system of the present invention.

FIG. 5 is a schematic view of the structure of the device of the present invention.

FIG. 6 is a flow chart of a monitoring method for monitoring the leakage of a waterproof curtain in an underground space.

In fig. 3-5: 1 singlechip, 2 compound wet pressure sensor, 3 wireless communication module, 4 data terminal, 5 inlet openings, 6 foil gage, 7 waterproof shell, 8 cantilever beam, 9 upper polar plate, 10 inflation thing, 11 lower polar plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

As shown in FIG. 6, the invention discloses a monitoring method for monitoring the leakage of a waterproof curtain in an underground space, which comprises the following steps:

the method comprises the following steps: a monitoring area is established on the outer side of the underground space water-stop curtain, the monitoring area is divided into n rectangular subregions with the same area, an inner side sensing module is placed in each rectangular subregion and is numbered, and a micro-motion sensing optical fiber is placed on the outer side of the water-stop curtain.

Step two: when the waterproof curtain leaks, the dilatant 10 naturally expands after encountering water to bend the cantilever beam 8 upwards, so that the strain gauge 6 is bent, and the resistance value of the strain gauge 6 is changed. The swelling matter 10 absorbs moisture, and simultaneously, the medium and the distance between the upper polar plate 9 and the lower polar plate 11 are changed, so that the capacitance values of the upper polar plate 9 and the lower polar plate 11 are changed; water on the outer side of the waterproof curtain flows to a leakage point, so that micro pressure is applied to the optical fiber, the transmission characteristic of light in the optical fiber is changed, the measurement is completed through an Optical Time Domain Reflectometer (OTDR), and micro pressure field signals are obtained through analyzing different parts of different optical fibers.

Step three: the capacitance value and the strain value acquired by the singlechip 1 are sent to a data terminal 4 through a wireless communication module 3; the micro-motion pressure field signal detected by the micro-motion sensing optical fiber is connected with the data terminal 4 through the optical time domain reflectometer and is sent out.

Step four: and the data terminal 4 comprehensively analyzes the capacitance value and the strain value obtained by the composite wet pressure sensor 2 and the micro-motion pressure field signal detected by the micro-motion sensing optical fiber, so as to position the position of the leakage point and evaluate the leakage strength.

Example 2

As shown in fig. 3-5, the waterproof curtain leakage monitoring device for the underground space comprises an inner side sensing system consisting of a plurality of inner side sensing modules, an outer side optical fiber system and a data terminal 4; the inner side sensing module comprises a composite wet pressure sensor 2, a micro-motion sensing optical fiber, a single chip microcomputer 1 and a wireless communication module 3; the composite wet pressure sensor 2, the wireless communication module 3 and the singlechip 1 are connected; the outside optical fiber system comprises a micro-motion sensing optical fiber and an optical time domain reflectometer, the micro-motion sensing optical fiber is distributed along different monitoring areas and is connected with the optical time domain reflectometer; the optical time domain reflectometer and the inner side sensing system are connected with the data terminal 4.

The composite wet pressure sensor 2 comprises a strain gauge 6, a cantilever beam 8, an upper polar plate 9, an expander 10, a lower polar plate 11 and a waterproof shell 7; one side bonding of foil gage 6 and cantilever beam 8, the other one side of cantilever beam 8 and the one side butt of last polar plate 9, the opposite side of going up polar plate 9 and the one end bonding of inflation thing 10, the other end bonding of bottom plate 11 and inflation thing 10, the one end of cantilever beam 8 is fixed on waterproof case 7, the both ends of bottom plate 11 are fixed on waterproof case 7, the position that inflation thing 10 was placed to waterproof case 7 is provided with inlet opening 5, the inboard at the waterproof curtain is installed to compound wet pressure sensor 2 one side that has inlet opening 5.

The expansion object 10 is placed between the upper pole plate 9 and the lower pole plate 11, and the expansion object 10 expands towards the upper pole plate 9 and the lower pole plate 11 after meeting water.

The strain gauge 6 is bonded with one side of the cantilever beam 8, when the swelling substance 10 is in water, the swelling substance naturally swells to enable the cantilever beam 8 to bend upwards, and further the strain gauge 6 is caused to bend, so that the resistance value of the strain gauge 6 changes, the current value passing through the strain gauge 6 is amplified through an amplifier and is transmitted to the singlechip 1 for processing after A/D conversion, and the singlechip 1 transmits a strain value reflecting the deformation amount of the swelling substance 10, namely the water seepage amount to the data terminal 4 through the wireless communication module 3; when the swelling substance 10 is in contact with water, the swelling substance expands in two directions towards the upper polar plate 9 and the lower polar plate 11, and the swelling substance 10 absorbs water, so that the distance between the upper polar plate 9 and the lower polar plate 11 and the medium change, the capacitance values of the upper polar plate 9 and the lower polar plate 11 change, and the capacitance values reflecting the water absorption amount are also transmitted to the single chip microcomputer 1 for processing after signal processing; similarly, the single chip microcomputer 1 transmits the capacitance value reflecting the water absorption amount to the data terminal 4 through the wireless communication module 3.

Further, the capacitance value and the strain value collected by the singlechip 1 are sent to the data terminal 4 only when the capacitance value and the strain value exceed a certain threshold value;

further, the wireless communication module 3 adopts a ZigBee technology of an ad hoc network communication module, a monitoring area is divided into n rectangular subregions with the same area, an inner side sensing module is arranged in each rectangular subregion and is numbered, and a micro-motion sensing optical fiber is arranged on the outer side of the waterproof curtain; each rectangular sub-area is used as a monitoring node, all nodes form an ad hoc network through the wireless communication module 3, any nodes in the ad hoc network can carry out real-time data communication, and finally all monitoring data are collected to the data terminal 4.

The micro-motion sensing optical fiber is placed at the outer side of the waterproof curtain, and the micro-motion sensing optical fiber measures or monitors information which is distributed along the space of an optical fiber transmission path and changes along time by adopting a unique distributed optical fiber detection technology; when the waterproof curtain has a leakage point, water on the outer side of the waterproof curtain flows to the leakage point, so that micro pressure is applied to the optical fiber, the transmission characteristic of light in the optical fiber is changed, micro pressure field signals are obtained by analyzing different parts of different optical fibers, and the position of the leakage point and the severity of leakage are presumed according to the intensity distribution of the pressure field.

Further, the optical time domain reflectometer is connected with a data terminal 4, and the data terminal 4 comprehensively analyzes the capacitance value and the strain value obtained by the composite wet pressure sensor 2 and the micro-motion pressure field signal detected by the micro-motion sensing optical fiber, which are obtained simultaneously, so as to position the position of the leakage point and evaluate the leakage strength.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.