阅读说明：本技术 一种模拟盾构富水地层同步注浆施工技术室内试验装置及其使用方法 (Indoor test device for simulating shield water-rich stratum synchronous grouting construction technology and using method thereof ) 是由 宋洋 肖作明 苑强 王鑫 万金宝 李昂 徐筱锋 葛振雨 于 2021-08-31 设计创作，主要内容包括：本发明公开了一种模拟盾构富水地层同步注浆施工技术室内试验装置及其使用方法,将模拟盾构系统插入装有相似土且连接动水系统的模型箱中,研究水流速度和水压对注浆的影响,使试验能够更接近实际地层需求。通过动力系统收缩千斤顶将模拟盾壳拔出,其管片衬砌固定,进而形成盾尾间隙,浆液通过环流系统从注浆孔喷出,填充盾尾间隙,研究不同浆液材料及配比、注浆压力、注浆量和盾构机掘进速度等施工参数对隧道管片衬砌结构受力及地层变形的影响机理。此外,本发明能够实现单、双浆液注浆,可分别控制每个注浆孔的注浆压力和注浆量,从而研究每个注浆孔采用相同以及不同注浆压力和注浆量对地层变形的影响以及注浆孔数量和分布对地层的影响规律。(The invention discloses an indoor test device for simulating a shield water-rich stratum synchronous grouting construction technology and a using method thereof. The simulated shield shell is pulled out through a power system shrinkage jack, the segment lining of the simulated shield shell is fixed, a shield tail gap is further formed, slurry is sprayed out from a grouting hole through a circulation system to fill the shield tail gap, and the influence mechanism of construction parameters such as different slurry materials, proportion, grouting pressure, grouting amount, shield tunneling speed and the like on the stress of a tunnel segment lining structure and stratum deformation is researched. In addition, the invention can realize single-slurry grouting and double-slurry grouting, and can respectively control the grouting pressure and the grouting amount of each grouting hole, thereby researching the influence of the same or different grouting pressures and grouting amounts adopted by each grouting hole on the formation deformation and the influence rule of the number and distribution of the grouting holes on the formation.)

1. The utility model provides a simulation shield constructs synchronous slip casting construction technology indoor test device in rich water stratum which characterized in that: the device comprises a flowing water simulation system, a model soil box, a shield system, a power system, an automatic monitoring system and a test bed, wherein the size of the test device depends on the size of a tunnel, follows similar test cylinders and is obtained by reducing according to a similar proportion.

2. The indoor test device for simulating the shield water-rich stratum synchronous grouting construction technology according to claim 1, characterized in that: the model soil box is a rectangular iron box with an upper end opening and a circular hole reserved in the center of one side, 18 water injection holes are evenly distributed in one side of the circular hole reserved in the iron box, a water stop valve is arranged in each water injection hole, and the water injection holes are connected with the moving water simulation system through pipelines to realize the shield tail grouting technology under the condition of simulating moving water.

3. The indoor test device for simulating the shield water-rich stratum synchronous grouting construction technology according to claim 1, characterized in that: the flowing water simulation system consists of an air compressor, a water tank, a flowmeter and a pressure sensor, is connected with the side surface of the mold box, and has a water flow direction parallel to the grouting system and the duct piece system; the flow speed and the water pressure of the flowing water are adjusted by adjusting the pressure of the air compressor.

4. The indoor test device for simulating the shield water-rich stratum synchronous grouting construction technology according to claim 1, characterized in that: the shield system can be divided into a simulation shield machine shield shell, a grouting circulation system and a simulation shield machine pipe sheet lining; the shield shell of the simulation shield machine is a cylindrical barrel surrounded by galvanized iron sheets; the simulation shield constructs quick-witted section of jurisdiction lining and comprises transparent PVC pipe, receives the effect of slip casting pressure for better simulation section of jurisdiction, produces and warp, makes the recess according to section of jurisdiction size (length similarity is than confirming), and need encircle to the trompil at PVC pipe, lays the sensor.

5. The grouting circulation system of claim 4 consisting of grouting holes, grouting pipes, a grout cylinder A, a grout cylinder B, a flow meter, a pressure gauge, a water stop valve and a grouting pump A, B; 2 grouting holes are respectively fixed at the upper, lower, left and right positions on the inner side of the shield shell of the simulation shield machine, and two grouting modes of single grout and double grout can be respectively simulated; the 2 grouting holes at each position are respectively connected with the slurry cylinder A, B through grouting pipelines; the slurry cylinders A, B are respectively connected with a grouting pump A, B; the slurry cylinder A, B is respectively used for placing liquid A cement mortar and liquid B water glass; each grouting pipeline is connected with a set of water stop valve, a flowmeter and a pressure gauge, so that grouting pressure and grouting amount are controlled.

6. The indoor test device for simulating the shield water-rich stratum synchronous grouting construction technology according to claim 1, characterized in that: the power system consists of a hydraulic oil cylinder, a hand pump and a jack; the pressure generated by pressing the hand pump on the hydraulic oil cylinder acts on the jack, so that the jack is contracted; the jack is connected with the shield shell of the simulation shield tunneling machine, the shield shell can move due to the shrinkage of the jack, and the process that the shield tunneling machine moves and grouting is carried out can be effectively simulated.

7. The indoor test device for simulating the shield water-rich stratum synchronous grouting construction technology according to claim 1, characterized in that: the test bed is formed by welding angle steel, and a hand pump, a hydraulic oil cylinder and a jack in the power system, the fixed support, a water tank in the flowing water simulation system and a slurry cylinder in the grouting system are distributed; the test bed adjusts the height through a lifting screw, ensures that a power system and a fixed support, a simulation shield machine shield shell and a simulation shield machine segment lining are on the same axis, and ensures that a model shield keeps a horizontal state.

8. The indoor test device for simulating the shield water-rich stratum synchronous grouting construction technology according to claim 1, characterized in that: the automatic monitoring system consists of a Donghua data acquisition instrument, a stress strain sensor, a pore water pressure sensor, a displacement sensor, a pressure sensor and a computer; the monitoring system is positioned in the model box, the stress strain sensor and the partial pressure sensor are arranged on the outer side of the lining segment through the hole of the simulation shield tunneling machine segment lining system, the pore water pressure sensor and the partial pressure sensor are arranged in the soil layer around the shield tunneling segment, and the displacement sensor is arranged on the surface of the soil layer.

9. A simulated synchronous grouting construction method by using the indoor test device for simulating the synchronous grouting construction technology of the shield water-rich stratum of claim 1, the method comprises the following steps:

(1) configuring required model soil, arranging a measuring device and a shield system in place in advance according to test design requirements, tamping a soil body layer by layer to an appointed strength, fixing a displacement sensor through a support, and adjusting the heights of the displacement sensor and a test bench through a lifting screw;

(2) placing water in a water tank, and adjusting the flowing water flow rate and the water pressure to design values by adjusting an air compressor; placing the prepared slurry into a slurry barrel, driving the simulation shield shell to advance at a set reasonable speed through a power system, and grouting into a grouting pipeline through a grouting system according to set reasonable grouting pressure and grouting quantity so as to enable the slurry to flow out of a grouting hole and fill a shield tail gap generated by advancing of the simulation shield shell;

(3) collecting data before and after the test soil body is deformed by a monitoring system, and analyzing the deformation condition of the test soil body; meanwhile, the stress-strain change and the pressure change of the duct piece are collected, and reasonable grouting parameters are analyzed.

Technical Field

The invention relates to the technical field of model tests for synchronous grouting collar of underground geotechnical engineering, in particular to an indoor test device for simulating synchronous grouting construction technology of a shield tunneling machine and a using method thereof.

Background

With the continuous improvement of national economic level, the tunnel and underground engineering in China are developed rapidly, and the shield method is widely applied to the construction of the underground engineering with excellent construction precision and less influence on the surrounding environment; in the shield construction process, synchronous grouting is used as a key construction process, and plays an important role in preventing stratum deformation, improving the tunnel impermeability, improving the tunnel lining stability, improving the joint stress of lining-slurry-stratum and the like.

At present, aiming at shield construction, in an indoor model test research about development of a synchronous grouting technology in a construction process, due to the influence of various factors such as complexity of stratum, uncertainty of parameters such as shield tail clearance and grouting pressure, variability of grouting materials and mixing ratio, concealment of filling effect, uncertainty of grouting effect and the like, the related theoretical research of synchronous grouting of a shield tunnel cannot meet engineering practice requirements, and the influence of a synchronous grouting excavation process on the surrounding environment and evaluation of grouting effect under a complex water environment which are difficult to accurately reflect are difficult to control.

Disclosure of Invention

The invention provides an indoor analog simulation test device for simulating a shield water-rich stratum synchronous grouting construction technology and a use method thereof.

In order to solve the problems, the invention adopts the following technical scheme aiming at the defects of the prior art: the invention provides an indoor analog simulation test device for simulating a shield water-rich stratum synchronous grouting construction technology, which mainly comprises a water moving simulation system, a model soil box, a shield system, a power system, an automatic monitoring system and a test bed.

Furthermore, the sizes of the test devices are all obtained by depending on the size of the tunnel and following similar test principles and reducing the sizes according to similar proportions.

The model soil box is a rectangular iron box with an opening at the upper end and a circular hole reserved in the center of one side, and the iron box is formed by welding steel plates and is fixed through angle steel; 18 water injection holes are evenly distributed on one side of the reserved circular hole of the iron box, water stop valves are installed on the water injection holes, and the moving water simulation system is connected with the moving water simulation system through pipelines, so that the shield tail grouting technology under the condition of simulating moving water is realized.

The flowing water simulation system consists of an air compressor, a water tank, a flowmeter and a pressure gauge, is connected with a water stop valve on the side surface of the mold box, and has a water flow direction parallel to the grouting system and the duct piece system; the air compressor machine pressure and stagnant water valve and then adjust the flowing water velocity of flow and water pressure can be adjusted to the accessible, realize synchronous slip casting simulation under different water pressure and the velocity of flow condition, flowmeter and pressure sensor can carry out real-time supervision to water pressure and velocity of flow.

The shield system can be divided into a simulation shield machine shield shell, a grouting circulation system and a simulation shield machine pipe sheet lining system.

Furthermore, the simulation shield machine shield shell is a cylindrical cylinder surrounded by galvanized iron sheets, so that the dead weight of the shield machine reduced by the similarity ratio can be effectively simulated, and the underground water is prevented from being corroded.

Further, the grouting circulation system consists of a grouting hole, a grouting pipeline, a grout cylinder A, a grout cylinder B, a flowmeter, a pressure gauge, a water stop valve and a grouting pump A, B; and 2 grouting holes are respectively fixed at the upper, lower, left and right positions on the inner side of the shield shell of the simulation shield machine, so that two grouting modes of single grout and double grout can be simulated respectively.

Further, the 2 grouting holes at each position are respectively connected with the slurry cylinder A, B through grouting pipelines; the slurry cylinder A, B is used for placing various slurries required by tests such as cement mortar or A liquid cement mortar and B liquid water glass.

Further, the slurry cylinders A, B are respectively connected to a grouting pump A, B.

Furthermore, every slip casting pipeline all connects one set of stagnant water valve, flowmeter and pressure gauge, through with the cooperation of grouting pump A, B, realizes the monitoring control to every slip casting pipeline slip casting pressure and slip casting volume.

Furthermore, simulation shield constructs quick-witted section of jurisdiction lining system and comprises transparent PVC pipe, receives the effect of slip casting pressure for better simulation section of jurisdiction, produces and warp, makes the recess according to section of jurisdiction size (confirm by geometric similarity ratio), and need lay the sensor at PVC pipe ring direction trompil.

Furthermore, an annular space is reserved between the shield shell of the simulation shield tunneling machine and the pipe piece lining system of the simulation shield tunneling machine, and a shield tail gap can be effectively formed; the grouting pipeline penetrates through the annular space and is connected with a grouting hole fixed on a shield shell of the simulation shield machine; and applying pressure to the grout in the grouting barrel through a grouting pump, enabling the grout to flow through the grouting pipeline and flow out through the grouting holes, and finally filling the gap at the tail of the shield to finish the filling and permeation of the grout in the soil.

Further, be equipped with annular iron stand and water inflation rubber circle in the annular space, annular iron stand and water inflation rubber circle are fixed simulation shield constructs quick-witted shield shell shield tail department, meet the gap between water rubber circle sealing shield tail and the simulation shield and construct quick-witted pipe lining, prevent inside groundwater and thick liquid inflow simulation shield and construct the machine, influence experimental effect.

Furthermore, the simulated shield tunneling machine segment lining system is fixed in the model box through a fixed support on the test bed.

The power system consists of a hydraulic oil cylinder, a hand pump and a jack.

The propulsion system generates pressure to the hydraulic oil cylinder by pressing the hand pump to act on the jack, so that the jack is contracted; the jack is connected with the shield shell of the simulation shield tunneling machine, the shield shell can move due to the shrinkage of the jack, and the process that the shield tunneling machine moves and grouting is carried out can be effectively simulated.

The test bed is formed by welding angle steel, and a hand pump, a hydraulic oil cylinder and a jack in the power system, the fixed support, the water tank in the flowing water simulation system and the slurry cylinder in the grouting system are distributed.

Furthermore, the height of the test bed is adjusted through a lifting screw, so that the power system, the fixed support, the simulation shield tunneling machine shield shell and the simulation shield tunneling machine segment lining system are ensured to be in the same axis, and the model shield is ensured to be kept in a horizontal state.

The automatic monitoring system consists of a Donghua data acquisition instrument, a stress strain sensor, a pore water pressure sensor, a displacement sensor, a pressure sensor and a computer.

Furthermore, the monitoring system is positioned in the model box, the stress strain sensor and the partial pressure sensor are arranged on the outer side of the lining segment through the hole of the segment lining system, the pore water pressure sensor and the partial pressure sensor are arranged in the soil layer around the shield segment, and the displacement sensor is arranged on the surface of the soil layer.

A method for simulating synchronous grouting construction by an indoor test device for simulating synchronous grouting construction technology of a shield water-rich stratum comprises the following steps:

(1) configuring required model soil, arranging a measuring device and a shield system in place in advance according to test design requirements, tamping a soil body layer by layer to an appointed strength, fixing a displacement sensor through a support, and adjusting the heights of the displacement sensor and a test bench through a lifting screw;

(2) the water is placed in a water tank, and the flowing water flow rate and the water pressure are adjusted to the designed values by adjusting an air compressor. Placing the prepared slurry into a slurry barrel, driving the simulation shield shell to advance at a set reasonable speed through a power system, and grouting into a grouting pipeline through a grouting system according to set reasonable grouting pressure and grouting quantity so as to enable the slurry to flow out of a grouting hole and fill a shield tail gap generated by advancing of the simulation shield shell;

(3) data before and after the test soil body is deformed are collected through a monitoring system, the deformation condition of the test soil body is analyzed, meanwhile, stress-strain change and pressure change of the pipe piece are collected, and reasonable grouting parameters are analyzed.

The working principle of the model test device is introduced as follows: the power system enables the simulation shield tail to be pulled out (moved leftwards) of the model soil box through the contraction of the jack, the simulation pipe piece is fixed, in the process that the simulation shield tail pulls out the model soil box, the grouting system conducts grouting into the annular space through the grouting pipeline, and then each sensor conducts corresponding data monitoring.

The invention has the beneficial effects that: the invention relates to an indoor test device for simulating a shield water-rich stratum synchronous grouting construction technology and a using method thereof, wherein the test device can simulate a grouting process and monitor the grouting process; the jack is driven to contract by applying pressure through a hand pump in a power system, the segment lining system is fixed in the model box through a fixed support on the test bed and is fixed, the shield shell is pulled out of the soil box, the movement of the simulation shield machine is realized, an annular space simulation shield tail gap is formed, and the influence on synchronous grouting under the condition of considering soil stress release is researched; controlling the moving speed of the shield tail by adjusting the contraction speed of the jack; the shield tail is provided with an annular iron frame and a water-swelling rubber ring, so that slurry and underground water are prevented from entering the inner space of the shield tail, and the influence on the shield tail is avoided; the flowing water simulation system can simulate the influence of underground water seepage on the diffusion of synchronous grouting slurry by adding a certain volume of water into the water tank and regulating the pressure test of the air compressor to simulate the flow of underground water; the invention can not only study the grouting parameters of different stratums, different grouting hole numbers and distribution, grouting amount and the like, and the influence of the same and different grouting amount, grouting pressure and the like of each grouting hole on the diffusion and permeation rules of synchronous grouting slurry and pipe pieces, but also simulate the diffusion and permeation rules of underground water seepage on synchronous grouting.

Drawings

FIG. 1 is a schematic view of the structure of the model test apparatus;

FIG. 2 is a side view of the mold box;

FIG. 3 is a diagram of a simulated shield machine main view;

FIG. 4 simulates a side view of a shield machine;

FIG. 5 is a sensor ring distribution diagram;

FIG. 6 is a longitudinal profile of the sensor;

in the figure: the device comprises a model soil box 1, a simulation shield tunneling machine shield shell 2, a simulation shield tunneling machine segment lining 3, a fixing support 4, a jack 5, an oil cylinder 6, a hand pump 7, a water tank 8, a grouting cylinder A9, a grouting cylinder B10, an air compressor 11, a grouting pump 12, a flowmeter 13, a pressure gauge 14, a water stop valve 15, a test bed 16, a lifting screw 17, a displacement sensor 18, a soil pressure sensor 19, a pore water pressure sensor 20, a stress strain sensor 21, a A, B grouting hole 22, an annular iron frame, a water-meeting rubber ring 23 and a sensor arrangement point 24.

Detailed Description

The technical solutions of the present invention are described in detail below by way of examples, and the following embodiments are only exemplary, and can be used only for explaining and illustrating the technical solutions of the present invention, and are not to be construed as limiting the technical solutions of the present invention.

As shown in the figure, the indoor test device for simulating the shield water-rich stratum synchronous grouting technology mainly comprises a model box 1, a test bed 16, a shield system, a flowing water simulation system, a power system and an automatic monitoring system; the flowing water simulation system consists of a water tank 8, an air compressor 11, a flow meter 13 and a pressure gauge 14; the power system consists of a jack 4, a jack 5, an oil cylinder 6 and a hand pump 7; the automatic monitoring system consists of a displacement sensor 17, a displacement sensor 18, a soil pressure sensor 19, a pore water pressure sensor 20 and a stress strain sensor 21; the shield system comprises a simulation shield machine shield shell 2, a simulation shield machine segment lining 3, a fixed support 4, a grouting cylinder A9, a grouting cylinder B10, a grouting pump 12, a flowmeter 13, a pressure gauge 14, an annular iron frame and a water-encountering rubber ring 23. The model box is manufactured according to experimental design, water filling ports are evenly distributed, and water stop valves 15 are installed at the water filling ports.

The flowing water simulation system is connected with a stop water valve 15 on the model box through a pipeline through a multi-way flow valve; water with a certain volume is injected into the water tank 8, the flow rate of the water and the pressure of the water are adjusted properly according to the combination of the flow meter 13 and the pressure gauge 14 and the actual construction by changing the pressure of the air compressor, so that the process of simulating the flowing and the infiltration of the underground water can be realized, and the influence of the seepage effect of the underground water and the diffusion of the synchronous grouting slurry caused by different water flow rates and water pressures can be researched.

A shield shell of a simulation shield machine in the shield system is connected with the power system, a hand pump 7 in the power system applies pressure to drive a jack 5 to contract, a pipe piece lining 3 of the simulation shield machine passes through a fixed support 4 on a test bed 16 and is fixed in a model box 1 without movement, the shield shell 2 of the simulation shield machine is pulled out of a soil box, the movement of the simulation shield machine is realized, an annular space simulation shield tail gap is formed, and the influence on synchronous grouting under the condition of considering soil stress release is researched; the moving speed of the shield tail is controlled by adjusting the contraction speed of the jack, and the influence rule of different tunneling speeds on slurry diffusion is researched.

The prepared grout A, B is respectively placed into a grouting cylinder A9 and a grouting cylinder B10, flows through a grouting pipeline through a grouting pump 12, respectively flows out of a A, B grouting hole 22, fills a simulated shield tail space, and completes filling and penetration of the grout; the influence of grouting parameters such as different grouting hole numbers and distribution, grouting amount, grouting pressure and the like on the synchronous grouting slurry diffusion and permeation rules and the internal force of the pipe piece structure can be researched, and the influence of the same and different grouting pressure and grouting amount of each grouting hole on the synchronous grouting and the internal force of the pipe structure can be further included but not limited.

The monitoring system is positioned in the model box, the stress strain sensor and the partial pressure sensor are arranged on the outer side of the lining segment through the hole for simulating the lining of the shield machine segment, the pore water pressure sensor and the partial pressure sensor are arranged in the soil layer around the shield segment, and the displacement sensor is arranged on the surface of the soil layer.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.