阅读说明：本技术 一种模块化基坑工程漏水漏砂引发地层运移的试验装置 (Test device for stratum migration caused by water leakage and sand leakage of modular foundation pit engineering ) 是由 戴轩 刘郑 王岩梓 于 2021-02-23 设计创作，主要内容包括：一种模块化基坑工程漏水漏砂引发地层运移的试验装置。其包括地下水补给水箱、补水接头、水位控制球阀、排水阀门、基坑土体试验箱、漏点控制通道、水砂防护导流装置、底部框架、脚轮、内卡式传感器支架、激光位移传感器、模块连接板、连接螺栓、水砂量自动测量装置、漏点封堵塞和止水密封条；本发明效果：兼具地下水位控制、改变漏点位置、渗漏控制、水土分离、自动测量、可视化试验、模块化组装的综合功能,可满足定性和定量分析基坑工程漏水漏砂各阶段的灾害发生发展机理和参数变化规律,从而为基坑工程施工中漏水漏砂灾害的预防和治理提供理论依据。(A test device for stratum migration caused by water and sand leakage in modular foundation pit engineering is disclosed. The device comprises an underground water replenishing water tank, a water replenishing joint, a water level control ball valve, a drainage valve, a foundation pit soil body test box, a leak source control channel, a water sand protection flow guide device, a bottom frame, trundles, an inner clamping type sensor bracket, a laser displacement sensor, a module connecting plate, connecting bolts, an automatic water sand amount measuring device, a leak source sealing plug and a water stopping sealing strip; the invention has the following effects: the system has the comprehensive functions of underground water level control, leakage point position change, leakage control, water-soil separation, automatic measurement, visual test and modular assembly, and can meet the requirements of qualitative and quantitative analysis of the disaster occurrence and development mechanism and parameter change rule of each stage of water and sand leakage in foundation pit engineering, thereby providing a theoretical basis for prevention and treatment of water and sand leakage disasters in foundation pit engineering construction.)

1. The utility model provides a test device that modularization foundation ditch engineering leaks water and leaks sand and causes stratum migration which characterized in that: modularization foundation ditch engineering leak water and leak sand and initiate test device of stratum migration include: the device comprises a groundwater make-up water tank (1), a make-up water joint (2), a water level control ball valve (3), a drainage valve (4), a foundation pit soil test box (5), a leak source control channel (8), a water sand protection flow guide device (9), a bottom frame (10), a caster (12), an inner clamping type sensor support (13), a laser displacement sensor (14), a module connecting plate (15), a connecting bolt (16), a water sand amount automatic measuring device (17), a leak source sealing plug (18) and a water stop sealing strip (19); the upper end of the foundation pit soil body test box (5) is open, two adjacent side faces are made of full-hole fine steel plates (6), and the other two side faces are made of transparent and visible polycarbonate plates (7); the plane of the groundwater make-up water tank (1) is L-shaped, the L-shaped side surface positioned at the inner side is open, and the opening is blocked by a full-hole fine steel plate (6) on a foundation pit soil body test box (5); the foundation pit soil body test box (5) and the underground water replenishing tank (1) are mutually connected by a module connecting plate (15) and a connecting bolt (16) which are arranged at the edge of a connecting area, and the interface of the side surface and the edge of the lower end is sealed by a water-stopping sealing strip (19); the lower parts of the foundation pit soil body test box (5) and the underground water replenishing water tank (1) are respectively provided with a bottom frame (10); the bottom surface corner of the bottom frame (10) is provided with a caster (12); a plurality of leak source control channels (8) are formed at the outer corner of the foundation pit soil body test box (5) along the vertical direction; a leakage point sealing plug (18) is arranged in each leakage point control channel (8); the water sand protection and flow guide device (9) is arranged on the outer side surface of the foundation pit soil body test box (5) positioned outside the leak point control channel (8); the automatic water sand amount measuring device (17) is arranged on the ground below the discharge port of the water sand protection flow guide device (9); the inner clamping type sensor bracket (13) is in a door shape, and the two lower ends are respectively arranged at the tops of two opposite side surfaces on the foundation pit soil body test box (5) in a moving mode; a plurality of laser displacement sensors (14) are arranged on a cross beam of the inner clamping type sensor bracket (13) at intervals; the bottom parts of the underground water replenishing water tank (1) and the foundation pit soil body test box (5) are respectively provided with a drainage valve (4); the water replenishing joint (2) is arranged on the side surface of the underground water replenishing tank (1); the water level control ball valve (3) is installed at the bottom of the water replenishing connector (2) and used for automatically controlling the opening and closing of the water replenishing connector (2).

2. The test device for testing stratum migration caused by water and sand leakage in modular foundation pit engineering according to claim 1, characterized in that: and a plurality of groups of water replenishing joints (2) and water level control ball valves (3) are arranged on the side surface of the underground water replenishing tank (1) along the vertical direction so as to control different test water levels.

3. The test device for testing stratum migration caused by water and sand leakage in modular foundation pit engineering according to claim 1, characterized in that: the water sand protection and flow guide device (9) is made of organic glass and consists of a front side splash-proof baffle and a lower inclined flow guide groove.

Technical Field

The invention belongs to the technical field of geotechnical engineering tests, and particularly relates to a test device for stratum migration caused by water leakage and sand leakage of modular foundation pit engineering.

Background

Along with the progress of society, the development of countries and the continuous promotion of urbanization process in recent years, the construction of various large-scale buildings and underground engineering is more and more, and the scale is larger and larger. The construction of underground engineering and large building underground structure is to dig deep foundation pit in the stratum, and with the development of underground engineering, the excavation of foundation pit also develops towards the deep, big and long directions. For foundation pit engineering construction in a water-rich sand layer, road surface collapse accidents caused by water leakage and sand leakage are frequent, road surface cracking is caused to influence traffic, casualties are caused to form major safety accidents. In order to ensure the safety of deep foundation pit engineering construction, the test research is carried out on the stratum migration rule and mechanism caused by water leakage and sand leakage of the foundation pit, and the analysis of the migration characteristics of different soil bodies along with underground water becomes more important. For an actual soil body, the development process of water leakage and sand leakage can be simulated through a test means, the flowing rule and the influence range of the soil body are obtained, engineering disasters are analyzed according to parameters obtained through the test, and reference basis can be provided for disaster evaluation and early warning. With the continuous development of cracks and subsidence, the building enclosure structure is subjected to the process of disaster evolution such as water leakage, soil particle erosion, water leakage and sand leakage, the mutual influence and the internal rule of factors such as water leakage degree, soil body erosion degree and sand leakage quality can be researched through a model test, and a theoretical basis is provided for the construction safety control of underground engineering.

The existing water leakage and sand leakage test method and equipment aim at foundation pit engineering and cannot reasonably simulate groundwater supply in a far field, and meanwhile, the test equipment also meets the requirement of test expansibility in different scales, so that a set of modularized test device for simulating stratum migration caused by water leakage and sand leakage in foundation pit engineering is urgently needed.

Disclosure of Invention

In order to solve the problems, the invention aims to provide a test device for stratum migration caused by water and sand leakage in a modular foundation pit engineering.

In order to achieve the aim, the test device for stratum migration caused by water and sand leakage of the modular foundation pit engineering provided by the invention comprises an underground water replenishing water tank, a water replenishing joint, a water level control ball valve, a drainage valve, a foundation pit soil body test box, a leakage point control channel, a water and sand protection flow guide device, a bottom frame, trundles, an inner clamping type sensor support, a laser displacement sensor, a module connecting plate, connecting bolts, an automatic water and sand amount measuring device, a leakage point sealing plug and a water-stopping sealing strip; the upper end of the foundation pit soil body test box is open, two adjacent side surfaces are made of full-hole fine-mesh steel plates, and the other two side surfaces are made of transparent and visible polycarbonate plates; the plane of the groundwater make-up water tank is L-shaped, the L-shaped side surface positioned at the inner side is open, and the opening is blocked by a full-hole fine steel plate on the foundation pit soil body test box; the foundation pit soil body test box and the underground water replenishing water box are mutually connected by using a module connecting plate and a connecting bolt which are arranged at the edge of a connecting area, and the interface of the side surface and the edge of the lower end is sealed by using a water stopping sealing strip; the lower parts of the foundation pit soil body test box and the underground water replenishing water tank are respectively provided with a bottom frame; the bottom surface corner of the bottom frame is provided with a caster; a plurality of leak source control channels are formed at the outer corner of the foundation pit soil body test box along the vertical direction; each leakage point control channel is internally provided with a leakage point seal plug; the water sand protection and flow guide device is arranged on the outer side surface of a foundation pit soil body test box positioned on the outer side of the leak point control channel; the automatic water sand amount measuring device is arranged on the ground below the water sand protection flow guide device outlet; the inner clamping type sensor bracket is in a door shape, and the two lower ends of the inner clamping type sensor bracket are respectively arranged at the tops of two opposite side surfaces on the foundation pit soil body test box in a moving mode; a plurality of laser displacement sensors are arranged on a cross beam of the inner clamping type sensor bracket at intervals; the bottom of the underground water make-up water tank and the bottom of the foundation pit soil body test box are respectively provided with a drainage valve; the water replenishing joint is arranged on the side surface of the underground water replenishing tank; the water level control ball valve is installed at the bottom of the water replenishing connector and used for automatically controlling the opening and closing of the water replenishing connector.

And a plurality of groups of water replenishing joints and water level control ball valves are arranged on the side surface of the underground water replenishing tank along the vertical direction so as to control different test water levels.

The water sand protection and flow guide device is made of organic glass and consists of a front side splash-proof baffle and a lower inclined flow guide groove.

The invention has the advantages and positive effects that: when the test underground water level exceeds the water level control ball valve, the water supplementing joint automatically stops supplementing water, and when the water level in the underground water supplementing water tank is lower than the water level control ball valve, the water supplementing joint is automatically opened, so that underground water supplementation can be truly simulated, and a stable hydraulic boundary condition is formed; different water level control ball valves with different heights are opened, so that different underground water levels can be simulated; the full-hole fine steel plate can fully supplement underground water and cannot cause soil loss; the water sand protection and flow guide device made of organic glass does not influence the acquisition of test images, and can also achieve the purpose of preventing water sand from splashing and guiding; the leakage point control channel and the leakage point plugging plug can change the position of the leakage point for testing, and can actively control the occurrence and stop of leakage; the module connecting plate, the connecting bolt and the water stop sealing strip are reasonably designed, so that the sand box and the water tank can be respectively tested or combined according to needs, and meanwhile, a plurality of testing devices can be assembled to expand the test scale. The test device has the comprehensive functions of underground water level control, leakage point position change, leakage control, water-soil separation, automatic measurement, visual test and modular assembly, and can meet the requirements of qualitative and quantitative analysis of disaster occurrence and development mechanisms and parameter change rules of foundation pit engineering water and sand leakage stages.

Drawings

FIG. 1 is a perspective view of a test device for testing stratum migration caused by water and sand leakage in a modular foundation pit project, provided by the invention;

FIG. 2 is a left side view of a test device for testing stratum migration caused by water and sand leakage in the modular foundation pit engineering provided by the invention;

FIG. 3 is a top view of a test device for formation migration caused by water and sand leakage in the modular foundation pit engineering provided by the invention;

Detailed Description

For a further understanding of the contents, features and effects of the present invention, reference is made to the following examples, which are set forth in the accompanying drawings and the following detailed description:

as shown in fig. 1-3, the test device for stratum migration caused by water and sand leakage in the modular foundation pit engineering provided by the invention comprises a groundwater make-up water tank 1, a make-up water joint 2, a water level control ball valve 3, a drainage valve 4, a foundation pit soil body test box 5, a leak source control channel 8, a water and sand protection and flow guide device 9, a bottom frame 10, a caster 12, an internally-clamped sensor support 13, a laser displacement sensor 14, a module connecting plate 15, a connecting bolt 16, an automatic water and sand amount measuring device 17, a leak source sealing plug 18 and a water-stop sealing strip 19; the upper end of the foundation pit soil body test box 5 is open, two adjacent side faces are made of full-hole fine steel plates 6, and the other two side faces are made of transparent and visible polycarbonate plates 7; the plane of the groundwater make-up water tank 1 is L-shaped, the L-shaped side surface positioned at the inner side is open, and the opening is blocked by a full-hole fine steel plate 6 on a foundation pit soil body test box 5; the foundation pit soil body test box 5 and the underground water make-up water tank 1 are mutually connected by a module connecting plate 15 and a connecting bolt 16 which are arranged at the edge of a connecting area, and the interface of the side surface and the lower end edge is sealed by a water-stop sealing strip 19; the lower parts of the foundation pit soil body test box 5 and the underground water make-up water tank 1 are respectively provided with a bottom frame 10; the bottom surface corner of the bottom frame 10 is provided with a caster 12; a plurality of leak source control channels 8 are formed at the outer corner of the foundation pit soil body test box 5 along the vertical direction; a leakage point sealing plug 18 is arranged in each leakage point control channel 8; the water sand protection and flow guide device 9 is arranged on the outer side surface of the foundation pit soil body test box 5 positioned outside the leak point control channel 8; the automatic water sand amount measuring device 17 is arranged on the ground below the discharge port of the water sand protection flow guide device 9; the inner clamping type sensor bracket 13 is in a door shape, and the two lower ends are respectively arranged at the tops of two opposite side surfaces on the foundation pit soil body test box 5 in a moving mode; a plurality of laser displacement sensors 14 are arranged on a cross beam of the inner clamping type sensor bracket 13 at intervals; the bottom parts of the underground water make-up water tank 1 and the foundation pit soil body test box 5 are respectively provided with a drainage valve 4; the water replenishing joint 2 is arranged on the side surface of the underground water replenishing tank 1; the water level control ball valve 3 is installed at the bottom of the water replenishing connector 2 and used for automatically controlling the opening and closing of the water replenishing connector 2.

And a plurality of groups of water replenishing joints 2 and water level control ball valves 3 are arranged on the side surface of the underground water replenishing tank 1 along the vertical direction so as to control different test water levels.

The water sand protection and flow guide device 9 is made of organic glass and consists of a front side splash-proof baffle and a lower inclined flow guide groove.

The concrete using process of the test device for the formation migration caused by the water leakage and sand leakage of the modular foundation pit engineering provided by the invention is described by taking a visual model test for the soil migration caused by the water leakage and sand leakage of the foundation pit engineering at a certain leakage point as an example, and the concrete implementation method is as follows:

(1) ensuring that foreign matters do not exist in the groundwater make-up water tank 1 and the foundation pit soil body test box 5 on the device, enabling each leak source sealing plug 18 to be in a closed state, then mutually connecting one or more groundwater make-up water tanks 1 and the foundation pit soil body test box 5 by using a module connecting plate 15 and a connecting bolt 16 which are arranged at the edge of a connecting area according to the test scale, and sealing the interface of the side surface and the lower end edge by using a water-stop sealing strip 19;

(2) filling required sand into the foundation pit soil body test box 5, filling and tamping in layers according to calculation, ensuring the soil surface to be horizontal, and paving markers on the inner side surface of the polycarbonate plate 7 corresponding to the positions of each filling layer until the required height is reached by filling;

(3) closing the drainage valve 4, connecting and opening the water replenishing joint 2 at the same filling height with a water supply pipe, and supplying water into the groundwater replenishing water tank 1;

(4) continuously percolating water in the groundwater make-up water tank 1 into a foundation pit soil body test box 5 through a full-hole fine-mesh steel plate 6, automatically stopping water supply when the water level in the groundwater make-up water tank 1 rises to a water level control ball valve 3 on a water supply make-up joint 2, and standing for 24 hours until the soil body is fully saturated;

(5) moving the inner clamping type sensor bracket 13 to a specific position, connecting the laser displacement sensor 14 with an upper computer, then utilizing the laser displacement sensor 14 to emit laser downwards and collect surface deformation data, and simultaneously starting the automatic water sand quality measuring device 17;

(6) according to the position of the leakage point, slowly opening the leakage point sealing plug 18 at the position to open the corresponding leakage point control channel 8, wherein at the moment, the water-sand mixture in the foundation pit soil test box 5 continuously runs off outwards through the leakage point control channel 8 and flows into the water-sand quality automatic measuring device 17 through the water-sand protection flow guide device 9, the laser displacement sensor 14 is continuously used for measuring the deformation data of the soil surface in real time, the water-sand quality automatic measuring device 17 is used for measuring the running-off quality in real time, and a dynamic video recorder is used for carrying out image acquisition through the transparent polycarbonate plate 7; in the process, once the water level in the groundwater make-up water tank 1 is lowered to be lower than the water level control ball valve 3 on the water make-up joint 2 for supplying water, water is automatically supplemented;

(7) after the surface of the earth is obviously collapsed and the earth is damaged, slowly closing the leakage point seal plug 18 and stopping the test;

(8) stopping supplying water after the soil in the foundation pit soil test box 5 is deformed stably, opening the drainage valve 4, draining the water in the groundwater make-up water tank 1 and the foundation pit soil test box 5, and then removing the soil in the foundation pit soil test box 5;

(9) and changing the position of the leakage point control channel 8, the opening position of the water replenishing joint 2 and the soil filling height, and repeating the test process.