CN210797676U - Device for simulating overall process of foundation pit inrush disaster - Google Patents
Device for simulating overall process of foundation pit inrush disaster Download PDFInfo
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- CN210797676U CN210797676U CN201921347184.3U CN201921347184U CN210797676U CN 210797676 U CN210797676 U CN 210797676U CN 201921347184 U CN201921347184 U CN 201921347184U CN 210797676 U CN210797676 U CN 210797676U
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Abstract
The utility model discloses a device of simulation foundation ditch suddenly gushing catastrophe overall process for soft soil layer suddenly gushes catastrophe overall process under confined water topping and foundation ditch excavation uninstallation combined action when simulating foundation ditch excavation, the device mainly has five module to constitute, wherein includes test module, loading module, constant voltage module, pressurization module, measuring module. The utility model can automatically realize the whole process of excavation and inrush destruction of the foundation pit in the model test; in the test, the controllability adjustment of the bearing water level can be realized, the excavation speed of the foundation pit can be controlled automatically, and different working conditions can be simulated; the utility model discloses the technique is simple, realizes easily.
Description
Technical Field
The utility model relates to a geotechnical engineering tests technical field especially relates to a device of catastrophe overall process is suddenly gushed to simulation foundation ditch for soft soil layer suddenly gushes the catastrophe overall process under confined water topping and foundation ditch excavation uninstallation combined action when simulating the foundation ditch excavation.
Background
In recent years, with the continuous development of urban high-rise buildings and subway traffic, the depth and the width of a foundation pit are continuously increased. The excavation depth of the foundation pit approaches or reaches a confined aquifer. The impervious layer at the bottom of the foundation pit is raised and has a surging phenomenon under the action of the water pressure of the confined aquifer at the lower part of the impervious layer. If the sudden surge damage occurs in the foundation pit engineering, not only the building envelope collapses and the foundation pit is scrapped, but also the safety of the surrounding environment is endangered, and the loss of lives and properties of people is caused.
The above-mentioned catastrophic process is difficult to record on site, and the centrifuge model test becomes one of the most effective means for reproducing the above-mentioned catastrophic process. However, the existing model test can not automatically complete foundation pit excavation in the operation process of the centrifugal machine, and needs to stop the machine for manual excavation, so that the stress state of a soil body is greatly different from that in actual engineering, and the whole process of foundation pit inrush catastrophe cannot be completely and accurately simulated.
SUMMERY OF THE UTILITY MODEL
The utility model aims at filling the vacancy of prior art, provide a device of simulation foundation ditch suddenly gushing catastrophe overall process for soft soil layer suddenly gushes the catastrophe overall process under confined water topping and foundation ditch excavation uninstallation combined action when simulating the foundation ditch excavation.
The utility model aims at realizing through the following technical scheme: a device for simulating the whole process of sudden gushing and catastrophe of a foundation pit is used for simulating the whole process of sudden gushing and catastrophe under the combined action of jacking of a soft soil layer on confined water and unloading of foundation pit excavation during foundation pit excavation and comprises a test module, a loading module, a constant pressure module, a pressurizing module and a measuring module;
the test module comprises a model box, a large partition plate, a small partition plate and a water bag; the large partition plate is arranged in the model box and divides the model box into a left area and a right area, a simulated soil layer test block is filled in the right area, and an area is dug out on the left side of the simulated soil layer test block to serve as a simulated foundation pit; the small partition is inserted into the simulated foundation pit and is jacked on the simulated soil test block through the loading module to serve as a simulated foundation pit support; the water bag is placed in the simulated foundation pit, and after the water bag is filled with liquid, two sides of the water bag respectively abut against the large partition plate and the small partition plate for simulating foundation pit excavation;
the constant pressure module is introduced to the bottom of the simulated soil layer test block, the inside of the simulated foundation pit and the outside of the simulated foundation pit through pipelines, so that the pressure-bearing water level before the simulation test is started, the water level in the foundation pit and the water level outside the foundation pit are the same;
the pressurizing module is introduced to the bottom of the simulated soil layer test block through a pipeline and is used for simulating the upward jacking of the confined water;
the measuring module is used for obtaining the supporting pressure of the loading module, the vertical displacement value outside the foundation pit, the active soil pressure, the passive soil pressure, the pore pressure value in the simulated soil layer test block and the soil pressure value in the simulated soil layer test block.
Further, the loading module comprises a jack, a shaft rod and a bracket; the jack is fixed in the left area of the model box through the support, the large partition plate is provided with a hole for the shaft rod to pass through, and the jack props against the small partition plate through the shaft rod.
Furthermore, the simulated soil layer test block is formed by consolidating a sandy soil cushion layer and clay arranged on the upper part of the sandy soil cushion layer.
Furthermore, the water bag is filled with liquid, and the gravity of the liquid is the same as the specific gravity of the clay used in the test.
Further, before the test starts, the height of the liquid in the water bag is consistent with the height of the simulated soil layer test block on the right side of the small partition plate.
Further, the liquid is zinc chloride solution with a certain concentration, and the mass concentration range is 63% -68%.
Further, the constant pressure module comprises a constant pressure water tank, a first water inlet valve, a first water discharge valve, a second water discharge valve and a second water inlet valve; the constant-pressure water tank leads water in the water tank to the left simulation foundation pit of the small partition plate through a water inlet pipe, a first water inlet valve is arranged in the water inlet pipe, the water inlet pipe is also connected with a water outlet pipe, and a second water outlet valve is arranged on the water outlet pipe; the constant-pressure water tank leads the water in the water tank to a bottom sand layer of the simulated soil layer test block through a water inlet pipe, and a second water inlet valve is arranged in the water inlet pipe; the constant-pressure water tank leads water in the water tank to the top of the simulated soil layer test block on the right side of the small partition plate through a water inlet pipe; and a water inlet pipe provided with a first drainage valve penetrates through the large partition plate and is fixedly arranged at a water outlet at one side of the water bag through a flange plate.
Further, the constant voltage module still includes the iron box, and the iron box presss from both sides between simulation soil layer test block and mold box right side wall, and the iron box bottom has the water inlet, and the constant voltage water tank passes through the inlet tube and links to each other with the water inlet, and it has a play basin to open on the iron box lateral wall, goes out the basin and is located the top department of simulation soil layer test block.
Further, the pressurizing module comprises a pressurizing water tank and a third water inlet valve; the pressurized water tank leads the water in the water tank to the bottom sand layer of the simulated soil layer test block through a water inlet pipe, and a third water inlet valve is arranged in the water inlet pipe.
Further, the measuring module comprises a first displacement sensor for measuring the vertical displacement of the top of the simulated soil test block in the test process,
A second displacement sensor for measuring the horizontal displacement of the small partition plate in the test process,
A first pore pressure sensor for determining the water pressure at the bottom of the constant pressure water tank in the initial state,
A second pore pressure sensor for determining the water pressure at the bottom of the water tank when pressurizing the sand layer,
A third pore pressure sensor for determining the water pressure of the top surface of the simulated soil test block in the initial state,
A fourth pore pressure sensor arranged in the clay on the right side of the small partition plate, the height of the fourth pore pressure sensor is the same as that of the bottom of the small partition plate, and the fourth pore pressure sensor is used for measuring the pore pressure of the height outside the foundation pit,
The height of the clay is the same as the bottom of the small partition plate, and the clay is used for measuring the hole pressure of the height inside the foundation pit; a fifth pore pressure sensor,
A sixth hole pressure sensor for measuring the water pressure at the bottom in the water bag,
A first soil pressure sensor arranged in the clay at the left side of the small partition plate and having the same height as the bottom of the small partition plate and used for measuring the soil layer pressure at the height outside the foundation pit,
A second soil pressure sensor arranged on the contact surface of the small clapboard and the simulated soil layer test block and used for the soil layer pressure of the contact surface,
A third soil pressure sensor arranged on the left side surface of the small clapboard and used for the soil layer pressure on the left side surface,
And the axial force meter is arranged between the measuring jack and the shaft lever and is used for measuring the supporting pressure of the small partition plate.
The utility model has the advantages that:
1. the water bag filled with the zinc chloride solution with a certain concentration can simulate foundation pit excavation in actual engineering under the condition of no shutdown; the shaft lever provided with the axial force meter and the jack can simulate the process of adding foundation pit support; the pressure water tank module can realize surge damage by adjusting the water level in the water tank;
2. the device can reproduce the catastrophe overall process of confined water inrush damage in deep foundation pit excavation in the water-rich soft soil area, and provides test basis for preventing and controlling foundation pit inrush in engineering;
3. a displacement sensor and a soil pressure sensor in the device can respectively capture a soil displacement field and a soil pressure value in the processes of foundation pit excavation and inrush destruction in real time, and provide a basis for theoretical research.
Drawings
Fig. 1 and 2 are front views of the present invention;
FIG. 3 is a schematic view of the water bag of the present invention;
FIG. 4 is a schematic view of the iron box of the present invention;
in the figure, a mold box 1, a large partition plate 2, a pressurized water tank 3, a constant pressure water tank 4, a jack 5, a small partition plate 6, a support 7, a water bag 8, an iron box 9, a shaft rod 10, a first water inlet valve 11, a first water outlet valve 12, a second water outlet valve 13, a second water inlet valve 14, a third water inlet valve 15, a first displacement sensor 16, a second displacement sensor 17, a first pore pressure sensor 18, a second pore pressure sensor 19, a third pore pressure sensor 20, a fourth pore pressure sensor 21, a fifth pore pressure sensor 22, a sixth pore pressure sensor 23, a first soil pressure sensor 24, a second soil pressure sensor 25, a third soil pressure sensor 26 and an axial force meter 27 are shown.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. In the following description and in the drawings, the same numbers in different drawings identify the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus consistent with certain aspects of the invention, as detailed in the appended claims. Various embodiments of the present description are described in an incremental manner.
It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit ly indicating the number of technical features indicated.
As shown in fig. 1 and 2, the utility model provides a total process of sudden surge and catastrophe under the combined action of excavation and unloading of foundation pit, which comprises a test module, a loading module, a constant pressure module, a pressurizing module and a measuring module;
the test module comprises a model box 1, a large partition plate 2, a small partition plate 6 and a water bag 8; the large partition plate 2 is arranged in the model box 1 and is welded and connected with the bottom of the model box 1, the model box 1 is divided into a left area and a right area, a simulated soil layer test block is filled in the right area, and an area is dug out from the left side of the simulated soil layer test block to serve as a simulated foundation pit; the small partition 6 is inserted into the simulated foundation pit and the small partition 6 is supported on the simulated soil test block through the loading module to serve as a simulated foundation pit support; the water bag 8 is placed in the simulated foundation pit, and after the water bag 8 is filled with liquid, two sides of the water bag respectively abut against the large partition plate 2 and the small partition plate 6 for simulating foundation pit excavation;
the constant pressure module is introduced to the bottom of the simulated soil layer test block, the inside of the simulated foundation pit and the outside of the simulated foundation pit through pipelines, so that the pressure-bearing water level before the simulation test is started, the water level in the foundation pit and the water level outside the foundation pit are the same;
the pressurizing module is introduced to the bottom of the simulated soil layer test block through a pipeline and is used for simulating the upward jacking of the confined water;
the measuring module is used for obtaining the supporting pressure of the loading module, the vertical displacement value outside the foundation pit, the active soil pressure, the passive soil pressure, the pore pressure value in the simulated soil layer test block and the soil pressure value in the simulated soil layer test block.
In the present embodiment, the loading module comprises a jack 5, a shaft 10 and a bracket 7; the jack 5 is fixed on the support 7 through a bolt to provide counter force, the support 7 is fixed on the left area of the model box 1 through a bolt, the large partition plate 2 is provided with a hole for the shaft rod 10 to pass through, the water bag 8 is also provided with a hole (as shown in figure 3), the shaft rod 10 passes through the hole reserved on the large partition plate and the water bag with the hole and is supported on the small partition plate in a contact manner to ensure that the horizontal displacement of the small partition plate is zero during the test. Vaseline is coated on the contact surfaces of the shaft rod 10, the large clapboard 2 and the water bag 8 to reduce friction.
In the embodiment of the application, the simulated soil layer test block is formed by consolidating a sandy soil cushion layer and clay arranged on the upper part of the sandy soil cushion layer.
In the embodiment of the application, the water bag 8 is filled with liquid, and the gravity of the liquid is the same as the specific gravity of the clay used in the test.
In the embodiment of the application, before the test is started, the liquid in the water bag 8 is as high as the simulated soil test block on the right side of the small partition 6.
In the embodiment of the application, the liquid is zinc chloride solution with a certain concentration, and the mass concentration range is 63% -68%, so that the solution gravity is the same as or very similar to the clay specific gravity used in the test.
In the embodiment of the present application, the constant pressure module includes a constant pressure water tank 4, a first water inlet valve 11, a first drain valve 12, a second drain valve 13, and a second water inlet valve 14; the constant-pressure water tank 4 leads water in the water tank to the left simulation foundation pit of the small partition plate 6 through a water inlet pipe, a first water inlet valve 11 is arranged in the water inlet pipe, the water inlet pipe is also connected with a water outlet pipe, and a second water outlet valve 13 is arranged on the water outlet pipe; the constant pressure water tank 4 leads the water in the water tank to the bottom sand layer of the simulated soil layer test block through a water inlet pipe, and a second water inlet valve 14 is arranged in the water inlet pipe; the constant-pressure water tank 4 leads water in the water tank to the top of the simulated soil layer test block on the right side of the small partition plate 6 through a water inlet pipe; a water inlet pipe provided with a first drainage valve 12 penetrates through the large partition plate 2 and is arranged at a water outlet at one side of the water bag 8; through the connection of the pipelines, the pressure-bearing water level before the simulation test is started, the water level in the foundation pit and the water level outside the foundation pit are the same.
In this application embodiment, the constant voltage module still includes iron box 9, as shown in fig. 4, iron box 9 presss from both sides between simulation soil layer test block and model case 1 right side wall, and iron box 9 bottom has the water inlet, and constant voltage water tank 4 passes through the inlet tube and links to each other with the water inlet, and it has a delivery port to open on the iron box 9 lateral wall, and the delivery port is located the top department of simulation soil layer test block.
In the present embodiment, the pressurizing module comprises a pressurized water tank 3 and a third water inlet valve 15; the pressurized water tank 3 leads the water in the water tank to the bottom sand layer of the simulated soil layer test block through a water inlet pipe, and a third water inlet valve 15 is arranged in the water inlet pipe.
When the foundation pit excavation is simulated through experiments, the first drainage valve 12 is opened to gradually flow out the solution in the water bag 8, meanwhile, the first water inlet valve 11 is closed, and the second drainage valve 13 is opened, so that the water level inside the small partition plate 6 is gradually reduced; when the test simulates the sudden surge of the confined water, the second water inlet valve 14 is closed, the third water inlet valve 15 is opened, the water in the pressurized water tank 3 flows into the bottom sand layer on the right side of the large partition plate 2 through the water inlet pipe, and the water level in the pressurized water tank 3 is determined according to the confined water level set by the test.
In the embodiment of the present application, the measurement module includes a first displacement sensor 16, a second displacement sensor 17, a first pore pressure sensor 18, a second pore pressure sensor 19, a third pore pressure sensor 20, a fourth pore pressure sensor 21, a fifth pore pressure sensor 22, a sixth pore pressure sensor 23, a first soil pressure sensor 24, a second soil pressure sensor 25, a third soil pressure sensor 26, and an axial force meter 27;
the first displacement sensor 16 is arranged on the surface of the soil layer and used for measuring the vertical displacement of the top of the simulated soil layer test block in the test process;
the second displacement sensor 17 is arranged on the right side of the small partition plate and is used for measuring the horizontal displacement of the small partition plate in the test process;
the first pore pressure sensor 18 is arranged at the bottom of the constant pressure water tank 4 and used for determining the water pressure at the bottom of the constant pressure water tank in an initial state;
the second pore pressure sensor 19 is arranged at the bottom of the pressurized water tank 3 and is used for determining the water pressure at the bottom of the water tank when the sand layer is pressurized;
the third pore pressure sensor 20 is arranged at the bottom of the iron box 9 and used for determining the water pressure of the top surface of the simulated soil layer test block in the initial state;
the fourth pore pressure sensor 21 is arranged in clay on the right side of the small partition 6, has the same height as the bottom of the small partition 6, and is used for measuring the pore pressure at the height outside the foundation pit;
the fifth pore pressure sensor 22 is installed in clay on the left side of the small partition 6, has the same height as the bottom of the small partition 6, and is used for measuring the pore pressure of the inner side of the foundation pit at the height;
the sixth hole pressure sensor 23 is installed at the bottom of the water bag 8 and is used for measuring the water pressure at the bottom of the water bag 8;
the first soil pressure sensor 24 is arranged in clay on the left side of the small partition 6, has the same height as the bottom of the small partition 6, and is used for measuring the soil layer pressure at the height outside the foundation pit;
the second soil pressure sensor 25 is arranged on the contact surface of the small partition plate 6 and the simulated soil layer test block and is used for contacting the soil layer pressure of the contact surface;
the third soil pressure sensor 26 is arranged on the left side surface of the small partition plate 6 and is used for measuring the soil layer pressure on the left side surface;
the axle force meter 27 is arranged between the measuring jack 5 and the axle rod 10 and is used for measuring the supporting pressure of the small partition plate 6.
The utility model discloses soft soil layer suddenly gushes the experimental concrete implementation process of catastrophe overall process as follows under confined water top-lifting and foundation ditch excavation uninstallation combined action during simulation foundation ditch excavation:
1. filling prepared sandy soil into the right area of the model box 1; filling the prepared clay on the upper part of the sandy soil cushion layer, and solidifying under the condition of 1 g; after the consolidation is finished, embedding a fourth pore pressure sensor 21, a fifth pore pressure sensor 22 and a first soil pressure sensor 24; in test soil, inserting the small partition plate 2 into a soil body to a certain depth, simulating foundation pit support, and embedding a second soil pressure sensor 25 and a third soil pressure sensor 26; digging out part of soil on the left side of the small partition plate 6, and placing the water bag 8 into the foundation pit; connecting the jack 5 with the shaft lever 10 by using an axial force meter 27, and enabling the shaft lever 10 to pass through a hole reserved on the large partition plate 2 and a hole on the water bag 8; opening the jack 5 to allow a pressure reading to be taken on the axial force gauge 27 to ensure that the shaft 10 has just pushed against the small partition 6; a water inlet pipe provided with a first drainage valve 12 penetrates through the large partition plate 2 and is arranged at a water outlet at one side of the water bag 8 with a hole; closing the first drainage valve 12, pouring zinc chloride solution with certain concentration into the water bag 8 with the hole, wherein the height of the zinc chloride solution is flush with the top surface of the soil layer on the right side of the small partition plate 6 so as to simulate the dead weight of the excavated soil body; mounting a first displacement sensor 16 and a second displacement sensor 17;
2. closing the first water inlet valve 11, the second water discharge valve 13 and the second water inlet valve 14, and injecting water into the constant-pressure water tank 4, wherein the water level is flush with the top surface of the test soil; closing the third water inlet valve 15, and injecting water into the pressurized water tank 3, wherein the water level height is consistent with the pressure of the designed confined water head; opening a second water inlet valve 14, enabling water in the constant-pressure water tank 4 to flow into the sand layer, enabling the water level in the sand layer in the initial state to be consistent with the water level in the constant-pressure water tank 4, and then closing the second water inlet valve 14; opening a first water inlet valve 11, enabling water in the constant pressure water tank 4 to flow into the inner side of the foundation pit, enabling the water level on the left side of the small partition plate in the initial state to be consistent with the water level in the constant pressure water tank 4, and then closing the first water inlet valve 11;
3. opening the centrifugal machine, and solidifying the soil in the model box 1 under the gravitational acceleration of ng; after the soil body is solidified, opening a first drainage valve 12, gradually discharging the zinc chloride solution in the water bag 8, and simultaneously opening a second drainage valve 13 to lower the water level at the inner side of the foundation pit and simulate foundation pit excavation; the shaft lever 10 keeps the horizontal displacement of the small partition plate 6 unchanged in the excavation process, and the axial force meter 27 can obtain the supporting pressure on the shaft lever 10;
4. and after the reading of the sixth pore pressure sensor 23 is zero, the third water inlet valve 15 is opened, the water in the pressurized water tank 3 flows into the sand layer, the simulation pressure-bearing water level suddenly rises, the clay layer in the model box 1 is subjected to the jacking action of the pressure-bearing water in the sand layer, and when the pressure-bearing water level is high enough, the foundation pit is suddenly gushed and damaged. During the test, the first displacement sensor 16 can obtain the vertical displacement value outside the foundation pit; the second soil pressure sensor 25 at the outer side of the small partition 6 can obtain the active soil pressure at the corresponding position; the third soil pressure sensor 26 at the inner side of the small clapboard 6 can obtain the passive soil pressure at the corresponding position; the fourth pore pressure sensor 21 and the fifth pore pressure sensor 22 can obtain pore pressure values of corresponding positions in the soil body; the first soil pressure sensor 24 can obtain the soil pressure value of the corresponding position in the soil body; at the end of the test, the third water inlet valve 15 is closed and the pressurization is terminated. The test is now complete.
The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structures or equivalent flow changes made by the contents of the specification and the drawings, or directly or indirectly applied to other related technical fields, are included in the same way in the protection scope of the present invention.
Claims (10)
1. A device for simulating the whole process of sudden gushing and catastrophe of a foundation pit is used for simulating the whole process of sudden gushing and catastrophe under the combined action of jacking of a soft soil layer on confined water and unloading of foundation pit excavation during foundation pit excavation and is characterized by comprising a test module, a loading module, a constant pressure module, a pressurizing module and a measuring module;
the test module comprises a model box, a large partition plate, a small partition plate and a water bag; the large partition plate is arranged in the model box and divides the model box into a left area and a right area, a simulated soil layer test block is filled in the right area, and an area is dug out on the left side of the simulated soil layer test block to serve as a simulated foundation pit; the small partition is inserted into the simulated foundation pit and is jacked on the simulated soil test block through the loading module to serve as a simulated foundation pit support; the water bag is placed in the simulated foundation pit, and after the water bag is filled with liquid, two sides of the water bag respectively abut against the large partition plate and the small partition plate;
the constant pressure module is introduced to the bottom of the simulated soil layer test block, the inside of the simulated foundation pit and the outside of the simulated foundation pit through pipelines;
the pressurizing module is introduced to the bottom of the simulated soil layer test block through a pipeline;
the measuring module comprises a plurality of displacement sensors, a plurality of pore pressure sensors and a plurality of soil pressure sensors, and is arranged in the test module, the loading module, the constant pressure module and the pressurizing module.
2. The device for simulating the whole process of the foundation pit inrush disaster according to claim 1, wherein the loading module comprises a jack, a shaft rod and a bracket; the jack is fixed in the left area of the model box through the support, the large partition plate is provided with a hole for the shaft rod to pass through, and the jack props against the small partition plate through the shaft rod.
3. The device for simulating the whole process of the foundation pit inrush disaster according to claim 1, wherein the simulated soil layer test block is formed by consolidating a sandy soil cushion layer and clay arranged on the upper part of the sandy soil cushion layer.
4. The device for simulating the whole process of the foundation pit piping disaster according to claim 1, wherein the water bag is filled with liquid, and the gravity of the liquid is the same as the specific gravity of clay used in the test.
5. The device for simulating the whole process of the sudden inrush of the foundation pit as claimed in claim 4, wherein before the test, the height of the liquid in the water bag is consistent with the height of the simulated soil test block on the right side of the small partition.
6. The device for simulating the whole process of foundation pit piping disaster according to claim 4, wherein the liquid is zinc chloride solution.
7. The device for simulating the whole process of the foundation pit inrush disaster according to claim 1 or 2, wherein the constant pressure module comprises a constant pressure water tank, a first water inlet valve, a first water discharge valve, a second water discharge valve and a second water inlet valve; the constant-pressure water tank leads water in the water tank to the left simulation foundation pit of the small partition plate through a water inlet pipe, a first water inlet valve is arranged in the water inlet pipe, the water inlet pipe is also connected with a water outlet pipe, and a second water outlet valve is arranged on the water outlet pipe; the constant-pressure water tank leads the water in the water tank to a bottom sand layer of the simulated soil layer test block through a water inlet pipe, and a second water inlet valve is arranged in the water inlet pipe; the constant-pressure water tank leads water in the water tank to the top of the simulated soil layer test block on the right side of the small partition plate through a water inlet pipe; and a water inlet pipe provided with a first drainage valve penetrates through the large partition plate and is fixedly arranged at a water outlet at one side of the water bag through a flange plate.
8. The device of claim 7, wherein the constant pressure module further comprises an iron box sandwiched between the soil layer simulation test block and the right side wall of the mold box, the bottom of the iron box is provided with a water inlet, the constant pressure water tank is connected with the water inlet through a water inlet pipe, the side wall of the iron box is provided with a water outlet groove, and the water outlet groove is located at the top of the soil layer simulation test block.
9. The device for simulating the whole process of the foundation pit inrush disaster according to claim 7, wherein the pressurizing module comprises a pressurizing water tank and a third water inlet valve; the pressurized water tank leads the water in the water tank to the bottom sand layer of the simulated soil layer test block through a water inlet pipe, and a third water inlet valve is arranged in the water inlet pipe.
10. The device for simulating the whole process of the foundation pit inrush disaster according to claim 9, wherein the measuring module comprises
A first displacement sensor for measuring the vertical displacement of the top of the simulated soil test block in the test process,
A second displacement sensor for measuring the horizontal displacement of the small partition plate in the test process,
A first pore pressure sensor for determining the water pressure at the bottom of the constant pressure water tank in the initial state,
A second pore pressure sensor for determining the water pressure at the bottom of the water tank when pressurizing the sand layer,
A third pore pressure sensor for determining the water pressure of the top surface of the simulated soil test block in the initial state,
A fourth pore pressure sensor arranged in the clay on the right side of the small partition plate, the height of the fourth pore pressure sensor is the same as that of the bottom of the small partition plate, and the fourth pore pressure sensor is used for measuring the pore pressure of the height outside the foundation pit,
The height of the clay is the same as the bottom of the small partition plate, and the clay is used for measuring the hole pressure of the height inside the foundation pit; a fifth pore pressure sensor,
A sixth hole pressure sensor for measuring the water pressure at the bottom in the water bag,
A first soil pressure sensor arranged in the clay at the left side of the small partition plate and having the same height as the bottom of the small partition plate and used for measuring the soil layer pressure at the height outside the foundation pit,
A second soil pressure sensor arranged on the contact surface of the small clapboard and the simulated soil layer test block and used for the soil layer pressure of the contact surface,
A third soil pressure sensor arranged on the left side surface of the small clapboard and used for the soil layer pressure on the left side surface,
And the axial force meter is arranged between the measuring jack and the shaft lever and is used for measuring the supporting pressure of the small partition plate.
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| CN201921347184.3U CN210797676U (en) | 2019-08-19 | 2019-08-19 | Device for simulating overall process of foundation pit inrush disaster |
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| CN201921347184.3U CN210797676U (en) | 2019-08-19 | 2019-08-19 | Device for simulating overall process of foundation pit inrush disaster |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110485483A (en) * | 2019-08-19 | 2019-11-22 | 浙江大学 | A kind of device for simulating Foundation Pit Pouring catastrophe overall process |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110485483A (en) * | 2019-08-19 | 2019-11-22 | 浙江大学 | A kind of device for simulating Foundation Pit Pouring catastrophe overall process |
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