CN218974351U - Shield tunnel vehicle induced settlement model test device - Google Patents
Shield tunnel vehicle induced settlement model test device Download PDFInfo
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- CN218974351U CN218974351U CN202222775302.9U CN202222775302U CN218974351U CN 218974351 U CN218974351 U CN 218974351U CN 202222775302 U CN202222775302 U CN 202222775302U CN 218974351 U CN218974351 U CN 218974351U
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Abstract
The utility model discloses a shield tunnel vehicle induced settlement model test device which comprises a waterproof model groove and a model tunnel, wherein a cavity of the waterproof model groove is sequentially filled with a gravel layer and a sample soil body from bottom to top, the model tunnel is horizontally buried in the sample soil body, an excitation device is arranged at the center of the inside of the model tunnel, pressure monitoring devices are respectively arranged at the top and bottom centers of the model tunnel, pore water pressure gauges are distributed around the model tunnel at equal intervals, a ground surface settlement monitoring mark and a tunnel settlement monitoring mark are respectively arranged on the surface of the sample soil body and the top of the model tunnel, and an underground water level monitoring device is arranged outside the waterproof model groove. The utility model has the advantages that: by adopting the device, the sedimentation of the tunnel, the deformation of the soil pressure at the top and the bottom of the tunnel and the change of the water pressure around the tunnel under the vibration influence of the subway train can be conveniently simulated, so that the influence of the vibration load, the frequency, the vibration time, the physical and mechanical properties of stratum soil, the change of the groundwater level and other factors on the sedimentation of the tunnel vehicle can be studied.
Description
Technical Field
The utility model relates to the technical field of tunnel settlement monitoring, in particular to a device for testing a tunnel settlement model of a shield tunnel.
Background
In actual operation of a subway, due to factors such as train vibration, tunnel water leakage, artificial engineering activities on the ground surface and the like, water and soil pressure near the tunnel can be inevitably influenced, uneven settlement of the tunnel is easily caused, irregularity of a track line is caused, and severe train vibration is caused to generate vicious circle. For track traffic, the irregularity of a track line often seriously affects the operation safety of a train, so that research on a shield tunnel settlement mechanism and a prediction method is necessary.
In the existing shield tunnel settlement research, most scholars choose to establish a two-dimensional finite element model for numerical simulation test research, actual situation results and numerical simulation results often come in and go out, most finite element models often have respectively applicable specific working conditions and cannot be universally applicable, most finite element analysis software at the present stage belongs to commercial software and is not special analysis software for building engineering, and a plurality of professional module groups cannot be realized; in the current stage, regarding the physical simulation research of shield tunnel settlement, most of indoor model tests are centrifugal model tests, the centrifugal model tests generally manufacture a reduced scale model according to requirements, and test simulation is carried out under the condition that the model is consistent with the prototype parameter characteristics, but the centrifugal model test parameters are difficult to monitor, the accuracy of the requirements on monitoring sensors is high, the technical difficulty of the centrifugal model test is high, and the cost is high; some indoor model tests of the non-centrifugal model test cannot monitor the underground water level in real time, and the real-time influence of the underground water level change on the tunnel settlement is not considered; some scholars study the shield tunnel settlement through field monitoring and experience methods, the field monitoring is closest to the actual change condition, but the field monitoring is long in time consuming period, the monitoring data amount is complicated, an actual large-scale monitoring instrument is needed, and for a single research vehicle settlement mechanism, the method is feasible but the actual application is not extensive.
Disclosure of Invention
According to the defects of the prior art, the utility model provides the vehicle-induced settlement model test device for the shield tunnel, which is beneficial to researching the settlement rule of the tunnel by setting a model tunnel and monitoring each settlement parameter of the model tunnel.
The utility model is realized by the following technical scheme:
the utility model provides a shield tunnel car subsides model test device, its characterized in that: including waterproof model groove and model tunnel, from supreme rubble layer and the sample soil body of packing in proper order down in the cavity in waterproof model groove, the model tunnel level bury in the sample soil body, the inside center department of model tunnel installs vibration excitation device, model tunnel top and bottom center department respectively are provided with pressure monitoring device, equidistant pore water pressure gauge of having laid around the model tunnel, sample soil body surface with earth's surface subsidence monitoring mark and tunnel subsidence monitoring mark are installed respectively at model tunnel top, waterproof model inslot is equipped with groundwater level monitoring device outward.
The underground water level monitoring device comprises a ball valve switch, a liquid level pipe and a three-way pipe, wherein one pipe orifice of the three-way pipe penetrates through the waterproof model groove and is arranged in the crushed stone layer, the ball valve switch is arranged on the second pipe orifice of the three-way pipe, and the third pipe orifice of the three-way pipe is connected with the liquid level pipe.
An anti-blocking water permeable net is arranged on a pipe orifice in the crushed stone layer in the three-way pipe.
The tunnel subsidence monitoring mark is installed at the top of the model tunnel through a sleeve, the bottom end of the sleeve is connected with the top of the model tunnel, and the top end of the sleeve extends out of the surface of the sample soil body.
And a water filtering gauze layer is laid between the sample soil body and the crushed stone layer.
The pressure monitoring device is a water bag pressure gauge.
The utility model has the advantages that:
1. multiple data such as tunnel settlement, earth surface settlement, settlement compression amount of soil mass at the upper part of the tunnel, soil pressure around the tunnel, pore water pressure of soil mass around the tunnel and the like can be obtained simultaneously;
2. compared with a two-dimensional finite element model, the method does not need numerical consideration of actual interaction and change rules among the main bodies of the device, and the test result is closer to the actual;
3. the method can be used for simulating the vehicle-induced settlement of the shield tunnel in the sandy soil stratum and the soft soil stratum, and is widely applicable to various soil bodies;
4. the underground water level monitoring device is arranged outside the model groove, so that the underground water level can be monitored more accurately;
5. the water injection port is arranged at the bottom of the model groove, so that the water injection flow rate can be conveniently controlled, and the structure of the soil layer structure in the groove is not influenced.
Drawings
FIG. 1 is a schematic front section view of a shield tunnel vehicle induced settlement model test apparatus of the present utility model;
FIG. 2 is a schematic side sectional view of a test device for a vehicle induced settlement model of a shield tunnel according to the present utility model.
Detailed Description
The features of the utility model and other related features are described in further detail below by way of example in conjunction with the following figures to facilitate understanding by those skilled in the art:
as shown in fig. 1-2, marks 1-15 in the drawings are respectively represented by a ball valve switch 1, an anti-blocking water permeable net 2, a cavity 3, a liquid level pipe 4, a waterproof model groove 5, a pressure monitoring device 6, an excitation device 7, a model tunnel 8, a ground surface subsidence monitoring mark 9, a gravel layer 10, a water filtering gauze layer 11, a sleeve 12, a tunnel subsidence monitoring mark 13, a sample soil body 14 and a pore water pressure gauge 15.
Examples: as shown in fig. 1-2, this embodiment relates to a device for testing a vehicle-induced settlement model of a shield tunnel, which mainly includes a waterproof model groove 5 and a model tunnel 8, wherein the waterproof model groove 5 is made of high-strength materials, a hollow cavity 3 is formed by an internal enclosing area of the waterproof model groove 5, a test soil body 14 is filled in the cavity 3, and the model tunnel 8 is horizontally buried in the sample soil body 14. In the embodiment, the waterproof model groove 5 is 88cm long, 82.5cm wide and 105cm high, the model tunnel 8 is 80cm long, 27cm in diameter and 34cm in actual model tunnel burial depth. The sample soil body 14 adopts sand soil, so that the sample soil body 14 required by filling can be researched according to practical tests, and the method is suitable for simulating tunnel settlement caused by train excitation load action under different soil body environments.
As shown in fig. 1-2, in this embodiment, the sample soil is sand, in order to prevent the sand from easily losing due to excessive pore water pressure at the water injection port during water injection, the soil layer structure is unstable, and a large-particle-size gravel layer 10 with a thickness of 5.5cm is laid at the bottom of the waterproof model groove 5. And considering that the particle sizes of the broken stones are excessively uneven, a water filtering gauze layer 11 is paved between the sample soil body 14 and the broken stone layer 10, so that the broken stones can be effectively prevented from being filled by sand particles.
As shown in fig. 1-2, an excitation device 7 is welded at the center of the inside of a model tunnel 8, and the excitation device 7 can be adjusted to perform test simulation according to the actual condition of subway operation by starting the excitation device 7 to simulate train load.
As shown in fig. 1-2, in order to synchronously detect the pressure conditions applied to the top and bottom of the model tunnel 8, pressure monitoring devices 6 are respectively disposed at the centers of the top and bottom of the model tunnel 8, and in this embodiment, the pressure monitoring devices 6 are water-bag pressure gauges.
As shown in fig. 1-2, pore water pressure gauges 15 are distributed at equal intervals around the model tunnel 8 to measure the pore water pressure of the soil around the model tunnel 8.
As shown in fig. 1-2, the surface of the sample soil body 14 and the top of the model tunnel 8 are respectively provided with a surface subsidence monitoring mark 9 and a tunnel subsidence monitoring mark 13, and the surface subsidence monitoring mark 9 and the tunnel subsidence monitoring mark 13 can form a subsidence monitoring net, wherein the tunnel subsidence monitoring mark 13 is arranged at the top of the model tunnel 8 through a sleeve 12, the bottom end of the sleeve 12 is connected with the top of the model tunnel 8, and the top end extends out of the surface of the sample soil body 14. In this embodiment, adjacent tunnel settlement monitoring marks 13 are spaced 16.5cm apart, and adjacent earth surface settlement monitoring marks 9 are spaced 16.5cm apart.
As shown in fig. 1-2, the underground water level monitoring device is arranged outside the waterproof model groove 5, and comprises a ball valve switch 1, a liquid level pipe 4 and a three-way pipe, wherein the test generally comprises water injection and water drainage, one pipe orifice (water outlet) of the three-way pipe penetrates through the waterproof model groove 5 and is arranged in the gravel layer 10, the ball valve switch 1 is arranged on the two pipe orifices (water injection ports) of the three-way pipe, and the three pipe orifices of the three-way pipe are connected with the liquid level pipe 4, so that the underground water level can be intuitively monitored through the liquid level pipe 4, and the actual test is prevented from being influenced. In addition, in order to prevent broken stone and sample soil body 14 from blocking the water filling port, an anti-blocking water permeable net 2 can be arranged at the water outlet of the bottom layer of the inner wall of the model tunnel 8.
In summary, the device can simultaneously obtain multiple data such as tunnel settlement, earth surface settlement, settlement compression amount of soil mass at the upper part of the tunnel, soil pressure around the tunnel, pore water pressure of soil mass around the tunnel and the like; compared with a two-dimensional finite element model, the method does not need numerical consideration of actual interaction and change rules among the main bodies of the device, and the test result is closer to the actual; the method can be used for simulating the settlement caused by the sand stratum shield tunnel vehicle, and can also be used for simulating the settlement caused by the soft soil stratum shield tunnel vehicle, so that the application range is wide; the underground water level monitoring device is arranged outside the model groove, so that the underground water level can be monitored more accurately; the water injection port is arranged at the bottom of the model groove, so that the water injection flow rate can be conveniently controlled, and the soil structure in the groove is not influenced.
Although the foregoing embodiments have been described in some detail with reference to the accompanying drawings, it will be appreciated by those skilled in the art that various modifications and changes may be made thereto without departing from the scope of the utility model as defined in the appended claims, and thus are not repeated herein.
Claims (6)
1. The utility model provides a shield tunnel car subsides model test device, its characterized in that: including waterproof model groove and model tunnel, from supreme rubble layer and the sample soil body of packing in proper order down in the cavity in waterproof model groove, the model tunnel level bury in the sample soil body, the inside center department of model tunnel installs vibration excitation device, model tunnel top and bottom center department respectively are provided with pressure monitoring device, equidistant pore water pressure gauge of having laid around the model tunnel, sample soil body surface with earth's surface subsidence monitoring mark and tunnel subsidence monitoring mark are installed respectively at model tunnel top, waterproof model inslot is equipped with groundwater level monitoring device outward.
2. The shield tunnel vehicle induced settlement model test device according to claim 1, wherein: the underground water level monitoring device comprises a ball valve switch, a liquid level pipe and a three-way pipe, wherein one pipe orifice of the three-way pipe penetrates through the waterproof model groove and is arranged in the crushed stone layer, the ball valve switch is arranged on the second pipe orifice of the three-way pipe, and the third pipe orifice of the three-way pipe is connected with the liquid level pipe.
3. The shield tunnel vehicle settlement model test device according to claim 2, wherein: an anti-blocking water permeable net is arranged on a pipe orifice in the crushed stone layer in the three-way pipe.
4. The shield tunnel vehicle induced settlement model test device according to claim 1, wherein: the tunnel subsidence monitoring mark is installed at the top of the model tunnel through a sleeve, the bottom end of the sleeve is connected with the top of the model tunnel, and the top end of the sleeve extends out of the surface of the sample soil body.
5. The shield tunnel vehicle induced settlement model test device according to claim 1, wherein: and a water filtering gauze layer is laid between the sample soil body and the crushed stone layer.
6. The shield tunnel vehicle induced settlement model test device according to claim 1, wherein: the pressure monitoring device is a water bag pressure gauge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222775302.9U CN218974351U (en) | 2022-10-21 | 2022-10-21 | Shield tunnel vehicle induced settlement model test device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222775302.9U CN218974351U (en) | 2022-10-21 | 2022-10-21 | Shield tunnel vehicle induced settlement model test device |
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| CN218974351U true CN218974351U (en) | 2023-05-05 |
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| CN202222775302.9U Active CN218974351U (en) | 2022-10-21 | 2022-10-21 | Shield tunnel vehicle induced settlement model test device |
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