CN218271750U - Shield tunnel model test device - Google Patents
Shield tunnel model test device Download PDFInfo
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- CN218271750U CN218271750U CN202222315829.3U CN202222315829U CN218271750U CN 218271750 U CN218271750 U CN 218271750U CN 202222315829 U CN202222315829 U CN 202222315829U CN 218271750 U CN218271750 U CN 218271750U
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Abstract
The utility model provides a shield tunnel model test device, which comprises a model box; test soil is filled in the model box, a shield tunnel model is buried in the test soil, and a displacement sensor is arranged at the arch top of the shield tunnel model; the test soil at the bottom of the shield tunnel model is used for simulating the construction of the newly-built shield tunnel; an initial opening and a receiving opening of the newly-built shield tunnel are arranged on two sides of the model box; a hydraulic jack and a speed reducing motor are arranged at the starting port of the newly-built shield tunnel; an output shaft of the hydraulic jack is fixedly connected with a speed reducing motor, an acrylic tube is arranged on the speed reducing motor, strain gauges are arranged on the outer wall and the inner wall of the acrylic tube, a soil pressure box is arranged on the outer wall of the acrylic tube, a spiral soil discharging device and a linear optical axis are arranged inside the acrylic tube, a cutter head is fixed on the spiral soil discharging device and the linear optical axis, and a shield shell is arranged at the end part of the acrylic tube; the other end of the acrylic pipe is provided with a soil discharging port.
Description
Technical Field
The utility model belongs to the technical field of push pipe construction test device, specifically belong to a shield tunnel model test device.
Background
The shield method is a common method for building underground railways, and has become a main means for building underground railways due to the advantages of high quality, high efficiency, safety and the like. Meanwhile, with the continuous improvement of the underground traffic network, the situation that a newly-built shield tunnel penetrates an existing shield tunnel interval downwards increases day by day, the approach construction situation happens occasionally, different space intersection angles exist between the newly-built shield tunnel and the existing interval tunnel, and a plurality of technical problems can be encountered in the construction process. The shield construction is carried out in an almost closed space, the influence of disturbance generated in the construction process on the surrounding stratum environment and surrounding structures is difficult to control effectively, the potential safety hazard of shield under-penetration construction in the near-by way is solved, the construction risk is reduced, reasonable and effective analysis can be carried out on the actual under-penetration condition before the construction, the effect of the construction disturbance on the stress and deformation of the existing tunnel and the response problem of the earth surface are mastered in advance, and the method is particularly important.
Aiming at the problems that the field test operation is complex and the cost is too high, the original piece is difficult to bury and the like in the existing research means, the development of the indoor model test to simulate the actual working condition is particularly necessary. At present, the existing indoor shield model test has few research modes, does not consider the shield dynamic excavation process, and has the problem of large model test error.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem that exists among the prior art, the utility model provides a shield tunnel model test device considers a series of influences that the shield constructs developments excavation down produced, establishes the monitoring system and the earth's surface settlement monitoring system in existing tunnel, realizes dynamic excavation, real-time supervision and data acquisition's integration simulation, has theoretical and realistic meaning.
In order to achieve the above object, the utility model provides a following technical scheme:
a shield tunnel model test device comprises a model box;
test soil is filled in the model box, a shield tunnel model is buried in the test soil, and a displacement sensor is arranged at the arch top of the shield tunnel model; the test soil at the bottom of the shield tunnel model is used for simulating the construction of the newly-built shield tunnel; an initial opening and a receiving opening of the newly-built shield tunnel are formed in two sides of the model box;
a hydraulic jack and a speed reducing motor are arranged at the starting port of the newly-built shield tunnel; an output shaft of the hydraulic jack is fixedly connected with a speed reducing motor, an acrylic tube is arranged on the speed reducing motor, strain gauges are arranged on the outer wall and the inner wall of the acrylic tube, a soil pressure box is arranged on the outer wall of the acrylic tube, a spiral soil discharging device and a linear optical axis are arranged inside the acrylic tube, a cutter head is fixed on the spiral soil discharging device and the linear optical axis, and a shield shell is arranged at the end part of the acrylic tube; the other end of the acrylic pipe is provided with a soil discharging port.
Preferably, a bearing bracket is fixed at an originating opening of the model box, a slideway is arranged on the bearing bracket, and the sliding block and the self-locking sliding block are arranged on the slideway;
the self-locking sliding block is provided with a hydraulic jack bearing plate, a hydraulic jack fixing support is arranged on the hydraulic jack bearing plate, and the hydraulic jack is installed on the hydraulic jack fixing support;
a motor bearing plate is fixed on the sliding block, a speed reducing motor fixing support is arranged on the motor bearing plate, and the speed reducing motor is installed on the speed reducing motor fixing support.
Further, the hydraulic jack is connected with a hydraulic jack control system through a high-pressure oil pipe; and a pressure gauge is arranged on the hydraulic jack control system.
Furthermore, a hydraulic jack cushion block is arranged at the bottom of the hydraulic jack.
Preferably, the speed reducing motor is electrically connected with a motor speed regulator, and the motor speed regulator is used for regulating and controlling the soil body cutting speed of the cutter head.
Preferably, the output shaft of the speed reduction motor is connected with the linear optical axis through a coupling.
Preferably, the model box is of a frame structure welded by square steel pipes, and the side surface and the bottom surface of the model box are made of organic glass plates.
Preferably, the displacement sensor is a pull rod type linear displacement sensor, and an ABS circular tube is sleeved outside a pull rod on the displacement sensor.
Furthermore, the pull rod type linear displacement sensor is fixed at the top of the model box through a pull rod type linear displacement sensor fixing support.
Preferably, the end of the displacement sensor is provided with a wiring socket.
Compared with the prior art, the utility model discloses following profitable technological effect has:
the utility model provides a shield tunnel model test device realizes the simulation of the different propulsion speed of shield structure and soil storehouse pressure through adjustment hydraulic jack's jacking force and gear motor's rotational speed to this optimum parameter of exploring shield structure construction can provide valuable data foundation for actual construction, reduces the construction risk. The method can study the stress deformation influence on the existing tunnel and the change condition of the soil pressure of the surrounding stratum caused by disturbance generated in the dynamic shield construction process, and consider the settlement change rule of the stratum in the excavation process. The clear distance and the space included angle between the existing tunnel and the newly-built tunnel are adjusted to simulate various working conditions of the shield under the approaching condition. Meanwhile, the model test has strong operability, so that the actual construction working condition can be simulated really, and the method has high practical value.
Furthermore, an ABS circular tube is sleeved outside the pull rod and used for isolating the pull rod and test soil, so that the pull rod of the displacement sensor can freely stretch and retract, and the deformation quantity of the existing shield tunnel is accurately measured;
drawings
FIG. 1 is a schematic view of the model box of the present invention along the longitudinal direction of the top pipe;
FIG. 2 is a longitudinal schematic view of the model box of the present invention along an existing tunnel;
FIG. 3 is a schematic top view of the pipe jacking system of the present invention;
FIG. 4 is a schematic side view of the pipe jacking system of the present invention;
FIG. 5 is a schematic view of a strain gage on a tunnel model;
FIG. 6 is a schematic view of the earth pressure cell on a tunnel model;
fig. 7 is a schematic view of the cutter head of the present invention.
In the drawings: the device comprises a model box 1, a pull rod 2, test soil 3, a newly-built shield tunnel 4, a shield tunnel model 5, an ABS circular tube 6, a wiring socket 7, a pull rod type linear displacement sensor 8, a displacement sensor fixing support 9, a pipe jacking system bearing support 10, a slideway 11, a motor bearing plate 12, a hydraulic jack bearing plate 13, a sliding block 14, a self-locking sliding block 15, a self-locking sliding block wrench 16, a hydraulic jack 17, a high-pressure oil pipe 18, a hydraulic jack control system 19, a pressure gauge 20, a speed reducing motor 21, a motor speed regulator 22, a hydraulic jack fixing support 23, a speed reducing motor fixing support 24, a coupler 25, a soil discharge port 26, an acrylic pipe 27, a spiral soil discharger 28, a linear optical axis 29, a shell 30, a strain gauge 31, a soil pressure box 32, a cutter head 33 and a hydraulic jack cushion block 34.
Detailed Description
The present invention will be described in further detail with reference to specific examples, which are intended to be illustrative rather than restrictive.
Examples
As shown in fig. 1 and fig. 2, the present embodiment provides a shield tunnel model test apparatus, which includes a model box 1 made of square steel tube and transparent organic glass plate; the model box is filled with an undisturbed soil body serving as model test soil 3, according to the distribution condition of an actual soil layer, the soil is filled with impurities, silty clay and a sandy soil layer from top to bottom of the earth surface, therefore, the layering condition of the model test soil 3 is to correspond to the actual soil layer distribution condition, the filling thickness of each soil layer is converted according to a model similarity theory, the layering position of the soil layer is positioned according to scale marks on an organic glass plate, the ramming test soil 3 is filled in layers, the filling thickness of each soil layer is not more than 10cm, the next soil layer can be filled when the soil layer is compacted stably and meets the specified compaction degree, and the test soil is the undisturbed soil, so that the simulated data is closer to the actual situation of the site, and the test soil has more reference value.
The test soil 3 is filled in the arch bottom position of the existing tunnel, the shield tunnel model 5 adhered with the strain gauge 31 is placed at the appointed position in the model box, the soil pressure box is arranged at the appointed position on the plaster model, the arrangement modes of the strain gauge and the soil pressure box are respectively shown in figures 5 and 6, the existing tunnel model is made of plaster, and the stress and deformation characteristics of the existing tunnel model are closer to the conditions of actual segments. A pull rod type linear displacement sensor 8 is arranged at the vault position of the shield tunnel model 5, and the displacement sensor can accurately measure the influence of the excavation disturbance of the newly-built shield tunnel on the deformation of the existing gypsum tunnel pipe 4; the ABS circular tube 6 is arranged outside the displacement sensor pull rod 2, the pull rod is prevented from contacting with an external soil body, the pull rod is guaranteed to freely stretch out and draw back under the condition of no external influence factors, the displacement sensor wiring socket 7 is connected with matched acquisition software, and deformation of an existing tunnel can be accurately measured.
As shown in fig. 3 and 4, the shield tunneling machine system includes: a supporting bracket 10; a slideway 11 for fixedly supporting and guiding the propelling direction of the shield tunneling machine; a motor support plate 12; a hydraulic jack bearing plate 13; the slide block 14 is arranged on the slide way 11 and fixed at the bottom of the support plate 12 of the speed reducing motor, so that the speed reducing motor 21 and the support plate 12 can integrally slide back and forth; the self-locking sliding block 15 can manually adjust the sliding state and the locking state of the self-locking sliding block 15 through a self-locking sliding block wrench 16 on the self-locking sliding block 15, so that the sliding state and the locking state of the bearing plate 13 of the hydraulic jack can be adjusted and controlled, pushing counter force can be provided for the hydraulic jack 17 in the locking state, when the hydraulic jack 17 reaches the jacking range, the ejector rod of the hydraulic jack 17 is retracted, the sliding wrench 16 is loosened, the hydraulic jack 17 and the bearing plate 13 are integrally advanced to the shield advancing direction further, and then the next pushing progress can be carried out; the hydraulic jack 17 is arranged on a hydraulic jack fixing support 23, the propelling force of the jack can be controlled through a hydraulic jack control system 19, and the magnitude of the jacking force is read through a pressure gauge 20; the speed reducing motor 21 is arranged on the speed reducing motor fixing support 24 and provides torque for the cutter head 33 and the spiral soil discharger 28, and the motor speed regulator 22 matched with the speed reducing motor can regulate the soil cutting speed of the cutter head; the coupler 25 is connected with the speed reducing motor 21 and the linear optical axis 29; the spiral soil discharging device 28 and the cutter disc 33 are welded on the linear optical axis 29; an acrylic pipe 27 is adopted to simulate a newly-built shield tunnel 4, a soil discharging port 26 is positioned at the tail part of the acrylic pipe 27 and discharges cut soil, a hydraulic jack provides shield propelling force, and a speed reducing motor provides rotating torque for a cutter head and a spiral soil discharger, so that shield propelling, soil discharging and assembling ring forming are realized.
The utility model relates to a test method of wearing existing shield tunnel test device under simulation shield structure developments hugging closely for the influence problem that new construction produced under different clear distance, different space angle of intersection operating modes of new shield tunnel of simulation and existing shield tunnel, test device specific operation process as follows:
the filling thickness of each layer of test soil 3 in the model box 1 is converted and tamped according to a similar theory, the existing gypsum shield tunnel model 5 is buried into the test soil, the initial data of the strain gauge 31 and the soil pressure cell 32 measured by a balance data acquisition system is recorded, and the initial data of the pull rod type linear displacement sensor 8 is recorded;
placing a shield tunneling machine system at one side of a starting opening of a model box 1, placing a cutter head 33 at the starting opening, starting a speed reducing motor 21, operating the cutter head 33 and a spiral earth discharger 28, applying a propelling force by a hydraulic jack 17, realizing excavation and lining assembly of a newly-built shield tunnel 27, reading relative change values of data of an earth pressure box 32 and a strain gauge 31 by a data acquisition system at a certain distance of excavation, obtaining a strain increment generated by a dynamic excavation process of a newly-built shield tunnel 4 on a shield tunneling model 5, and further converting to obtain a stress increment of the shield tunneling model 5; the influence rule of the construction disturbance of the newly-built shield tunnel 4 on the stress of rock and soil mass around the shield tunnel model 5 can be analyzed through the data collected by the soil pressure cell 32; and acquiring data of the pull rod type linear displacement sensor 8, and calculating a difference value between a monitoring value and an initial value of the sensor to obtain a longitudinal deformation influence rule of the newly-built shield tunnel 4 construction on the shield tunnel model 5.
The burial depth of the arch bottom of the shield tunnel model 5 is changed, the clear distance between the newly-built shield tunnel 4 and the shield tunnel model 5 can be adjusted, the burying angle of the existing tunnel 5 can be adjusted, and the influence of the construction of the newly-built shield tunnel 4 at different downward-penetrating angles on the shield tunnel model 5 can be simulated. The simulation of different propelling speeds and soil bin pressure of the shield is realized by adjusting the propelling force of the hydraulic jack 17 and the rotating speed of the speed reducing motor 21, so that the optimal parameters of shield construction are searched, valuable data bases can be provided for actual construction, and the construction risk is reduced.
Claims (10)
1. A shield tunnel model test device is characterized by comprising a model box (1);
the model box (1) is filled with test soil (3), a shield tunnel model (5) is buried in the test soil (3), and a displacement sensor (8) is arranged at the arch top of the shield tunnel model (5); the test soil (3) at the bottom of the shield tunnel model (5) is used for simulating the construction of a newly-built shield tunnel (4); an initial opening and a receiving opening of a newly-built shield tunnel (4) are formed in two sides of the model box (1);
a hydraulic jack (17) and a speed reducing motor (21) are arranged at the starting port of the newly-built shield tunnel (4); an output shaft of the hydraulic jack (17) is fixedly connected with a speed reducing motor (21), an acrylic tube (27) is arranged on the speed reducing motor (21), strain gauges (31) are arranged on the outer wall and the inner wall of the acrylic tube (27), a soil pressure box (32) is arranged on the outer wall of the acrylic tube (27), a spiral soil discharging device (28) and a linear optical axis (29) are arranged inside the acrylic tube (27), a cutter head (33) is fixed on the spiral soil discharging device (28) and the linear optical axis (29), and a shield shell (30) is arranged at the end part of the acrylic tube (27); the other end of the acrylic pipe (27) is provided with a soil discharging port (26).
2. The shield tunnel model test device according to claim 1, characterized in that a bearing bracket (10) is fixed at the starting port of the model box (1), a slideway (11) is arranged on the bearing bracket (10), and a sliding block (14) and a self-locking sliding block (15) are arranged on the slideway (11);
a hydraulic jack bearing plate (13) is arranged on the self-locking sliding block (15), a hydraulic jack fixing support (23) is arranged on the hydraulic jack bearing plate (13), and a hydraulic jack (17) is installed on the hydraulic jack fixing support (23);
a motor bearing plate (12) is fixed on the sliding block (14), a speed reducing motor fixing support (24) is arranged on the motor bearing plate (12), and the speed reducing motor (21) is installed on the speed reducing motor fixing support (24).
3. The shield tunnel model test device according to claim 2, characterized in that the hydraulic jack (17) is connected with a hydraulic jack control system (19) through a high-pressure oil pipe (18); a pressure gauge (20) is arranged on the hydraulic jack control system (19).
4. The shield tunnel model test device according to claim 2, characterized in that a hydraulic jack cushion block (34) is arranged at the bottom of the hydraulic jack (17).
5. The shield tunnel model test device according to claim 1, wherein the speed reducing motor (21) is electrically connected with a motor speed regulator (22), and the motor speed regulator (22) is used for regulating and controlling the soil mass cutting speed of the cutter head (33).
6. The shield tunnel model test device according to claim 1, characterized in that the output shaft of the speed reducing motor (21) is connected with the linear optical axis (29) through a coupling (25).
7. The shield tunnel model test device according to claim 1, wherein the model box (1) is a frame structure welded by square steel pipes, and the side surfaces and the bottom surface of the model box (1) are made of organic glass plates.
8. The shield tunnel model test device according to claim 1, wherein the displacement sensor (8) is a pull rod type linear displacement sensor, and an ABS circular tube (6) is sleeved outside a pull rod (2) on the displacement sensor (8).
9. The shield tunnel model test device according to claim 8, wherein the pull rod type linear displacement sensor (8) is fixed on the top of the model box (1) through a pull rod type linear displacement sensor fixing support (9).
10. A shield tunnel model test device according to claim 1, characterized in that the end of the displacement sensor (8) is provided with a wiring socket (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222315829.3U CN218271750U (en) | 2022-08-31 | 2022-08-31 | Shield tunnel model test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222315829.3U CN218271750U (en) | 2022-08-31 | 2022-08-31 | Shield tunnel model test device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218271750U true CN218271750U (en) | 2023-01-10 |
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ID=84709655
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222315829.3U Active CN218271750U (en) | 2022-08-31 | 2022-08-31 | Shield tunnel model test device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218271750U (en) |
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2022
- 2022-08-31 CN CN202222315829.3U patent/CN218271750U/en active Active
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