CN212301171U - Subway tunnel surrounding rock dynamic response test device under simulation circulation dynamic load - Google Patents
Subway tunnel surrounding rock dynamic response test device under simulation circulation dynamic load Download PDFInfo
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- CN212301171U CN212301171U CN202021099565.7U CN202021099565U CN212301171U CN 212301171 U CN212301171 U CN 212301171U CN 202021099565 U CN202021099565 U CN 202021099565U CN 212301171 U CN212301171 U CN 212301171U
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Abstract
The utility model discloses a subway tunnel surrounding rock dynamic response test device under simulated circulation dynamic load, which comprises a model box, a tunnel model, a guide cylinder, a dynamic loading system, a bearing support structure, dynamic signal monitoring equipment and a control system; the model box is filled with soil, a tunnel model is embedded in the soil, the tunnel model is connected with a power loading system through a guide cylinder, the power loading system is connected with a dynamic signal monitoring device and a control system through an electro-hydraulic servo actuator, and the control system controls the power loading system to load the tunnel model. The test device can simulate the accumulated settlement change of the subway tunnel caused by the long-term operation vibration of the train and the influence on the peripheral stratum vibration of the tunnel more truly, and provides a reliable and convenient test platform for the subway tunnel under the long-term operation vibration of the train.
Description
Technical Field
The utility model belongs to the technical field of the underground works is experimental, especially, relate to a subway tunnel country rock dynamic response characteristic's under simulation circulation dynamic load test device.
Background
Along with the rapid development of urban construction in China, environmental problems caused by urban underground rail transit (subway) operation are increasingly highlighted, the vibration load of a subway train has the characteristics of large amplitude and high frequency, and the subway tunnel is easy to cause settlement deflection of a tunnel foundation and vibration influence of surrounding strata under the long-term operation vibration action of the train, so that the subway line generates uneven settlement deformation along the operation direction, and potential safety risk is formed on the normal operation of the subway train, for example, the first line of the Shanghai subway has no settlement basically at the initial stage of construction, but the settlement of the line is increased by 30-60mm after 8 months of formal operation, and the settlement of a branch section after 4 years even exceeds 140 mm; in addition, the settlement deformation of different degrees also occurs after the traffic operation of newly built subway lines in other cities in China; on the basis, the tunnel surrounding rock vibration caused by subway train operation generates larger uncertainty, so that the influence of the brought environmental vibration cannot be ignored; in conclusion, the effect of the train circulating vibration load has an important influence on the dynamic response characteristic of the surrounding rock of the subway tunnel, and the problem also draws wide attention in the engineering field at home and abroad.
At present, the construction speed of urban rail transit is faster and faster, and corresponding indoor model tests, theoretical researches and the like are still lagged, so that the urban rail transit is a hot topic in the current engineering community. On the other hand, the current subway operation full scale model has high simulation difficulty and high economic cost, the underground structure state is difficult to control effectively, the subway operation vibration simulation under different soil textures is also difficult, the research on the dynamic response characteristic of the surrounding rock under the action of the cyclic vibration load borne by the subway tunnel mainly takes on-site actual measurement, an empirical method and theoretical analysis, and an indoor model test with low economic cost and high reliability is often lacked.
SUMMERY OF THE UTILITY MODEL
For the defect of compensateing prior art and research method, the utility model aims to provide a subway tunnel country rock dynamic response characteristic's under the simulation circulation dynamic load test device, the influence that can comparatively real simulation is subsided the change and is vibrated the peripheral stratum vibration of tunnel by the subway tunnel accumulation that the train long-term operation vibration caused.
In order to achieve the above object, the embodiments of the present invention adopt the following technical solutions:
according to an embodiment provided by the utility model, the utility model provides a subway tunnel surrounding rock dynamic response test device under simulated circulation dynamic load, which comprises a model box, a tunnel model, a guide cylinder, a dynamic loading system, a bearing support structure, dynamic signal monitoring equipment and a control system; the model box is filled with soil, a tunnel model is embedded in the soil, the tunnel model is connected with a power loading system through a guide cylinder, the power loading system is connected with a dynamic signal monitoring device and a control system through an electro-hydraulic servo actuator, and the control system controls the power loading system to load the tunnel model.
The utility model discloses further improvement lies in, the mold box includes the steel sheet base and fixes steel sheet base organic glass board all around and triangle-shaped steel framework constitute inside cavity to fill the soil body in the cavity, bury the tunnel model in the soil body.
The utility model discloses further improvement lies in, be provided with the guide cylinder on the tunnel model, electric liquid servo actuator lower extreme is provided with the power loading pole, and the power loading pole passes in guide cylinder and the tunnel model way bed top and contacts mutually, and power loading pole top links to each other with electric liquid servo actuator.
The utility model discloses further improvement lies in, the guide cylinder outside sets up the rigidity sleeve, and the rigidity sleeve outside contacts with the packing soil body, and inboard and guide cylinder are for having no friction or low friction contact.
The utility model has the further improvement that the power loading system comprises an electro-hydraulic servo actuator, a dynamic load supply device and a bearing support structure; the electro-hydraulic servo actuator is fixed on the bearing support structure, a motor and an oil pressure pump are arranged in the dynamic load supply equipment, the motor is connected with the oil pressure pump, and the oil pressure pump is connected with the electro-hydraulic servo actuator.
The utility model is further improved in that the bearing and supporting structure comprises a rigid bracket, a rigid cross beam and a rigid supporting plate; the rigid supports are two pairs which are vertically and parallelly arranged in a front-back symmetrical mode, the lower ends of the rigid supports are fixed on the steel plate base, and the upper ends of the rigid supports are connected with the rigid supporting plates through rigid cross beams; the rigid support plate is horizontally arranged and can freely adjust the height.
The utility model has the further improvement that the electro-hydraulic servo actuator is arranged on the rigid support plate, and the lower end of the electro-hydraulic servo actuator passes through the rigid support plate; damping materials are attached to the inner surfaces of the steel plate base and the surrounding organic glass plate enclosure structure.
The utility model discloses a further improvement lies in, control system includes the main control system, signal generator and the signal converter of being connected with electro-hydraulic servo actuator respectively.
The utility model discloses further improvement lies in, dynamic signal monitoring facilities is including locating the acceleration sensor in the soil body upper end stratum respectively and locating the laser displacement sensor in the tunnel model.
The beneficial effects of the utility model reside in that:
the utility model discloses the experimental loading device of accessible simulation tunnel accumulation settlement change and the power response of the peripheral soil body under the long-term circulation dynamic load, the value of subsiding carries out real-time dynamic monitoring with power response characteristic accessible dynamic signal monitoring facilities, this testing device is applicable to tunnel country rock dynamic response characteristic under the different tunnel buried depth of simulation, different load form and different soil texture conditions, can provide reliable, convenient test platform for subway tunnel accumulation settlement change and the environmental vibration influence under the train long-term operation vibration.
Drawings
FIG. 1 is a front view of the test apparatus;
FIG. 2 is a side view of the test apparatus;
FIG. 3 is a cross-sectional view (front) of the test apparatus;
FIG. 4 is a cross-sectional view (side) of the test apparatus;
FIG. 5 is a schematic front view of a mold box;
FIG. 6 is a schematic side view of a mold box;
FIG. 7 is a schematic structural view of a tunnel model, a guide cylinder, a power loading rod and a rigid sleeve;
figure 8 is a schematic view of a load bearing support structure.
Description of reference numerals: 1. a steel plate base; 2. a triangular steel frame; 3. an organic glass plate; 4. damping materials; 5. a soil body; 6. a tunnel model; 7. a guide cylinder; 8. a rigid sleeve; 9. an electric motor; 10. An oil pressure pump; 11. a dynamic load supply device; 12. an electro-hydraulic servo actuator; 13. a rigid support; 14. a rigid cross beam; 15. a rigid support plate; 16. a power loading lever; 17. an acceleration sensor; 18. a laser displacement sensor; 19. a signal generator; 20. a signal converter; 21. and a control host.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1-4, a dynamic response test device for subway tunnel surrounding rock under simulated cyclic dynamic load comprises a model box, a tunnel model 6, a guide cylinder 7, a rigid sleeve 8, a dynamic loading system, a bearing support structure, a dynamic signal monitoring device and a control system.
The model box is formed by splicing a steel plate base 1, a triangular steel frame 2 and an organic glass plate 3 through high-strength bolts, as shown in fig. 5 and 6. The model box is filled with soil 5, is equipped with tunnel model 6 in the soil 5, and tunnel model 6 joint sleeve has the rigidity sleeve 8 of guide cylinder 7, and power loading system is connected to guide cylinder 7, and power loading system includes bearing support structure, electro-hydraulic servo actuator 12 and dynamic load supply apparatus 11, and dynamic signal monitoring facilities and control system are connected to electro-hydraulic servo actuator 12. The control system comprises a control host 21, a signal generator 19 and a signal converter 20 which are respectively connected with the electro-hydraulic servo actuator 12, wherein the signal generator 19 and the signal converter 20 provide loading waveforms, loading amplitudes, loading frequencies and loading duration of the electro-hydraulic servo actuator during working, the control host 21 is connected with a power loading system, and the power loading system is in contact with the tunnel model and used for applying loads to the tunnel model.
As shown in fig. 5 and 6, the steel plate base 1 is made of a thin steel plate, the steel plate base 1 is formed by welding i-shaped steel and the thin steel plate, the organic glass plates 3 are arranged on the periphery of the steel plate base 1 to form the enclosure structure, the organic glass plates are assembled by three independent organic glass plates on the front, the rear, the left and the right of the enclosure structure, and the outer sides of the organic glass plates 3 are fixed with the triangular steel frame 2 through high-strength bolts to improve the strength and the overall stability of the enclosure structure. Soil 5 is filled in the model box, and a tunnel model 6 is buried in the soil 5.
Damping shock-absorbing materials 4 are attached to the inner sides of organic glass plates 3 on the periphery of the model box and consist of foam plastic plates with the thickness of 10cm, steel base plates and polystyrene films, and the damping shock-absorbing materials are mainly used for simulating semi-infinite boundaries in actual stratums, reducing the reflection effect of vibration on the model boundaries and improving test precision.
As shown in fig. 7, the tunnel model 6 is made of steel, and the section form and the model geometry are made and selected according to the tunnel section and the model box size requirement in the actual engineering, the utility model discloses the well hypothesis is circular section. The tunnel model is buried in the soil layer in the model box. The tunnel model 6 is provided with the guide cylinder 7, the lower end of the guide cylinder 7 is connected with the tunnel model 6 through bolts, the guide cylinder 7 and the tunnel model form an integral structure, and the settlement change of the tunnel can be reflected through the settlement change of the guide cylinder. The upper end of the guide cylinder 7 is free, so that the tunnel model can bear the load applied by the upper electro-hydraulic servo actuator. The outside of guide cylinder 7 sets up rigid sleeve 8, and rigid sleeve 8 buries underground in soil body 5, and both ends are the free end about rigid sleeve 8, and rigid sleeve 8 and guide cylinder are frictionless or low friction contact for eliminate the frictional resistance influence of the outside soil body to the guide cylinder in the settlement change process of tunnel model.
As shown in fig. 8, in the power loading system, the load-bearing support structure is mainly used to support the electro-hydraulic servo actuator, and is supplemented with a reinforcing mold box. Specifically, the load-bearing support structure comprises a rigid bracket 13, a rigid cross beam 14 and a rigid support plate 15; the rigid supports 13 are two pairs which are symmetrically arranged in a vertical and parallel mode in a front-back mode, the bottom of each rigid support 13 is fixed with the steel plate base through a high-strength bolt, the top of each rigid support 13 is fixed with the rigid cross beam 14 in a front-back mode through the high-strength bolt, the rigid support plates 15 are horizontally welded to the bottoms of the rigid cross beams 14 which are symmetrically arranged on two sides, and the relative distance (namely the arrangement height) between each rigid cross beam 14 and the top of each rigid support 13 can be freely adjusted. The electro-hydraulic servo actuators 12 are disposed above the rigid support plate 15, and the lower ends of the electro-hydraulic servo actuators 12 pass through the rigid support plate 15.
As shown in fig. 4, the dynamic loading rod 16 provides an external load for inducing the settlement change of the tunnel model, the top of the dynamic loading rod 16 is connected with the electro-hydraulic servo actuator 12, and the bottom of the dynamic loading rod extends into the tunnel model 6 through the guide cylinder to be in contact with the surface of the track bed of the tunnel model, so as to transmit the cyclic dynamic load generated by the electro-hydraulic servo actuator 12.
As shown in fig. 3, in the power loading system, the electro-hydraulic servo actuator 12 is fixed on a load-bearing support structure, and the load pressure and the displacement of the cylinder barrel of the actuator are precisely adjusted by a jet pipe type electro-hydraulic servo valve of the electro-hydraulic servo actuator. The motor 9 and the hydraulic pump 10 are provided inside the dynamic load supply device 11. The motor is connected with the oil hydraulic pump through a high-pressure pipeline, the oil hydraulic pump 10 is connected with the electro-hydraulic servo actuator 12 through a high-pressure pipeline, the motor 9 is used for providing power for the oil hydraulic pump 10, the oil hydraulic pump is mainly used for applying pressure to oil, and the oil hydraulic pump pumps the oil to the electro-hydraulic servo actuator 12 through the high-pressure pipeline matched with the oil hydraulic pump so as to achieve a set power loading value. The motor is provided with an air conditioner radiator for discharging heat generated when the motor and the oil hydraulic pump work normally, so that the temperature of the equipment during working is reduced, and the normal working operation of the power loading system is maintained.
The control system comprises a control host 21, wherein the control host 21 is used for setting loading parameters of the electro-hydraulic servo actuator 12, and the loading parameters comprise a load loading waveform, a load loading amplitude, a load loading frequency and a load cyclic loading frequency.
The dynamic signal monitoring device includes a laser displacement sensor 18 (Kenzhi LK-H155) and an acceleration sensor 17(TST120A 500). The laser displacement sensor is used for accurately measuring vertical settlement displacement of the tunnel model under the action of cyclic dynamic load in real time; the parameter performance of the laser displacement sensor of the type is as follows:
(1) measuring range: 80 mm;
(2) linear precision: (± 0.02% f.s. ═ 16 μm);
(3) reproducibility accuracy: 0.25 μm;
(4) sampling frequency: 8 choices of 2.55/5/10/20/100/200/500/1000 mus.
A pair of two laser displacement sensors 18 are symmetrically arranged and fixed in the tunnel model 6, and laser irradiation points are all aligned to the inner side surface of the model box. The acceleration sensor 17 is arranged at the upper end of the soil body 5 and used for dynamically monitoring the acceleration response of the surrounding rock part area outside the tunnel model 6 under the action of circulating dynamic load in real time; the parameter performance of the acceleration sensor of the model is as follows:
(1) measuring range: 10g of a mixture;
(2) frequency response: 0.2-2500 Hz;
(3) axial sensitivity: 500 mV/g;
(4) maximum lateral sensitivity: less than or equal to 5 percent;
(5) noise: < 0.08 mg.
The acceleration sensors 17 are respectively arranged in the peripheral strata of the tunnel model in the model box, only one side can be arranged according to symmetry, and the specific arrangement quantity is determined according to the test measurement range and the precision.
In the test preparation process, collected or prepared soil samples are sequentially filled and compacted from the bottom of the model box upwards in a layered mode, the tunnel model is embedded when the soil layer is filled to a specified height, and then the soil samples are filled and compacted to a preset height continuously. The height of the rigid beam is adjusted, and the electro-hydraulic servo actuator applies pressure to the loading rod through the control system, so that the bottom of the loading rod automatically extends into the tunnel model, and the tunnel model and the external loading rod are in geometric contact.
In the test operation process, the initial load loading amplitude, the load loading frequency and the load cyclic loading frequency are set by the control system, then the test is started, the dynamic load supply equipment receives a signal instruction of the control system, the built-in motor pushes the oil pressure pump to pressurize the oil body, the oil body flows into the hydraulic servo valve through the high-pressure pipeline, the electro-hydraulic servo actuator receives the signal instruction of the control system and then accurately adjusts the load pressure and displacement of the power loading rod through the electro-hydraulic servo valve, and therefore the load generated by the electro-hydraulic servo actuator is accurately transmitted to the interior of the tunnel model through the power loading rod. In the test process, the settlement change of the tunnel model and the vibration response of surrounding soil layers are dynamically monitored in real time through the laser displacement sensor and the acceleration sensor respectively, displacement and acceleration signal values measured in the laser displacement sensor and the acceleration sensor are derived and processed after the test is finished, the influence of a load loading amplitude and a load loading frequency on the test result is analyzed, and finally the dynamic response characteristic of the surrounding rock of the tunnel model under the action of long-term cyclic vibration load is predicted according to the test result.
The present invention is not limited to the above embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some replacements and transformations for some technical features without creative labor according to the disclosed technical contents, and these replacements and transformations are all within the protection scope of the present invention.
Claims (9)
1. A dynamic response test device for subway tunnel surrounding rock under simulated cyclic dynamic load is characterized by comprising a model box, a tunnel model (6), a guide cylinder (7), a dynamic loading system, a bearing support structure, dynamic signal monitoring equipment and a control system; the model box is filled with a soil body (5), a tunnel model (6) is embedded in the soil body, the tunnel model (6) is connected with a power loading system through a guide cylinder (7), the power loading system is connected with a dynamic signal monitoring device and a control system through an electro-hydraulic servo actuator (12), and the control system controls the power loading system to load the tunnel model (6).
2. The subway tunnel surrounding rock dynamic response test device under simulated cyclic dynamic load of claim 1, wherein the model box comprises a steel plate base (1), organic glass plates (3) fixed around the steel plate base (1) and a triangular steel frame (2) to form an internal hollow cavity, a soil body (5) is filled in the cavity, and a tunnel model (6) is embedded in the soil body (5).
3. A subway tunnel surrounding rock dynamic response test device under simulated cyclic dynamic load according to claim 1, wherein a guide cylinder (7) is arranged on the tunnel model (6), a dynamic loading rod (16) is arranged at the lower end of the electro-hydraulic servo actuator (12), the dynamic loading rod (16) penetrates through the guide cylinder (7) to be in contact with the top of a tunnel bed in the tunnel model (6), and the top end of the dynamic loading rod (16) is connected with the electro-hydraulic servo actuator (12).
4. A subway tunnel surrounding rock dynamic response test device under simulated cyclic dynamic load according to claim 3, characterized in that a rigid sleeve (8) is arranged outside the guide cylinder (7), the outer side of the rigid sleeve (8) is in contact with the filled soil body (5), and the inner side of the rigid sleeve is in zero-friction or low-friction contact with the guide cylinder (7).
5. A subway tunnel surrounding rock dynamic response test device under simulated cyclic dynamic load according to claim 1, wherein said dynamic loading system comprises electro-hydraulic servo actuators (12), dynamic load supply equipment (11) and a bearing support structure; the electro-hydraulic servo actuator (12) is fixed on the bearing support structure, the motor (9) and the oil hydraulic pump (10) are arranged in the dynamic load supply device (11), the motor (9) is connected with the oil hydraulic pump (10), and the oil hydraulic pump (10) is connected with the electro-hydraulic servo actuator (12).
6. A subway tunnel surrounding rock dynamic response test device under simulation circulation dynamic load according to claim 5, wherein said load bearing support structure comprises rigid support frame (13), rigid cross beam (14) and rigid support plate (15); the steel plate base is characterized in that the rigid supports (13) are two pairs which are symmetrically arranged in parallel vertically in a front-back mode, the lower ends of the rigid supports (13) are fixed on the steel plate base (1), and the upper ends of the rigid supports (13) are connected with a rigid supporting plate (15) through rigid cross beams (14); the rigid support plate (15) is horizontally arranged and can be freely adjusted in height.
7. A subway tunnel surrounding rock dynamic response test device under simulated cyclic dynamic load according to claim 6, wherein said electro-hydraulic servo actuator (12) is arranged above a rigid support plate (15), the lower end of the electro-hydraulic servo actuator (12) passes through the rigid support plate (15); damping materials (4) are attached to the inner surfaces of the steel plate base (1) and the surrounding organic glass plate (3) enclosing structure.
8. A subway tunnel surrounding rock dynamic response test device under simulated cyclic dynamic load according to claim 1, wherein said control system comprises a control host (21), a signal generator (19) and a signal converter (20) which are respectively connected with the electro-hydraulic servo actuator (12).
9. A simulated cyclic dynamic load subway tunnel surrounding rock dynamic response test device according to claim 1, wherein said dynamic signal monitoring equipment comprises an acceleration sensor (17) and a laser displacement sensor (18) respectively arranged in the stratum at the upper end of the soil body (5) and in the tunnel model (6).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117071521A (en) * | 2023-06-13 | 2023-11-17 | 重庆交通大学 | Intelligent loading test system and method for ship lock gate structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117071521A (en) * | 2023-06-13 | 2023-11-17 | 重庆交通大学 | Intelligent loading test system and method for ship lock gate structure |
| CN117071521B (en) * | 2023-06-13 | 2024-04-19 | 重庆交通大学 | Intelligent loading test system and method for ship lock gate structure |
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