CN112629897A - Model test system for mechanical properties of tunnel lining under action of train pneumatic load - Google Patents
Model test system for mechanical properties of tunnel lining under action of train pneumatic load Download PDFInfo
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- CN112629897A CN112629897A CN202011278662.7A CN202011278662A CN112629897A CN 112629897 A CN112629897 A CN 112629897A CN 202011278662 A CN202011278662 A CN 202011278662A CN 112629897 A CN112629897 A CN 112629897A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
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Abstract
The invention provides a model test system for mechanical properties of a tunnel lining under the action of a train pneumatic load, which belongs to the field of tunnel lining simulation tests and comprises a ground stress field simulation unit, a pneumatic load simulation unit and a temperature field simulation unit; the ground stress field simulation unit is used for simulating applied ground stress on the top and the side of the damaged lining; the top of the pneumatic load simulation unit is provided with a ventilation opening, the pneumatic load simulation unit is used for supporting the lossy lining and covering the lossy lining on the ventilation opening, and the pneumatic load simulation unit simulates the change of the pneumatic load by changing the air pressure of an inner cavity of the pneumatic load simulation unit; the temperature field simulation unit is used for adjusting the temperature of the gas in the pneumatic load simulation unit so as to simulate the temperature field change. The model test system for mechanical properties of the tunnel lining under the action of the pneumatic load of the train can realize continuous pneumatic loading of the destructive lining in different stress fields and different gas temperature fields, and improve the accuracy of a simulation test.
Description
Technical Field
The invention belongs to the technical field of tunnel lining simulation tests, and particularly relates to a model test system for mechanical properties of a tunnel lining under the action of a train pneumatic load.
Background
With the development of high-speed railways in China, the speed of trains is continuously improved, and the influence of pneumatic load on the destructive lining is increasingly greater. The high-speed railway tunnel in China mostly adopts a composite lining structure, and the tunnel of the type is influenced by various factors in the process of construction and use, so that the damage forms such as lining cracking and the like can be inevitably generated. The indoor model test is always an important research means in the field of civil engineering, plays an important role in simulating mechanical properties of lining, mainly takes the influence research of a ground stress field as a main part in a general tunnel lining research test, lacks a device capable of simulating mechanical properties of damaged lining in a multi-field environment, and is not beneficial to comprehensively and reliably evaluating the influence of a natural environment on the damaged lining.
Disclosure of Invention
The invention aims to provide a model test system for mechanical properties of tunnel lining under the action of train pneumatic load, and aims to solve the problem that the reliability of data obtained by simulation is insufficient because a destructive lining cannot be simulated in a multi-field environment in the conventional simulation test device.
In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a tunnel lining mechanical properties's model test system under train aerodynamic load effect, includes:
the ground stress field simulation unit is used for simulating applied ground stress on the top and the side of the lossy lining;
the pneumatic load simulation unit is used for supporting the lossy lining and covering the lossy lining at the ventilating opening, and the pneumatic load simulation unit simulates the change of the pneumatic load by changing the air pressure of an inner cavity of the pneumatic load simulation unit; and
and the temperature field simulation unit is used for adjusting the temperature of the gas in the pneumatic load simulation unit so as to simulate the change of the temperature field.
As another embodiment of the present application, the ground stress field simulation unit includes:
a first bracket; and
and a plurality of shoring members, the plurality of shoring members being connected to the first brackets, respectively, the plurality of shoring members being configured to apply pressure to the lossy lining from a top and a side of the lossy lining, respectively.
As another embodiment of the present application, the shoring member is a hydraulic jack.
As another embodiment of the present application, the pneumatic load simulation unit includes:
a second bracket;
the sealing box is arranged at the upper part of the second support, the ventilation opening is arranged at the top of the sealing box, and the sealing box is used for supporting the lossy lining and covering the lossy lining at the ventilation opening; and
and the air pressure adjusting assembly is communicated with the inner cavity of the seal box and is used for adjusting the air pressure of the inner cavity of the seal box.
As another embodiment of the present application, the air pressure adjusting assembly includes:
the air duct is communicated with the inner cavity of the seal box;
the piston is arranged in the vent pipeline in a sliding mode; and
and the piston driving mechanism is connected to the piston and drives the piston to slide so as to change the air pressure in the inner cavity of the seal box.
As another embodiment of the present application, the piston driving mechanism includes:
a first housing connected to the vent conduit;
the driving motor is fixedly arranged in the first shell; and
and the crank connecting rod structure is respectively connected with the piston and the output shaft of the driving motor.
As another embodiment of the present application, the temperature field simulation unit includes:
the temperature adjusting pipe fitting is arranged in an inner cavity of the pneumatic load simulation unit;
the temperature adjusting device is arranged outside the pneumatic load simulation unit and communicated with the temperature adjusting pipe fitting, and the temperature adjusting device is used for adjusting the temperature of a heat exchange medium in the temperature adjusting pipe fitting.
As another embodiment of the present application, the temperature adjustment device includes a heater and a refrigerator connected in parallel, and one path of the heat exchange medium flowing out of the temperature adjustment pipe is heated by the heater or cooled by the refrigerator and then flows into an inlet of the temperature adjustment pipe.
As another embodiment of this application, the heat exchange medium that the pipe fitting that adjusts the temperature flowed out still has the backward flow extremely another way of the pipe fitting import adjusts the temperature, the exit of the pipe fitting that adjusts the temperature is equipped with the proportion three-way valve, the import department of the pipe fitting that adjusts the temperature is equipped with the blender.
As another embodiment of the present application, the mixer includes:
a second housing;
the inner cavity of the second shell is divided into a first cavity and a second cavity which are vertically distributed, the top of the partition board and the top wall of the second shell are arranged at intervals to form an overflow port communicated with the first cavity and the second cavity, and the bottom of the second cavity is provided with a liquid discharge port communicated with the inlet of the temperature adjusting pipe fitting;
the liquid temperature sensor is arranged at the top of the partition plate and is positioned in the first cavity;
the first pipeline is communicated with the heater or the refrigerator and extends into the first chamber from the bottom of the second shell; and
and the second pipeline is communicated with the outlet of the temperature adjusting pipe fitting and extends into the first chamber from the top of the second shell, and the bottom end of the second pipeline is lower than the top end of the first pipeline.
The model test system for the mechanical properties of the tunnel lining under the action of the train pneumatic load has the advantages that: compared with the prior art, the model test system for the mechanical properties of the tunnel lining under the action of the train pneumatic load applies pressure on the top and the side of the damaged lining through the ground stress field simulation unit so as to simulate the ground stress borne by the top of the tunnel; because the temperature field change of the tunnel mainly comes from the ground surface, and the pneumatic load also influences the lining below the lining, the temperature of the gas in the pneumatic load simulation unit is adjusted through the temperature field adjusting unit to achieve the effect of simulating the temperature field change, meanwhile, the air pressure in the pneumatic load simulation unit changes according to a preset rule, the bottom of the damaged lining can also be directly influenced by the air pressure change through the ventilation opening, and the change of the pneumatic load when a train enters and exits the tunnel can be simulated. The model test system for mechanical properties of tunnel lining under the action of train pneumatic load integrates the adjusting functions of three parameters of a ground stress field, a temperature field and a pneumatic load, can realize continuous pneumatic loading of the destructive lining under different ground stress fields and different gas temperature fields, truly simulates the mechanical properties of the tunnel destructive lining under the action of the pneumatic load, and improves the accuracy of a simulation test.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a model test system for mechanical properties of a tunnel lining under the action of a train pneumatic load according to an embodiment of the present invention;
FIG. 2 is a schematic view of an assembly structure of the seal box and the temperature adjusting pipe in FIG. 1;
FIG. 3 is a sectional view showing an internal structure of the piston driving structure of FIG. 1;
FIG. 4 is a schematic diagram of the operating principle of the temperature field simulation unit according to the second embodiment of the present invention;
FIG. 5 is a schematic view showing the internal structure of the mixer of FIG. 4;
fig. 6 is a schematic modular diagram of a model test system for mechanical properties of a tunnel lining under the action of a train pneumatic load according to a second embodiment of the present invention.
In the figure: 100. a ground stress field simulation unit; 110. a first bracket; 120. a shoring member; 200. a pneumatic load simulation unit; 210. a vent opening; 220. a second bracket; 230. a sealing box; 240. an air duct; 250. a piston; 260. a piston drive mechanism; 261. a first housing; 262. a drive motor; 263. a first link; 264. a second link; 265. a third link; 300. a temperature field simulation unit; 310. a temperature regulating pipe fitting; 320. a heater; 330. a refrigerator; 340. a proportional three-way valve; 350. a mixer; 351. a second housing; 352. a partition plate; 353. a liquid temperature sensor; 354. a first conduit; 355. a second conduit; 356. a first chamber; 357. a second chamber; 358. an overflow port; 359. a liquid discharge port; 360. a liquid pump; 370. a three-way valve; 380. an air temperature sensor; 400. lossy lining; 500. a control unit.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, a model test system for mechanical properties of a tunnel lining under the action of a train pneumatic load according to the present invention will now be described. The model test system for the mechanical properties of the tunnel lining under the action of the train pneumatic load comprises a ground stress field simulation unit 100, a pneumatic load simulation unit 200 and a temperature field simulation unit 300; the ground stress field simulation unit 100 is used to simulate applied ground stress at the top and sides of the lossy lining 400; the top of the pneumatic load simulation unit 200 is provided with a ventilation opening 210, the pneumatic load simulation unit 200 is used for supporting the lossy lining 400 and covering the lossy lining 400 at the ventilation opening 210, and the pneumatic load simulation unit 200 simulates the change of pneumatic load by changing the air pressure of an inner cavity of the pneumatic load simulation unit; the temperature field simulation unit 300 is used to adjust the temperature of the gas inside the pneumatic load simulation unit 200 to simulate the temperature field variation.
Compared with the prior art, the model test system for the mechanical properties of the tunnel lining under the action of the train pneumatic load provided by the invention has the advantages that the ground stress field simulation unit 100 applies pressure on the top and the side of the destructive lining 400 so as to simulate the ground stress borne by the top of the tunnel; because the temperature field change of the tunnel mainly comes from the ground surface, and the pneumatic load also influences the lining below the lining, the temperature of the gas 200 in the pneumatic load simulation unit is adjusted through the temperature field adjusting unit 300 to achieve the effect of simulating the temperature field change, meanwhile, the air pressure in the pneumatic load simulation unit 200 changes according to a preset rule, the bottom of the damaged lining 400 can also be directly influenced by the air pressure change through the ventilation opening 210, and the change of the pneumatic load when a train enters and exits the tunnel can be simulated. The model test system for mechanical properties of tunnel lining under the action of train pneumatic load integrates the adjusting functions of three parameters of a ground stress field, a temperature field and pneumatic load, can realize continuous pneumatic loading of the destructive lining under different stress fields and different gas temperature fields, truly simulates the mechanical properties of the tunnel destructive lining 400 under the action of pneumatic load, explores the mechanical properties of the tunnel destructive lining 400 under the action of repeated pneumatic load, and improves the accuracy of a simulation test.
The air pressure inside the pneumatic load simulation unit 200 is changed according to the air pressure change law generated when the train enters and exits the tunnel. The temperature field adjusting unit 300 can achieve the purpose of increasing or decreasing the temperature of the gas by exchanging heat and convecting heat with the gas inside the pneumatic load simulation unit 200. The mechanical property change of the damaged lining is mainly the expansion and the damage of cracks.
In the present application, the ground stress field simulation unit 100, the pneumatic load simulation unit 200 and the temperature field simulation unit 300 are all in communication connection with the control unit 500 to precisely control the parameter variation of each unit.
As a specific embodiment of the model test system for mechanical properties of a tunnel lining under the action of a train pneumatic load provided by the present invention, please refer to fig. 1, a ground stress field simulation unit 100 includes a first support 110 and a top bracing member 120; the shoring members 120 are provided in plurality, the plurality of shoring members 120 are respectively connected to the first brackets 110, and the plurality of shoring members 120 are used to respectively press the lossy lining 400 from the top and sides of the lossy lining 400. The distribution of the shoring members 120 is set according to simulation requirements, and pressure can be applied to the lossy lining 400 from a plurality of different angles and positions, so that the change of the ground stress field can be more in line with the actual situation, and the accuracy of the simulation result is improved.
As a specific implementation manner of the embodiment of the present invention, in order to ensure the propping strength, the propping member 120 is a hydraulic jack.
As a specific implementation manner of the embodiment of the present invention, referring to fig. 1 to 3, the pneumatic load simulation unit 200 includes a second bracket 220, a seal box 230, and a pneumatic pressure adjustment assembly; seal box 230 is disposed on top of second support 220, vent opening 210 is disposed on top of seal box 230, seal box 230 is configured to support lossy lining 400, and to cover lossy lining 400 at vent opening 210; the air pressure adjusting assembly is in communication with the interior of the seal box 230 and is used to adjust the air pressure within the interior of the seal box 230. The second support 220 can provide reliable support for the seal box 230, ensuring stability of the relative position between the lossy lining 400 and the seal box 230; the seal box 230 can play a role in supporting the damaged lining and can also provide a cavity for changing air pressure, so that the pneumatic load simulation unit 200 is simple and compact in overall structure, small in occupied space and good in test effect.
As a specific implementation manner of the embodiment of the present invention, referring to fig. 1 to 3, the air pressure adjusting assembly includes a vent pipe 240, a piston 250 and a piston driving mechanism 260; the vent pipe 240 is communicated with the inner cavity of the seal box 230; a piston 250 is slidably disposed within the vent conduit 240; the piston driving mechanism 260 is connected to the piston 250 and changes the air pressure of the inner chamber of the hermetic container 230 by driving the piston 250 to slide. The air pressure adjusting assembly is simple in structure through a piston type structure, the piston moves to change the volume of air in the ventilation air channel, so that the air pressure is changed, the air pressure in the sealing box 230 can be flexibly adjusted by controlling the movement of the piston 250, the air does not need to be pumped out or filled in the whole process, the operation is convenient, and the energy consumption is lower.
As a specific implementation manner of the embodiment of the present invention, referring to fig. 1 and fig. 3, the piston driving mechanism 260 includes a first housing 261, a driving motor 262, and a crank-connecting rod structure; the first housing 261 is connected to the vent pipe 240; the driving motor 262 is fixedly arranged in the first shell 261; the crank-connecting rod structure is connected to the output shafts of the piston 250 and the driving motor 262, respectively. The piston driving mechanism 260 is controlled by a motor, the whole structure is simple, the movement of the piston 250 can be effectively controlled, the continuity and flexibility of the movement of the piston are good, the fault is not easy to occur, and various conditions of air pressure change can be accurately and continuously simulated conveniently.
Specifically, referring to fig. 1 and 3, the crank link structure includes a first link 263, a second link 264 and a third link 264, wherein one end of the first link 263 is connected to an output shaft of the driving motor 262, one end of the second link 264 is rotatably connected to the other end of the first link 263, the third link 265 extends into the ventilation duct 240, one end of the third link is connected to the piston 250, and the other end of the third link is rotatably connected to the other end of the second link 264.
As a specific implementation manner of the embodiment of the present invention, referring to fig. 1, fig. 2, fig. 4 and fig. 5, the temperature field simulation unit 300 includes a temperature adjustment pipe 310 and a temperature adjustment device; the temperature regulating pipe 310 is arranged in the inner cavity of the pneumatic load simulation unit 200; the temperature adjusting device is disposed outside the pneumatic load simulation unit 200 and is communicated with the temperature adjusting pipe 310, and the temperature adjusting device is used for adjusting the temperature of the heat exchange medium in the temperature adjusting pipe 310. The temperature field simulation unit 300 has the core component of temperature change arranged in the inner cavity of the pneumatic load simulation unit 200, the structure is reasonable, the heat generated by the temperature adjusting device can not influence the temperature in the pneumatic load simulation unit 200, the installation and wiring are convenient, and the temperature change can be accurately controlled.
It should be noted that an air temperature sensor 380 is arranged in the inner cavity of the pneumatic load simulation unit 200, the air temperature sensor 380 senses the air temperature in the inner cavity of the pneumatic load simulation unit 200 in real time, and the subsequent temperature change is judged according to the temperature data, so that the temperature adjusting device can be controlled to adjust the temperature.
Specifically, the plurality of air temperature sensors 380 can be arranged as required, so as to sense air temperatures at different positions in the inner cavity of the pneumatic load simulation unit 200, and further comprehensively judge the required temperature variation trend according to the temperature variation at different positions, thereby facilitating more accurate simulation of the variation of the temperature field.
Specifically, not shown in the drawings, the temperature adjusting pipe 310 includes a plurality of coil pipes connected in series, and each coil pipe is located at a different height in the sealing box 230, so as to adjust the temperature of the gas at different levels at the same time, thereby increasing the speed and flexibility of temperature adjustment.
Referring to fig. 1, 2, 4 and 5, as a specific implementation manner of the embodiment of the present invention, the temperature adjustment device includes a heater 320 and a refrigerator 330 that are connected in parallel, one path of the heat exchange medium flowing out of the temperature adjustment pipe 310 flows into an inlet of the temperature adjustment pipe 310 after being heated by the heater 320 or cooled by the refrigerator 330, the flowing power source is a liquid pump 360, and a three-way valve 370 is used for controlling the heat exchange medium to flow to the heater 320 or the refrigerator 330. After flowing out of the temperature adjusting pipe 310, the heat exchange medium subjected to heat exchange is heated or cooled as required, so that the temperature adjustment controllability is strong, the overall structure is simple, the temperature adjusting device and the connection structure between the temperature adjusting device and the temperature adjusting pipe 310 can be designed to be compact, excessive heat loss of the heat exchange medium in the flowing process is avoided, the temperature of the heat exchange medium can be accurately controlled, and the reduction of the operation energy consumption of the heater 320 and the refrigerator 330 is facilitated.
Wherein the heater 320 is an electric heater and the refrigerator 330 is a compressor refrigerator.
Referring to fig. 4, as a specific implementation manner of the embodiment of the present invention, the heat exchange medium flowing out of the temperature adjusting pipe 310 further has another path returning to the inlet of the temperature adjusting pipe 310, the flowing power source is a liquid pump 360, a proportional three-way valve 340 is disposed at the outlet of the temperature adjusting pipe 310, and a mixer 350 is disposed at the inlet of the temperature adjusting pipe 310.
In this embodiment, a part of the discharged heat exchange medium is not heated or cooled, and is mixed with another part of the heated or cooled heat exchange medium in the mixer 350, so that the temperature change curve of the heat exchange medium is smoother, the continuity is better, and the situation of sudden temperature change is avoided; meanwhile, the heater 320 or the refrigerator 330 can reduce energy consumption thereof due to acting on relatively less heat exchange medium, which is beneficial to energy saving. The proportional three-way valve 340 is used for adjusting the flow of the two heat exchange media according to the requirement, so that the temperature of the heat exchange media can be more accurately adjusted.
Referring to fig. 5, a mixer 350 includes a second housing 351, a partition 352, a liquid temperature sensor 353, a first pipe 354 and a second pipe 355; the partition 352 divides the inner cavity of the second casing 351 into a first chamber 356 and a second chamber 357 which are distributed vertically, the top of the partition 352 is spaced from the top wall of the second casing 351 to form an overflow port 358 communicating the first chamber 356 with the second chamber 357, and the bottom of the second chamber 357 is provided with a liquid outlet 359 communicating with the inlet of the temperature adjusting pipe 310; the liquid temperature sensor 353 is arranged at the top of the partition 352 and is positioned in the first chamber 356; the first pipe 354 is communicated with the heater 320 or the refrigerator 330, and extends from the bottom of the second housing 351 into the first chamber 356; the second pipe 355 is connected to the outlet of the temperature-adjusting pipe 310 and extends from the top of the second housing 351 into the first chamber 356, and the bottom end of the second pipe 355 is lower than the top end of the first pipe 356.
In this embodiment, the first pipe 354 and the second pipe 355 are arranged oppositely, so that the liquids can be mixed to a certain extent under the action of the opposite impact force, and meanwhile, the overflow port 358 is located at the upper end of the first chamber 356, so that the two paths of liquids can stay in the first chamber 356 for a long enough time, which is beneficial to the sufficient mixing of heat exchange media with different temperatures; when the mixed liquid flows into the overflow port 358, the temperature of the mixed liquid is detected by the liquid temperature sensor 353, and if the temperature of the discharged liquid is not proper, the flow and the temperature of two paths of heat exchange media are regulated by the combined action of the proportional three-way valve 340, the heater 320 and the refrigerator 330; the liquid flowing out through the overflow 358 finally enters the temperature regulating pipe 310 through the liquid discharge port 359.
The first pipeline 354 and the second pipeline 355 are arranged in a manner that two paths of liquid can be more fully mixed in the first cavity 356, and a heat exchange medium with uneven heat dispersion is prevented from entering the temperature regulating pipe 310; and the mixer 350 does not need to have a large liquid capacity and does not affect the continuity of the flow of the heat exchange medium.
Referring to fig. 6, in the present application, the control unit 500 controls the shoring member 120 (hydraulic jack) to apply pressure to the lossy lining 400; the control unit 500 controls the movement of the piston 250 through the driving motor 262, thereby adjusting the air pressure in the seal box 230; the control unit 500 obtains the sensing data of the air temperature sensor 380 and the liquid temperature sensor 353, controls the flow direction and the flow rate of the heat exchange medium in the circulation loop by controlling the proportional three-way valve 340, the three-way valve 370, the heater 320, the refrigerator 330 and the liquid pump 360, and further can adjust the air temperature by controlling the temperature of the heat exchange medium (namely, the air temperature sensor 380 obtains the adjustment target of the heat exchange medium, each component firstly performs certain adjustment according to the target value, then the liquid temperature sensor 353 judges whether the temperature of the heat exchange medium reaches the adjustment target value, if the temperature of the heat exchange medium does not reach the adjustment target value, the operation state of each component needs to be further adjusted, and finally reaches the target value).
The application has the advantages that the structure is simple and compact, the ground stress can be simultaneously applied to the lossy lining 400 in a simulated mode, the temperature field and the pneumatic load can be changed, the mechanical properties of the tunnel lossy lining under the action of the pneumatic load can be truly simulated, the mechanical properties of the tunnel lossy lining under the action of repeated pneumatic load are explored, and the accuracy of a simulation test is improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. Model test system of tunnel lining mechanical properties under train pneumatic load effect, its characterized in that includes:
the ground stress field simulation unit is used for simulating applied ground stress on the top and the side of the lossy lining;
the pneumatic load simulation unit is used for supporting the lossy lining and covering the lossy lining at the ventilating opening, and the pneumatic load simulation unit simulates the change of the pneumatic load by changing the air pressure of an inner cavity of the pneumatic load simulation unit; and
and the temperature field simulation unit is used for adjusting the temperature of the gas in the pneumatic load simulation unit so as to simulate the change of the temperature field.
2. The model test system for mechanical properties of the tunnel lining under the action of the train pneumatic load according to claim 1, wherein the ground stress field simulation unit comprises:
a first bracket; and
and a plurality of shoring members, the plurality of shoring members being connected to the first brackets, respectively, the plurality of shoring members being configured to apply pressure to the lossy lining from a top and a side of the lossy lining, respectively.
3. The model test system for mechanical properties of a tunnel lining under the action of a train pneumatic load as claimed in claim 2, wherein said shoring member is a hydraulic jack.
4. The model test system for mechanical properties of a tunnel lining under the action of a train pneumatic load according to claim 1, wherein the pneumatic load simulation unit comprises:
a second bracket;
the sealing box is arranged at the upper part of the second support, the ventilation opening is arranged at the top of the sealing box, and the sealing box is used for supporting the lossy lining and covering the lossy lining at the ventilation opening; and
and the air pressure adjusting assembly is communicated with the inner cavity of the seal box and is used for adjusting the air pressure of the inner cavity of the seal box.
5. The model test system for mechanical properties of a tunnel lining under the action of a train pneumatic load according to claim 4, wherein the air pressure adjusting assembly comprises:
the air duct is communicated with the inner cavity of the seal box;
the piston is arranged in the vent pipeline in a sliding mode; and
and the piston driving mechanism is connected to the piston and drives the piston to slide so as to change the air pressure in the inner cavity of the seal box.
6. The model test system for mechanical properties of a tunnel lining under a train pneumatic load of claim 5, wherein the piston driving mechanism comprises:
a first housing connected to the vent conduit;
the driving motor is fixedly arranged in the first shell; and
and the crank connecting rod structure is respectively connected with the piston and the output shaft of the driving motor.
7. The model test system for mechanical properties of a tunnel lining under the action of a train pneumatic load according to claim 1, wherein the temperature field simulation unit comprises:
the temperature adjusting pipe fitting is arranged in an inner cavity of the pneumatic load simulation unit;
the temperature adjusting device is arranged outside the pneumatic load simulation unit and communicated with the temperature adjusting pipe fitting, and the temperature adjusting device is used for adjusting the temperature of a heat exchange medium in the temperature adjusting pipe fitting.
8. The model test system for mechanical properties of a tunnel lining under the action of a train aerodynamic load of claim 7, wherein the temperature adjusting device comprises a heater and a refrigerator which are connected in parallel, and one path of the heat exchange medium flowing out of the temperature adjusting pipe is heated by the heater or cooled by the refrigerator and then flows into the inlet of the temperature adjusting pipe.
9. The model test system for mechanical properties of tunnel lining under the action of train pneumatic load of claim 8, wherein the heat exchange medium flowing out of the temperature adjusting pipe further has another path flowing back to the inlet of the temperature adjusting pipe, the outlet of the temperature adjusting pipe is provided with a proportional three-way valve, and the inlet of the temperature adjusting pipe is provided with a mixer.
10. The model test system for mechanical properties of a tunnel lining under a train aerodynamic load of claim 9, wherein the mixer comprises:
a second housing;
the inner cavity of the second shell is divided into a first cavity and a second cavity which are vertically distributed, the top of the partition board and the top wall of the second shell are arranged at intervals to form an overflow port communicated with the first cavity and the second cavity, and the bottom of the second cavity is provided with a liquid discharge port communicated with the inlet of the temperature adjusting pipe fitting;
the liquid temperature sensor is arranged at the top of the partition plate and is positioned in the first cavity;
the first pipeline is communicated with the heater or the refrigerator and extends into the first chamber from the bottom of the second shell; and
and the second pipeline is communicated with the outlet of the temperature adjusting pipe fitting and extends into the first chamber from the top of the second shell, and the bottom end of the second pipeline is lower than the top end of the first pipeline.
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| CN114444229A (en) * | 2022-03-04 | 2022-05-06 | 西南石油大学 | Method for analyzing bearing capacity of pipe section passing through highway |
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