Deep underground structure mixing test device

Abstract

The invention relates to the technical field of underground structure tests, and provides a deep underground structure mixed test device which comprises a model box, a plurality of loading plates, a plurality of drivers and a water pressure loading mechanism. The loading plates are arranged in the model box, each loading plate is parallel to one inner wall of the model box, a containing space is formed among the loading plates, and the containing space is used for containing a rock-soil body-underground structure model; the plurality of drivers are connected with the plurality of loading plates, and the drivers are used for driving the loading plates to move; the water pressure loading mechanism is arranged on the model box and communicated with the model box, and the water pressure loading mechanism is used for injecting water into the model box and adjusting the pressure of a water body in the model box. According to the deep underground structure mixing test device, by arranging the drivers and the water pressure loading mechanisms, the high soil pressure and high water pressure occurrence environment of deep underground soil can be simulated, and important scientific support is provided for safe development of deep underground space and disaster prevention and control.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of underground structure test, in particular to a deep underground structure mixed test device. BACKGROUND

[0002] At present, underground space mainly concentrates on shallow and medium strata of 0-40m, with the saturation of this part of space resources, future urban underground space development will be deep into 40-100m deep strata, becoming the main battlefield of new urbanization construction in super large cities. Unlike shallow underground space, deep underground space faces the extreme occurrence environment of "high soil pressure and high water pressure", and the rock-soil mass-underground structure faces complex interaction under static / dynamic disturbance, which will face more unprecedented challenges in engineering construction and structure safety.

[0003] At present, the instruments and equipment used in the research on the mechanical response law of underground structure under static / dynamic disturbance at home and abroad mainly include pseudo-static test device, constant gravity shaking table test device, centrifuge shaking table test device, etc. However, the pseudo-static test device mainly simulates the action of earthquake, the disturbance working condition is single, the size of the device equipment is limited, the soil boundary effect is obvious, and it is difficult to accurately reflect the mutual feedback effect of rock-soil mass-underground structure. At the same time, the pseudo-static test device cannot simulate the occurrence environment of high soil pressure and high water pressure of deep soil, cannot reflect the dynamic effect of earthquake, and is difficult to capture the instantaneous dynamic response and inertia effect of deep rock-soil mass-underground structure under the action of earthquake. The constant gravity shaking table test device is limited by the size of the device table and the equipment capacity, the range of rock-soil mass is limited, the boundary effect cannot be avoided, the water pressure of deep soil is determined by the size of the actual model box, and it is difficult to simulate the environment of high soil pressure and high water pressure of deep soil. The centrifuge shaking table test device has large scale of model structure, ignores the detailed structure of the structure, and the size effect is obvious, so it cannot reproduce the whole process of structure damage. In addition, the strong vibration and short duration test characteristics of the centrifuge shaking table test device will amplify the dynamic response of the structure, accelerate the material damage, and increase the uncertainty of nonlinear behavior. Therefore, it is an urgent problem in the industry to provide a new type of deep underground structure mixed test device. SUMMARY

[0004] The present application provides a deep underground structure mixed test device to solve the defect that various instruments in the prior art cannot simulate the occurrence environment of high soil pressure and high water pressure of deep soil.

[0005] The application provides a deep underground structure mixed test device, which comprises a model box, a plurality of loading plates arranged in the model box, each loading plate being arranged in parallel with an inner wall of the model box, a containing space being formed between the plurality of loading plates and used for containing a geotechnical body-underground structure model, a plurality of drivers connected with the plurality of loading plates, the drivers being used for driving the loading plates to move, and a water pressure loading mechanism arranged on the model box and communicated with the model box, the water pressure loading mechanism being used for injecting water into the model box and adjusting the pressure of water in the model box.

[0006] The deep underground structure mixed test device provided by the application further comprises a plurality of first force sensors arranged at the moving end of the driver, the first force sensors being connected with the loading plates, and the first force sensors being used for detecting the loading force of the driver.

[0007] The deep underground structure mixed test device provided by the application further comprises a plurality of first displacement sensors arranged at the fixed end of the driver, the first displacement sensors being used for detecting the first displacement of the moving end of the driver.

[0008] The deep underground structure mixed test device provided by the application further comprises: a processor, the processor being built-in with a mixed test system, the mixed test system comprising a numerical simulation substructure module and a deep soil numerical-physical interaction platform, a control mechanism connected with the processor, the driver and the water pressure loading mechanism, wherein the numerical simulation substructure module is used for outputting the numerical-physical interface mechanical boundary conditions under a plurality of working conditions to the deep soil numerical-physical interaction platform, transmitting the numerical-physical interface mechanical boundary conditions to the control mechanism via the deep soil numerical-physical interaction platform, and loading the numerical-physical interface mechanical boundary conditions to the geotechnical body-underground structure model by the control mechanism, so as to obtain the loading force and measure the first displacement, the control mechanism is further used for feeding back the loading force and the first displacement to the deep soil numerical-physical interaction platform, and the deep soil numerical-physical interaction platform is used for correcting the stiffness of the numerical simulation substructure module based on the loading force and the first displacement.

[0009] The deep underground structure mixed test device provided by the application, the water pressure loading mechanism comprises a water tank arranged on the model box and communicated with the model box, and a water pressure loader connected with the water tank, the water pressure loader being used for applying pressure to the water tank.

[0010] The water pressure loading mechanism further comprises a second force sensor, the second force sensor is arranged on the water tank, and the second force sensor is used for detecting the pressure of the water tank.

[0011] The water pressure loading mechanism further comprises a second displacement sensor, and the second displacement sensor is used for detecting the second displacement of the water pressure loader.

[0012] The water pressure loading mechanism further comprises a base arranged on the model box, and the water tank and the water pressure loader are arranged on the base; and a support arranged on the base, and the second displacement sensor is arranged on the support.

[0013] The deep underground structure mixed test device further comprises a plurality of force transmission mechanisms, two ends of each force transmission mechanism are connected with the driver and the loading plate respectively, and the force transmission mechanism comprises a guide sleeve embedded in the plate body of the model box, a force transmission rod penetrating through the guide sleeve, two ends of the force transmission rod are connected with the loading plate and the first force sensor respectively, and a sealing ring is sleeved between the force transmission rod and the guide sleeve.

[0014] The deep underground structure mixed test device further comprises a counterforce frame, the counterforce frame is sleeved outside the model box, and the fixed end of the driver is connected with the counterforce frame.

[0015] The deep underground structure mixed test device provided by the application can simulate the high soil pressure and high water pressure environment of deep underground soil, and provides important scientific support for safe development and disaster prevention and control of deep underground space. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the application or prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0017] Figure 1 It is a structural schematic diagram of the deep underground structure mixed test device provided by the application.

[0018] Figure 2 It is Figure 1 a structural schematic diagram of the driver shown in the figure.

[0019] Figure 3 is Figure 1 A structure diagram of a water pressure loading mechanism shown in FIG.

[0020] Figure 4 is Figure 1 A partial enlarged view of A in FIG.

[0021] Reference signs: 10, model box; 20, driver; 21, cylinder; 22, hydraulic rod; 30, loading plate; 40, water pressure loading mechanism; 41, base; 42, water tank; 43, water pressure loader; 44, second force sensor; 45, support; 46, second displacement sensor; 50, force transmission rod; 51, guide sleeve; 52, sealing ring; 60, crossbeam; 70, first force sensor; 80, first displacement sensor; 100, counterforce frame. DETAILED DESCRIPTION

[0022] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described clearly and completely below with reference to the drawings in the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0023] The present application will be described below with reference to the drawings. Figures 1-4 The deep underground structure mixed test device of the present application is described.

[0024] As Figure 1 shown in the embodiments of the present application, the deep underground structure mixed test device comprises a model box 10, a plurality of drivers 20, a plurality of loading plates 30 and a water pressure loading mechanism 40. The plurality of loading plates 30 are arranged in the model box 10, each loading plate 30 is arranged parallel to an inner wall of the model box 10, and the plurality of loading plates 30 surround a containing space for containing a geotechnical body-underground structure model. Each loading plate 30 is connected with the plurality of drivers 20, and when the plurality of drivers 20 act simultaneously, the loading plate 30 can be pushed to move to extrude the geotechnical body-underground structure model to simulate high soil pressure of deep underground soil. The water pressure loading mechanism 40 is arranged on the model box 10 and communicates with the model box 10 to inject water into the model box 10, and the water pressure loading mechanism 40 is also used to adjust the pressure of the water in the model box 10 to simulate high water pressure of deep underground soil. Through the pressure applied by the driver 20 and the water pressure loading mechanism 40, the high soil pressure and high water pressure environment can be simulated, and high soil pressure and high water pressure composite simulation loading can be performed.

[0025] Optionally, in the embodiment of the present application, the number of loading plates 30 can be three or four, that is, at least three sides of the model box 10 are provided with loading plates 30.

[0026] Optionally, in the embodiment of the present application, the driver 20 can be an oil cylinder, an air cylinder, an electric cylinder, a linear motor, etc.

[0027] The deep underground structure mixed test device provided by the embodiment of the present application can simulate the high soil pressure and high water pressure environment of deep underground soil by arranging a plurality of drivers and a water pressure loading mechanism, and provides important scientific support for the safe development and disaster prevention and control of deep underground space.

[0028] As shown in Figure 2 In the embodiment of the present application, the deep underground structure mixed test device further comprises a plurality of first force sensors 70 and a plurality of first displacement sensors 80. In the embodiment, the driver 20 is an oil cylinder, the cylinder body 21 of the oil cylinder is a fixed end, and the hydraulic rod 22 of the oil cylinder is a movable end. In the embodiment, the maximum loading pressure of the vertical oil cylinder is 1.8 MPa, and the maximum loading pressure of the horizontal oil cylinder is 1.3 MPa.

[0029] Each first force sensor 70 is arranged on the hydraulic rod 22 of one driver 20, and the first force sensor 70 is connected with the loading plate 30, for real-time detection of the loading force of the driver 20. The first displacement sensor 80 is arranged on the cylinder body 21 of the oil cylinder, and the first displacement sensor 80 is used for real-time detection of the first displacement of the hydraulic rod 22.

[0030] Further, the deep underground structure mixed test device further comprises a processor and a control mechanism. The control mechanism is connected with the processor, the driver 20 and the water pressure loading mechanism 40. The processor is built-in with a mixed test system, which is used for loading the numerical-physical interface mechanical boundary conditions under a plurality of working conditions to the rock-soil body-underground structure model through the control mechanism, so as to obtain the loading force and the first displacement, and feed back the loading force and the first displacement to the mixed test system.

[0031] Specifically, the mixed test system comprises a numerical simulation substructure module and a deep soil numerical-physical interaction platform. The numerical simulation substructure module can output the numerical-physical interface mechanical boundary conditions under various working conditions to the deep soil numerical-physical interaction platform, and then transmit to the control mechanism by the deep soil numerical-physical interaction platform. The mechanical boundary data fed back by the control mechanism is received by the deep soil numerical-physical interaction platform, the stiffness of the numerical simulation substructure module is corrected, the non-linear iteration is executed to the boundary coordination balance, and this process is repeated at each loading step in the whole test process.

[0032] The deep soil numerical-physical interaction platform is a platform for completing boundary condition conversion and data transmission between a numerical simulation substructure module and a control mechanism. The deep soil numerical-physical interaction platform can realize cross-freedom degree conversion of complex mechanical boundary data and force-displacement real-time stiffness conversion through an embedded algorithm. Specifically, the deep soil numerical-physical interaction platform includes the following parts: data communication software, a cross-freedom degree conversion algorithm and a force-displacement real-time stiffness conversion algorithm. The data communication software is mainly a continuous medium interface multi-channel communication software constructed by OpenFresco and LabVIEW. The cross-freedom degree conversion algorithm is a continuous medium boundary cross-freedom degree interaction algorithm developed based on the methods of static condensation and stress similarity, and can solve the problem of freedom degree difference between a numerical substructure and a physical test boundary. The force-displacement real-time stiffness conversion algorithm develops a force-displacement mixed nonlinear iteration algorithm by referring to the nonlinear iteration algorithms such as Newton method and quasi-Newton method, and can realize force and displacement stiffness conversion based on the real-time stiffness of a test substructure.

[0033] The control mechanism can receive the numerical substructure boundary data transmitted by the deep soil numerical-physical interaction platform, load the boundary conditions on the rock-soil structure model boundary through the control driver 20, and return the loading force detected by the first force sensor 70 and the first displacement detected by the first displacement sensor 80 to the interaction platform. Through programmable control program design, various complex boundary conditions and loading paths can be accurately reproduced.

[0034] Further, in the embodiment of the present application, the control mechanism includes a controller, a servo hydraulic oil station and a servo valve, the servo hydraulic oil station is connected with the driver 20 through the servo valve, the controller is connected with the servo valve, and the controller is used for controlling the opening degree of the servo valve according to the numerical-physical interface mechanical boundary conditions transmitted by the deep soil numerical-physical interaction platform, so as to reproduce the deep soil water-physical interface boundary conditions under various static / dynamic disturbances in the indoor test scene.

[0035] By setting the control mechanism, 36 sets of drivers 20 and their loading plates 30 can be independently loaded with high precision of ±1% of the value of displacement / force, variable speed loading, and various boundary loading control modes of force loading, displacement loading and force-displacement mixed loading. Through controller programming, complex loading paths without impact switching can be designed, which provides hardware support for restoring the complex mechanical boundary conditions of the deep soil water-physical interaction interface in the test scene. At the same time, the programmable control program reserves the data transmission interface of the interaction platform, and has the ability to interact with the deep soil numerical-physical interaction platform for ≥100 degrees of freedom force / displacement loading data.

[0036] As shown in Figure 3 In the embodiment of the present application, the water pressure loading mechanism 40 includes a base 41 arranged on the model box 10.

[0037] As shown in Figure 3 The water pressure loading mechanism 40 further comprises a water tank 42 and a water pressure loader 43. The water tank 42 and the water pressure loader 43 are both arranged on the base 41, and the water tank 42 is in communication with the model tank 10. The water pressure loader 43 is connected with the water tank 42, and is used to apply pressure to the water tank 42.

[0038] Specifically, in the embodiment, the water tank 42 is in communication with the model tank 10, the water pressure in the water tank 42 is controlled by the water pressure loader 43, and then the water pressure in the model tank 10 is controlled based on the Pascal principle. In the embodiment, the water pressure loader 43 can be a servo oil cylinder, and the effective loading range of the water pressure loader 43 is 0.04 MPa to 1.4 MPa, and the control accuracy is ±1% FS. The servo oil cylinder is connected with a servo hydraulic oil station through a servo valve, and a controller is used to control the valve core opening of the servo valve, so as to adjust the pressure of the servo oil cylinder loaded on the water tank 42, and then adjust the water pressure in the model tank 10.

[0039] As shown in Figure 3 The water pressure loading mechanism 40 further comprises a second force sensor 44, which is arranged on the water tank 42 and is used to detect the pressure of the water tank 42.

[0040] As shown in Figure 3 The water pressure loading mechanism 40 further comprises a support 45 and a second displacement sensor 46. The support 45 is arranged on the base 41, and the second displacement sensor 46 is arranged on the support 45 and is used to detect the second displacement of the water pressure loader 43.

[0041] As shown in Figure 1 In the embodiment of the present application, the deep underground structure mixed test device further comprises a counterforce frame 100, which is sleeved outside the model tank 10, and the fixed end of the driver 20 is connected with the counterforce frame 100. Specifically, the cylinder body 21 of the oil cylinder is fixed with the counterforce frame 100 through the cross beam 60. The counterforce frame 100 is used to provide the counterforce required by the driver 20 to ensure the stability and safety of the main body of the deep underground structure mixed test device.

[0042] As shown in Figure 4As shown, in the embodiment of the present application, the deep underground structure mixing test device further comprises a plurality of force transmission mechanisms, two ends of each force transmission mechanism being connected with the driver 20 and the loading plate 30 respectively. Each force transmission mechanism comprises a force transmission rod 50, a guide sleeve 51 and a sealing ring 52. The guide sleeve 51 is embedded in the plate body of the model box 10, the force transmission rod 50 is arranged in the guide sleeve 51, and two ends of the force transmission rod 50 are connected with the loading plate 30 and the first force sensor 70 respectively. The sealing ring 52 is arranged between the guide sleeve 51 and the force transmission rod 50 to achieve the sealed connection between the force transmission rod 50 and the guide sleeve 51, so as to avoid the water flowing from the guide sleeve 51 to the outside of the model box 10 when the loading plate 30 moves, thereby reducing the water pressure in the model box 10.

[0043] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A deep underground structure hybrid test device, characterized in that, include: Model box; Multiple loading plates are disposed inside the model box, each loading plate being arranged parallel to one inner wall of the model box, and the multiple loading plates forming an accommodating space for accommodating the rock and soil-underground structure model; Multiple drivers are connected to multiple loading boards, and the drivers are used to drive the loading boards to move. A water pressure loading mechanism is installed on the model box and communicates with the model box. The water pressure loading mechanism is used to inject water into the model box and adjust the pressure of the water in the model box.

2. The deep underground structure hybrid test device according to claim 1, characterized in that, It also includes multiple first force sensors, which are disposed at the moving end of the driver and connected to the loading plate. The first force sensors are used to detect the loading force of the driver.

3. The deep underground structure hybrid test device according to claim 2, characterized in that, It also includes a plurality of first displacement sensors, which are disposed at the fixed end of the driver and are used to detect the first displacement of the moving end of the driver.

4. The deep underground structure hybrid test device according to claim 3, characterized in that, Also includes: The processor has a built-in hybrid testing system, which includes a numerical simulation substructure module and a deep soil numerical-physical interaction platform. A control mechanism is connected to the processor, the driver, and the water pressure loading mechanism; The numerical simulation substructure module is used to output the mechanical boundary conditions of the digital-physical interface under various working conditions to the deep soil numerical-physical interaction platform, which then transmits them to the control mechanism. The control mechanism loads the load onto the rock-soil-underground structure model to obtain the loading force and measure the first displacement. The control mechanism is also used to feed back the loading force and the first displacement to the deep soil numerical-physical interaction platform, which then corrects the stiffness of the numerical simulation substructure module based on the loading force and the first displacement.

5. The deep underground structure hybrid test device according to claim 1, characterized in that, The water pressure loading mechanism includes: A water tank is installed on the model box and is connected to the model box; A water pressure loader is connected to the water tank and is used to apply pressure to the water tank.

6. The deep underground structure hybrid test device according to claim 5, characterized in that, The water pressure loading mechanism also includes a second force sensor, which is disposed in the water tank and is used to detect the pressure of the water tank.

7. The deep underground structure hybrid test device according to claim 5, characterized in that, The hydraulic loading mechanism also includes a second displacement sensor, which is used to detect the second displacement of the hydraulic loader.

8. The deep underground structure hybrid test device according to claim 7, characterized in that, The water pressure loading mechanism also includes: A base is mounted on the model box, and the water tank and the water pressure loader are mounted on the base; A bracket is mounted on the base, and the second displacement sensor is mounted on the bracket.

9. The deep underground structure hybrid test device according to claim 2, characterized in that, It also includes multiple force transmission mechanisms, each of which is connected at both ends to the driver and the loading plate, respectively. Each force transmission mechanism includes: A guide sleeve is embedded in the plate body of the model box; A force transmission rod passes through the guide sleeve, and its two ends are respectively connected to the loading plate and the first force sensor; A sealing ring is fitted between the force transmission rod and the guide sleeve.

10. The deep underground structure hybrid test device according to claim 1, characterized in that, It also includes a reaction frame, which is sleeved on the outside of the model box, and the fixed end of the driver is connected to the reaction frame.

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