Fractured rock mass grouting simulation device under low temperature-stress coupling effect

Abstract

The utility model discloses a broken rock mass grouting simulation device under a low temperature-stress coupling effect, which comprises a test piece box, a top cover detachably connected to the top of the test piece box, an inner partition plate positioned in the test piece box, and a slurry inlet and a slurry overflow port which are respectively arranged on two opposite side walls of the test piece box and below the inner partition plate, a first flow meter and a second flow meter are respectively arranged on the slurry inlet and the slurry overflow port; the device further comprises a pressurizing assembly and a temperature control assembly. The pressurizing assembly is used for applying a downward load to the inner partition plate; the temperature control assembly is used for providing a low-temperature environment for the test piece box. The utility model provides a fractured rock mass grouting simulation device under a low temperature-stress coupling effect, so as to solve the problem that the prior art cannot meet the experimental research on high-altitude low-temperature and high-ground stress environments, and achieve the purposes of simulating the low-temperature environment of a high-altitude alpine region and simulating the ground stress effect.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of fissure rock mass grouting reinforcement, in particular to a broken rock mass grouting simulation device under low temperature-stress coupling. BACKGROUND

[0002] In the process of underground engineering construction, grouting technology is usually used to reinforce and treat broken surrounding rock. In the process of tunnel surrounding rock excavation, water gushing, high confining pressure, high temperature, high altitude, low temperature and other working conditions may be encountered. For conventional roadway surrounding rock reinforcement, the current experimental technology can meet most of the needs. However, for high-altitude low-temperature and high-ground stress environment, the experimental device in the prior art cannot meet the grouting reinforcement experimental research under such environment. In recent years, a large number of bridge and tunnel projects have developed in complex terrain conditions and high-altitude low-temperature environment, which has brought great obstacles to engineering construction. SUMMARY

[0003] The utility model provides a broken rock mass grouting simulation device under low temperature-stress coupling to solve the problem that the prior art cannot meet the experimental research on high-altitude low-temperature and high-ground stress environment, and achieve the purposes of being able to simulate the low-temperature environment in high-altitude high-cold regions and being able to simulate the ground stress effect.

[0004] The utility model realizes the following technical scheme:

[0005] A broken rock mass grouting simulation device under low temperature-stress coupling, comprising a test piece box, a top cover detachably connected to the top of the test piece box, and an inner partition plate located inside the test piece box, opposite two side walls of the test piece box are respectively provided with a grout inlet and a grout overflow port below the inner partition plate, and a first flow meter and a second flow meter are respectively arranged on the grout inlet and the grout overflow port; further comprising a pressurizing assembly and a temperature control assembly; the pressurizing assembly is used to apply downward load to the inner partition plate; and the temperature control assembly is used to provide a low-temperature environment in the test piece box.

[0006] In view of the problem that the prior art cannot meet the experimental research on high-altitude low-temperature and high-ground stress environment, the utility model provides a broken rock mass grouting simulation device under low temperature-stress coupling. The inner partition plate divides the inside of the test piece box into two parts, the area below the inner partition plate is used to fill broken rock mass test pieces, so the grout inlet and the grout overflow port need to be located below the inner partition plate. In specific use, the broken rock mass test pieces are filled in the test piece box, the inner partition plate and the top cover are installed; then the required low-temperature environment is simulated by the temperature control assembly, the ground stress environment is simulated by the pressurizing assembly applying load downward; then the grout inlet is connected with the grouting pipeline, and the grouting experiment can be started, and the data of flow, pressure and temperature during the experiment are recorded.

[0007] It can be seen that the application can effectively simulate the low-temperature operation environment in the alpine region, and can simulate the ground stress effect, which obviously widens the functionality compared with the prior art, and is beneficial to providing experimental support for the experimental research of the bridge and tunnel engineering in the low-temperature environment and the high ground stress environment.

[0008] Further, the pressurizing assembly comprises a pressurizing air pump located outside the test piece box, an air inlet arranged on the top cover, and a gas conveying pipe connected between the output end of the pressurizing air pump and the air inlet.

[0009] In the scheme, the pressurizing air pump is started, air is supplied through the gas conveying pipe, high-pressure gas enters the inside of the test piece box through the air inlet, and the loading of the inner partition plate can be realized; this pressurizing mode is simple and convenient, and the air pressure can be converted into pressure, which is beneficial to flexibly simulating the ground stress according to the geological exploration data.

[0010] Further, a pressure gauge and a pressure regulating valve are installed on the gas conveying pipe; the pressure inside the test piece box can be flexibly adjusted and read.

[0011] Further, a pressure relief valve is arranged on the top cover for rapid pressure relief after the experiment is completed.

[0012] Further, a first sealing gasket is arranged between the contact surface of the top cover and the test piece box, and a second sealing gasket is arranged between the contact surface of the inner partition plate and the inner wall of the test piece box; the air tightness during the experiment of the application is ensured by the first sealing gasket and the second sealing gasket, and the pressure is stable; the first sealing gasket can be arranged at the bottom of the top cover and / or the top of the test piece box, and the second sealing gasket can be arranged at the side wall of the inner partition plate and / or the inner wall of the test piece box.

[0013] Further, the temperature control assembly comprises a low-temperature medium circulating device located outside the test piece box, and a circulating channel is arranged on the inner wall of the test piece box, and the two ends of the circulating channel are respectively in communication with the input end and the output end of the low-temperature medium circulating device; in the scheme, the low-temperature medium circulates in the low-temperature medium circulating device and the circulating channel, so as to regulate the temperature inside the test piece box and simulate the required low-temperature environment.

[0014] Further, the output end of the low-temperature medium circulating device is connected with one end of the circulating channel through a first conveying pipeline, and the output end of the low-temperature medium circulating device is connected with the other end of the circulating channel through a second conveying pipeline; a first stop valve and a second stop valve are respectively arranged on the first conveying pipeline and the second conveying pipeline.

[0015] The scheme can provide a complete circulating path for the low-temperature medium, and the corresponding stop valve can be closed according to the need, so as to avoid foreign matters from entering the circulating channel when the low-temperature environment is not needed.

[0016] Further, the low-temperature medium circulation device has low-temperature medium and a delivery pump, an output end of the delivery pump is connected with the first delivery pipeline; and an input refrigeration device for cooling the low-temperature medium is further arranged.

[0017] In the scheme, the low-temperature medium is cooled by the input refrigeration device, and the low-temperature medium is pumped to the first delivery pipeline by the delivery pump.

[0018] Further, the first pressure sensor is adjacent to the pulp inlet, and the second pressure sensor is adjacent to the pulp overflow port.

[0019] The first pressure sensor and the second pressure sensor are arranged to monitor the pressures near the pulp inlet and the pulp overflow port in the test piece box, so that more abundant and complete experimental data are obtained for later analysis.

[0020] Further, the top cover and the test piece box are connected by bolts to ensure the stability of the connection during the experiment.

[0021] Compared with the prior art, the utility model has at least the following advantages and beneficial effects:

[0022] 1. The low-temperature-stress coupling effect under the broken rock mass grouting simulation device can effectively simulate the low-temperature operation environment in the alpine region, can simulate the ground stress effect, and compared with the prior art, obviously widens the functionality, and is beneficial to providing experimental support for the experimental research of the bridge tunnel engineering in the low-temperature environment and the high ground stress environment.

[0023] 2. The low-temperature-stress coupling effect under the broken rock mass grouting simulation device can more truly simulate the grouting reinforcement process of the broken rock mass stratum under the engineering environment. DRAWINGS

[0024] The drawings described herein are used to provide further understanding of the embodiments of the utility model, constitute a part of the application, and do not constitute the limitation to the embodiments of the utility model. In the drawings:

[0025] Figure 1 It is the perspective view of the specific embodiment of the utility model;

[0026] Figure 2 It is the sectional view of the specific embodiment of the utility model;

[0027] Figure 3 It is the schematic view of the low-temperature medium circulation device in the specific embodiment of the utility model.

[0028] Markings in the drawings and corresponding names of parts:

[0029] 1-test box;11-pulp inlet;12-pulp overflow;13-first flow meter;14-second flow meter;15-first pressure sensor;16-second pressure sensor;17-circulation channel;171-circulation channel outlet end;172-circulation channel inlet end;173-first temperature sensor;174-second temperature sensor;18-low temperature medium circulation device;181-first transmission pipeline;182-second transmission pipeline;183-first stop valve;184-second stop valve;185-circulation device outlet end;186-circulation device inlet end;187-delivery pump;188-throw-in refrigerator;189-low temperature medium;2-top cover;21-air inlet;22-pressure relief valve;23-bolt;24-pressurized air pump;241-gas conveying pipe;242-pressure gauge;243-pressure regulating valve;25-first gasket;3-inner partition;31-second gasket;4-fractured rock test piece;41-rock block;42-artificial fractured rock;422-rigid gasket. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the following will be further described in detail in combination with examples and drawings. The schematic embodiment and its description of the utility model are only used for explaining the utility model, and are not used as the limitation of the utility model. In the description of the present application, it should be understood that the orientation or position relationship indicated by terms such as 'front', 'back', 'left', 'right', 'up', 'down','vertical', 'horizontal', 'high', 'low', 'inner', 'outer' and the like are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the protection scope of the present application.

[0031] Example 1

[0032] As Figure 1 and Figure 2 shown in a kind of low temperature-stress coupling under fractured rock grouting simulation device, including test box 1, detachably connected in the top cover 2 of test box 1, located in the inner partition 3 of test box 1 inside, the opposite sides of test box 1 are respectively located below the pulp inlet 11 of inner partition 3, pulp overflow 12, first flow meter 13, second flow meter 14 are respectively arranged on pulp inlet 11, pulp overflow 12;It also includes pressurizing assembly, temperature control assembly;The pressurizing assembly is used to apply downward load to inner partition 3;The temperature control assembly is used to provide low temperature environment in test box 1.

[0033] The pressurizing assembly comprises a pressurizing air pump 24 located outside the test piece box 1, an air inlet 21 arranged on the top cover 2, and a gas conveying pipe 241 connected between the output end of the pressurizing air pump 24 and the air inlet 21. A pressure gauge 242 and a pressure regulating valve 243 are arranged on the gas conveying pipe 241. A pressure relief valve 22 is arranged on the top cover 2. A first sealing gasket 25 is arranged between the contact surface of the top cover 2 and the test piece box 1. A second sealing gasket 31 is arranged between the contact surface of the inner partition plate 3 and the inner wall of the test piece box 1.

[0034] In the embodiment, the first pressure sensor 15 is adjacent to the pulp inlet 11, and the second pressure sensor 16 is adjacent to the pulp overflow port 12.

[0035] In the embodiment, the height of the pulp inlet 11 is higher than the height of the pulp overflow port 12.

[0036] Preferably, the first sealing gasket 25 and the second sealing gasket 31 are rubber gaskets.

[0037] Preferably, the distance between the first pressure sensor 15 and the pulp inlet 11 and the distance between the second pressure sensor 16 and the pulp overflow port 12 are not more than a set threshold value, which is preferably 1-3 cm.

[0038] Preferably, a temperature sensing device can be arranged in the test piece box 1 to accurately obtain the internal temperature.

[0039] Preferably, the inner wall of the test piece box 1 is made of a metal material to improve the temperature conduction efficiency.

[0040] Embodiment 2

[0041] A low-temperature-stress coupling rock mass grouting simulation device, based on the device of embodiment 1, as shown in the figure, the temperature control assembly comprises a low-temperature medium circulating device 18 located outside the test piece box 1. The inner wall of the test piece box 1 is provided with a circulating channel 17, and the two ends of the circulating channel 17 are respectively communicated with the input end and the output end of the low-temperature medium circulating device 18. Figures 1 to 3 In the embodiment, the two ends of the circulating channel 17 are defined as the circulating channel inlet end 172 and the circulating channel outlet end 171, the output end of the low-temperature medium circulating device 18 is the circulating device outlet end 185, and the input end of the low-temperature medium circulating device 18 is the circulating device inlet end 186.

[0042]

[0043] ​The outlet end 185 of the circulating device is connected with the inlet end 172 of the circulating channel through a first conveying pipe 181, and the outlet end 171 of the circulating channel is connected with the inlet end 186 of the circulating device through a second conveying pipe 182; the first conveying pipe 181 and the second conveying pipe 182 are respectively provided with a first stop valve 183 and a second stop valve 184.

[0044] The low-temperature medium circulating device 18 is provided with a low-temperature medium 189 and a conveying pump 187, the output end of the conveying pump 187 is connected with the first conveying pipe 181; and the low-temperature medium circulating device 18 further comprises an input refrigeration device 188 for cooling the low-temperature medium 189.

[0045] Preferably, a first temperature sensor 173 and a second temperature sensor 174 are respectively arranged at the outlet end 171 and the inlet end 172 of the circulating channel.

[0046] Preferably, the low-temperature medium 189 is a mixture of water and ethylene glycol.

[0047] Embodiment 3:

[0048] A method for simulating grouting of broken rock mass under low-temperature and stress coupling, which is realized based on the simulation device in Embodiment 1 or 2, and comprises the following steps:

[0049] S1, a broken rock mass test piece 4 is made and placed in a test piece box 1, then an inner partition plate 3 is placed in the test piece box 1, and a top cover 2 is fixed by using a bolt 23;

[0050] S2, a temperature control assembly is started, and is set to a required temperature according to an engineering environment, the first stop valve 183 and the second stop valve 184 are opened, the low-temperature medium 189 is pumped to the circulating channel 17, and a low-temperature environment is simulated;

[0051] S3, a pressurizing air pump 24 is started, and is adjusted to a required pressure through a pressure regulating valve 243 and a pressure gauge 242 according to an engineering environment and geological exploration data, and a ground stress environment is simulated;

[0052] S4, the first pressure sensor 15 and the second pressure sensor 16, the first flow meter 13 and the second flow meter 14, the first temperature sensor 173 and the second temperature sensor 174 are connected with a computer;

[0053] S5, after the grouting inlet 11 is connected with a grouting pipe, grouting experiment can be started, and data such as pressure, slurry flow rate and temperature change in the grouting process are recorded through the computer;

[0054] S6, after grouting is completed, the pressurizing assembly and the temperature control assembly are turned off, the test piece is taken out, and the equipment is cleaned.

[0055] Preferably, the broken rock mass test piece 4 is made by alternately filling the broken rock pieces 41 and the artificial fractured rock mass 42.

[0056] More preferably, the artificial fractured rock mass 42 is made by splicing several cubic rock pieces, and rigid spacers 422 are attached between the adjacent cubic rock pieces to form the fractures of the rock mass test piece.

[0057] The above detailed description is further used to explain the purpose, technical scheme and advantages of the present application, and it should be understood that the above description is only a specific embodiment of the present application, and is not used to limit the protection scope of the present application, and any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application should be included in the protection scope of the present application.

[0058] It should be noted that, in this document, the relationship terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. In addition, the term "connected" used in this document can be directly connected or indirectly connected via other components without special description.

Claims

1. A device for simulating the grouting of fractured rock mass under the coupling of low temperature and stress, characterized in that, The utility model relates to a test piece box, which comprises a test piece box (1), a top cover (2) detachably connected to the top of the test piece box (1), an inner partition plate (3) located inside the test piece box (1), opposite two side walls of the test piece box (1) are respectively provided with a pulp inlet (11) and a pulp overflow port (12) located below the inner partition plate (3), first and second flow meters (13, 14) are respectively arranged on the pulp inlet (11) and the pulp overflow port (12); the utility model further comprises a pressurizing assembly and a temperature control assembly; the pressurizing assembly is used for applying a downward load to the inner partition plate (3); and the temperature control assembly is used for providing a low-temperature environment in the test piece box (1).

2. The device for simulating the grouting of fractured rock mass under the coupling of low temperature and stress according to claim 1, characterized in that, The pressurizing assembly comprises a pressurizing air pump (24) located outside the test piece box (1), an air inlet (21) arranged on the top cover (2), and a gas conveying pipe (241) connected between the output end of the pressurizing air pump (24) and the air inlet (21).

3. The device for simulating the grouting of fractured rock mass under the coupling of low temperature and stress according to claim 2, characterized in that, A pressure gauge (242) and a pressure regulating valve (243) are mounted on the gas conveying pipe (241).

4. The device for simulating the grouting of fractured rock mass under the coupling of low temperature and stress according to claim 2, characterized in that, A pressure relief valve (22) is arranged on the top cover (2).

5. The device for simulating the grouting of fractured rock mass under the coupling of low temperature and stress according to claim 2, characterized in that, First sealing gaskets (25) are arranged between the contact surfaces of the top cover (2) and the test piece box (1); and second sealing gaskets (31) are arranged between the contact surfaces of the inner partition plate (3) and the inner wall of the test piece box (1).

6. The device for simulating the grouting of fractured rock mass under the coupling of low temperature and stress according to claim 1, characterized in that, The temperature control assembly comprises a low-temperature medium circulating device (18) located outside the test piece box (1), and a circulating channel (17) arranged on the inner wall of the test piece box (1), the two ends of the circulating channel (17) are respectively communicated with the input end and the output end of the low-temperature medium circulating device (18).

7. The device for simulating the grouting of fractured rock mass under the coupling of low temperature and stress according to claim 6, characterized in that, The output end of the low-temperature medium circulating device (18) is connected with one end of the circulating channel (17) through a first conveying pipeline (181), and the input end of the low-temperature medium circulating device (18) is connected with the other end of the circulating channel (17) through a second conveying pipeline (182); first and second stop valves (183, 184) are respectively arranged on the first and second conveying pipelines (181, 182).

8. The device for simulating the grouting of fractured rock mass under the coupling of low temperature and stress according to claim 7, characterized in that, The low-temperature medium circulating device (18) contains low-temperature medium (189) and a conveying pump (187), the output end of the conveying pump (187) is connected with the first conveying pipeline (181); and a drop-in refrigerator (188) for cooling the low-temperature medium (189) is further included.

9. The device for simulating the grouting of fractured rock mass under the coupling of low temperature and stress according to claim 1, characterized in that, First and second pressure sensors (15, 16) are arranged on the inner wall of the test piece box (1); the first pressure sensor (15) is adjacent to the pulp inlet (11), and the second pressure sensor (16) is adjacent to the pulp overflow port (12).

10. The device for simulating the grouting of fractured rock mass under the coupling of low temperature and stress according to claim 1, characterized in that, The top cover (2) and the test piece box (1) are connected through bolts (23).

Images