Rock expansion performance testing device and method based on original geological conditions

Abstract

The invention provides a rock expansion performance testing device and method.The rock expansion performance testing device based on the original geological conditions comprises a testing instrument and a lantern ring assembly, the lantern ring assembly comprises a rigid lantern ring body and a flexible confining pressure unit, and the confining pressure unit is arranged in an inner ring of the lantern ring body; the confining pressure unit is provided with the pressure cavity, a sample is placed in the containing cavity defined by the confining pressure unit, fluid is conveyed into the pressure cavity through the pressure adjusting unit, pressure is applied to the sample in the lateral direction, on one hand, the confining pressure borne by rock under the original geological condition can be simulated, and the result measured in a test room is closer to the real situation; on the other hand, the side swelling amount of the expansive rock sample can be reduced or eliminated, and the accuracy of test results is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of rock swelling test, and particularly relates to a device and method for testing the swelling performance of rocks based on the original geological conditions. Background Technique

[0002] The swelling performance test of rocks is mainly used to study the characteristics of rocks that absorb water or other fluids and then expand in volume under specific conditions. Through this test, the swelling mechanism, swelling degree of rocks, and changes in physical and mechanical properties related to swelling can be understood, and further, the swelling behavior of rocks in a restricted state and its impact on structures or projects can be judged. It is of great significance for evaluating the stability and durability of rocks in underground engineering (such as tunnels, mines, etc.), hydraulic engineering (such as dam foundations, etc.), and other engineering environments in contact with rocks.

[0003] When testing the swelling performance of rocks, it is necessary to first process the rocks into samples with standard shapes and sizes. For engineering investigation and geological exploration, the diameter of the samples used in indoor tests is generally 50 mm, and there are also 75 mm and 90 mm. There is only one standard size of 50 mm for the equipment tooling of soft rock swelling tests on the market. However, limited by the accuracy of core drilling equipment and the special physical and mechanical properties of swelling soft rocks, when preparing rock samples, the diameter size of the obtained swelling rock samples cannot be the size of the specimens required for standard tests, and may be 49.6 mm, 50.5 mm, etc. Therefore, there will be a gap between the sample and the tooling (collar) during the test, and the rock will expand laterally, thus affecting the accuracy of the test data.

[0004] Based on the above technical problems, in order to be able to use the already prepared swelling soft rock core samples indoors and perfectly match them with the tooling (collar) on the test equipment for corresponding physical, mechanical, acoustic, etc. tests, it is very necessary to develop a test equipment for the indoor swelling force and swelling rate of swelling soft rocks to improve the accuracy of test results. Summary of the Invention

[0005] The present invention provides a device and method for testing the swelling performance of rocks based on the original geological conditions, aiming to solve the problem that there is a gap between the swelling rock sample and the tooling due to size deviation.

[0006] To achieve the above object, the technical solution adopted by the present invention is: In the first aspect, the present invention provides a device for testing the swelling performance of rocks based on the original geological conditions, including a test instrument and a collar assembly. The collar assembly includes: A collar body, which is annular; and The confining pressure unit is made of flexible material and has a receiving cavity for receiving a sample. The confining pressure unit is disposed on the inner ring of the collar body. The confining pressure unit has a pressure cavity that surrounds the receiving cavity; and The pressure regulating unit is disposed on one side of the collar body. The output end of the pressure regulating unit is communicated with the pressure cavity for delivering fluid into the pressure cavity.

[0007] In a possible implementation, the confining pressure unit is made of rubber material. The confining pressure unit has a liquid inlet that is communicated with the output end of the pressure regulating unit.

[0008] In a possible implementation, the pressure regulating unit includes: A pressure pump disposed on one side of the collar body; and A delivery pipeline that communicates with the output end of the pressure pump and the pressure cavity. A pressure valve is provided on the delivery pipeline.

[0009] In a possible implementation, the testing instrument includes: A water tank having a water storage cavity with an open top. The collar assembly is configured to be received in the water tank. A permeable cushion layer is provided below the collar assembly; A permeable plate disposed above and / or below the collar assembly; A pressure detection unit disposed above the permeable plate; and A displacement detection unit disposed above the permeable plate.

[0010] In a possible implementation, a support frame is provided on one side of the water tank. An elevating unit is provided on the support frame. The pressure detection unit is connected to the elevating unit.

[0011] In a possible implementation, the displacement detection unit includes: A fixed bracket connected to the water tank and capable of moving up and down relative to the water tank; and A displacement sensor disposed on the fixed bracket and located above the permeable plate.

[0012] In a possible implementation, the testing instrument further includes a water supply unit. The water supply unit includes: A water tank disposed on one side of the water tank; and A water pump. The inlet end of the water pump is communicated with the water tank. The outlet end of the water pump is communicated with the water tank.

[0013] In a possible implementation, a water temperature regulating unit is provided in the water tank.

[0014] In a possible implementation, a liquid level sensor is provided in the water tank.

[0015] Compared with the prior art, the beneficial effects of the rock expansion performance testing device based on the original geological conditions provided by the present invention are as follows: The rock expansion performance testing device based on the original geological conditions provided by the present invention includes a testing instrument and a collar assembly. The collar assembly includes a rigid collar body and a flexible confining pressure unit. The confining pressure unit is arranged in the inner ring of the collar body. The confining pressure unit has a pressure chamber. The sample is placed in the accommodating chamber formed by the confining pressure unit. Fluid is conveyed into the pressure chamber through a pressure regulating unit to apply lateral pressure to the sample. On the one hand, it can simulate the confining pressure that the rock is subjected to under the original geological conditions, making the results measured in the laboratory closer to the real situation. On the other hand, it can reduce or eliminate the lateral expansion amount of the expansive rock sample and improve the accuracy of the test results.

[0016] Second, the present invention provides a method for testing the rock expansion performance based on the original geological conditions, which is characterized in that it is implemented by using the rock expansion performance testing device based on the original geological conditions in any of the above implementation manners, and includes the following steps: Prepare a sample of expansive rock. Wrap a water-permeable membrane around the outer periphery of the sample, place a water-permeable cushion layer below the sample, place a water-permeable plate above the sample, and use a latex membrane collar to wrap the sample, the water-permeable membrane, the water-permeable plate and the water-permeable cushion layer into one body, and use a rubber band to tie and fix both ends of the latex membrane collar. Put the tied sample into the water tank of the testing instrument, add water to the water tank until it reaches the specified liquid level, and convey the required fluid into the pressure chamber of the confining pressure unit through the pressure regulating unit so that the pressure of the fluid acts on the outer peripheral surface of the sample. Place a cushion block above the water-permeable plate at the top, and the pressure detection unit and the displacement detection unit are respectively abutted against the upper surface of the cushion block.

[0017] The method for testing the rock expansion performance based on the original geological conditions provided by the present invention is implemented by using the rock expansion performance testing device based on the original geological conditions in any of the above implementation manners, and has the same technical effects as it, which will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings here are incorporated into the specification and form a part of this specification, showing the embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application.

[0019] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] One or more embodiments are exemplarily illustrated by the pictures in the corresponding drawings. These exemplary illustrations do not limit the embodiments. Elements with the same reference numerals in the drawings represent similar elements. Unless otherwise stated, the drawings in the figures do not constitute a proportional limitation.

[0021] Figure 1 It is a schematic structural diagram of a rock expansion performance testing device based on the original geological conditions provided by the embodiments of the present application; Figure 2 It is a cross-sectional view of the sample of the collar assembly.

[0022] Explanation of reference numerals in the drawings: 10. Collar body; 20. Confining pressure unit; 30. Pressure regulating unit; 31. Pressure pump; 32. Delivery pipeline; 33. Pressure gauge; 40. Water pool; 41. Water storage cavity; 42. Permeable cushion layer; 43. Water temperature regulating unit; 44. Liquid level sensor; 50. Permeable plate; 51. Stainless steel cushion block; 60. Pressure sensor; 70. Displacement detection unit; 71. Fixed bracket; 72. Displacement sensor; 80. Support frame; 81. Lifting unit; 90. Water supply unit; 91. Water tank; 92. Water pump; 100. Latex film sleeve; 101. Kraft hard filter paper; 102. Expansive rock sample. Detailed implementation manners

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts belong to the scope of protection of the present application.

[0024] The following disclosure provides many different embodiments or examples for implementing different structures of the present application. To simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present application. In addition, the present application may repeat reference numerals and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0025] For ease of description, spatial relative relationship terms may be used in the text to describe the relative position relationship or movement of one element or feature shown in the figure with respect to another element or feature. These relative relationship terms are, for example, "inside", "outside", "inner side", "outer side", "below", "beneath", "above", "upper", "front", "rear", etc. Such spatial relative relationship terms are intended to include different orientations of the device during use or operation other than the orientations depicted in the figure. For example, if the device in the figure undergoes a position flip, attitude change, or motion state change, then these directional indications will change accordingly. For example, an element described as "below other elements or features" or "beneath other elements or features" will subsequently be oriented as "above other elements or features" or "upper than other elements or features". Therefore, the exemplary term "below" can include both upper and lower orientations. The device can be oriented otherwise (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used in the text are interpreted accordingly.

[0026] Please refer to Figure 1 and Figure 2 In a first aspect, an embodiment of the present invention provides a rock expansion performance testing device based on original geological conditions, including a testing instrument and a collar assembly. The collar assembly includes a collar body 10, a confining pressure unit 20, and a pressure regulating unit 30. The collar body 10 is annular; the confining pressure unit 20 is made of a flexible material and forms a receiving cavity for receiving a sample. The confining pressure unit 20 is disposed on the inner ring of the collar body 10. The confining pressure unit 20 has a pressure cavity that surrounds the receiving cavity; the pressure regulating unit 30 is disposed on one side of the collar body 10, and the output end of the pressure regulating unit 30 is communicated with the pressure cavity for delivering gas or liquid into the pressure cavity.

[0027] Compared with the prior art, the beneficial effects of the rock expansion performance testing device based on original geological conditions provided by the embodiment of the present invention are: The rock expansion performance testing device based on original geological conditions provided by the embodiment of the present invention includes a testing instrument and a collar assembly. The collar assembly includes a rigid collar body 10 and a flexible confining pressure unit 20. The confining pressure unit 20 is disposed in the inner ring of the collar body 10. The confining pressure unit 20 has a pressure cavity. The sample is placed in the receiving cavity formed by the confining pressure unit 20. Fluid is delivered into the pressure cavity through the pressure regulating unit 30 to apply lateral pressure to the sample. On the one hand, it can simulate the confining pressure received by the rock under the original geological conditions, making the results measured in the laboratory closer to the real situation. On the other hand, it can reduce or eliminate the lateral expansion amount of the expansive rock sample 102 and improve the accuracy of the test results.

[0028] The ferrule body 10 is made of a rigid material such as stainless steel or other metals. The ferrule body 10 can be of an integral structure or a split structure, and its outer shape can be cylindrical, prismatic, etc. As long as it is hollow inside and can accommodate the confining pressure unit 20. Avoidance holes can be provided on the side wall of the ferrule body 10, and the avoidance holes can allow the water delivery hose to pass through, so as to connect the confining pressure unit 20 and the pressure regulating unit 30. When the inner diameter of the expansive rock sample 102 is about 50 mm and the height is 50 mm, the inner diameter of the ferrule body 10 can be 55 mm. When the inner diameter of the expansive rock sample 102 is not 50 mm in diameter, ferrules with different diameters can also be configured to facilitate the placement of the sample. The height of the ferrule body 10 is slightly higher than 50 mm and must be higher than the height of the expansive rock sample 102.

[0029] A layer of annular rubber ferrule is embedded in the inner diameter of the ferrule body 10 and can be fixed by bonding. The annular rubber ferrule forms the above-mentioned confining pressure unit 20. The inside of the annular rubber ferrule is used to fill with water or other fluids, which can prevent the expansive rock sample 102 from expanding laterally and can simulate the pressure exerted on the rock under real geological conditions, killing two birds with one stone.

[0030] Since the material of the ferrule body 10 is a rubber film and it is impermeable to water itself, in order to enable the side of the expansive rock sample 102 to absorb water during the test, the side of the expansive rock sample 102 can be wrapped with kraft hard filter paper 101 or a plastic film with pores. Permeable plates 50 or permeable cushion layers 42 are respectively arranged at the upper and lower ends of the expansive rock sample 102, so that the side, bottom and top of the expansive rock sample 102 can all absorb water.

[0031] Furthermore, a latex film sleeve 100 can also be used to wrap the expansive rock sample 102, the permeable cushion layer 42 / permeable stone, and the kraft hard filter paper 101 / plastic film with pores into one body, and the two ends of the latex film sleeve 100 are fixed and wound tightly with rubber bands to prevent loosening.

[0032] The expansive rock sample 102 generally has a diameter of about 50 mm and a height of about 50 mm. The height is selected to be 50 mm in order to make the expansion rate and expansion force more representative and to unify the sample size standard. For samples that are not 50 mm, it is recommended to prepare them with a diameter-height ratio of 1:1. For example, if the sample diameter is 73.15 mm, the height should be prepared to be 73.15 mm. During the sample preparation process, damage to the sample should be reduced. That is, for re-sampling of large rocks, it can be prepared according to a diameter of 50 mm, and for sampling in the field by drilling, it can be directly prepared into a standard sample according to the diameter of the field sample and the 1:1 preparation standard. In previous studies and tests, the expansion rate test required a height of 50 mm, and the expansion force test required a height of 20 mm, which was obviously easily affected by sample non-uniformity. After setting it to 50 mm, the expansion data will be more representative.

[0033] During the test, in order to keep the volume of the expansive rock sample 102 unchanged and prevent the particles of the expansive rock sample 102 from flowing away, filter paper can be laid on both the top and bottom of the expansive rock sample 102. The filter paper can be in direct contact with the sample, and water can pass through the filter paper and be absorbed by the expansive rock sample 102.

[0034] Please refer to Figure 1 and Figure 2 , in some possible embodiments, the confining pressure unit 20 is made of rubber material. The confining pressure unit 20 has a liquid inlet, and the liquid inlet is communicated with the output end of the pressure regulating unit 30.

[0035] Please refer to Figure 1 , in some possible embodiments, the pressure regulating unit 30 includes a pressure pump 31 and a delivery pipeline 32. The pressure pump 31 is arranged on one side of the collar body 10; the delivery pipeline 32 is communicated with the output end of the pressure pump 31 and the pressure chamber, and a pressure valve is arranged on the delivery pipeline 32 to control the opening and closing of the flow path. The pressure regulating unit 30 can be a liquid pump, and a pressure gauge 33 can be arranged at the water outlet end of the liquid pump to monitor the water pressure.

[0036] Please refer to Figure 1 , in some possible embodiments, the test instrument includes a water tank 40, a permeable plate 50, a pressure detection unit and a displacement detection unit 70. The water tank 40 has a water storage chamber 41, the top of the water storage chamber 41 is open, and the collar assembly is used to be placed in the water tank 40. A permeable cushion layer 42 is arranged below the collar assembly; the permeable plate 50 is arranged above and / or below the collar assembly; the pressure detection unit is arranged above the permeable plate 50; the displacement detection unit 70 is arranged above the permeable plate 50.

[0037] Please refer to Figure 1 , in some possible embodiments, a support frame 80 is arranged on one side of the water tank 40, a lifting unit 81 is arranged on the support frame 80, the lifting unit 81 can specifically be a lifting motor, and the pressure detection unit is connected to the lifting unit 81.

[0038] Please refer to Figure 1 , in some possible embodiments, the displacement detection unit 70 includes a fixed bracket 71 and a displacement sensor 72. The fixed bracket 71 is connected to the water tank 40 and can move up and down relative to the water tank 40 to facilitate flexible adjustment of the installation height of the displacement sensor 72; the displacement sensor 72 is arranged on the fixed bracket 71 and is located above the permeable plate 50, and the axial deformation amount of the expansive rock sample 102 is detected by the displacement sensor 72.

[0039] Please refer to Figure 1In some possible embodiments, the test instrument further includes a water supply unit 90, which includes a water tank 91 and a water pump 92. The water tank 91 is disposed on one side of the water pool 40; the water inlet of the water pump 92 is connected to the water tank 91, and the water outlet of the water pump 92 is connected to the water pool 40. The water in the water tank 91 is transported to the water pool 40 by the water pump 92, and the water level should be higher than the sample and lower than the stainless steel pad 51.

[0040] See also Figure 1 In some possible embodiments, a water temperature regulating unit 43 is provided in the water pool 40 and the water tank 91, which can regulate the water temperature, increase or decrease the temperature of the water, and thus control the temperature of the sample when it expands.

[0041] See also Figure 1 In some possible embodiments, a liquid level sensor 44 is provided in the water pool 40 for monitoring the water level of the water pool 40. When the water level reaches above the minimum water level, the controller controls the water supply unit 90 to stop supplying water. When the water level drops below the minimum water level, the controller controls the water supply unit 90 to supply water into the water pool 40.

[0042] In the second aspect, the present invention provides a method for testing the expansion performance of rocks based on original geological conditions, which is implemented using the rock expansion performance testing device based on original geological conditions in any of the above embodiments, and includes the following steps: preparing a sample of expanded rock; wrapping a permeable membrane around the periphery of the sample, placing a permeable cushion layer 42 under the sample, placing a permeable board 50 above the sample, and using a latex film sleeve 100 ring to wrap the sample, the permeable membrane, the permeable board 50 and the permeable cushion layer 42 as a whole, and using a rubber band to tie and fix the two ends of the latex film sleeve 100 ring; the thickness of the permeable board 50 and the permeable cushion layer 42 can be set to 1 cm high, which can meet the requirements of water penetration and facilitate rubber band tying and fixation.

[0043] Put the bundled sample into the water pool 40 of the test instrument, add water into the water pool 40 until the specified liquid level is reached, and deliver the required fluid to the pressure chamber of the confining pressure unit 20 through the pressure regulating unit 30, so that the pressure of the fluid acts on the outer peripheral surface of the sample; place a cushion block above the permeable plate 50 at the top, and the pressure detection unit and the displacement detection unit 70 are respectively in contact with the upper surface of the cushion block. The expansion force can be obtained from the result measured by the pressure detection unit, and the expansion rate can be calculated from the result measured by the displacement detection unit 70.

[0044] Before the test, the sample needs to be clamped first. Take out the finished expanded rock sample 102, wrap a layer of kraft filter paper 101 of appropriate thickness around the sample, and then put a layer of latex film sleeve 100 on the outer periphery of the kraft filter paper 101. Put a permeable cushion layer 42 / permeable board 50 in the upper and lower positions of the sample respectively. The permeable cushion layer 42 / permeable board 50 is also wrapped in the latex film sleeve 100. Finally, use rubber bands to tie and fix the two ends to prevent the permeable cushion layer 42 / permeable board 50 from falling out from the two ends. The permeable board 50, the permeable cushion layer 42 and the kraft filter paper 101 can enable the expanded rock to absorb water smoothly from the top, bottom and sides.

[0045] The above-mentioned wrapped whole is placed into the ring body 10, the outer surface of the latex membrane sleeve 100 is in contact with the inner surface of the confining pressure unit 20, and the fluid (specifically water) is transported into the pressure chamber through the pressure regulating unit 30, so that the ring body 10, the confining pressure unit 20, the latex membrane sleeve 100, the kraft hard filter paper 101, and the expanded rock sample 102 can be in close contact with each other.

[0046] Then the whole collar assembly and the sample are placed in the water pool 40, the lower part is in good contact with the permeable cushion layer 42 in the water pool 40, and the upper part can be placed with a permeable stone, on which is a stainless steel pad 51, and above which is a pressure sensor 60 and a displacement sensor 72. The displacement sensor 72 indirectly measures the vertical change of the sample by measuring the height change of the pad.

[0047] When conducting the test, the expansion rate can be measured. The specific operation is: after the sample is installed, remove the pressure sensor 60, check the sample and equipment installation again, ensure that the sample, the circular permeable plate 50, and the stainless steel pad 51 are aligned up and down and maintain good contact, and according to the actual confining pressure to which the sample is subjected under the original geological conditions, open the pressure regulating unit 30 and the pressure valve to make the water pressure of the confining pressure unit 20 reach the required test confining pressure.

[0048] When the test temperature needs to be controlled, the temperature in the water pool 40 is set by the water temperature regulating unit 43, and the water temperature is controlled to remain unchanged during the test.

[0049] Turn on the water supply unit 90 and supply water to the pool 40 until the highest water level covers the circular permeable plate 50 and is lower than the upper surface of the stainless steel pad 51. The sample begins to absorb water and expand. The controller automatically records the data of the displacement sensor 72. When the data change of the displacement sensor 72 meets the specification or test requirements, the test is completed. Turn off the relevant equipment and disassemble the equipment, and calculate the expansion rate based on the test results.

[0050] When the expansion force needs to be measured, the sample is installed and placed in the water pool 40 to ensure that the sample, the circular permeable plate 50, the stainless steel pad 51, and the pressure sensor are aligned and in good contact. The servo motor of the lifting unit 81 is turned on to pre-press the sample. Generally, the pre-pressing pressure can be set to 0.01MPa. When the data of the displacement sensor 72 remains unchanged, other settings are made. When it is necessary to consider the expansion force of the sample under a certain vertical stress under the original geological conditions or engineering conditions, the corresponding vertical pressure can be set directly.

[0051] When the confining pressure needs to be set, the pressure pump 31 and the pressure valve are turned on to allow the confining pressure unit 20 to apply the confining pressure to the sample. When the temperature needs to be set, the water temperature in the water pool 40 is controlled by the water temperature regulating unit 43 to keep the water temperature constant during the test.

[0052] Water is supplied to the water pool 40 through the water supply unit 90 until the specified liquid level is reached, and the change data of the expansion force is recorded in real time through the pressure display screen on the controller. In addition, when the displacement sensor 72 is displaced, the servo motor of the lifting unit 81 automatically generates downward pressure to keep the vertical height of the sample unchanged, that is, to press the deformation generated by the displacement sensor 72 back to zero. Repeat the above actions. When the expansion force display remains unchanged or the change meets the specifications or test requirements, the test is completed. Turn off the relevant equipment and disassemble the equipment.

[0053] The rock expansion performance testing method based on original geological conditions provided by the present invention can test the expansion rate and expansion force by using one set of equipment, and has the following advantages: The embodiment of the present invention uses a kraft filter paper 101 and a latex film sleeve 100 to wrap the swellable rock sample 102 laterally, solving the problem that the sample needs to absorb water laterally during the test. The kraft filter paper 101 can be used as a water-permeable layer and a water-passing channel, so that the sample can better achieve real-time lateral water absorption. In addition, the existing water-permeable plates 50 or water-permeable cushion layers 42 arranged at the upper and lower ends of the sample enable the sample to absorb water smoothly in a relatively short time.

[0054] The confining pressure unit 20 is provided in the collar body 10, which can effectively prevent the lateral deformation of the swelling rock sample 102 when the swelling rock sample 102 expands laterally. In addition, the water pressure can be set according to the engineering, geological and actual conditions, and the measured results are more realistic.

[0055] The lifting unit 81 is provided and adjusted by the servo motor in real time with vertical downward pressure, and its precision and accuracy are far superior to the methods specified in the specification. When testing the expansion force, the pressure provided by the servo motor (measured by the pressure sensor 60) is the expansion force of the expansion sample. This method realizes the automation of the equipment and saves a lot of manpower. It can be tested 24 hours a day, avoiding the technicians on duty 24 hours a day, and greatly improving production efficiency.

[0056] The setting of confining pressure and axial pressure has been added. According to the needs of the project, the actual working confining pressure and axial pressure can be set, and then the test can be carried out. This makes the test data more accurate and more in line with the actual geological and engineering conditions. The confining pressure can be set by water pressure, air pressure, oil pressure, etc.

[0057] The automatic addition and extraction of water are realized through the water supply unit 90 and the liquid level sensor 44, which is especially suitable for test scenarios when there is no one on duty for a long time, when the test temperature is high, and when the water consumption is large. It realizes the automation of the equipment and saves a lot of manpower.

[0058] The use of the temperature control system has been added. The temperature in the water tank 40 is adjusted through the water temperature adjustment unit 43 to meet the temperature control when the sample expands. The determination of the expansion properties at different temperatures is realized, which has high scientific research value.

[0059] The diameter size of the collar assembly can be designed to be larger to adapt to samples of various diameter sizes. It can be for samples with a standard diameter of 50 mm or other diameters, eliminating the need for secondary processing of the samples, being simpler and more convenient, and avoiding damage to the samples during the secondary processing process.

[0060] In the above embodiments, the descriptions of each embodiment have their own emphases. For the parts not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0061] In the description of the present application, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0062] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality" means two or more unless otherwise specifically defined.

[0063] In this application, unless otherwise clearly defined or limited, terms such as "installed", "connected", "linked", "fixed", etc. shall be understood in a broad sense. For example, it can be a connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0064] In this application, unless otherwise clearly defined or limited, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than that of the second feature.

[0065] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic expressions of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0066] Obviously, those skilled in the art can make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, provided that these modifications and variations of this application fall within the scope of the claims of this application and their equivalent technologies, this application also intends to include these changes and modifications.

[0067] The above is the specific implementation manner of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art within the technical scope disclosed by this application can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered by the protection scope of this application. Therefore, the protection scope of this application shall be subject to the protection scope of the claims.

Claims

1. A rock expansion performance testing device based on original geological conditions, characterized in that: It comprises a testing instrument and a collar assembly, wherein the collar assembly comprises: The collar body (10) is annular; The confining pressure unit (20) is made of a flexible material and is formed with a receiving cavity, wherein the receiving cavity is used to receive the sample, and the confining pressure unit (20) is arranged on the inner ring of the collar body (10), and the confining pressure unit (20) has a pressure cavity, and the pressure cavity is arranged around the receiving cavity; and A pressure regulating unit (30) is arranged on one side of the collar body (10); an output end of the pressure regulating unit (30) is in communication with the pressure chamber and is used to transport fluid into the pressure chamber.

2. The rock expansion performance testing device based on original geological conditions according to claim 1 is characterized in that: The confining pressure unit (20) is made of a rubber material, and has a liquid inlet, wherein the liquid inlet is connected to an output end of the pressure regulating unit (30).

3. The rock expansion performance testing device based on original geological conditions according to claim 1 is characterized in that: The pressure regulating unit (30) comprises: A pressure pump (31) is disposed on one side of the collar body (10); and The delivery pipeline (32) is connected to the output end of the pressure pump (31) and the pressure chamber, and a pressure valve is provided on the delivery pipeline (32).

4. The rock expansion performance testing device based on original geological conditions according to claim 1 is characterized in that: The testing instrument comprises: A water pool (40) having a water storage cavity (41), wherein the water storage cavity (41) is open at the top, and the collar assembly is used to be accommodated in the water pool (40), and a water-permeable cushion layer (42) is provided below the collar assembly; A water-permeable plate (50) is arranged above and / or below the collar assembly; A pressure detection unit, arranged above the water-permeable plate (50); and The displacement detection unit (70) is arranged above the water-permeable plate (50).

5. A rock expansion performance testing device based on original geological conditions according to claim 4, characterized in that: A support frame (80) is provided on one side of the water pool (40), a lifting unit (81) is provided on the support frame (80), and the pressure detection unit is connected to the lifting unit (81).

6. A rock expansion performance testing device based on original geological conditions according to claim 4, characterized in that: The displacement detection unit (70) comprises: a fixed bracket (71), connected to the water pool (40) and capable of moving up and down relative to the water pool (40); and The displacement sensor (72) is arranged on the fixing bracket (71) and is located above the water-permeable plate (50).

7. A rock expansion performance testing device based on original geological conditions according to claim 4, characterized in that: The testing instrument further comprises a water supply unit (90), wherein the water supply unit (90) comprises: A water tank (91) is disposed on one side of the water pool (40); and A water pump (92), wherein a water inlet end of the water pump (92) is connected to the water tank (91), and a water outlet end of the water pump (92) is connected to the water pool (40).

8. The rock expansion performance testing device based on original geological conditions according to claim 4 is characterized in that: A water temperature regulating unit (43) is provided in the water pool (40).

9. The rock expansion performance testing device based on original geological conditions according to claim 4, characterized in that: A liquid level sensor (44) is provided in the water pool (40).

10. A method for testing rock expansion properties based on original geological conditions, characterized in that: The rock expansion performance testing device based on original geological conditions according to any one of claims 1 to 9 is used to implement the method, comprising the following steps: preparing a sample of expanded rock; A water-permeable film is wrapped around the periphery of the sample, a water-permeable cushion layer (42) is placed below the sample, a water-permeable board (50) is placed above the sample, a latex film sleeve (100) ring is used to wrap the sample, the water-permeable film, the water-permeable board (50) and the water-permeable cushion layer (42) as a whole, and the two ends of the latex film sleeve (100) ring are tied and fixed; The bundled sample ring assembly is placed together in a water pool (40) of a testing instrument, water is added to the water pool (40) until a specified liquid level is reached, and the required fluid is transported to the pressure chamber of the confining pressure unit (20) through the pressure regulating unit (30), so that the pressure of the fluid acts on the outer peripheral surface of the sample; A cushion block is placed above the water-permeable plate (50) located at the top, and the pressure detection unit and the displacement detection unit (70) are respectively in contact with the upper surface of the cushion block.

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