Rock permeability and saturation test device and permeability and saturation test method

Abstract

The present invention discloses a rock permeability saturation test device and a permeability and saturation test method, and relates to the technical field of rock test experimental instruments. A rock permeability saturation test device is used for permeability test and saturation test of rock samples. It comprises: both ends of the accommodating tube are provided with openings. The first piston and the second piston can be movably arranged on the accommodating tube and divide the accommodating tube into a first accommodating section and a second accommodating section, and can both move along the accommodating tube to change the volume of the first accommodating section and the second accommodating section. The two ends of the connecting tube are respectively connected to the first accommodating section and the second accommodating section, and the connecting tube is provided with a first stop valve. The first accommodating section is used to accommodate rock samples. A permeability test method and a saturation test method both adopt the above-mentioned rock permeability saturation test device. The rock permeability saturation test device provided by the present invention can complete two tests, rock permeability test and rock saturation test, and provides convenience for test personnel.

Description

Technical Field

[0001] The invention relates to the technical field of rock test experimental instruments, and in particular to a rock penetration and saturation test device and a penetration and saturation test method. Background Art

[0002] With the increasing advancement of large-scale infrastructure construction and deep resource and energy mining in my country, a series of underground rock projects have emerged, such as transportation tunnels, hydropower underground powerhouses, paint storage depots, and mine tunnels. Reliably obtaining the changes in the water content of the rock mass during the excavation and operation of these projects is an important link to ensure the safety of the project and promote the smooth progress of the project. The permeability coefficient or permeability is an important indicator used to evaluate the ease of flow of fluid saturated in the rock in the pores. At present, there are two main ways to obtain the permeability coefficient: field testing and indoor testing. Since the former is too expensive and difficult to operate, indoor testing is the most commonly used method for testing the permeability characteristics of rock and soil.

[0003] However, the permeability process of rocks often takes a long time, especially for rocks with low permeability. It often takes days or even weeks to conduct permeability tests directly on rocks. Therefore, the commonly used treatment method is to saturate the sample in advance. Conducting permeability tests on saturated samples can effectively shorten the test cycle. At present, the commonly used method in the laboratory is mainly the vacuum saturation method. When using the vacuum saturated sample, the sample is immersed in a vacuum pressure tank and evacuated for at least 4 hours, maintaining 100kPa until no bubbles escape. Since the rock is soaked in water in the pressure tank, whether the gas inside it can be completely discharged has always been questioned by researchers.

[0004] Furthermore, more and more indoor tests need to consider the physical and mechanical properties of rocks in a saturated state. The process of saturating rocks is also the process of rock penetration. However, there is a dominant path for the flow of fluids in rock masses. For saturation tests of rock masses, it is necessary to consider the degree to which the entire sample is filled with fluid. Under the action of gravity, the fluid seeps out of the rock mass through the dominant path, and the results obtained are not representative. Therefore, when saturating rock samples, it is necessary to reduce the influence of the dominant path on the saturation results.

[0005] Therefore, for the current rock saturation-permeability test, a new method is urgently needed that can avoid the influence of the dominant permeability path inside the rock mass and fully saturate the rock sample. Summary of the invention

[0006] The purpose of the present invention is to provide a rock permeability saturation test device, which can complete both permeability test of rock samples and saturation test of rock samples.

[0007] The present invention provides a technical solution:

[0008] The invention discloses a rock permeability saturation test device, which is used for permeability test and saturation test of rock samples.

[0009] The rock permeability saturation test device comprises:

[0010] The accommodating tube has openings at both ends thereof which are communicated with the interior of the accommodating tube.

[0011] A first piston and a second piston, the first piston and the second piston can be movably arranged in the middle of the accommodating tube and divide the accommodating tube into a first accommodating section and a second accommodating section, the first piston and the second piston can move along the extension direction of the accommodating tube to change the volume of the first accommodating section and the second accommodating section.

[0012] A connecting pipe, both ends of which are respectively connected to the middle of the first accommodating section and the second accommodating section, and are connected to the first accommodating section and the second accommodating section, and a first stop valve is provided on the connecting pipe.

[0013] The first accommodating section is used to accommodate the rock sample, and the rock sample is located between the end of the first accommodating section away from the second accommodating section and the end of the connecting pipe connected to the first accommodating section.

[0014] Furthermore, the first piston and the second piston are arranged at an interval, and the first accommodating section is located on a side of the first piston away from the second piston, and the second accommodating section is located on a side of the second piston away from the first piston.

[0015] Furthermore, the rock permeability saturation test device also includes a pressure gauge, which is connected to the second accommodating section and is used to detect and display the pressure of the liquid inside the second accommodating section.

[0016] Furthermore, the rock permeability saturation test device also includes a containing pipe, which is connected to the end of the first accommodating section, and the containing pipe is communicated with the first accommodating section through the opening.

[0017] Furthermore, the rock permeability saturation test device also includes a measuring cylinder, which is connected to the containing tube and is located at one end of the containing tube away from the first containing section, and the extension direction of the measuring cylinder is the same as the extension direction of the containing tube.

[0018] Furthermore, the rock permeability saturation test device also includes a volume body, which is connected to the second accommodating section through a conduit, and a second stop valve is provided on the conduit.

[0019] Compared with the prior art, the rock permeability saturation test device provided by the present invention has the following beneficial effects:

[0020] The rock permeability saturation test device provided by the present invention can provide pressure to the liquid through the piston when placed upright, so that the liquid can quickly penetrate the rock sample, and then quickly complete the permeability test on the rock sample, thereby improving the test rate. In addition, the rock permeability saturation test device can be placed upside down, at this time, the liquid is located below the rock sample, and at the same time, pressure is provided to the liquid through the piston, so that water penetrates into the rock sample under the pressure to achieve complete saturation of the rock, and then the rock sample saturation test can be performed through the device. That is, the present invention provides a rock permeability saturation test device, which can perform both permeability tests and saturation tests on rock samples, and has a simple structure, simple operation, and low cost.

[0021] Another object of the present invention is to provide a permeability test method, which adopts the above-mentioned rock permeability saturation test device.

[0022] The present invention provides a technical solution:

[0023] A permeability test method uses a rock permeability saturation test device. The rock permeability saturation test device includes:

[0024] The accommodating tube has openings at both ends thereof which are communicated with the interior of the accommodating tube.

[0025] A first piston and a second piston, the first piston and the second piston can be movably arranged in the middle of the accommodating tube and divide the accommodating tube into a first accommodating section and a second accommodating section, the first piston and the second piston can move along the extension direction of the accommodating tube to change the volume of the first accommodating section and the second accommodating section.

[0026] A connecting pipe, both ends of which are respectively connected to the middle of the first accommodating section and the second accommodating section, and are connected to the first accommodating section and the second accommodating section, and a first stop valve is provided on the connecting pipe.

[0027] The first accommodating section is used to accommodate the rock sample, and the rock sample is located between the end of the first accommodating section away from the second accommodating section and the end of the connecting pipe connected to the first accommodating section.

[0028] The method comprises:

[0029] The rock permeability saturation test device is placed upright so that the first accommodating section is located below the second accommodating section.

[0030] Put the rock sample into the first accommodating section so that the rock sample is located between the end of the first accommodating section away from the second accommodating section and the end of the connecting pipe connected to the first accommodating section.

[0031] Open the first stop valve and input liquid into the second accommodating section.

[0032] The opening at the end of the second accommodating section is closed, and the second piston is moved upward.

[0033] When a preset amount of liquid is filled into the first accommodating section, the first stop valve is closed and the first piston is moved downward.

[0034] The first piston is continuously moved to keep the pressure of the liquid inside the first accommodating section constant until the dripping speed of the liquid seeping out from below the rock sample remains stable.

[0035] Furthermore, before the step of opening the first stop valve and inputting liquid into the second accommodating section, the method further includes:

[0036] The first piston is moved to be flush with the end of the connecting pipe connected to the first accommodating section.

[0037] Compared with the prior art, the beneficial effects of the permeability test method provided by the present invention are the same as the beneficial effects of the above-mentioned rock permeability saturation test device relative to the prior art, which will not be repeated here.

[0038] Another object of the present invention is to provide a saturation test method, which adopts the above-mentioned rock permeability saturation test device.

[0039] The present invention provides a technical solution:

[0040] A saturation test method uses a rock permeability saturation test device. The rock permeability saturation test device includes:

[0041] The accommodating tube has openings at both ends thereof which are communicated with the interior of the accommodating tube.

[0042] A first piston and a second piston, the first piston and the second piston can be movably arranged in the middle of the accommodating tube and divide the accommodating tube into a first accommodating section and a second accommodating section, the first piston and the second piston can move along the extension direction of the accommodating tube to change the volume of the first accommodating section and the second accommodating section.

[0043] A connecting pipe, both ends of which are respectively connected to the middle of the first accommodating section and the second accommodating section, and are connected to the first accommodating section and the second accommodating section, and a first stop valve is provided on the connecting pipe.

[0044] The first accommodating section is used to accommodate the rock sample, and the rock sample is located between the end of the first accommodating section away from the second accommodating section and the end of the connecting pipe connected to the first accommodating section.

[0045] The method comprises:

[0046] The rock permeability saturation test device is placed upside down so that the first accommodating section is located above the second accommodating section.

[0047] Put the rock sample into the first accommodating section so that the rock sample is located between the end of the first accommodating section away from the second accommodating section and the end of the connecting pipe connected to the first accommodating section.

[0048] Open the first stop valve and input liquid into the second accommodating section.

[0049] The opening at the end of the second accommodating section is closed, and the second piston is moved downward.

[0050] When a preset amount of liquid is filled into the first accommodating section, the first stop valve is closed and the first piston is moved upward.

[0051] The first piston is continuously moved to keep the pressure of the liquid inside the first accommodating section constant until liquid seeps out from above the rock sample.

[0052] Furthermore, before the step of opening the first stop valve and inputting liquid into the second accommodating section, the method further includes:

[0053] The first piston is moved to be flush with the end of the connecting pipe connected to the first accommodating section.

[0054] Compared with the prior art, the beneficial effects of the saturation test method provided by the present invention are the same as the beneficial effects of the above-mentioned rock permeability saturation test device relative to the prior art, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative work.

[0056] Figure 1 A schematic diagram of the structure of a rock permeability saturation test device provided by an embodiment of the present invention;

[0057] Figure 2 A flow chart of a penetration test method provided by an embodiment of the present invention;

[0058] Figure 3 A flow chart of a saturation test method provided by an embodiment of the present invention.

[0059] Icons: 10- rock permeability saturation test device; 11- rock sample; 100- containing tube; 110- first containing section; 120- second containing section; 210- first piston; 220- second piston; 300- connecting tube; 310- first stop valve; 400- pressure gauge; 500- containing tube; 510- measuring cylinder; 600- volume body; 610- conduit; 620- second stop valve. DETAILED DESCRIPTION

[0060] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0061] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0062] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0063] In the description of the present invention, it should be understood that the terms "upper", "lower", "inside", "outside", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the product of the invention is usually placed when in use, or are directions or positional relationships commonly understood by those skilled in the art. These directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0064] Furthermore, the terms “first”, “second”, etc. are merely used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0065] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms such as "setting" and "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0066] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings.

[0067] Example

[0068] See also Figure 1 In this embodiment, a rock permeability and saturation test device 10 is provided, which can be used for permeability test and saturation test of rock sample 11. That is, the rock permeability and saturation test device 10 provided in this embodiment can complete two tests, rock permeability test and rock saturation test, so that the test personnel who perform the rock permeability test and rock saturation test can complete the two tests without changing the test equipment when performing the permeability test and saturation test on the rock sample 11, which provides great convenience for the operators.

[0069] Among them, the rock permeability saturation test device 10 includes a containing tube 100, a first piston 210, a second piston 220, a connecting tube 300, a pressure gauge 400, a containing tube 500, a measuring cylinder 510, a volume body 600, a conduit 610, a first stop valve 310 and a second stop valve 620.

[0070] The interior of the accommodating tube 100 has a space for accommodating liquid and the rock sample 11, and both ends of the accommodating tube 100 are provided with openings connected to the interior space of the accommodating tube 100, that is, the liquid and the rock sample 11 can be placed inside the accommodating tube 100 through the two openings. In this embodiment, the volume body 600 is connected to the accommodating tube 100 through the conduit 610, and the volume body 600, the conduit 610 and the accommodating tube 100 are connected through an opening, and the conduit 610 is provided with a second stop valve 620. The second stop valve 620 can selectively conduct or cut off the conduit 610. The volume body 600 can transport liquid to the accommodating tube 100 through the conduit 610. That is, in this embodiment, when liquid needs to be added to the accommodating tube 100, it is only necessary to open the second stop valve 620, so that the volume body 600 can transport liquid to the accommodating tube 100 through the conduit 610. When there is enough liquid in the accommodating tube 100, it is only necessary to close the second stop valve 620.

[0071] It should be understood that in other embodiments, the volume body 600, the conduit 610 and the second stop valve 620 may be eliminated, and liquid may be input into the accommodating tube 100 in other ways, such as manually conveying liquid into the accommodating tube 100, or conveying liquid into the accommodating tube 100 through an external tool. It should be noted that when the volume body 600, the conduit 610 and the second stop valve 620 are eliminated, a sealing cover needs to be provided to selectively close or open the opening at the end of the accommodating tube 100.

[0072] The first piston 210 and the second piston 220 are both movably disposed on the accommodating tube 100, and the first piston 210 and the second piston 220 divide the accommodating tube 100 into a first accommodating section 110 and a second accommodating section 120. The first accommodating section 110 is located on a side of the first piston 210 away from the second piston 220, and the second accommodating section 120 is located on a side of the second piston 220 away from the first piston 210. The first piston 210 can move along the extension direction of the accommodating tube 100 and change the volume of the first accommodating section 110, and the second piston 220 can move along the extension direction of the accommodating tube 100 and change the volume of the second accommodating section 120.

[0073] Furthermore, in this embodiment, the first piston 210 and the second piston 220 are spaced apart so that when the first piston 210 moves toward the second piston 220, the first piston 210 has a certain amount of free movement space to avoid the first piston 210 directly abutting against the second piston 220, thereby limiting the movement of the first piston 210. At the same time, when the second piston 220 moves toward the first piston 210, the first piston 210 can be prevented from directly abutting against the second piston 220, thereby limiting the movement of the second piston 220.

[0074] Both ends of the connecting pipe 300 are connected to the accommodating pipe 100, and the internal space of the connecting pipe 300 is connected to the internal space of the accommodating pipe 100. Specifically, the two ends of the connecting pipe 300 are respectively connected to the first accommodating section 110 and the second accommodating section 120, so that the first accommodating section 110 can transport liquid to the inside of the second accommodating section 120 through the connecting pipe 300, and the second accommodating section 120 can also transport liquid to the inside of the first accommodating section 110 through the connecting pipe 300. Further, the connecting pipe 300 is provided with a first stop valve 310, so as to control the connection or closing of the connecting pipe 300 through the first stop valve 310.

[0075] It should be noted that, when the rock permeability saturation test device 10 is used normally, the first piston 210 and the second piston 220 are both located between the two ends of the connecting pipe 300 connected to the first accommodating section 110 and the second accommodating section 120. It should be understood that the first piston 210 and the second piston 220 can both move between the end of the first accommodating section 110 and the end of the connecting pipe 300 connected to the first accommodating section 110. At this time, the operation of the first piston 210 and the second piston 220 can be considered as a misoperation. That is, when the rock permeability saturation test device 10 is used for testing, the normal test movement stroke of the first piston 210 and the second piston 220 is between the two ends of the connecting pipe 300.

[0076] It should be noted that, in the present embodiment, one end of the first accommodating section 110 away from the second accommodating section 120 is used to accommodate the rock sample 11, and when the rock sample 11 is accommodated inside the first accommodating section 110, the rock sample 11 is located between the end of the first accommodating section 110 and the end of the connecting pipe 300 connected to the first accommodating section 110, so as to avoid the rock sample 11 blocking the connecting pipe 300.

[0077] In this embodiment, the connecting pipe 300 is in a broken line shape, and the projection of the connecting pipe 300 on the containing pipe 100 is located between the two ends of the connecting pipe 300, which can prevent the accumulation of liquid inside the connecting pipe 300 and facilitate the cleaning and arrangement of the rock permeability saturation test device 10. Specifically, in this embodiment, the connecting pipe 300 is divided into three sections, the ends of two sections are connected to the containing pipe 100 and are perpendicular to the containing pipe 100, and the two ends of the other section are respectively connected to the ends of the above two sections and are parallel to the containing pipe 100. It should be understood that in other embodiments, the connecting pipe 300 can also be in other shapes such as arc or curve.

[0078] The pressure gauge 400 is connected to the first accommodating section 110, and is used to detect and display the pressure of the liquid in the first accommodating section 110. When the rock permeability saturation test device 10 is conducting a test, it is convenient for the experimental operator to control the hydraulic pressure inside the first accommodating section 110, thereby facilitating the effective conduct of the test.

[0079] Furthermore, in the present embodiment, there is a distance between the pressure gauge 400 and the end of the first accommodating section 110 away from the second accommodating section 120, that is, the rock sample 11 can be accommodated by the internal space of the first accommodating section 110 corresponding to the distance formed between the pressure gauge 400 and the end of the first accommodating section 110, thereby preventing the rock sample 11 from affecting the pressure gauge 400 in detecting the internal hydraulic pressure of the first accommodating section 110.

[0080] Further, the containing pipe 500 is connected to the end of the first containing section 110, specifically, the containing pipe 500 is connected to the end of the first containing section 110 away from the second containing section 120. Moreover, in this embodiment, the extending direction of the containing pipe 500 is the same as the extending direction of the containing pipe 100, and the containing pipe 500 is coaxially arranged with the containing pipe 100, so that when the liquid penetrates the rock sample 11, it is received and contained by the containing pipe 500.

[0081] The measuring cylinder 510 is connected to the containing tube 500, and is located at the end of the containing tube 500 away from the first accommodating section 110, so that the liquid entering the containing tube 500 can enter the measuring cylinder 510, and then the seepage rate of the liquid seeping out of the rock sample 11 can be determined by the measuring cylinder 510. The extension direction of the measuring cylinder 510 is the same as the extension direction of the accommodating tube 100, so as to facilitate the measurement of the liquid seepage rate.

[0082] Please refer to Figure 1 and Figure 2 In addition, this embodiment also provides a permeability test method, which uses the above-mentioned rock permeability saturation test device 10.

[0083] Penetration test methods include:

[0084] Step S11 , placing the rock permeability saturation test device 10 upright so that the first accommodating section 110 is located below the second accommodating section 120 .

[0085] It should be noted that, at this time, the second piston 220 is located above the first piston 210 .

[0086] Step S12: placing the rock sample 11 in the first accommodating section 110 , and making the rock sample 11 located between the end of the first accommodating section 110 away from the second accommodating section 120 and the end of the connecting pipe 300 connected to the first accommodating section 110 .

[0087] That is, the rock sample 11 is placed in a designated position to prevent the rock sample 11 from affecting the normal functioning of the pressure gauge 400 and the connecting pipe 300 , thereby enabling the pressure gauge 400 to effectively measure the hydraulic pressure and enabling the connecting pipe 300 to smoothly flow liquid into the first accommodating section 110 .

[0088] In addition, before step S11, a rock sample 11 having the same inner diameter as the first accommodating section 110 is selected and placed in the first accommodating section 110 so that the outer circumferential wall of the rock sample 11 is attached to the inner circumferential wall of the first accommodating section 110, so that the permeability test can be carried out effectively.

[0089] Step S13 , opening the first stop valve 310 , and inputting liquid into the second accommodating section 120 .

[0090] In this embodiment, the second stop valve 620 is opened to allow the liquid inside the volume body 600 to flow into the second accommodating section 120 through the conduit 610. After the liquid flows into the second accommodating section 120, the liquid inside the second accommodating section 120 can flow into the first accommodating section 110 through the connecting pipe 300.

[0091] It should be noted that before step S13, the first piston 210 is moved to be flush with the end of the connecting tube 300 connected to the first accommodating section 110, so as to facilitate sufficient accumulation of liquid inside the second accommodating section 120, and also facilitate the accumulation of liquid inside the first accommodating section 110, avoiding the formation of bubbles inside the first accommodating section 110.

[0092] Step S14, closing the opening at the end of the second accommodating section 120, and moving the second piston 220 upward.

[0093] That is, in this embodiment, when the liquid inside the second accommodating section 120 is full, the liquid inside the first accommodating section 110 is also full. At this time, the second stop valve 620 is closed to achieve the purpose of sealing the opening at the end of the second accommodating section 120.

[0094] It should be understood that in other embodiments, when the volume body 600 is not provided, liquid can be manually added into the second accommodating section 120. When the second accommodating section 120 is full of liquid, the opening on the second accommodating section 120 can be closed.

[0095] After closing the opening of the second accommodating section 120, that is, after closing the second stop valve 620, by moving the second piston 220 upward, the liquid inside the second accommodating section 120 can be pressed into the first accommodating section 110 through the connecting pipe 300 by the second piston 220. At this time, due to the increase of liquid inside the first accommodating section 110, the first piston 210 is driven to move upward at the same time.

[0096] Step S15: After a preset amount of liquid is filled into the first accommodating section 110, the first stop valve 310 is closed and the first piston 210 is moved downward.

[0097] That is, in this embodiment, when the liquid in the first accommodating section 110 is sufficient, the first stop valve 310 is closed to disconnect the communication between the first accommodating section 110 and the second accommodating section 120. It should be noted that the preset amount can be manually controlled by the test operator, and it is only necessary to ensure that the second piston 220 is maintained between the two ends of the connecting pipe 300.

[0098] After closing the first stop valve 310, the first piston 210 is moved downward to provide pressure to the liquid inside the first accommodating section 110, thereby increasing the speed at which the liquid penetrates into the rock sample 11, thereby increasing the rate of the permeability test.

[0099] Step S16, continuously move the first piston 210 and make the pressure of the liquid inside the first accommodating section 110 constant until the water dripping speed below the rock sample 11 remains stable.

[0100] That is, in this embodiment, while the liquid penetrates into the rock sample 11, the liquid inside the first accommodating section 110 will gradually decrease. At this time, the hydraulic pressure of the liquid in the first accommodating section 110 will be in a trend of gradually decreasing. At this time, by continuously moving the first piston 210 downward, the hydraulic pressure inside the first accommodating section 110 can be kept constant, so that the penetration test can be effectively carried out.

[0101] It should be noted that by detecting the hydraulic pressure inside the first accommodating section 110 through the pressure gauge 400 , the hydraulic pressure inside the first accommodating section 110 can be intuitively displayed, thereby facilitating the experiment operator to control the hydraulic pressure inside the first accommodating section 110 .

[0102] In addition, the liquid seeping out of the rock sample 11 can be measured by the measuring cylinder 510 to measure the liquid seepage rate. The stable increase rate of the liquid inside the measuring cylinder 510 indicates that the rate of the seeping liquid is stable.

[0103] It should be noted that if the amount of liquid inside the first accommodating section 110 has been roughly infiltrated and the rate of liquid seepage from the rock sample 11 has not yet stabilized, at this time, by opening the first stop valve 310 and moving the second piston 220 upward, the liquid inside the second accommodating section 120 is replenished into the first accommodating section 110, and it is only necessary to ensure that the liquid pressure provided to the rock sample 11 is stable.

[0104] When the rate of liquid seepage from the rock sample 11 is stable, the permeability test of the rock sample 11 is completed. Further, when the rate of liquid seepage from the rock sample 11 is stable, the amount of liquid collected by the measuring cylinder 510 within the time t is recorded to facilitate calculation of the permeability coefficient of the rock sample 11. The time t can be controlled by the test operator.

[0105] Please join us Figure 1 and Figure 3 In addition, this embodiment also provides a saturation test method, which uses the rock permeability saturation test device 10 provided in this embodiment. The saturation test method includes:

[0106] Step S21 , placing the rock permeability saturation test device 10 upside down so that the first accommodating section 110 is located above the second accommodating section 120 .

[0107] It should be noted that, at this time, the first piston 210 is located above the second piston 220 .

[0108] Step S22 , placing the rock sample 11 into the first accommodating section 110 , and positioning the rock sample 11 between the end of the first accommodating section 110 away from the second accommodating section 120 and the end of the connecting pipe 300 connected to the first accommodating section 110 .

[0109] Step S23 , opening the first stop valve 310 , and inputting liquid into the second accommodating section 120 .

[0110] Step S24, closing the opening at the end of the second accommodating section 120, and moving the second piston 220 downward.

[0111] Step S25: After a preset amount of liquid is filled into the first accommodating section 110, the first stop valve 310 is closed and the first piston 210 is moved upward.

[0112] Step S26, continuously moving the first piston 210 and making the pressure of the liquid inside the first accommodating section 110 constant until liquid seeps out from above the rock sample 11.

[0113] It should be noted that the permeability test method and the saturation test method provided in this embodiment are substantially the same, and the difference is that the operating directions of the first piston 210 and the second piston 220 are reversed. It is worth noting that, although the operating directions of the first piston 210 and the second piston 220 are reversed, the directions in which the first piston 210 and the second piston 220 move relative to the rock sample 11 are the same. Therefore, the saturation test method will not be described in detail here.

[0114] The rock permeability saturation test device 10 provided in this embodiment can provide pressure to the liquid through the piston when placed upright, so that the liquid can quickly penetrate the rock sample 11, and then quickly complete the permeability test of the rock sample 11, thereby improving the test rate. In addition, the rock permeability saturation test device 10 can be placed upside down, so that the liquid is located below the rock sample 11, and at the same time, pressure is provided to the liquid through the piston, so that water penetrates into the rock sample 11 under the action of pressure, and the rock is completely saturated, and then the saturation test of the rock sample 11 can be performed through the device. That is, the present invention provides a rock permeability saturation test device 10, which can perform a permeability test on the rock sample 11 and a saturation test on the rock sample 11 at the same time, and has a simple structure, simple operation, and low cost.

[0115] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A rock permeability saturation test device, used for permeability test and saturation test of rock samples, characterized in that: The rock permeability saturation test device comprises: An accommodating tube, both ends of which are provided with openings communicating with the interior of the accommodating tube; A first piston and a second piston, wherein the first piston and the second piston are both movably disposed in the middle of the accommodating tube and divide the accommodating tube into a first accommodating section and a second accommodating section, and the first piston and the second piston are both movable along the extending direction of the accommodating tube to change the volumes of the first accommodating section and the second accommodating section; A connecting pipe, two ends of which are respectively connected to the middle of the first accommodating section and the second accommodating section, and are in communication with the first accommodating section and the second accommodating section, and a first stop valve is provided on the connecting pipe; The first accommodating section is used to accommodate the rock sample, and the rock sample is located between the end of the first accommodating section away from the second accommodating section and the end of the connecting pipe connected to the first accommodating section; When performing the permeability test method, the rock permeability saturation test device is placed upright so that the first accommodating section is located below the second accommodating section; Putting a rock sample into the first accommodating section so that the rock sample is located between the end of the first accommodating section away from the second accommodating section and the end of the connecting pipe connected to the first accommodating section; Opening the first stop valve and inputting liquid into the second accommodating section; Closing the opening at the end of the second accommodating section and moving the second piston upward; When a preset amount of liquid is filled into the first accommodating section, the first stop valve is closed and the first piston is moved downward; The first piston is continuously moved to keep the pressure of the liquid inside the first accommodating section constant until the dripping speed of the seeping liquid below the rock sample remains stable; When performing the saturation test method, the rock permeability saturation test device is placed upside down so that the first accommodating section is located above the second accommodating section; Putting a rock sample into the first accommodating section so that the rock sample is located between the end of the first accommodating section away from the second accommodating section and the end of the connecting pipe connected to the first accommodating section; Opening the first stop valve and inputting liquid into the second accommodating section; Closing the opening at the end of the second accommodating section and moving the second piston downward; When a preset amount of liquid is filled into the first accommodating section, the first stop valve is closed and the first piston is moved upward; Continuously moving the first piston to keep the pressure of the liquid inside the first accommodating section constant until liquid seeps out from above the rock sample; The first piston and the second piston are spaced apart, and the first accommodating section is located on a side of the first piston away from the second piston, and the second accommodating section is located on a side of the second piston away from the first piston; The rock permeability saturation test device also includes a containing pipe, which is connected to the end of the first accommodating section, and the containing pipe is communicated with the first accommodating section through the opening.

2. The rock permeability saturation test device according to claim 1, characterized in that: The rock permeability saturation test device also includes a pressure gauge, which is connected to the second accommodating section and is used to detect and display the pressure of the liquid inside the second accommodating section.

3. The rock permeability saturation test device according to claim 1, characterized in that: The rock permeability saturation test device also includes a measuring cylinder, which is connected to the containing tube and located at an end of the containing tube away from the first containing section. The extending direction of the measuring cylinder is the same as the extending direction of the containing tube.

4. The rock permeability saturation test device according to claim 1 is characterized in that: The rock permeability saturation test device also includes a volume body, which is connected to the second accommodating section through a conduit, and a second stop valve is provided on the conduit.

5. A penetration test method, characterized in that: The rock permeability saturation test device according to any one of claims 1 to 4 is used, and the method comprises: The rock permeability saturation test device is placed upright so that the first accommodation section is located below the second accommodation section; Putting a rock sample into the first accommodating section so that the rock sample is located between the end of the first accommodating section away from the second accommodating section and the end of the connecting pipe connected to the first accommodating section; Opening the first stop valve and inputting liquid into the second accommodating section; Closing the opening at the end of the second accommodating section and moving the second piston upward; When a preset amount of liquid is filled into the first accommodating section, the first stop valve is closed and the first piston is moved downward; The first piston is continuously moved to keep the pressure of the liquid inside the first accommodating section constant until the dripping speed of the liquid seeping out from below the rock sample remains stable.

6. The penetration test method according to claim 5, characterized in that: Before the step of opening the first stop valve and inputting liquid into the second accommodating section, the method further includes: The first piston is moved to be flush with the end of the connecting pipe connected to the first accommodating section.

7. A saturation test method, characterized in that: The rock permeability saturation test device according to any one of claims 1 to 4 is used, and the method comprises: Placing the rock permeability saturation test device upside down so that the first accommodating section is located above the second accommodating section; Putting a rock sample into the first accommodating section so that the rock sample is located between the end of the first accommodating section away from the second accommodating section and the end of the connecting pipe connected to the first accommodating section; Opening the first stop valve and inputting liquid into the second accommodating section; Closing the opening at the end of the second accommodating section and moving the second piston downward; When a preset amount of liquid is filled into the first accommodating section, the first stop valve is closed and the first piston is moved upward; The first piston is continuously moved to keep the pressure of the liquid inside the first accommodating section constant until liquid seeps out from above the rock sample.

8. The saturation test method according to claim 7, characterized in that: Before the step of opening the first stop valve and inputting liquid into the second accommodating section, the method further includes: The first piston is moved to be flush with the end of the connecting pipe connected to the first accommodating section.

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