Rock free expansion rate testing device

Abstract

The utility model belongs to the technical field of geotechnical engineering testing, and discloses a rock free expansion rate testing device. The testing device mainly comprises a testing box body, a matched box cover, five displacement sensors, four endoscopic high-definition cameras and the like, wherein the five displacement sensors are distributed on the peripheral side walls and the top of the testing box body. According to the device, the radial and vertical deformation values of the sample in the soaking process are measured and obtained through five accurate displacement sensors. Meanwhile, the high-definition camera can be used for observing and recording the phenomena of disintegration, chipping, surface argillization or softening and the like of the sample, so that more comprehensive test data can be provided. In addition, the device is also provided with a temperature control system consisting of a thermocouple, a heating rod and a temperature controller, and a PH detection system consisting of a PH detection probe and a PH detector. The pH value and the temperature can be effectively controlled, the change process of the sample can be effectively recorded, manual work is effectively reduced through automatic control, and the accuracy and the efficiency of the test are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of geotechnical engineering testing, and in particular relates to a rock free expansion rate testing device. Background Art

[0002] In rock mechanics and engineering geology, the free expansion rate of rock is a key indicator that is directly related to the impact of groundwater on rock formations and rock masses, especially during underground engineering excavation. The free expansion rate reflects the degree of expansion of rock without external constraints when it absorbs water or increases in humidity. The main method for measuring this indicator is to observe the radial and axial deformation of standard specimens before and after water ingress, and then calculate its free expansion rate.

[0003] However, in actual testing, existing measurement technologies have some obvious limitations. For example, when conducting rock free expansion rate tests, tap water or distilled water with a pH value of about 7 is generally used as the immersion liquid. However, in real engineering environments, affected by external conditions, the pH value of many water bodies is not fixed. The free expansion rate of rocks will be different in environments with different pH values. Therefore, existing measurement technologies lack the ability to accurately measure and control the pH value of the immersion liquid, which to some extent affects the accuracy of the measurement results.

[0004] In addition, the traditional rock free expansion test device lacks effective monitoring and control means for the changes in water temperature and liquid level during the measurement process. At the same time, some rock samples may disintegrate, fall off, become muddy or soften during long-term immersion. These changes may not only affect the reliability of the test results, but also the existing technology lacks effective means to observe and record these phenomena in a timely manner. Therefore, based on the existing technology, it is necessary to design a new rock free expansion rate measurement device and method to better simulate actual engineering conditions, improve measurement accuracy, and realize effective monitoring and recording of various parameters during the test process. Utility Model Content

[0005] The free expansion rate test device of rock in the prior art cannot measure the pH value of the solution, the temperature and water level are difficult to stabilize, and the sample changes cannot be observed in time. The utility model aims to provide a free expansion rate test device of rock.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a rock free expansion rate test device, comprising a bottom plate, a test box body is arranged on the bottom plate, a box cover is arranged on the test box body, first displacement sensors are distributed around the test box body, a probe of each first displacement sensor passes through the side wall of the test box body and is installed on the bottom plate through an L-shaped plate, a bracket is installed on one of the L-shaped plates through an adjusting bolt, a second displacement sensor is arranged on the bracket, the probe of the second displacement sensor passes through the center of the box cover, a thermocouple, a PH detection probe and a heating rod are respectively embedded in the test box body, four first displacement sensors and second displacement sensors are respectively connected to a computer through a signal line, the thermocouple and the heating rod are respectively connected to a temperature controller through an electric wire to form a temperature control system, the PH detection probe is connected to the PH detector through a data line, a sample is placed in the test box body, and the probes of the four first displacement sensors are respectively in contact with the four side surfaces of the sample through a first metal plate, the probe of the second displacement sensor is in contact with the top surface of the sample through a second metal plate, and a prepared solution is injected into the test box body to completely immerse the sample.

[0007] As a further supplementary explanation of the above technical solution, water-permeable plates are respectively arranged on the top and bottom of the sample, and the second metal plate is located above the water-permeable plate on the top of the sample.

[0008] As a further supplementary explanation of the above technical solution, the areas of the two water-permeable plates and the second metal plate are the same, and are both equal to the area of ​​the test sample.

[0009] As a further supplement to the above technical solution, four endoscopic high-definition cameras are arranged on the box cover. The four endoscopic high-definition cameras are distributed on the four sides of the box cover and are respectively connected to the computer through signal lines. The four endoscopic high-definition cameras are used to record images of disintegration, falling off, surface mud or softening of the sample during immersion, and upload them to the computer for observation by test personnel.

[0010] As a further supplement to the above technical solution, a spirit level is provided on the base plate, and leveling feet are respectively provided at the four corners of the bottom of the base plate. The four leveling feet cooperate with each other according to the bubble position indication of the spirit level to keep the base plate in a horizontal state.

[0011] As a further explanation and limitation of the above technical solution, the box cover is divided into two cover bodies, and the two are assembled together by hinged fasteners. Semicircular mounting holes are respectively provided at the centers of the connecting edges of the two cover bodies for embedding the second displacement sensor.

[0012] As a further supplementary explanation of the above technical solution, a handle is provided on each of the cover bodies to facilitate the test personnel to quickly assemble and disassemble the box cover.

[0013] As a further supplementary explanation of the above technical solution, a liquid injection tube is arranged on the box cover, and a silicone plug is arranged on the liquid injection tube.

[0014] As a further supplementary explanation of the above technical solution, a drain pipe is arranged at the bottom of the test box, and a manual drain valve is installed on the drain pipe.

[0015] As a further explanation and limitation of the above technical solution, the first metal plate and the second metal plate are both thin copper sheets coated with epoxy resin.

[0016] Compared with the prior art, the utility model has the following advantages:

[0017] 1. The utility model uses four first displacement sensors and one second displacement sensor to accurately measure the radial and vertical deformation values ​​of the sample. At the same time, through the endoscope high-definition camera, the test personnel can observe and record the changes of the sample in the immersion process in real time, such as disintegration, block falling, surface mud or softening, etc. These detailed data and image records help to provide more comprehensive test data and enhance the accuracy and reliability of the test.

[0018] 2. The utility model provides water-permeable plates at the top and bottom of the sample, respectively, so that the upper and lower surfaces of the sample can be evenly contacted with the configuration solution during the immersion process, thereby avoiding the deviation of the test results caused by uneven immersion.

[0019] 3. The utility model can ensure that the test box is in a horizontal state through the design of leveling feet and level bubbles on the bottom plate, providing stable conditions for the test. At the same time, the use of temperature control system and PH detector can accurately control the temperature and PH value of the test environment, further ensuring the accuracy and stability of the test.

[0020] 4. The utility model allows testers to adjust test conditions according to different test requirements, such as sample size, shape, immersion time, solution concentration and pH value, etc. In addition, since the test box and box cover can also be made of colorless and transparent inorganic glass, the test process can be visualized, which is convenient for testers to observe and record. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural diagram of the rock free expansion rate test device in the utility model;

[0022] Figure 2 This is a structural diagram of the box cover in the utility model;

[0023] Figure 3 This is an internal schematic diagram of the rock free expansion rate test device in the utility model;

[0024] Figure 4 It is a top view of the rock free expansion rate test device in the utility model;

[0025] Figure 5 This is a schematic diagram of the rock free expansion rate testing device in the utility model.

[0026] In the figure: the bottom plate is 1, the test box body is 2, the box cover is 3, the hinged fastener is 4, the injection pipe is 5, the silicone plug is 6, the discharge pipe is 7, the discharge manual valve is 8, the L-shaped plate is 9, the first displacement sensor is 10, the thermocouple is 11, the PH detection probe is 12, the heating rod is 13, the endoscope high-definition camera is 14, the second displacement sensor is 15, the bracket is 16, the adjusting bolt is 17, the sample is 18, the first metal plate is 19, the second metal plate is 20, the permeable plate is 21, the leveling foot is 22, the spirit level is 23, the handle is 24, the computer is 25, the temperature controller is 27, and the PH detector is 26.

[0027] The box cover includes: a cover body 301 and a semicircular mounting hole 302 . DETAILED DESCRIPTION

[0028] In order to further illustrate the technical solution of the utility model, the following Figures 1 to 5 According to the specific test process and the assembly structure of the device, we further illustrate the utility model through four embodiments. Embodiment 1

[0029] As attached Figure 1 , 3As shown in Figures 4 and 5, a rock free expansion rate test device includes a base plate 1, a test box 2 is arranged on the base plate 1, a drain pipe 7 is arranged at the bottom of the test box 2, a drain manual valve 8 is installed on it, a box cover 3 is arranged on the test box 2, a liquid injection pipe 5 is arranged on the box cover 3, a silicone plug 6 is arranged on it, the box cover 3 is divided into two cover bodies 301, and the two are assembled together by a hinge fastener 4, semicircular mounting holes 302 are respectively arranged at the center of the connecting edges of the two cover bodies 301, and handles 24 are respectively arranged on each of the cover bodies 301, so that the test personnel can quickly assemble and disassemble the box cover 3. First displacement sensors 10 are distributed around the test box 2. The probe of each first displacement sensor 10 passes through the side wall of the test box 2 and is installed on the bottom plate 1 through an L-shaped plate 9. A bracket 16 is installed on one of the L-shaped plates 9 through an adjusting bolt 17. A second displacement sensor 15 is arranged on the bracket 16. The probe of the second displacement sensor 15 passes through the center of the box cover 3. A thermocouple 11, a PH detection probe 12 and a heating rod 13 are respectively embedded in the test box 2. Four first displacement sensors 10 and second displacement sensors 1 5 are connected to the computer 25 through signal lines, the thermocouple 11 and the heating rod 13 are connected to the temperature controller 27 through wires to form a temperature control system, the pH detection probe 12 is connected to the pH detector 26 through a data line, the sample 18 is placed in the test box 2, and the probes of the four first displacement sensors 10 are in contact with the four side surfaces of the sample 18 through the first metal plate 19, the probe of the second displacement sensor 15 is in contact with the top surface of the sample 18 through the second metal plate 20, and the prepared solution is injected into the test box 2 to completely immerse the sample 18. Embodiment 2

[0030] In order to facilitate the observation of test personnel. Figure 1 and 5 As shown, four endoscopic high-definition cameras 14 are arranged on the box cover 3 . The four endoscopic high-definition cameras 14 are distributed on the four sides of the box cover 3 , and are respectively connected to the computer 25 through signal lines. The four endoscopic high-definition cameras 14 are used to record images of the sample 18 during the immersion period, such as disintegration, falling pieces, muddling or softening of the surface, and upload the images to the computer 25 . Embodiment 3

[0031] In order to ensure that the upper and lower sides of the sample are evenly immersed, so that the test results are not affected. Figure 3As shown, we set water-permeable plates 21 at the top and bottom of the sample 18, respectively, and the second metal plate 20 is located above the water-permeable plate 21 at the top of the sample 18. The two water-permeable plates 21 and the second metal plate 20 have the same area, and they are both equal to the area of ​​the sample 18. This design helps the solution to enter the upper and lower surfaces of the sample through the water-permeable plates. Embodiment 4

[0032] In order to ensure the accuracy of the test results. Figure 3 and 4 As shown, a level bubble 23 is provided on the base plate 1, and leveling feet 22 are provided at the four corners of the bottom of the base plate 1 respectively. The four leveling feet 22 cooperate with each other according to the bubble position indication of the level bubble 23 to keep the base plate 1 in a horizontal state.

[0033] In the above embodiment, it should be noted that the first metal plate 19 and the second metal plate 20 are both thin copper sheets coated with epoxy resin. In addition, with regard to other related designs of this test, the specific configuration is preferably as follows: the test box 2 and the box cover 3 are made of colorless and transparent inorganic glass, the L-shaped plate 9 and the bracket 16 are made of stainless steel, the first displacement sensor 10 and the second displacement sensor 15 are TR.LA80SSI linear displacement sensors, the thermocouple 11 and the temperature controller 27 are JXSBS-3001-PH-temperature sensing controllers, the endoscope high-definition camera 14 is CC-Y03 endoscope high-definition camera, and the heating rod 13 is XBS-TFLB08220v Teflon electric heating tube.

[0034] Specific steps:

[0035] Step 1, place the test device, embed the test box 2 on the bottom plate 1, and adjust the leveling foot 22 to make the bubble of the level 23 centered;

[0036] Step 2, prepare a standard sample 18 according to the test requirements, and prepare a solution 13 with a predetermined pH value according to the test design;

[0037] Step 3, place the sample 18 into the test box 2, and place water-permeable plates 21 above and below the sample 18, and place a metal plate with epoxy resin coating on the top, and place them in the groove at the bottom of the test box 2;

[0038] Step 4, respectively install the first displacement sensor 10 and the second displacement sensor 15 so that their probes are in contact with the sample 18, and a thin copper sheet coated with epoxy resin is placed at the contact point to prevent the probes from partially crushing the sample 18;

[0039] Step 5, turn on the computer 25 connected to the data collector, and observe the data of the displacement sensor until the data at intervals of 10 minutes remain unchanged for three times;

[0040] Step 6, turn on the temperature controller 27 and the pH detector 26, and slowly inject the prepared solution into the test box 2 until the water-impermeable plate 21 on the sample 18 is submerged;

[0041] Step 7, buckle the left and right parts of the box cover 3 with the test box 2, align the second displacement sensor 15 with the two semicircular mounting holes 302 to avoid disturbance of the second displacement sensor 15, and turn on the endoscope high-definition camera 14;

[0042] Step 8, setting the pH value and temperature at this time to standard values, and the immersion time is not less than 48 hours;

[0043] Step 9, during the test, if the pH value changes, the pH can be adjusted by adding a solution into the test box 2;

[0044] Step 10, during the test, pay attention to the image recorded by the endoscopy high-definition camera 14, and focus on observing whether the sample 18 is disintegrated, falls off, or becomes muddy or softened during the immersion period;

[0045] Step 11, after the test is finished, save the data, turn off the temperature controller 27 and the pH detector 26, open the manual drain valve 8 at the bottom of the solution tank, collect the liquid in the waste liquid bucket, take out the sample 18, and observe;

[0046] Step 12, , The average radial deformation value of the sample is the average value of the data measured by the four horizontal displacement sensors 4.

[0047] The above shows and describes the main features and advantages of the utility model. For those skilled in the art, it is obvious that the specific implementation of the utility model is not limited to the details of the above exemplary embodiments, and the creative ideas and design ideas of the utility model can be realized in other specific forms without departing from the spirit or basic features of the utility model, which should be equivalent to the protection scope disclosed in the technical solution of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is limited by the attached claims rather than the above description, so it is intended to include all changes that fall within the meaning and scope of the equivalent elements of the claims in the utility model.

[0048] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A rock free expansion rate test device, comprising a base plate (1), a test box (2) arranged on the base plate (1), and a box cover (3) arranged on the test box (2), characterized in that: First displacement sensors (10) are distributed around the test box (2). The probe of each first displacement sensor (10) passes through the side wall of the test box (2) and is mounted on the bottom plate (1) via an L-shaped plate (9). A bracket (16) is mounted on one of the L-shaped plates (9) via an adjusting bolt (17). A second displacement sensor (15) is arranged on the bracket (16). The probe of the second displacement sensor (15) passes through the center of the box cover (3). A thermocouple (11), a pH detection probe (12) and a heating rod (13) are respectively embedded in the test box (2). The four first displacement sensors (10) and the second displacement sensors (15) are connected to a computer (25) through signal lines, respectively, the thermocouple (11) and the heating rod (13) are connected to a temperature controller (27) through electric wires to form a temperature control system, the pH detection probe (12) is connected to the pH detection instrument (26) through a data line, the sample (18) is placed in the test box (2), and the probes of the four first displacement sensors (10) are in contact with the four side surfaces of the sample (18) through the first metal plate (19), and the probe of the second displacement sensor (15) is in contact with the top surface of the sample (18) through the second metal plate (20), and the prepared solution is injected into the test box (2) to completely immerse the sample (18).

2. A rock free expansion rate test device according to claim 1, characterized in that: Water-permeable plates (21) are respectively arranged on the top and bottom of the sample (18), and the second metal plate (20) is located above the water-permeable plate (21) on the top of the sample (18).

3. A rock free expansion rate test device according to claim 2, characterized in that: The two water-permeable plates (21) have the same area as the second metal plate (20), and are both equal to the area of ​​the test specimen (18).

4. A rock free expansion rate test device according to any one of claims 1 to 3, characterized in that: Four endoscopic high-definition cameras (14) are arranged on the box cover (3). The four endoscopic high-definition cameras (14) are distributed on four sides of the box cover (3) and are respectively connected to a computer (25) via signal lines. The four endoscopic high-definition cameras (14) are used to record images of the sample (18) during immersion, such as disintegration, falling off, muddling or softening of the surface, and upload the images to the computer (25) for observation by test personnel.

5. A rock free expansion rate testing device according to claim 4, characterized in that: A level bubble (23) is provided on the base plate (1), and leveling feet (22) are provided at the four corners of the bottom of the base plate (1). The four leveling feet (22) cooperate with each other according to the bubble position indication of the level bubble (23), so that the base plate (1) is in a horizontal state.

6. A rock free expansion rate test device according to claim 5, characterized in that: The box cover (3) is divided into two cover bodies (301), and the two parts are assembled together via a hinged fastener (4). Semicircular mounting holes (302) are respectively provided at the centers of the connecting edges of the two cover bodies (301) for embedding the second displacement sensor (15).

7. A rock free expansion rate testing device according to claim 6, characterized in that: A handle (24) is provided on each of the cover bodies (301) to facilitate test personnel to quickly assemble and disassemble the box cover (3).

8. A rock free expansion rate test device according to any one of claims 1 to 3 or any one of claims 5 to 7, characterized in that: A liquid injection pipe (5) is provided on the box cover (3), and a silicone plug (6) is provided on the liquid injection pipe (5).

9. A rock free expansion rate testing device according to claim 8, characterized in that: A liquid discharge pipe (7) is provided at the bottom of the test box (2), and a liquid discharge manual valve (8) is installed on the pipe.

10. A rock free expansion rate test device according to any one of claims 1 to 3 or any one of claims 5 to 7 or 9, characterized in that: The first metal plate (19) and the second metal plate (20) are both thin copper sheets coated with epoxy resin.

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