Indoor in-situ test teaching experiment visualization device and method based on deformation state and stress detection

Abstract

The invention provides an indoor in-situ test teaching experiment visualization device and method based on deformation state and stress detection, the device comprises a penetration platform for penetration in an experiment process, the inner bottom of the penetration platform is provided with a test box, and the test box is used for containing a transparent soil sample with layered pigments; the test box is used for screening a soil shape, simulating the stress condition of a corresponding soil body, and performing layered compaction for a test process; the stress detection equipment is arranged on the penetration platform, is used for detecting stress in the test process and is connected with the static strain gauge. When the multifunctional in-situ testing device is used, the sample box is filled with a plurality of layers of transparent soil in different soil shapes, and a layer of pigment is laid on each layer of transparent soil, so that students can clearly observe soil damage in the using process of the device.

Description

Technical Field

[0001] The invention relates to the technical field of slope prevention and control, and in particular to an indoor in-situ test teaching experiment visualization device and method based on deformation state and stress detection. Background Art

[0002] The in-situ testing method is one of the important means of geotechnical engineering investigation. Commonly used in-situ testing methods include: static penetration test, cross-plate shear test, flat shovel lateral expansion test, lateral pressure test, etc.

[0003] Existing in-situ test experimental devices all require a sufficiently large outdoor test site, which does not meet the needs of class. They need to be moved outdoors by manpower to start the experiment, and the total amount of in-situ test penetration equipment is large and inconvenient to move. In our experiment, the soil state of each layer has been screened and known, and can be matched one by one with the stress value after the experiment is completed. The transparent acrylic sample bucket and the transparent soil with layers of pigment used in the experiment can visualize the soil damage and play a better teaching role. With respect to the above-mentioned related technologies, the inventors believe that the current teaching devices for in-situ testing experiments have defects such as invisible soil damage conditions and invisible rock and soil stress curves. Summary of the invention

[0004] The present invention provides an indoor in-situ test teaching experiment visualization device and method based on deformation state and stress detection. When the multifunctional in-situ test device is in use, several layers of transparent soil with different soil states are filled in the sample box, and a layer of paint is spread on each layer of transparent soil, so that students can clearly observe the soil damage during the use of the device.

[0005] In order to realize the above technical features, the object of the present invention is achieved as follows: an indoor in-situ test teaching experiment visualization device based on deformation state and stress detection, characterized in that it includes a penetration platform for penetration during the experiment, and the inner bottom of the penetration platform is provided with a test box, and the test box is used to hold a transparent soil sample with a layered pigment; The test box is used to screen soil conditions, simulate the stress conditions of the corresponding soil, and compact it in layers for the testing process; It also includes a stress detection device which is arranged on the penetration platform and is used to detect stress during the test. The stress detection device is connected to the static strain gauge.

[0006] The penetration platform comprises a support frame, and a penetration device is slidably supported on the top of the support frame through a longitudinal adjustment mechanism and a transverse adjustment mechanism.

[0007] The longitudinal adjustment mechanism comprises longitudinal slide rails fixed on both sides of the top of the support frame, a longitudinal support beam is slidably mounted on the top of the longitudinal slide rail, longitudinal positioning holes arranged at equal intervals are arranged on the outer side wall of the longitudinal slide rail, and the longitudinal support beam is locked and limited by the positioning pin and the longitudinal positioning hole after the position adjustment is completed; The transverse adjustment mechanism includes a transverse sliding plate slidably installed on the top of the longitudinal support beam, a penetration device is fixedly installed on the top of the transverse sliding plate, and transverse positioning holes arranged at equal intervals are provided on the top of the longitudinal support beam. After the position adjustment is completed, the transverse sliding plate is locked and limited by the positioning pins and the transverse positioning holes.

[0008] The support frame adopts a steel frame, and universal casters are fixed at the four corners of the bottom of the support frame; The penetration device comprises a multi-stage hydraulic penetration device.

[0009] The test box adopts a transparent test barrel, and the transparent test barrel adopts an acrylic transparent side wall, and the acrylic transparent side wall is a visible structure. The top and bottom of the transparent test barrel are provided with steel rings for reinforcement; The transparent soil sample is dyed with pigments in layers, and after being compacted in layers, it is placed inside a transparent test barrel.

[0010] The stress detection equipment includes multiple groups of longitudinal strain gauges and circumferential strain gauges; the longitudinal strain gauges are arranged vertically and longitudinally inside the transparent soil sample of the transparent test barrel; The annular strain gauge is horizontally annularly arranged inside the transparent soil sample of the transparent test barrel.

[0011] The static strain gauge comprises an input wiring port, a power wiring port, an output wiring port, a liquid crystal display and a strain gauge terminal; the input wiring port and the output wiring port are connected to a computer to receive a strain data curve.

[0012] The strain gauge terminal is connected to the longitudinal strain gauge and the circumferential strain gauge inside the transparent test barrel through a wire and is used to receive data and display it on a liquid crystal display. It is then connected to a computer through an input wiring port and an output wiring port to receive a strain data curve.

[0013] A method for conducting an experiment based on an indoor in-situ test teaching experiment visualization device for deformation state and stress detection, comprising the following steps: Step 1, material preparation: Prepare the visualization equipment needed during the experiment; Step 2, fill in transparent soil sample: When the visualization device is in use, several layers of transparent soil samples of different soil shapes are filled in the test box, and a layer of layered pigment is spread on each layer of transparent soil sample, so that the device can observe the soil damage during use; in the specific experiment process, the soil shape can be selected or the layer thickness can be changed according to the experimental requirements; Step 3, arrange the strain gauges: During the layered laying of transparent soil samples, a corresponding number of longitudinal strain gauges and annular strain gauges are arranged at corresponding positions according to experimental requirements; Step 4, test teaching experiment: Experimental principle: Based on the data read by the static strain gauge, the relationship or curve of the radial strain and vertical strain of the surrounding soil with depth and radius under certain conditions of cone tip resistance and side wall friction resistance is obtained; When using the in-situ test teaching experiment visualization device, first check whether all parts of the equipment are normal, whether they meet the working conditions, and whether the connection is firm. After all checks are completed and confirmed to be correct, install the equipment; then place the test box containing the transparent soil sample on the penetration platform through a flatbed cart, and move the penetration device through the longitudinal adjustment mechanism and the lateral adjustment mechanism to make the probe more than 70mm away from the boundary to reduce the size effect; pull it out after penetration, and then move it to a second borehole 130mm apart to reduce the disturbance effect of the first penetration, so as to realize the entire test process; during use, observe the changes of transparent soil samples and stratified pigments through the transparent test barrel, so that the observer can intuitively feel the soil destruction process and better teach; the strain gauge terminal is connected to the longitudinal strain gauge and the annular strain gauge in the transparent test barrel through a wire to receive data, which is displayed on the LCD, and then connected to the computer through the input wiring port and the output wiring port to receive the strain data curve.

[0014] In the specific arrangement process of the longitudinal strain gauge and the circumferential strain gauge in Step 3, the longitudinal strain gauge and the circumferential strain gauge are arranged in the middle of the transparent test barrel and at positions 300 mm apart above and below; the circumferential strain gauge is arranged at the barrel wall and at 1 / 2 of the radius along the barrel circumference direction; the longitudinal strain gauge is arranged at the barrel wall and at 1 / 2 of the radius along the barrel axis direction; the circumferential strain gauge and the longitudinal strain gauge are arranged at an interval of 90°; 8 gauges are arranged for each layer of soil samples, 4 circumferential strain gauges and 4 longitudinal strain gauges; During use, the following precautions should be taken: Before installing the annular strain gauge and the longitudinal strain gauge, ensure that the surface of the specimen is clean and flat, and connect wires at both ends of the strain gauge to transmit the signal to the strain gauge; the arrangement of the strain gauge should avoid stress concentration areas to reduce errors; be careful during installation to avoid damaging the strain gauge or affecting its performance; before testing, calibration and verification should be performed to ensure the accuracy of the measurement results.

[0015] Beneficial effects of the present invention: 1. This test process is convenient. It only requires the sample soil to be prepared in advance and connected to the sounding rod. There is no need to transport any instruments and equipment to the field. Students can carry out in-situ rock and soil testing in the laboratory.

[0016] 2. During the experiment, students can avoid various unknown situations encountered in outdoor experiments, reduce damage to the probe, and reduce financial expenditure.

[0017] 3. When the multifunctional in-situ testing device is in use, several layers of transparent soil of different soil types are filled in the sample box, and a layer of paint is spread on each layer of transparent soil, so that students can clearly observe the soil damage during the use of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0019] Figure 1 This is the overall picture of the experimental device from the first perspective.

[0020] Figure 2 Schematic diagram of the soil sample box structure.

[0021] Figure 3 Schematic diagram of vertical strain gauge.

[0022] Figure 4 Schematic diagram of the hoop strain gauge.

[0023] Figure 5 Schematic diagram of the static strain gauge device.

[0024] Figure 6 This is the overall picture of the experimental device from the second perspective.

[0025] Figure 7 This is the overall picture of the experimental device from the third perspective.

[0026] Figure 8 This is the overall picture of the experimental device from the fourth perspective.

[0027] Fig. 9 This is the overall diagram of the experimental device from the fifth perspective.

[0028] In the figure: penetration device 1, support frame 2, transparent test barrel 3, static strain gauge 4, steel ring 5, acrylic transparent side wall 6, transparent soil sample 7, layered pigment 8, longitudinal strain gauge 9, annular strain gauge 10, input wiring port 11, power wiring port 12, output wiring port 13, liquid crystal display 14, strain gauge terminal 15. DETAILED DESCRIPTION

[0029] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0030] Embodiment 1: like Figure 1-9 As shown, an indoor in-situ test teaching experiment visualization device based on deformation state and stress detection is characterized in that it includes a penetration platform for penetration during the experiment, and a test box is provided at the inner bottom of the penetration platform, and the test box is used to hold a transparent soil sample 7 with layered pigment 8; the test box is used to screen the soil state, simulate the stress condition of the corresponding soil body, and compact in layers for the test process; it also includes a stress detection device arranged on the penetration platform and used to detect the stress during the test, and the stress detection device is connected to the static strain gauge 4. When the multifunctional in-situ test device is in use, several layers of transparent soil with different soil states are filled in the sample box, and a layer of pigment is spread on each layer of transparent soil, so that students can clearly observe the damage of the soil body during the use of the device.

[0031] Furthermore, the penetration platform comprises a support frame 2, and the top of the support frame 2 is slidably supported by the penetration device 1 through a longitudinal adjustment mechanism and a transverse adjustment mechanism. The support frame 2 can be used to carry and support the entire device.

[0032] Furthermore, the longitudinal adjustment mechanism includes longitudinal slide rails fixed on both sides of the top of the support frame 2, a longitudinal support beam is slidably installed on the top of the longitudinal slide rail, and longitudinal positioning holes arranged at equal intervals are provided on the outer side wall of the longitudinal slide rail. After the position adjustment is completed, the longitudinal support beam is locked and limited by the positioning pin and the longitudinal positioning hole. The longitudinal arrangement position of the penetration device 1 can be adjusted by the above-mentioned longitudinal adjustment mechanism, thereby ensuring the position adjustment in the subsequent experimental process.

[0033] Furthermore, the transverse adjustment mechanism includes a transverse sliding plate slidably mounted on the top of the longitudinal support beam, the top of the transverse sliding plate is fixedly mounted with the penetration device 1, and the top of the longitudinal support beam is provided with transverse positioning holes arranged at equal intervals, and the transverse sliding plate is locked and limited by the positioning pins and the transverse positioning holes after the position adjustment is completed. The transverse adjustment mechanism can be used to adjust the transverse arrangement position of the penetration device 1, thereby ensuring the position adjustment in the subsequent experimental process.

[0034] Furthermore, the support frame 2 is made of a steel frame, and universal casters are fixed at the four corners of the bottom of the support frame 2; the penetration device 1 includes a multi-stage hydraulic penetration device. The universal casters facilitate the movement and adjustment of the position of the support frame 2 during subsequent experiments, thereby enhancing the flexibility of use.

[0035] Furthermore, the test box adopts a transparent test barrel 3, and the transparent test barrel 3 adopts an acrylic transparent side wall 6. The acrylic transparent side wall 6 is a visual structure, and the top and bottom of the transparent test barrel 3 are provided with a steel ring 5 for reinforcement; through the above-mentioned transparent test barrel 3, it is convenient to observe the experimental process of the destruction of the entire transparent soil sample 7 in the subsequent experimental process.

[0036] Furthermore, the transparent soil sample 7 is dyed with the layered pigment 8, and after being layered and compacted, it is placed inside the transparent test barrel 3. Furthermore, the stress detection device includes multiple groups of longitudinal strain gauges 9 and circumferential strain gauges 10; the longitudinal strain gauges 9 are arranged vertically and longitudinally inside the transparent soil sample 7 of the transparent test barrel 3; the circumferential strain gauges 10 are arranged horizontally and circumferentially inside the transparent soil sample 7 of the transparent test barrel 3; the static strain gauge 4 includes an input wiring port 11, a power wiring port 12, an output wiring port 13, a liquid crystal display 14 and a strain gauge terminal 15; the input wiring port 11 and the output wiring port 13 are connected to a computer to receive a strain data curve. The above-mentioned stress detection device can be used for stress detection during the experiment.

[0037] Furthermore, the strain gauge terminal 15 is connected to the longitudinal strain gauge 9 and the circumferential strain gauge 10 inside the transparent test barrel 3 through a wire, and is used to receive data, and display it on the liquid crystal display 14, and then connected to the computer through the input wiring port 11 and the output wiring port 13 to receive the strain data curve. Through the above wiring connection method, the data reception and processing during the experiment is guaranteed.

[0038] Embodiment 2: A method for conducting an experiment based on an indoor in-situ test teaching experiment visualization device for deformation state and stress detection, comprising the following steps: Step 1, material preparation: Prepare the visualization equipment needed during the experiment; Step 2, fill in transparent soil sample 7: When the visualization device is in use, several layers of transparent soil samples 7 of different soil shapes are filled in the test box, and a layer of layered pigment 8 is spread on each layer of transparent soil sample 7, so that the device can observe the soil damage during use; wherein, in the specific experiment process, the soil shape can be selected or the layer thickness can be changed according to the experimental requirements; Step 3, arrange the strain gauges: During the layered laying of the transparent soil sample 7, a corresponding number of longitudinal strain gauges 9 and annular strain gauges 10 are arranged at corresponding positions according to experimental requirements; Step 4, test teaching experiment: Experimental principle: Based on the data read by the static strain gauge 4, the relationship or curve of the radial strain and vertical strain of the surrounding soil with depth and radius under the conditions of certain cone tip resistance and side wall friction resistance is obtained; When using the in-situ test teaching experiment visualization device, first check whether all parts of the equipment are normal, whether they meet the working conditions, and whether the connection is firm. After all checks are completed and confirmed to be correct, install the equipment; then place the test box containing the transparent soil sample 7 on the penetration platform through a flatbed cart, move the penetration device 1 through the longitudinal adjustment mechanism and the lateral adjustment mechanism, so that the probe is more than 70 mm away from the boundary to reduce the size effect; pull it out after penetration, and then move it to a second borehole 130 mm apart to reduce the disturbance effect of the first penetration, so as to realize the entire test process; during use, observe the changes of the transparent soil sample 7 and the stratified pigment 8 through the transparent test barrel 3, so that the observer can intuitively feel the soil destruction process and better teach; the strain gauge terminal 15 is connected to the longitudinal strain gauge 9 and the annular strain gauge 10 in the transparent test barrel 3 through a wire to receive data, which is displayed on the liquid crystal display 14, and then connected to the computer through the input wiring port 11 and the output wiring port 13 to receive the strain data curve.

[0039] In the specific arrangement process of the longitudinal strain gauge 9 and the circumferential strain gauge 10 in Step 3, the longitudinal strain gauge 9 and the circumferential strain gauge 10 are arranged in the middle of the transparent test barrel 3 and at a position 300 mm apart above and below; wherein the circumferential strain gauge 10 is arranged at the barrel wall and at the radius 1 / 2 along the barrel circumference direction; the longitudinal strain gauge 9 is arranged at the barrel wall and at the radius 1 / 2 along the barrel axis direction; the circumferential strain gauge 10 and the longitudinal strain gauge 9 are arranged at an interval of 90°; 8 pieces are arranged for each layer of soil samples, and 4 pieces of circumferential strain gauges 10 and longitudinal strain gauges 9 are arranged; During use, the following precautions should be taken: Before installing the annular strain gauge 10 and the longitudinal strain gauge 9, ensure that the surface of the specimen is clean and flat, and connect wires at both ends of the strain gauge to transmit the signal to the strain gauge; the arrangement of the strain gauges should avoid stress concentration areas to reduce errors; be careful during installation to avoid damaging the strain gauges or affecting their performance; before testing, calibration and verification should be performed to ensure the accuracy of the measurement results.

Claims

1. An indoor in-situ test teaching experiment visualization device based on deformation state and stress detection, characterized in that: It comprises a penetration platform for penetration during the experiment, wherein the inner bottom of the penetration platform is provided with a test box, and the test box is used to hold a transparent soil sample (7) with a layered pigment (8); The test box is used to screen soil conditions, simulate the stress conditions of the corresponding soil, and compact it in layers for the testing process; It also includes a stress detection device which is arranged on the penetration platform and is used to detect stress during the test. The stress detection device is connected to the static strain gauge (4).

2. According to claim 1, a visualization device for indoor in-situ testing teaching experiment based on deformation state and stress detection, characterized in that: The penetration platform comprises a support frame (2), and the top of the support frame (2) is slidably supported by a penetration device (1) via a longitudinal adjustment mechanism and a transverse adjustment mechanism.

3. According to claim 2, a visualization device for indoor in-situ testing teaching experiment based on deformation state and stress detection is characterized in that: The longitudinal adjustment mechanism comprises longitudinal slide rails fixed on both sides of the top of the support frame (2), a longitudinal support beam is slidably mounted on the top of the longitudinal slide rail, longitudinal positioning holes arranged at equal intervals are provided on the outer side wall of the longitudinal slide rail, and the longitudinal support beam is locked and limited by the positioning pin and the longitudinal positioning hole after the position adjustment is completed; The transverse adjustment mechanism comprises a transverse sliding plate slidably mounted on the top of the longitudinal support beam, a penetration device (1) is fixedly mounted on the top of the transverse sliding plate, and transverse positioning holes arranged at equal intervals are provided on the top of the longitudinal support beam. After the position adjustment is completed, the transverse sliding plate is locked and limited by positioning pins and the transverse positioning holes.

4. According to claim 2, a visualization device for indoor in-situ testing teaching experiment based on deformation state and stress detection is characterized in that: The support frame (2) adopts a steel frame, and universal casters are fixed at the four corners of the bottom of the support frame (2); The penetration device (1) comprises a multi-stage hydraulic penetration device.

5. According to claim 1, a visualization device for indoor in-situ testing teaching experiment based on deformation state and stress detection, characterized in that: The test box adopts a transparent test barrel (3), the transparent test barrel (3) adopts an acrylic transparent side wall (6), the acrylic transparent side wall (6) is a visible structure, and the top and bottom of the transparent test barrel (3) are provided with steel rings (5) for reinforcement; The transparent soil sample (7) is dyed with a layered pigment (8), compacted in layers, and then placed inside a transparent test barrel (3).

6. According to claim 5, a visualization device for indoor in-situ testing teaching experiment based on deformation state and stress detection is characterized in that: The stress detection device comprises a plurality of groups of longitudinal strain gauges (9) and circumferential strain gauges (10); the longitudinal strain gauges (9) are arranged vertically and longitudinally inside a transparent soil sample (7) of a transparent test barrel (3); The annular strain gauge (10) is horizontally annularly arranged inside the transparent soil sample (7) of the transparent test barrel (3).

7. According to claim 6, a visualization device for indoor in-situ testing teaching experiment based on deformation state and stress detection is characterized in that: The static strain gauge (4) comprises an input wiring port (11), a power wiring port (12), an output wiring port (13), a liquid crystal display (14), and a strain gauge terminal (15); the input wiring port (11) and the output wiring port (13) are connected to a computer to receive a strain data curve.

8. According to claim 7, a visualization device for indoor in-situ testing teaching experiment based on deformation state and stress detection is characterized in that: The strain gauge terminal (15) is connected to the longitudinal strain gauge (9) and the circumferential strain gauge (10) inside the transparent test barrel (3) via a wire and is used to receive data and display it on a liquid crystal display (14). It is then connected to a computer via an input wiring port (11) and an output wiring port (13) to receive a strain data curve.

9. A method for conducting an experiment using the indoor in-situ test teaching experiment visualization device based on deformation state and stress detection as described in any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1, material preparation: Prepare the visualization equipment needed during the experiment; Step 2, fill in the transparent soil sample (7): When the visualization device is used, several layers of transparent soil samples (7) of different soil properties are filled in the test box, and a layer of layered pigment (8) is spread on each layer of transparent soil sample (7), so that the device can observe soil damage during use; wherein, during the specific experiment, the soil property can be selected or the layer thickness can be changed according to the experimental requirements; Step 3, arrange the strain gauges: During the layered laying of the transparent soil sample (7), a corresponding number of longitudinal strain gauges (9) and annular strain gauges (10) are arranged at corresponding positions according to experimental requirements; Step 4, test teaching experiment: Experimental principle: Based on the data read by the static strain meter (4), the relationship or curve of the radial strain and vertical strain of the surrounding soil with depth and radius under certain conditions of cone tip resistance and side wall friction resistance is obtained; When using the in-situ test teaching experiment visualization device, first check whether all parts of the device are normal, whether they meet the working conditions, and whether the connection is firm. After all checks are completed and ensured to be correct, install the device; then place the test box containing the transparent soil sample (7) on the penetration platform through a flatbed cart, move the penetration device (1) through the longitudinal adjustment mechanism and the lateral adjustment mechanism, so that the probe is more than 70 mm away from the boundary to reduce the size effect; after penetration, pull it out, and then move it to a second drill hole 130 mm apart to reduce the disturbance effect of the first penetration, so as to achieve the entire test process; during use, observe the changes of the transparent soil sample (7) and the layered pigment (8) through the transparent test barrel (3), so that the observer can intuitively feel the soil destruction process and better conduct teaching; the strain gauge terminal (15) is connected to the longitudinal strain gauge (9) and the annular strain gauge (10) in the transparent test barrel (3) through a wire to receive data, display it on the liquid crystal display (14), and then connect it to the computer through the input wiring port (11) and the output wiring port (13) to receive the strain data curve.

10. The method for conducting experiments using the indoor in-situ test teaching experiment visualization device based on deformation state and stress detection according to claim 9, characterized in that: In the specific arrangement process of the longitudinal strain gauge (9) and the circumferential strain gauge (10) in Step 3, the longitudinal strain gauge (9) and the circumferential strain gauge (10) are arranged in the middle of the transparent test barrel (3) and at positions 300 mm apart above and below; wherein the circumferential strain gauge (10) is arranged at the barrel wall and at 1 / 2 of the radius along the barrel circumference direction; the longitudinal strain gauge (9) is arranged at the barrel wall and at 1 / 2 of the radius along the barrel axis direction; the circumferential strain gauge (10) and the longitudinal strain gauge (9) are arranged at an interval of 90°; 8 gauges are arranged for each layer of soil sample, and 4 gauges are arranged for the circumferential strain gauge (10) and the longitudinal strain gauge (9); During use, the following precautions should be taken: Before installing the annular strain gauge (10) and the longitudinal strain gauge (9), ensure that the surface of the specimen is clean and flat, and connect wires at both ends of the strain gauge to transmit the signal to the strain gauge; avoid arranging the strain gauge in stress concentration areas to reduce errors; be careful during installation to avoid damaging the strain gauge or affecting its performance; Before testing, calibration and verification should be performed to ensure the accuracy of the measurement results.

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