Acoustic emission monitoring clamp box for disturbing true triaxial test and use method of acoustic emission monitoring clamp box

Abstract

The invention discloses an acoustic emission monitoring clamp box for disturbing a true triaxial test and a use method of the acoustic emission monitoring clamp box. The acoustic emission monitoring clamp box comprises a box body, a sensor mounting assembly, a sample fixing assembly, a sealing assembly and an anti-interference assembly, the box body is of a hollow cubic structure, openings are respectively formed in six surfaces of the box body, and the sensor mounting assembly and the sample fixing assembly are respectively mounted at the openings of the box body; the sealing assembly is used for enhancing the sealing performance of the box body, and the anti-interference assembly is used for reducing external interference; the side wall of the box body is provided with a cable hole with a rubber sealing ring. By arranging the sensor mounting assembly, stable mounting and position adjustment of the acoustic emission sensor can be realized, good contact between the acoustic emission sensor and the sample is ensured, and the accuracy of a monitoring signal is improved. The sample fixing assembly can adapt to samples of different sizes, has a good fixing effect, prevents the samples from sliding in the test process, and ensures smooth proceeding of the test.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of geotechnical engineering test equipment, and relates to an acoustic emission monitoring clamp box for disturbed true triaxial tests and a use method thereof. BACKGROUND

[0002] In geotechnical engineering research, true triaxial tests are an important means to study the mechanical properties of rock-soil bodies under three-dimensional stress states. Monitoring the acoustic emission signals generated inside the rock-soil bodies during the tests can help researchers better understand the damage evolution law and failure mechanism of the rock-soil bodies.

[0003] Currently, the existing acoustic emission monitoring devices for true triaxial tests have many problems when facing disturbance conditions. On the one hand, the installation of acoustic emission sensors is not stable enough, and displacement may occur during the test due to disturbance, resulting in inaccurate monitoring signals. On the other hand, the structural design of the clamp box is unreasonable, and it cannot well adapt to rock-soil samples of different sizes, and there is a great hindrance to the transmission of acoustic emission signals, affecting the monitoring effect. In addition, the existing clamp box performs poorly in sealing and anti-interference, and external environmental noise and vibration can easily interfere with acoustic emission monitoring, reducing the reliability of monitoring data.

[0004] Therefore, it is of great practical significance to develop a disturbed true triaxial test acoustic emission monitoring clamp box that can stably install acoustic emission sensors, adapt to different sizes of samples, and has good sealing and anti-interference performance. SUMMARY

[0005] The present application aims to provide a disturbed true triaxial test acoustic emission monitoring clamp box and a use method thereof, to realize accurate and stable monitoring of acoustic emission signals of rock-soil bodies in disturbed true triaxial tests.

[0006] According to the purpose of the present application, the present application provides a disturbed true triaxial test acoustic emission monitoring clamp box, which comprises a box body, a sensor installation assembly, a sample fixing assembly, a sealing assembly and an anti-interference assembly. The box body is a hollow cuboid structure, and six faces are respectively provided with openings. The sensor installation assembly and the sample fixing assembly are respectively installed at the openings of the box body. The sealing assembly is used to enhance the sealing property of the box body, and the anti-interference assembly is used to reduce external interference. The box body side wall is provided with a cable hole with a rubber sealing ring.

[0007] Further, the sensor mounting assembly comprises a sensor mounting seat, an adjusting rod and a fixing bolt; the sensor mounting seat is arranged at the opening of the box body, a groove matching the acoustic emission sensor is formed in the interior of the sensor mounting seat, an elastic pad made of silica gel and a temperature sensor connected with an external device are pasted in the groove; one end of the adjusting rod is welded to the sensor mounting seat, the other end penetrates the side wall of the box body and is threadedly connected with the fixing bolt, the distance between the sensor and the sample is adjusted by rotating the adjusting rod, and the fixing bolt is tightened to realize fixation.

[0008] Further, the sample fixing assembly comprises an upper pressing plate, a lower pressing plate, a left clamping plate and a right clamping plate, the upper pressing plate, the lower pressing plate, the left clamping plate and the right clamping plate are arranged at the upper, lower, left and right openings of the box body respectively and are slidably connected with the box body through slide rails; the upper pressing plate and the lower pressing plate are provided with threaded holes, the box body is connected through bolts and the distance is adjusted; the left clamping plate and the right clamping plate are provided with hydraulic cylinders, the cylinder body is fixed to the box body, the piston rod is connected with the clamping plate, and the distance is adjusted through the extension and retraction of the hydraulic cylinder.

[0009] Further, the sealing assembly comprises a sealing ring made of butyronitrile rubber and a sealing cover made of high-strength alloy; the sealing ring is arranged in the groove at the edge of the opening of the box body; the sealing cover is arranged at the front and rear openings of the box body and is connected with the box body through bolts.

[0010] Further, the anti-interference assembly comprises a shielding layer made of copper foil and a damping pad made of rubber; the shielding layer is pasted to the inner wall of the box body; and the damping pad is pasted to the bottom of the box body.

[0011] According to another object of the present application, the present application provides a use method of the acoustic emission monitoring clamp box for the disturbance true triaxial test, comprising the following steps: In use, the upper pressing plate, the lower pressing plate, the left clamping plate and the right clamping plate are first adjusted according to the size of the sample to fix the sample, then the acoustic emission sensor is arranged in the groove of the sensor mounting seat and the distance is adjusted, the sealing cover is covered, the cable is then penetrated out through the cable hole and connected with the external monitoring device.

[0012] The present application has the following beneficial effects: The sensor mounting assembly is arranged, stable installation and position adjustment of the acoustic emission sensor can be realized, good contact between the acoustic emission sensor and the sample is ensured, and the accuracy of the monitoring signal is improved. The sample fixing assembly can adapt to samples of different sizes and has good fixing effect, so that sliding of the sample during the test is prevented, and smooth test is ensured. The arrangement of the sealing assembly and the anti-interference assembly can effectively improve the sealing performance and anti-interference performance of the box body, reduce the influence of the external environment on the acoustic emission monitoring, and improve the reliability of the monitoring data. The box body is made of high-strength alloy material and has good compression resistance and deformation resistance, so that the high stress requirement of the true triaxial test can be met. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of an embodiment of the application; Figure 2 It is a structural schematic diagram of a sensor mounting assembly of an embodiment of the application; Figure 3 It is a structural schematic diagram of a sample fixing assembly of an embodiment of the application; Figure 4 It is a structural schematic diagram of a sealing assembly of an embodiment of the application; Figure 5 It is a structural schematic diagram of an anti-interference assembly of an embodiment of the application; In the figure: 1, box body; 2, sensor mounting assembly; 201, sensor mounting seat; 202, adjusting rod; 203, fixing bolt; 204, elastic pad; 3, sample fixing assembly; 301, upper pressing plate; 302, lower pressing plate; 303, left clamping plate; 304, right clamping plate; 305, bolt; 306, hydraulic cylinder; 4, sealing assembly; 401, sealing ring; 402, sealing cover; 403, sealing pad; 5, anti-interference assembly; 501, shielding layer; 502, damping pad; 6, cable hole; 7, rubber sealing ring; 8, temperature sensor. DETAILED DESCRIPTION

[0014] The specific embodiments of the application will be further described below. It should be noted that the description of these embodiments is used to help understand the application, but does not constitute a limitation on the application. In addition, the technical features involved in each embodiment of the application described below can be combined with each other as long as they do not conflict with each other.

[0015] Embodiment 1 As Figures 1-5As shown, a kind of acoustic emission monitoring fixture box of disturbance true triaxial test includes box body 1, sensor installation component 2, sample fixing component 3, sealing component 4 and anti-interference component 5, wherein: Box body 1 is hollow cuboid structure, and it is forged by high-strength alloy material, and six faces are respectively provided with opening, and the size of opening is designed according to the size of sensor installation component 2 and sample fixing component 3, and sensor installation component 2 and sample fixing component 3 are respectively installed at the opening of box body 1.

[0016] Cable hole 6 is formed in the side wall of box body 1, rubber sealing ring 7 is arranged in cable hole 6, the cable of acoustic emission sensor is worn out, and the sealing property is enhanced. The outer surface of box body 1 is coated with anticorrosive coating to improve its corrosion resistance. Sensor installation component 2 includes sensor mounting seat 201, adjusting rod 202 and fixing bolt 203, sensor mounting seat 201 is arranged at the opening of box body 1, and recess matched with acoustic emission sensor is formed in the inside, and elastic pad 204 is pasted in the recess, and elastic pad 204 is made of silica gel material, and the thickness is 2mm. Temperature sensor 8 is pasted in the recess of sensor mounting seat 201, and temperature sensor 8 is connected with external monitoring equipment through cable. Adjusting rod 202 is made of stainless steel material, one end thereof is connected with sensor mounting seat 201 by welding, the other end thereof passes through the side wall of box body 1 and is threadedly connected with fixing bolt 203. By rotating adjusting rod 202, the length of adjusting rod 202 extending out of box body 1 can be adjusted, so that the distance between acoustic emission sensor and sample can be adjusted, and after adjustment, fixing bolt 203 is tightened to fix adjusting rod 202 on box body 1.

[0017] Sample fixing component 3 includes upper pressing plate 301, lower pressing plate 302, left clamping plate 303 and right clamping plate 304, upper pressing plate 301, lower pressing plate 302, left clamping plate 303 and right clamping plate 304 are made of high-strength alloy material, and are respectively arranged at the upper and lower and left and right openings of box body 1 and are slidably connected with box body 1 by slide rail. Threaded holes are formed in upper pressing plate 301 and lower pressing plate 302, and are connected with box body 1 by bolt 305, and the distance between upper pressing plate 301 and lower pressing plate 302 can be adjusted by adjusting the tightness of bolt 305. Hydraulic cylinder 306 is mounted on left clamping plate 303 and right clamping plate 304, the cylinder body of hydraulic cylinder 306 is fixed on box body 1 by bolt, and the piston rod is connected with left clamping plate 303 or right clamping plate 304 by bolt, and the distance between left clamping plate 303 and right clamping plate 304 can be adjusted by controlling the extension and contraction of hydraulic cylinder 306. The inner side of upper pressing plate 301, lower pressing plate 302, left clamping plate 303 and right clamping plate 304 is processed with anti-skid line, and the outer side is welded with reinforcing rib. The sealing assembly 4 is used to enhance the sealing performance of the box body, and comprises a sealing ring 401 and a sealing cover 402, wherein the sealing ring 401 is made of butyronitrile rubber material and is arranged in a groove at the opening edge of the box body 1; the sealing cover 402 is made of high-strength alloy material and is arranged at the front and rear openings of the box body 1, and the sealing cover 402 is connected to the box body 1 through bolts, and a sealing gasket 403 made of fluorine rubber material is attached to the inner side of the sealing cover 402. The anti-interference assembly 5 is used to reduce external interference, and comprises a shielding layer 501 and a damping pad 502, wherein the shielding layer 501 is made of copper foil material and is attached to the inner wall of the box body 1 through glue, and the thickness of the copper foil is 0.1 mm; the damping pad 502 is made of rubber material and has a thickness of 10 mm and is attached to the bottom of the box body 1.

[0018] The sensor mounting assembly can stably mount and adjust the position of the acoustic emission sensor, ensure good contact between the acoustic emission sensor and the sample, and improve the accuracy of the monitoring signal. The sample fixing assembly can adapt to samples of different sizes and has good fixing effect, prevents the sample from sliding during the test, and ensures the smooth progress of the test. The sealing assembly and the anti-interference assembly can effectively improve the sealing performance and anti-interference performance of the box body, reduce the influence of the external environment on the acoustic emission monitoring, and improve the reliability of the monitoring data. The box body is made of high-strength alloy material and has good compression resistance and deformation resistance, and can meet the high stress requirement of the true triaxial test.

[0019] Although the embodiments of the present patent have been shown and described, it is understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present patent, and the scope of the present patent is defined by the appended claims and their equivalents.

Claims

1. An acoustic emission monitoring jig box for a disturbed true triaxial test, characterized by, The application relates to a box body, a sensor mounting assembly, a sample fixing assembly, a sealing assembly and an anti-interference assembly; the box body is a hollow cuboid structure, six surfaces of the box body are respectively provided with openings, the sensor mounting assembly and the sample fixing assembly are respectively arranged at the openings of the box body; the sealing assembly is used for enhancing the sealing performance of the box body, and the anti-interference assembly is used for reducing external interference; a cable hole with a rubber sealing ring is arranged in the side wall of the box body.

2. The acoustic emission monitoring cell for the disturbed true triaxial test according to claim 1, characterized in that, The sensor mounting assembly comprises a sensor mounting seat, an adjusting rod and a fixing bolt; the sensor mounting seat is arranged at the opening of the box body, a groove matched with an acoustic emission sensor is arranged in the sensor mounting seat, an elastic pad made of silica gel and a temperature sensor connected with an external device are attached in the groove, one end of the adjusting rod is welded to the sensor mounting seat, the other end of the adjusting rod penetrates the side wall of the box body and is threadedly connected with the fixing bolt, the distance between the sensor and the sample is adjusted by rotating the adjusting rod, and the fixing bolt is tightened to realize fixation.

3. The acoustic emission monitoring cell for the disturbed true triaxial test according to claim 1, wherein, The sample fixing assembly comprises an upper pressing plate, a lower pressing plate, a left clamping plate and a right clamping plate; the upper pressing plate, the lower pressing plate, the left clamping plate and the right clamping plate are respectively arranged at the upper, lower, left and right openings of the box body and are slidably connected with the box body through sliding rails; the upper pressing plate and the lower pressing plate are provided with threaded holes, the box body is connected through bolts and the distance is adjusted; the left clamping plate and the right clamping plate are provided with hydraulic cylinders, the cylinder body is fixed to the box body, the piston rod is connected with the clamping plate, and the distance is adjusted through the extension and retraction of the hydraulic cylinders.

4. The acoustic emission monitoring cell for the disturbed true triaxial test according to claim 1, wherein, The sealing assembly comprises a sealing ring made of butyronitrile rubber and a sealing cover made of high-strength alloy; the sealing ring is arranged in the groove at the edge of the opening of the box body; and the sealing cover is arranged at the front and rear openings of the box body and is connected with the box body through bolts.

5. The acoustic emission monitoring cell for the disturbed true triaxial test according to claim 1, wherein, The anti-interference assembly comprises a shielding layer made of copper foil and a damping pad made of rubber; the shielding layer is attached to the inner wall of the box body; and the damping pad is attached to the bottom of the box body.

6. The method of using the acoustic emission monitoring fixture box for the disturbed true triaxial test according to any one of claims 1-5, characterized in that, In use, the upper pressing plate, the lower pressing plate, the left clamping plate and the right clamping plate are adjusted according to the size of the sample to fix the sample, the acoustic emission sensor is arranged in the groove of the sensor mounting seat and the distance is adjusted, the cable is led out through the cable hole after the sealing cover is covered, and the external monitoring device is connected.

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