CN212321305U - Mining normal position triaxial experimental apparatus - Google Patents
Mining normal position triaxial experimental apparatus Download PDFInfo
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- CN212321305U CN212321305U CN201922022914.9U CN201922022914U CN212321305U CN 212321305 U CN212321305 U CN 212321305U CN 201922022914 U CN201922022914 U CN 201922022914U CN 212321305 U CN212321305 U CN 212321305U
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Abstract
The utility model discloses a mining normal position triaxial experimental apparatus. The device comprises a cubic coal sample, a rigid supporting iron plate, a portable rigid iron box, a pressure sensor, a wire, a stress acquisition instrument, a hydraulic pump, a pressure sensing device, a hydraulic pipe, a tee joint and a hydraulic loading head. And hydraulic oil is injected into the hydraulic loading head and the pressure sensing device buried in the coal bed by using the hydraulic pump, so that the stress acquisition instrument reaches a preset pressure value. The pressure change of the internal pressure of the coal bed is transmitted to the hydraulic loading head through the pressure sensing device, so that the pressure applied to the coal body sample is the actual pressure in the coal bed, the pressure changes of the x-axis, the y-axis and the z-axis directions of the coal body sample are monitored simultaneously, and the measured result is transmitted to the stress acquisition instrument through a lead. Therefore, the real stress state of the coal body near the mining surface during coal mining can be obtained, and the method provides help for the safe mining work of the coal mine. The utility model discloses structure and principle are simple, can effectual reaction working face stew or the coal body stress state of exploitation in-process.
Description
Technical Field
The utility model relates to a mining normal position triaxial experimental apparatus, especially a mining normal position triaxial experimental apparatus.
Background
China has abundant and widely distributed coal resources, but the occurrence conditions of coal seams are greatly different, the ground stress in coal mines is increased along with the increase of the depth, and the ground stress in all directions is different. Therefore, the understanding of the ground stress near the coal mining face is of great significance to the evaluation of the coal mining stability and the safe mining. In the coal mining process, due to the redistribution of the stress of the surrounding rock and the coal body, the stress-strain state of the surrounding rock of the goaf and the coal body in front of the surrounding rock changes along with the stress-strain state, and the safety of roadway support is certainly influenced, so that the understanding of the ground stress state near the coal mining face has very important significance for the evaluation of the coal mine stability and the safe mining.
SUMMERY OF THE UTILITY MODEL
The technical problem is as follows: the utility model aims to solve the problems in coal mining, and provides a mine in-situ triaxial experimental device with simple principle, easy operation and low cost.
The technical scheme is as follows: a mining in-situ triaxial experimental device comprises a pressure sensor, a rigid support iron plate, a lead, a stress acquisition instrument, a coal sample, a hydraulic loading head, a hydraulic pipe, a hydraulic pump, a pressure sensing device, a tee joint and a portable rigid iron box; the hydraulic loading head is connected with the pressure sensing device through a hydraulic pipe, the hydraulic loading head is placed in the portable rigid iron box, and the pressure sensing device is placed in the dug hole.
The size of the coal sample is 150mm multiplied by 150mm, the integral complete surface of the coal sample is basically smooth, and no obvious crack exists.
The hydraulic loading head is characterized by being provided with a large cylinder and a small cylinder, and a liquid inlet is formed in the outer side of the large cylinder for injecting hydraulic oil; the pressure of the two side force bearing ends is controlled by injecting hydraulic oil into the hydraulic loading head.
One side of the hydraulic loading head is close to the shell consisting of the rigid iron plate, and the other side of the hydraulic loading head is close to the rigid support iron plate.
The pressure sensor and the hydraulic loading head are symmetrical relative to the position of the coal sample and are connected with the stress acquisition instrument through a lead, and the size of the pressure sensor is 110mm multiplied by 40 mm.
The stress acquisition instrument is provided with 3 channels, can simultaneously acquire data of 3 pressure sensors, can store the data in real time through a USB data memory, and can also be connected with the existing substation of the coal mine safety monitoring system through a standard signal output interface to transmit the data to the ground in real time.
The portable rigid iron box is 300mm multiplied by 300mm, and the side surface of the iron box is provided with a hole with the diameter of 20mm for connecting a liquid supply pipe and a lead.
The number of the rigid supporting iron plates is 6, the rigid supporting iron plates are respectively in close contact with 6 surfaces of the coal body sample, and the size of the contact surface is the same as that of the coal body sample and is 150mm multiplied by 150 mm; the rigid supporting iron plate is positioned between the hydraulic loading head and the pressure sensor, so that the surface of the coal sample is uniformly stressed.
The hydraulic pump fills hydraulic oil into the hydraulic pipe, the pressure sensing device and the hydraulic loading head through the tee joint and the hydraulic pipe; the pressure sensing device bears the pressure of the coal bed and transmits the pressure to the hydraulic loading head through hydraulic oil; the hydraulic loading head and the pressure sensing device are balanced in pressure of the coal bed, and the pressure is transmitted to the pressure sensor through a coal sample taken out in situ; the pressure sensor transmits the pressure of the coal sample to the stress collector through a lead.
The three-way joint has 3 interfaces connected with hydraulic loading head, hydraulic pump and pressure sensor via hydraulic pipes.
The utility model provides a mining normal position triaxial experimental apparatus, its advantage lies in:
(1) has moderate volume and convenient carrying
(2) The stress acquisition instrument adopts three channels, so that the number of the acquisition instruments is reduced, and the manufacturing cost of the device is reduced;
(3) the stress acquisition instrument can store acquired data in real time through the USB interface and is connected with the coal mine safety monitoring system through the signal output interface, so that stress data can be obtained at any time, and when the equipment breaks down to block data transmission, the USB stored data can be called, so that data faults are avoided.
(4) The mining stress, mining disturbance and tunneling disturbance of a measuring point in the mining process can be measured.
(5) The device has the advantages of low manufacturing cost, simple structure, simple and convenient operation and high reliability.
Drawings
Fig. 1 is a general structural schematic diagram (top view) of the in-situ triaxial loading testing apparatus for mining of the present invention.
FIG. 2 is a cross-sectional view of the main body test apparatus.
In the figure, 1, a pressure sensor; 2. a rigid support iron plate; 3. a hydraulic loading head; 4. a wire; 5. a stress acquisition instrument; 6. a hydraulic tube; 7. A pressure sensing device; 8. a pressure sensing device; 9. a pressure sensing device; 10. a tee joint; 11. a hydraulic pump; 12. a portable rigid iron box; 13. A coal sample.
Detailed Description
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings
The utility model discloses a mining normal position triaxial experimental apparatus mainly includes pressure acquisition system, pressure loading system. The pressure acquisition system comprises a pressure sensor 1, a lead 4 and a stress acquisition instrument 5, and the pressure loading system comprises a hydraulic loading head 3, a hydraulic pipe 6, pressure sensing devices 7, 8 and 9 and a hydraulic pump 11. The pressure sensor 1 is connected with the stress acquisition instrument 5 through a lead 4, and the hydraulic loading head 3 is connected with the pressure sensing devices 7, 8 and 9 through a hydraulic pipe 6. The pressure sensing devices 7, 8 and 9 are two large and small cylinders, the large diameter is 100mm, the height is 50mm, the small diameter is 60mm, the height is 20mm, the maximum pressure capable of being borne is 100MPa, and hydraulic oil is filled in the pressure sensing devices to serve as sensing media. The coal samples were 150mm by 150mm in size, essentially intact, with no obvious gaps and defects. A rigid supporting iron plate 2 is arranged between the hydraulic loading head 3 and the coal sample 13, and the size of the contact surface of the rigid supporting iron plate 2 and the coal sample 13 is 150mm multiplied by 150 mm; the hydraulic loading head 3 is two big and small cylinders, the big diameter is 100mm, the height is 50mm, the small diameter is 60mm, the height is 20mm, and a liquid inlet is arranged on the side surface and can be connected with the hydraulic pipe 6. The pressure sensor 1 and the hydraulic loading head 3 are in a symmetrical relation relative to a coal sample 13 and are connected with the stress acquisition instrument 5 through a lead 4, a rigid support iron plate 2 is arranged between the pressure sensor 1 and the coal sample 13, and the pressure sensor 1 and the coal sample 13 are respectively in close contact with the rigid support iron plate.
The utility model discloses mining normal position triaxial experimental apparatus, at first, excavate a cube recess that size is suitable apart from coal seam mining face about 90m and be used for placing portable triaxial survey device, then process the coal cinder that digs out from the recess into cube coal sample 13; meanwhile, drilling holes at the position which is not more than one meter away from the groove, wherein the number of the holes is 3, the depth of the holes is 10 meters to 20 meters, one end of a hydraulic pipe 6 is connected to liquid inlets of pressure sensing devices 7, 8 and 9, and the other end of the hydraulic pipe is connected to a tee joint 10; the other two ports of the tee joint 10 are sealed one by one and connected with a hydraulic pump 11, hydraulic oil is injected into the pressure sensing devices 7, 8 and 9 by the hydraulic pump 11, and the sealing performance of the hydraulic pipe 6 and the pressure sensing devices 7, 8 and 9 is tested; the other two holes operate as above; if the sealing performance is good, the following steps are carried out, and if the sealing performance is not good and hydraulic oil obviously leaks out, the steps are repeated after treatment until the sealing performance is good; respectively feeding 3 pressure sensing devices 7, 8 and 9 into 3 holes, cementing the pressure sensing devices and a grouting hole packer, then installing the grouting hole packer with the pressure sensing devices in PVC pipes with the diameter slightly smaller than that of the drilled holes so as to push the pressure sensing devices into the holes, respectively adjusting the positions of the pressure sensing devices 7, 8 and 9, respectively enabling the pressure sensing devices 7, 8 and 9 to be distributed along the stress directions of x, y and z, sequentially connecting each PVC pipe by using quick connectors until the PVC pipes reach the bottom of the drilled holes, and after the grouting hole packer with the pressure sensors reaches the bottom, beginning to inject cement slurry into the holes through the PVC grouting pipes by using coal mine grouting equipment, wherein the grouting degree ensures that no gap exists between the pressure sensing devices and coal bodies and the grouting is tight; placing a coal sample 13, a rigid support iron plate 2, a pressure sensor 1 and a hydraulic loading head 3 in a portable rigid iron box 12 according to the figure, and ensuring good contact among all planes; the hydraulic pipe 6 and the lead 4 are extended out through a small hole on the surface of the iron box 12; connecting a lead 4 with an interface of a stress acquisition instrument 5, and respectively connecting 3 hydraulic pipes connected with 3 hydraulic loading heads with 3 tee joints; hydraulic oil is injected into the pressure induction devices 7, 8 and 9 and the hydraulic loading head 3 by a hydraulic pump 11 through a hydraulic pipe 6, the reading of the stress acquisition instrument 5 is read, and when the reading reaches the known stress level in the depth of the coal body in advance, the injection of the hydraulic oil is stopped; and recording the stress change condition of the coal body sample 13 during coal mining by the stress acquisition instrument 5.
Claims (8)
1. The utility model provides a mining normal position triaxial experimental apparatus which characterized in that: this loading device includes pressure sensor (1), rigid support iron plate (2), hydraulic pressure loading head (3), wire (4), instrument (5) is gathered to stress, hydraulic pressure pipe (6), pressure sensing device (7, 8, 9), tee bend (10), hydraulic pump (11), coal body sample (13), portable rigidity iron box (12), pressure sensor (1) is connected through wire and stress collection instrument (5), hydraulic pressure loading head (3) is balanced through coal body sample (13) and pressure sensor (1), pressure sensing device (7, 8, 9) are connected through hydraulic pressure pipe (6) and hydraulic pressure loading head (3).
2. The mining in-situ triaxial experimental apparatus according to claim 1, wherein: the pressure loading system comprises pressure sensing devices (7, 8 and 9), a hydraulic pipe (6), a hydraulic pump (11) and a hydraulic loading head (3); the pressure sensing devices (7, 8 and 9) are two large cylinders and two small cylinders, the large cylinder is 100mm in diameter, the height is 50mm, the small cylinder is 60mm in diameter and 20mm in height, the maximum pressure capable of being borne is 100MPa, hydraulic oil is filled in the pressure sensing devices to serve as sensing media, and the pressure sensing devices are connected with the hydraulic pump (11) and the hydraulic loading head (3) through a hydraulic pipe (6).
3. The mining in-situ triaxial experimental apparatus according to claim 1, wherein: the hydraulic loading head (3) is connected with the hydraulic pipe (6) through a liquid inlet, one side of the hydraulic loading head (3) is close to a shell consisting of rigid iron plates, the other side of the hydraulic loading head is close to the rigid supporting iron plate (2), and the other side of the rigid supporting iron plate (2) is close to a coal sample (13); the hydraulic loading head (3) achieves pressure balance through hydraulic oil in the hydraulic pipe (6) and the pressure sensing devices (7, 8 and 9).
4. The mining in-situ triaxial experimental apparatus according to claim 1, wherein: the size of the coal body sample (13) is 150mm multiplied by 150mm, the integral complete surface of the coal body sample is basically smooth, and no obvious crack exists.
5. The mining in-situ triaxial experimental apparatus according to claim 1, wherein: the hydraulic loading head (3) is characterized by being provided with a large cylinder and a small cylinder, and a liquid inlet is formed in the outer side of the large cylinder for injecting hydraulic oil; the pressure borne by the stress ends on the two sides is controlled by injecting hydraulic oil into the hydraulic loading head (3); the diameters of the two cylinders are respectively 100mm and 60 mm; the diameter height of the larger cylinder is 50mm, and the height of the smaller cylinder is 20 mm; one side of the hydraulic loading head (3) is in close contact with the rigid support iron plate (2), and the other side is in close contact with the portable rigid iron box.
6. The mining in-situ triaxial experimental apparatus according to claim 1, wherein: the pressure sensor (1) has the size of 110mm multiplied by 40mm, one side of the pressure sensor is tightly contacted with the rigid supporting iron plate (2), and the other side of the pressure sensor is tightly contacted with the portable rigid iron box (12).
7. The mining in-situ triaxial experimental apparatus according to claim 1, wherein: the stress acquisition instrument (5) is provided with 3 channels, can simultaneously acquire data of 3 pressure sensors (1), can store the data in real time through a USB data memory, and can also be connected with an existing substation of a coal mine safety monitoring system through a standard signal output interface to transmit the data to the ground in real time.
8. The mining in-situ triaxial experimental apparatus according to claim 1, wherein: the portable rigid iron box (12) is 300mm multiplied by 300mm, and the side surface of the iron box is provided with a hole with the diameter of 20mm for connecting a liquid supply pipe (6) and a lead (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922022914.9U CN212321305U (en) | 2019-11-21 | 2019-11-21 | Mining normal position triaxial experimental apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922022914.9U CN212321305U (en) | 2019-11-21 | 2019-11-21 | Mining normal position triaxial experimental apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212321305U true CN212321305U (en) | 2021-01-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922022914.9U Expired - Fee Related CN212321305U (en) | 2019-11-21 | 2019-11-21 | Mining normal position triaxial experimental apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212321305U (en) |
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2019
- 2019-11-21 CN CN201922022914.9U patent/CN212321305U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210108 Termination date: 20211121 |
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| CF01 | Termination of patent right due to non-payment of annual fee |