CN116165062A - Coalbed rock deformation and crack expansion detection device under different unloading conditions - Google Patents
Coalbed rock deformation and crack expansion detection device under different unloading conditions Download PDFInfo
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- CN116165062A CN116165062A CN202211357385.8A CN202211357385A CN116165062A CN 116165062 A CN116165062 A CN 116165062A CN 202211357385 A CN202211357385 A CN 202211357385A CN 116165062 A CN116165062 A CN 116165062A
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- 239000011435 rock Substances 0.000 title claims abstract description 77
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- 239000003245 coal Substances 0.000 claims abstract description 71
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- 238000000429 assembly Methods 0.000 claims abstract description 4
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- 230000000149 penetrating effect Effects 0.000 claims abstract description 4
- 238000007789 sealing Methods 0.000 claims description 73
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- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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Abstract
The invention discloses a coalbed rock deformation and crack expansion detection device under different unloading conditions, which comprises: supporting a machine table; the upper fixing frame is vertically arranged on one side of the upper end face of the supporting machine table in a relatively rotatable manner; the outer box body is fixed on one side, far away from the upper fixing frame, of the upper end face of the supporting machine table and is used for carrying a coal bed rock sample; the stress loading and unloading assemblies are symmetrically arranged, each stress loading and unloading assembly is vertically fixed on the supporting machine table, and one end of each stress loading and unloading assembly is connected to the outer box body in a penetrating way and is abutted against and contacted with the coal bed rock mass sample; the external drilling device is vertically arranged on the upper fixing frame, an inner hole site is formed in the middle of the upper end face of the outer box body, and the external drilling device vertically penetrates through the inner hole site and is used for vertically drilling a coal bed rock mass sample; and the deformation and crack expansion detection assembly is vertically arranged on the other side of the upper fixing frame.
Description
Technical Field
The invention belongs to the technical field of coal mine fission experiment simulation equipment, and particularly relates to a coalbed rock deformation and crack expansion detection device under different unloading conditions.
Background
The existence of the fractured coal rock mass in the coal mine seriously affects the strength characteristics and permeability characteristics of the coal rock mass, and in the practice of coal mine rock mass engineering, the deformation of the rock mass under the action of stress affects the fracture opening degree and seepage property thereof, so that the permeability and deformation property of surrounding rock are changed, and therefore, the research and analysis of the influence on the fracture mechanical characteristics of the rock mass under the action of different stress loading and unloading are very necessary; at present, most triaxial stress loading equipment can realize the effect of loading and unloading three-dimensional stress on a fractured coal rock mass, but the method is relatively difficult in the deformation detection or fracture expansion detection of the fractured coal rock mass, the fine deformation generated under different stress effects in the fractured coal rock mass is difficult to accurately detect through naked eyes or measuring equipment, and particularly, the method is more difficult to accurately position for partial fracture expansion in the middle of the coal rock mass. Therefore, a person skilled in the art provides a coalbed rock mass deformation and crack expansion detection device under different unloading conditions so as to solve the problems in the background art.
Disclosure of Invention
In order to achieve the above purpose, the present invention provides the following technical solutions: coalbed rock mass deformation and crack expansion detection device under different unloading conditions comprises:
supporting a machine table;
the upper fixing frame is vertically arranged on one side of the upper end face of the supporting machine table in a relatively rotatable manner, a driving motor is arranged in the supporting machine table, and the output end of the driving motor is connected with the upper fixing frame for transmission through a gear meshing effect;
the outer box body is fixed on one side, far away from the upper fixing frame, of the upper end face of the supporting machine table and is used for carrying a coal bed rock sample;
the stress loading and unloading assemblies are symmetrically arranged, each stress loading and unloading assembly is vertically fixed on the supporting machine table, and one end of each stress loading and unloading assembly is connected to the outer box body in a penetrating way and is abutted against and contacted with the coal bed rock mass sample;
the external drilling device is vertically arranged on the upper fixing frame, an inner hole site is formed in the middle of the upper end face of the outer box body, and the external drilling device vertically penetrates through the inner hole site and is used for vertically drilling a coal bed rock mass sample; and
the deformation expansion detection assembly is vertically arranged on the other side of the upper fixing frame, and after the stress loading and unloading assembly finishes the stress loading and unloading of the coal bed rock mass sample, the deformation expansion detection assembly stretches into the coal bed rock mass sample through a drilling hole and performs deformation expansion detection on the coal bed rock mass sample in a segmented mode.
Further preferably, the stress loading and unloading assembly includes:
the side stand columns are vertically fixed on the supporting machine table, and guide rods are fixed on the side stand columns in parallel;
the driving piece is arranged on the guide rod in a relatively sliding way, a transmission chain plate is arranged on the side upright post, and one end of the transmission chain plate is connected with the driving piece;
the hydraulic telescopic cylinder is transversely fixed on the driving piece;
the bearing plate is vertically fixed at the output end of the hydraulic telescopic cylinder; and
the stress loading rods are vertically arranged and are transversely penetrated and fixed on the bearing plate, and one end of each stress loading rod is abutted against and contacted with the coal bed rock mass sample.
Further, preferably, the method further comprises:
the top plate piece is arranged in one-to-one correspondence with each stress loading rod, the stress loading rods are constructed into a two-section telescopic structure, and a plurality of supporting springs are further connected between the top plate piece and the stress loading rods.
Further, preferably, the deformation and crack expansion detection assembly includes:
the positioning seat can be arranged on the upper fixing frame in a relative transverse sliding manner;
the telescopic guide frame is vertically fixed in the middle of the positioning seat, and one end of the telescopic guide frame slides and stretches into a coal bed rock mass sample drilling hole;
the upper sealing disc and the lower sealing disc are coaxially fixed below the telescopic guide frame, and the upper sealing disc is positioned above the lower sealing disc;
the inner connecting frame is vertically and symmetrically connected between the upper sealing disc and the lower sealing disc, and an electric telescopic rod is also coaxially connected between the upper sealing disc and the lower sealing disc;
the water inlet main pipe is vertically communicated with the upper sealing disc, and the other end of the water inlet main pipe is communicated with an external water tank and is used for draining and supplying a sealing gap between the upper sealing disc and the lower sealing disc; and
the drainage main pipe is vertically communicated with the lower sealing disc, telescopic pipes are arranged on the drainage main pipe and the water inlet main pipe, and the drainage main pipe is used for timely discharging the water discharge body.
Further, preferably, a plurality of side flow holes are formed in the drill holes in the coal bed rock mass sample in a circumferential array, and the cross section of each side flow hole is of an inverted trapezoid structure.
Further, preferably, the upper sealing plate and the lower sealing plate have the same composition structure; wherein, upper sealing disk includes:
a fixed plate;
the positioning plates are arranged in a plurality of circumferential arrays, and each positioning plate is vertically arranged on the outer side of the fixed disc;
the fine tuning telescopic rods are transversely and symmetrically embedded and fixed in the fixed disc, and the output ends of the fine tuning telescopic rods are connected and fixed with the positioning plate;
the main pressing plates are arranged corresponding to the positioning plates, an inner spring is transversely connected between the main pressing plates and the positioning plates, and one end of the inner spring is connected with the main pressing plates through an inner connecting piece;
the linkage rods are transversely fixed in the fixed disc, are arranged in one-to-one correspondence with the main pressing plates, and have a two-section telescopic structure in cross section; and
the sealing ring sleeve is connected to the lower part of the fixed disc, and one end of the sealing ring sleeve penetrates through the linkage rod and is connected with the main pressing plate.
Further, preferably, the method further comprises:
the stress detection piece is embedded and arranged between the main pressing plate and the internal connecting piece and is used for detecting the contact stress between the coal bed rock mass sample and the positioning plate.
Further, preferably, the method further comprises:
the air bag ring pieces are arranged in a plurality, each air bag ring piece is embedded and fixed on the main pressing plate, an air flow pipe is transversely arranged on the fixing plate, one end of the air flow pipe is communicated with each air bag ring piece, and the other end of the air flow pipe is connected with an external air pump.
Compared with the prior art, the invention has the beneficial effects that:
in the invention, an outer box body is used for holding the coal bed rock mass sample, and stress loading or unloading is carried out on the coal bed rock mass sample from all directions through a stress loading and unloading assembly under different intensities; the external drilling device can vertically drill the coal bed rock mass sample before, and the deformation expansion detection assembly preferentially detects the drilling shape in the coal bed rock mass sample and the seepage characteristic of the coal bed rock mass sample through the drilling; after the stress loading and unloading assembly finishes stress loading and unloading, the deformation expansion detection assembly stretches into the drill hole again to detect the integral deformation of the coal bed rock mass sample and the expansion degree of the internal fracture so as to form a comparison experiment, wherein a plurality of stress loading rods are arranged on the bearing plate, and each stress loading rod can carry out stress adjustment with different intensities from a plurality of positioning points, so that the stress change of the mining face under the coal mine is truly reduced and simulated; the corresponding upper sealing disc and lower sealing disc can be expanded in the drill hole under the expansion and contraction action of the fine-tuning expansion rods, at the moment, after the stress detection parts reach the early warning value, the length of each fine-tuning expansion rod is measured, then the air supply expansion and contraction action of the air bag ring part enables the stress detection parts to reach the limit value, at the moment, the conveying air pressure in the air bag ring part is measured, and therefore the drill hole deformation of the coal bed rock mass sample obtained through later-stage comparison experiments is facilitated; and the water inlet main pipe is used for draining and supplying the sealing gap formed by combining the upper sealing disc and the lower sealing disc, and the internal crack expansion degree and expansion point positions of the coal bed rock mass sample are obtained by measuring the seepage velocity of the coal bed rock mass sample.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic diagram of a stress loading and unloading assembly according to the present invention;
FIG. 3 is a schematic structural diagram of a deformation and crack expansion detection assembly according to the present invention;
FIG. 4 is a schematic view of the structure of the upper sealing disk in the present invention;
in the figure: the device comprises a supporting machine table 1, an upper fixing frame 2, an outer box body 3, a driving motor 4, a stress loading and unloading assembly 5, a side upright post 51, a transmission chain plate 52, a hydraulic telescopic cylinder 53, a bearing plate 54, a stress loading rod 55, a top plate 56, a supporting spring 57, a 6-deformation expanding crack detection assembly, a 61 positioning seat, a 62 telescopic guide frame, a 63 water inlet main pipe, a 64 water outlet main pipe, a 65 inner connecting frame, a 66 side flow hole, a 7 upper sealing disc, a 71 fixing disc, a 72 positioning plate, a 73 main pressing plate, a 74 inner spring, a 75 fine adjustment telescopic rod, a 76 connecting rod, a 77 sealing ring sleeve, a 78 air bag ring piece, a 79 air flow pipe, a 8 lower sealing disc.
Detailed Description
Referring to fig. 1, in an embodiment of the present invention, a device for detecting deformation and crack expansion of a coal bed rock under different unloading conditions includes:
supporting a machine table 1;
the upper fixing frame 2 is vertically arranged on one side of the upper end face of the supporting machine 1 in a relatively rotatable manner, a driving motor 4 is arranged in the supporting machine 1, and the output end of the driving motor 4 is connected with the upper fixing frame 2 for transmission through a gear meshing effect;
the outer box body 3 is fixed on one side, far away from the upper fixing frame 2, of the upper end face of the supporting machine table 1 and is used for carrying a coal bed rock sample;
the stress loading and unloading assemblies 5 are symmetrically arranged, each stress loading and unloading assembly 5 is vertically fixed on the supporting machine table 1, and one end of each stress loading and unloading assembly 5 is connected to the outer box body 3 in a penetrating way and is abutted against and contacted with a coal bed rock mass sample;
the external drilling device (not shown in the figure) is vertically arranged on the upper fixing frame 2, an inner hole site is formed in the middle of the upper end face of the outer box body 3, and the external drilling device vertically penetrates through the inner hole site and is used for vertically drilling a coal bed rock mass sample; and
the deformation and crack expansion detection assembly 6 is vertically arranged on the other side of the upper fixing frame 2, and after the stress loading and unloading assembly 5 finishes the stress loading and unloading of the coal bed rock mass sample, the deformation and crack expansion detection assembly 6 stretches into the coal bed rock mass sample through a drill hole and performs deformation and crack expansion detection on the coal bed rock mass sample in a segmented mode.
In this embodiment, the stress loading/unloading assembly 5 includes:
the side stand column 51 is vertically fixed on the supporting machine table 1, and guide rods are fixed on the side stand column 51 in parallel;
the driving piece is arranged on the guide rod in a relatively sliding way, a transmission chain plate 52 is arranged on the side upright post 51, and one end of the transmission chain plate 52 is connected with the driving piece;
a hydraulic telescopic cylinder 53 transversely fixed to the driving member;
a receiving plate 54 vertically fixed to the output end of the hydraulic telescopic cylinder 53; and
the stress loading rods 55 are vertically arranged, each stress loading rod 55 transversely penetrates through and is fixed on the bearing plate 54, and one end of each stress loading rod 55 is abutted against and contacted with the coalbed rock mass sample.
As a preferred embodiment, further comprising:
the top plate 56 is arranged in one-to-one correspondence with each stress loading rod 55, the stress loading rods 55 are constructed into two-section telescopic structures, and a plurality of supporting springs 57 are further connected between the top plate 56 and the stress loading rods 55, wherein the top plate can be driven to move towards one side close to the coal seam rock mass sample by the transverse telescopic action of the hydraulic telescopic cylinder preferentially, and can be abutted against and contacted with the coal seam rock mass sample at the moment, and the supporting springs are compressed to different degrees by the telescopic regulating action of each stress loading rod, so that different stress loading and unloading actions at multiple points are provided.
In this embodiment, the deformation and crack expansion detection assembly 6 includes:
the positioning seat 61 is arranged on the upper fixing frame 2 in a relatively transverse sliding manner;
the telescopic guide frame 62 is vertically fixed in the middle of the positioning seat 61, and one end of the telescopic guide frame 62 slides and stretches into a coal bed rock mass sample drilling hole;
an upper sealing disc 7 and a lower sealing disc 8 are coaxially fixed below the telescopic guide frame 62, and the upper sealing disc 7 is positioned above the lower sealing disc 8;
the inner connecting frame 65 is vertically and symmetrically connected between the upper sealing disc 7 and the lower sealing disc 8, and an electric telescopic rod is also coaxially connected between the upper sealing disc 7 and the lower sealing disc 8;
a water inlet main pipe 63 vertically communicated with the upper sealing disk 7, wherein the other end of the water inlet main pipe 63 is communicated with an external water tank and is used for draining and supplying a sealing gap between the upper sealing disk 7 and the lower sealing disk 8; and
the drainage main pipe 64 is vertically communicated with the lower sealing disc 8, telescopic pipes are arranged on the drainage main pipe 64 and the water inlet main pipe 63, the drainage main pipe 64 is used for timely discharging drainage bodies, particularly for detecting crack expansion points and crack expansion degrees of coal bed rock mass samples, the telescopic guide frame drives the upper sealing disc and the lower sealing disc to extend into a value drilling hole step by step, at the moment, the upper sealing disc and the lower sealing disc can be sealed and attached in the hole, the water inlet main pipe is used for carrying out internal water injection on the upper sealing disc and the lower sealing disc, and the seepage characteristics of the coal bed rock mass samples are measured; the stress is adjusted by the stress loading and unloading assembly, and seepage characteristics of the coal bed rock mass sample are measured again to form contrast, so that crack expansion points and crack expansion degree can be effectively positioned, the vertical distance between the upper sealing disc and the lower sealing disc can be adjusted by the expansion of the electric telescopic rod, and the positioning detection precision is improved.
In this embodiment, a plurality of side flow holes 66 are further formed in a circumferential array in a drilled hole in a coal seam rock mass sample, and the cross section of each side flow hole 66 is in an inverted trapezoid structure, especially for a part of the coal seam rock mass sample with low overall seepage characteristics and relatively high internal compactness, in order to reduce experimental difficulty, under the action of different stress loading and unloading, the internally generated cracks can be preferentially communicated with the side flow holes, especially in crack expansion detection, a water source can directly flow into the cracks through the side flow holes, seepage is performed, so that crack points are amplified, and detection is convenient.
In this embodiment, the upper sealing disc 7 and the lower sealing disc 8 have the same composition structure; wherein the upper sealing disk 7 comprises:
a fixed plate 71;
the positioning plates 72 are arranged in a plurality of circumferential arrays, and each positioning plate 72 is vertically arranged outside the fixed disc 71;
the fine adjustment telescopic rods 75 are transversely and symmetrically embedded and fixed in the fixed disc 71, and the output end of each fine adjustment telescopic rod 75 is connected and fixed with the positioning plate 72;
the main pressing plates 73 are arranged corresponding to the positioning plates 72, an inner spring 74 is transversely connected between the main pressing plates 73 and the positioning plates 72, and one end of the inner spring 74 is connected with the main pressing plates 73 through an inner connecting piece;
the linkage rods 76 are transversely fixed in the fixed disc 71 and are arranged in one-to-one correspondence with the main pressing plates 73, and the cross sections of the linkage rods 76 are of two-section telescopic structures; and
and a sealing ring sleeve 77, which is connected below the fixed disc 71, wherein one end of the sealing ring sleeve 77 passes through the linkage rod 76 and is connected with the main pressing plate 73.
As a preferred embodiment, further comprising:
the stress detection piece is embedded between the main pressing plate 73 and the internal connecting piece and is used for detecting the contact stress between the coal bed rock mass sample and the positioning plate 72, wherein the early warning value and the limit value of the stress detection piece are preferably set, and the early warning value is that the inner wall of the drill hole of the coal bed rock mass sample is subjected to early warning under the action of the pressure of the main pressing plate; and the limit value is the pressure bearing limit of the inner wall of the coal bed rock mass sample drilling hole under the action of the main pressing plate pressure.
In this embodiment, the method further includes:
the air bag ring members 78 are arranged in a plurality, each air bag ring member 78 is embedded and fixed on the main pressing plate 73, an air flow pipe 79 is transversely arranged on the fixed disc 71, one end of each air flow pipe 79 is communicated with each air bag ring member 78, the other end of each air flow pipe 79 is connected with an external air pump (not shown in the figure), wherein the upper sealing disc and the lower sealing disc are expanded in a drill hole under the telescopic action of the fine adjustment telescopic rod, when the stress detection member reaches an early warning value, the length of each fine adjustment telescopic rod is measured, and then the air supply expansion and contraction action of the air bag ring member enables the stress detection member to reach a limit value, at the moment, the conveying air pressure in the air bag ring member is measured, so that the drill hole deformation of a coal bed rock sample obtained by a later comparison experiment is facilitated; meanwhile, the air bag ring piece has a high waterproof and isolation effect, and the tightness is improved.
Specifically, in deformation and expansion crack detection experiments on coal stratum under different unloading conditions, coal stratum samples are extracted from underground mining surfaces of coal mines and placed in an outer box body, vertical drilling is carried out on the coal stratum samples through an external drilling device, at the moment, the deformation and expansion crack detection assembly can preferentially carry out primary seepage characteristic detection on the coal stratum samples, the stress loading and unloading assembly is abutted against and contacted with the coal stratum samples, and stress loading and unloading adjustment with different intensities is carried out on the coal stratum samples; the deformation expansion detection assembly stretches into the drill hole again to detect the overall deformation of the coal bed rock mass sample and the expansion degree of the internal fracture, so that a comparison experiment is formed, and the internal structural change and fracture generation of the coal bed under the stress change of the underground mining face of the coal mine are simulated.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (8)
1. Coalbed rock mass deformation expands splits detection device under different uninstallation conditions, its characterized in that: it comprises the following steps:
a supporting machine (1);
the upper fixing frame (2) is vertically arranged on one side of the upper end face of the supporting machine (1) in a relatively rotatable manner, a driving motor (4) is arranged in the supporting machine (1), and the output end of the driving motor (4) is connected with the upper fixing frame (2) for transmission through a gear meshing effect;
the outer box body (3) is fixed on one side, far away from the upper fixing frame (2), of the upper end face of the supporting machine table (1) and is used for carrying a coal bed rock sample;
the stress loading and unloading assemblies (5) are symmetrically arranged, each stress loading and unloading assembly (5) is vertically fixed on the supporting machine table (1), and one end of each stress loading and unloading assembly (5) is connected to the outer box body (3) in a penetrating way and is abutted against and contacted with a coal bed rock mass sample;
the external drilling device is vertically arranged on the upper fixing frame (2), an inner hole site is formed in the middle of the upper end face of the outer box body (3), and the external drilling device vertically penetrates through the inner hole site and is used for vertically drilling a coal bed rock mass sample; and
the deformation and crack expansion detection assembly (6) is vertically arranged on the other side of the upper fixing frame (2), and the deformation and crack expansion detection assembly (6) stretches into the coal bed rock sample through a drilling hole and performs deformation and crack expansion detection on the coal bed rock sample in a segmented mode after the stress loading and unloading assembly (5) finishes the stress loading and unloading of the coal bed rock sample.
2. The coalbed rock mass deformation and crack propagation detection device under different unloading conditions according to claim 1, wherein: the stress relief assembly (5) comprises:
the side stand column (51) is vertically fixed on the supporting machine table (1), and guide rods are fixed on the side stand column (51) in parallel;
the driving piece is arranged on the guide rod in a relatively sliding way, a transmission chain plate (52) is arranged on the side upright post (51), and one end of the transmission chain plate (52) is connected with the driving piece;
a hydraulic telescopic cylinder (53) transversely fixed on the driving member;
the bearing plate (54) is vertically fixed at the output end of the hydraulic telescopic cylinder (53); and
the stress loading rods (55) are vertically arranged, each stress loading rod (55) transversely penetrates through and is fixed on the bearing plate (54), and one end of each stress loading rod (55) is abutted against and contacted with the coal bed rock mass sample.
3. The coalbed rock mass deformation and crack propagation detection device under different unloading conditions according to claim 2, wherein: further comprises:
the top plate pieces (56) are arranged in one-to-one correspondence with the stress loading rods (55), the stress loading rods (55) are constructed into a two-section telescopic structure, and a plurality of supporting springs (57) are further connected between the top plate pieces (56) and the stress loading rods (55).
4. The coalbed rock mass deformation and crack propagation detection device under different unloading conditions according to claim 1, wherein: the deformation and crack expansion detection assembly (6) comprises:
the positioning seat (61) can be arranged on the upper fixing frame (2) in a relatively transverse sliding manner;
the telescopic guide frame (62) is vertically fixed in the middle of the positioning seat (61), and one end of the telescopic guide frame (62) slides and stretches into a coal bed rock sample drilling hole;
the upper sealing disc (7) and the lower sealing disc (8) are coaxially fixed below the telescopic guide frame (62), and the upper sealing disc (7) is positioned above the lower sealing disc (8);
the inner connecting frame (65) is vertically and symmetrically connected between the upper sealing disc (7) and the lower sealing disc (8), and an electric telescopic rod is also coaxially connected between the upper sealing disc (7) and the lower sealing disc (8);
the water inlet main pipe (63) is vertically communicated with the upper sealing disc (7), and the other end of the water inlet main pipe (63) is communicated with an external water tank and is used for draining and supplying a sealing gap between the upper sealing disc (7) and the lower sealing disc (8); and
the drainage main pipe (64) is vertically communicated with the lower sealing disc (8), telescopic pipes are arranged on the drainage main pipe (64) and the water inlet main pipe (63), and the drainage main pipe (64) is used for timely discharging the drainage body.
5. The coalbed rock mass deformation and crack propagation detection device under different unloading conditions according to claim 4, wherein: a plurality of side flow holes (66) are formed in the drill holes in the coal bed rock mass sample in a circumferential array, and the cross section of each side flow hole (66) is of an inverted trapezoid structure.
6. The coalbed rock mass deformation and crack propagation detection device under different unloading conditions according to claim 4, wherein: the upper sealing disc (7) and the lower sealing disc (8) have the same composition structure; wherein the upper sealing disk (7) comprises:
a fixed plate (71);
the positioning plates (72) are arranged in a plurality of circumferential arrays, and each positioning plate (72) is vertically arranged outside the fixed disc (71);
the fine adjustment telescopic rods (75) are transversely and symmetrically embedded and fixed in the fixed disc (71), and the output end of each fine adjustment telescopic rod (75) is connected and fixed with the positioning plate (72);
the main pressing plates (73) are arranged corresponding to the positioning plates (72), inner springs (74) are transversely connected between the main pressing plates (73) and the positioning plates (72), and one ends of the inner springs (74) are connected with the main pressing plates (73) through inner connecting pieces;
the linkage rods (76) are transversely fixed in the fixed disc (71) and are arranged in one-to-one correspondence with the main pressing plates (73), and the cross sections of the linkage rods (76) are of two-section telescopic structures; and
the sealing ring sleeve (77) is connected below the fixed disc (71), and one end of the sealing ring sleeve (77) penetrates through the linkage rod (76) and is connected with the main pressing plate (73).
7. The coalbed rock mass deformation and crack propagation detection device under different unloading conditions according to claim 6, wherein: further comprises:
and the stress detection piece is embedded between the main pressing plate (73) and the internal connecting piece and is used for detecting the contact stress between the coal bed rock mass sample and the positioning plate (72).
8. The coalbed rock mass deformation and crack propagation detection device under different unloading conditions according to claim 7, wherein: further comprises:
the air bag ring members (78) are arranged in a plurality, each air bag ring member (78) is embedded and fixed on the main pressing plate (73), an air flow pipe (79) is transversely arranged on the fixing plate (71), one end of each air flow pipe (79) is communicated with each air bag ring member (78), and the other end of each air flow pipe (79) is connected with an external air pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN117387557A (en) * | 2023-12-08 | 2024-01-12 | 中国云南路建集团股份公司 | Highway construction quality detection device |
| CN117387557B (en) * | 2023-12-08 | 2024-03-12 | 中国云南路建集团股份公司 | Highway construction quality detection device |
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