CN110043210B - Rock mass drilling sampling stress fidelity device and method under high ground stress - Google Patents

Rock mass drilling sampling stress fidelity device and method under high ground stress Download PDF

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Publication number
CN110043210B
CN110043210B CN201910369133.9A CN201910369133A CN110043210B CN 110043210 B CN110043210 B CN 110043210B CN 201910369133 A CN201910369133 A CN 201910369133A CN 110043210 B CN110043210 B CN 110043210B
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China
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drilling machine
drilling
rock mass
drill bit
stress
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CN201910369133.9A
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Chinese (zh)
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CN110043210A (en
Inventor
刘杰
孙涛
叶志强
高素芳
黎照
张罗送
李洪亚
谢晓康
唐洪宇
兰俊
高进
吴傲
陈诚
贺梦玲
田港
周预非
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China Three Gorges University
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China Three Gorges University
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B25/00Apparatus for obtaining or removing undisturbed cores, e.g. core barrels, core extractors
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B49/00Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
    • E21B49/02Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells by mechanically taking samples of the soil

Abstract

The invention relates to a device and a method for sampling stress of a rock mass drilling hole under high ground stress, which comprises a drill bit, wherein the top of the drill bit is provided with sawteeth for cutting the rock mass; the drill bit is arranged at the head of the drilling machine, a threaded rod penetrates through the drilling machine, a high-strength blade for cutting a rock body is arranged in the drilling machine, and a rotating rod penetrating through the high-strength blade is arranged in the drilling machine; the drilling machine is characterized in that a steel rod is arranged in the drilling machine and penetrates through a drill bit, a first spring is arranged at the other end of the steel rod, the other end of the first spring is connected with a ball body, the other end of the ball body is in contact fit with a protruding part of the sawtooth groove, second springs are uniformly arranged at two ends of the sawtooth groove respectively, and the other end of each second spring is in contact fit with a fixed baffle. The device is used for taking out a rock body with high stress fidelity in a high ground stress state by matching a special drilling machine with an internal blade.

Description

Rock mass drilling sampling stress fidelity device and method under high ground stress
Technical Field
The invention relates to a device and a method for fidelity sampling stress of a rock mass drilling hole under high ground stress, and belongs to the technical field of rock mass drilling sampling.
Background
With the increasing decrease of resources on the earth surface and in shallow underground parts, the mining in deep underground parts becomes a necessary trend for mining mineral resources at home and abroad. The rock mechanics problem generated in the deep mining engineering is the focus of research in mining and rock mechanics at home and abroad at present, and how to solve the core caking phenomenon in the deep mining is a high-difficulty subject faced by people. Therefore, it is imperative to develop a solution to prevent the core-caking phenomenon in deep mining.
Disclosure of Invention
The invention aims to solve the technical problem of providing a rock mass drilling sampling stress fidelity device and method under high ground stress.
In order to solve the technical problems, the invention provides the following technical scheme: a rock mass drilling sampling stress fidelity device under high ground stress comprises a drill bit, wherein sawteeth for cutting a rock mass are arranged at the top of the drill bit; the drill bit is arranged at the head of the drilling machine, a threaded rod penetrates through the drilling machine, a high-strength blade for cutting a rock body is arranged in the drilling machine, and a rotating rod penetrating through the high-strength blade is arranged in the drilling machine; the drilling machine is characterized in that a steel rod is arranged in the drilling machine and penetrates through a drill bit, a first spring is arranged at the other end of the steel rod, the other end of the first spring is connected with a ball body, the other end of the ball body is in contact fit with a protruding part of the sawtooth groove, second springs are uniformly arranged at two ends of the sawtooth groove respectively, and the other end of each second spring is in contact fit with a fixed baffle.
The drill bit is formed by combining an assembling structure and can be disassembled; the drill bit has a thickness.
The side wall of the drill bit is provided with a threaded hole, the threaded hole and the threaded rod form threaded connection, and the drill bit is detachably fixed on the drill bit.
The high-strength blade used for cutting rock bodies in the drilling machine is rectangular, the length of the high-strength blade is equal to half of the inner diameter of the drilling machine, and the width of the high-strength blade is smaller than the ring width of the drilling machine.
The diameter of the top end of the steel rod is larger than that of the middle part of the steel rod.
Protruding parts at two ends of the sawtooth groove are equidistant, and the inner diameter of the initial protruding part is smaller than that of the sphere.
The second spring adopts various different strengths and generates pressure on the steel rod.
The use method of the rock mass drilling sampling stress fidelity device under high ground stress is characterized by comprising the following steps:
step 1: selecting a relatively flat face on a mountain, wherein the selected area is larger than the area of a rock body to be taken out, and cutting the weathered rock on the surface layer of the selected area by using a cutting machine to expose the rock inside;
step 2: the drilling machine is used for drilling holes in the deep part of the rock mass, and the steel rod penetrating through the drill bit of the drilling machine props against the rock mass drilled by the drill bit of the drilling machine while drilling the holes, so that the phenomenon of core caking caused by differential unloading and rebounding in the drilling process is prevented;
step 3: the first spring connected with the ball body props against the steel rod at the tail end of the drilling machine, the ball body and the convex parts of the sawtooth groove interact with each other, the second springs on two sides of the sawtooth groove are compressed along with the increase of force in the drilling process, the distance between the convex parts is increased, when the force is larger than a threshold value, the distance between the convex parts is just larger than the diameter of the ball body, and the ball body slides into the next convex part of the sawtooth groove and sequentially moves downwards until the drilling machine drills the whole rock sample;
step 4: stopping drilling after drilling is finished, and driving the blade to cut the rock mass through a rotating rod of which the side wall of the rotary drilling machine is connected with the blade;
step 5: the drilling machine is taken out of the rock mass and placed on a plane, two threaded rods with extremely high strength in the hole in the middle solid part of the drilling machine are drawn out, and the rock mass with required stress fidelity is taken out by disassembling each part of the drilling machine.
The invention has the following beneficial effects:
1. the drill bit with a certain thickness is formed by assembling a plurality of parts, can be effectively assembled and disassembled, and can be assembled by selecting a plurality of sub-drill bits according to the sampling requirement.
2. According to the invention, two threaded rods with extremely high strength penetrate through the holes in the side wall of the drill bit of the drilling machine, and the threaded rods enter through the threads on the side wall of the drill bit in a rotating manner, so that all the drill bits can be fixed, and the inner drill and the outer drill can be synchronously rotated in the drilling process. The drilling machine is convenient to disassemble in the later period, and the required rock mass part is taken out.
3. The blade used for cutting the rock body in the drilling machine is extremely high in strength, and the situation that the blade is damaged due to the fact that the blade is used for cutting the rock body is avoided.
4. The blade of the invention is fixed on a steel rod penetrating through the side wall of the drill bit of the drilling machine, and the blade can be driven to cut the rock by rotating the steel rod.
5. The high-strength blade for cutting rock mass in the drilling machine is arranged at the position of the disassembly part of the drilling machine, the disassembly surfaces at the head end and the tail end are provided with a group of two opposite blades, and the disassembly surface in the middle is provided with two groups of two opposite blades. And the blades at the head end and the middle part are fixed in distance and cannot slide relatively, and the blades at the two ends of the drill bit can limit the rock mass inside the drill bit to prevent the rock mass from being subjected to core caking.
6. The two ends and the middle detachable position of the drilling machine are provided with grooves for placing blades. The high-strength blades are rectangular, the length of each high-strength blade is equal to half of the inner diameter of the drilling machine, and the width of each high-strength blade is smaller than the ring width of the drilling machine, so that the middle rock body can be completely cut off when the two blades cut.
7. When the high-strength blade used for cutting the rock mass in the drilling machine is installed, the middle point of one end of the high-strength blade is fixed, the rock mass is cut by rotating the steel rod, and the drilling machine is simple and convenient to operate.
8. The top end part of the steel rod penetrating through the drill bit of the drilling machine is thicker than the middle part, and the diameter of the top end part is slightly smaller than that of the inner circle of the drilling machine, so that the steel rod can be used for resisting rocks drilled in the drilling machine, the steel rod can be ensured to be capable of resisting rocks, and the phenomenon that the rocks are crushed due to overlarge rock pressure caused by the small area of the steel rod is avoided.
9. The sphere and the special sawtooth groove have extremely high rigidity and cannot deform in interaction.
10. The springs uniformly arranged on the two sides of the sawtooth groove can adopt springs with different specifications when sampling under different conditions, so that the pressure applied by the middle steel rod of the drill bit can be adjusted.
11. The special sawtooth groove of the invention can provide a fixed pressure for the steel rod through the compression of the springs at the two sides.
12. The distance between the convex parts of the special sawtooth groove is smaller than the diameter of the sphere, the springs on the two sides of the sawtooth groove are compressed along with the increase of the force during interaction, the distance between the convex parts is increased, when the force is larger than a threshold value, the distance between the convex parts is just larger than the diameter of the sphere, the sphere slides into the position between the next convex parts of the sawtooth groove, and a fixed pressure value can be provided for the steel rod.
Drawings
The invention is further illustrated by the following figures and examples.
FIG. 1 is a diagram showing the overall structure of the device of the present invention.
FIG. 2 is a sectional view of the overall structure of the device of the present invention.
Fig. 3 is a detailed structure diagram of the drill bit of the drilling machine.
In the figure: the drill bit 1, the threaded rod 2, the high-strength blade 3, the rotating rod 4, the steel rod 5, the first spring 6, the sphere 7, the sawtooth groove 8, the second spring 9, the fixed baffle 10 and the sawtooth 11.
Detailed Description
Embodiments of the present invention will be further described with reference to the accompanying drawings.
Example 1:
1-3, the rock mass drilling sampling stress fidelity device under high ground stress comprises a drill bit 1, wherein the top of the drill bit 1 is provided with saw teeth 11 for cutting a rock mass; the drilling machine is characterized in that the drill bit 1 is installed at the head of the drilling machine, a threaded rod 2 penetrates through the drilling machine, a high-strength blade 3 for cutting a rock body is arranged in the drilling machine, and a rotating rod 4 penetrating through the high-strength blade 3 is installed in the drilling machine; the drilling machine is characterized in that a steel rod 5 is installed in the drilling machine and penetrates through a drill bit 1, a first spring 6 is installed at the other end of the steel rod 5, the other end of the first spring 6 is connected with a sphere 7, the other end of the sphere 7 is in contact fit with a protruding portion of a sawtooth groove 8, second springs 9 are evenly arranged at two ends of the sawtooth groove 8 respectively, and the other end of each second spring 9 is in contact fit with a fixed baffle 10. The invention relates to a device and a method for sampling stress of a rock mass drilling hole under high ground stress, which are characterized in that a special drilling machine is used for drilling a hole into the rock mass under high ground stress, a thicker part at the top end of a steel rod penetrating through a drilling machine drill bit is used for propping against the rock mass in the drilling machine, the drill bit is driven into the rock mass in the drilling process, meanwhile, the rock mass in the drill bit can apply pressure to the steel rod, the steel rod transmits the force to a ball body through a high-strength spring after being stressed, the ball body props against a bulge part of two special sawtooth grooves with extremely high rigidity to provide an outward force to the sawtooth grooves, the springs at two ends of the sawtooth grooves provide inward force to the sawtooth grooves, the springs at two ends of the sawtooth grooves can be gradually compressed, the distance between the bulge parts of the sawtooth grooves can be gradually increased, when the force applied to the sawtooth grooves by the ball body reaches a certain threshold value, the distance between the sawtooth grooves can be larger than the diameter of the ball, and the sawtooth grooves can sequentially supply fixed pressure to the steel rod, and finally, the rock mass in the drilling machine is cut and sampled by the high-strength blade in the drilling machine. The mechanical problems of the prior art that the phenomenon of formation of a rock core cake is caused by difference unloading resilience in the drilling process in the high ground stress drilling process and the like can be effectively solved.
Furthermore, the drill bit 1 is formed by combining an assembling structure and can be disassembled; the drill bit 1 has a certain thickness. Can be effectively assembled and disassembled.
Furthermore, the side wall of the drill bit 1 is provided with a threaded hole, the threaded hole and the threaded rod 2 form threaded connection, and the drill bit 1 is detachably fixed on the drill bit. The two threaded rods 2 with extremely high strength penetrating through the drilling machine are placed in the holes in the side wall of the drill bit of the drilling machine, and the threaded rods rotate to enter through the threads in the holes, so that all the drill bits can be fixed, and all the drill bits can be synchronously rotated in the drilling process. Meanwhile, the drill bit 1 of the drilling machine can be conveniently disassembled at the later stage, and the part of the rock mass needed by people can be taken out.
Further, the shape of the high-strength blade 3 used for cutting rock mass in the drilling machine is rectangular, the length of the high-strength blade is equal to half of the inner diameter of the drilling machine, and the width of the high-strength blade is smaller than the ring width of the drilling machine. The high-strength blade 3 is mounted with its midpoint at one end fixed.
Further, the diameter of the top end of the steel rod 5 is larger than that of the middle part.
Furthermore, the convex parts at the two ends of the sawtooth groove 8 are equidistant, and the inner diameter of the initial convex part is smaller than that of the sphere 7.
Further, the second spring 9 has various strengths and generates pressure on the steel rod 5. The uniformly arranged springs 9 are connected with both ends of the sawtooth groove 8, and the pressure applied by the steel rod 5 in the drill bit can be selected by selecting the springs 9 with different strengths under different high ground stress conditions.
Example 2:
the use method of the rock mass drilling sampling stress fidelity device under high ground stress is characterized by comprising the following steps:
step 1: selecting a relatively flat face on a mountain, wherein the selected area is larger than the area of a rock body to be taken out, and cutting the weathered rock on the surface layer of the selected area by using a cutting machine to expose the rock inside;
step 2: the drilling machine is used for drilling holes in the deep part of the rock mass, and the steel rod 5 penetrating through the drill bit of the drilling machine props against the rock mass drilled by the drill bit of the drilling machine while drilling the holes, so that the phenomenon of core caking caused by differential unloading and rebounding in the drilling process is prevented;
step 3: the first spring 6 connected with the ball body 7 props against the steel rod 5 at the tail end of the drilling machine, the ball body 7 interacts with the convex parts of the sawtooth groove 8, the second springs 9 at two sides of the sawtooth groove 8 are compressed along with the increase of force in the drilling process, the distance between the convex parts is increased, when the force is larger than a threshold value, the distance between the convex parts is just larger than the diameter of the ball body 7, and the ball body slides into the position between the next convex parts of the sawtooth groove 8 and sequentially moves downwards until the drilling machine drills the whole rock sample;
step 4: stopping drilling after drilling is finished, and driving the blade 3 to cut the rock body through a rotating rod 4 which is connected with the blade on the side wall of the rotary drilling machine;
step 5: the drilling machine is taken out from the rock mass, the drilling machine is placed on a plane, two threaded rods 2 with extremely high strength in the holes of the middle solid part of the drilling machine are drawn out, and the rock mass with required stress fidelity is taken out by disassembling each part of the drilling machine.

Claims (8)

1. The utility model provides a rock mass drilling sample stress fidelity device under high ground stress which characterized in that: the rock mass cutting device comprises a drill bit (1), wherein sawteeth (11) for cutting a rock mass are arranged at the top of the drill bit (1); the drill bit (1) is installed at the head of the drilling machine, a threaded rod (2) penetrates through the drilling machine, a high-strength blade (3) for cutting a rock body is arranged in the drilling machine, and a rotating rod (4) penetrating through the high-strength blade (3) is installed in the drilling machine; the drilling machine is characterized in that a steel rod (5) is installed in the drilling machine and penetrates through a drill bit (1), a first spring (6) is installed at the other end of the steel rod (5), the other end of the first spring (6) is connected with a sphere (7), the other end of the sphere (7) is in contact fit with a protruding part of a sawtooth groove (8), second springs (9) are evenly arranged at two ends of the sawtooth groove (8) respectively, and the other end of the second spring (9) is in contact fit with a fixed baffle (10).
2. The device for sampling the rock mass drilling stress under the high ground stress according to claim 1, which is characterized in that: the drill bit (1) is formed by combining an assembling structure and can be disassembled; the drill bit (1) has a certain thickness.
3. The device for sampling the rock mass drilling stress under the high ground stress according to claim 1, which is characterized in that: the side wall of the drill bit (1) is provided with a threaded hole, the threaded hole and the threaded rod (2) form threaded connection, and the drill bit (1) is detachably fixed on a drilling machine head.
4. The device for sampling the rock mass drilling stress under the high ground stress according to claim 1, which is characterized in that: the high-strength blade (3) used for cutting rock bodies in the drilling machine is rectangular, the length of the high-strength blade is equal to half of the inner diameter of the drilling machine, and the width of the high-strength blade is smaller than the ring width of the drilling machine.
5. The device for sampling the rock mass drilling stress under the high ground stress according to claim 1, which is characterized in that: the diameter of the top end of the steel rod (5) is larger than that of the middle part.
6. The device for sampling the rock mass drilling stress under the high ground stress according to claim 1, which is characterized in that: protruding parts at two ends of the sawtooth groove (8) are equidistant, and the inner diameter of the initial protruding part is smaller than the diameter of the sphere (7).
7. The device for sampling the rock mass drilling stress under the high ground stress according to claim 1, which is characterized in that: the second spring (9) adopts various different strengths and generates pressure on the steel rod (5).
8. The use method of the rock mass drilling sampling stress fidelity device under high ground stress as claimed in any one of the claims 1-7 is characterized in that the method comprises the following steps:
step 1: selecting a relatively flat face on a mountain, wherein the selected area is larger than the area of a rock body to be taken out, and cutting the weathered rock on the surface layer of the selected area by using a cutting machine to expose the rock inside;
step 2: the drilling machine is used for drilling holes at the deep part of the rock mass, and the steel rod (5) penetrating through the drill bit of the drilling machine props against the rock mass drilled by the drill bit of the drilling machine while drilling the holes, so that the phenomenon of rock core caking caused by differential unloading and rebounding in the drilling process is prevented;
step 3: the first spring (6) connected with the ball body (7) props against the steel rod (5) at the tail end of the drilling machine, the ball body (7) and the convex parts of the sawtooth groove (8) interact, the second springs (9) on two sides of the sawtooth groove (8) can be compressed along with the increase of force in the drilling process, the distance between the convex parts is increased, when the force is larger than a threshold value, the distance between the convex parts is just larger than the diameter of the ball body (7), and the ball body can slide into the position between the next convex parts of the sawtooth groove (8) and sequentially move downwards until the drilling machine drills the whole rock sample;
step 4: stopping drilling after drilling is finished, and driving the blade (3) to cut the rock mass through a rotating rod (4) with the side wall of the rotary drilling machine connected with the blade;
step 5: the drilling machine is taken out from the rock mass, the drilling machine is placed on a plane, two threaded rods (2) with extremely high strength in the holes of the middle solid part of the drilling machine are drawn out, and the rock mass with required stress fidelity is taken out by disassembling each part of the drilling machine.
CN201910369133.9A 2019-05-05 2019-05-05 Rock mass drilling sampling stress fidelity device and method under high ground stress Active CN110043210B (en)

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CN110454105A (en) * 2019-08-27 2019-11-15 中煤科工集团重庆研究院有限公司 Coal mine underground coal bed gas bearing capacity with boring in-situ test system and method
CN112324374B (en) * 2021-01-04 2021-04-20 成都理工大学 Stress-preserving coring device and method

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AT337638B (en) * 1974-07-29 1977-07-11 Edenvale Eng Works Rock drilling machine
GB2117428A (en) * 1982-02-11 1983-10-12 Ennis M S J Improvements in or relating to rotary percussion core hammers
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