Top-cutting pressure relief device of hole rope structure and using method of top-cutting pressure relief device

Abstract

The invention discloses a roof cutting pressure relief device of a hole rope structure and a using method, and belongs to the technical field of coal mining. The using method comprises the following steps that a rope saw sequentially penetrates through a first arc-shaped drill hole and a second arc-shaped drill hole under traction of a rope saw machine in the extending direction of a roadway so as to continuously cut a multi-layer roof, the first rope saw cutting seams and the second rope saw cutting seams are arranged in a linear array in the extending direction of the roadway in a staggered mode, and continuous cutting seams in the extending direction of the roadway are macroscopically formed through the first rope saw cutting seams and the second rope saw cutting seams which are arranged in a staggered mode. According to the method, by converting discrete kerfs into equivalent continuous kerfs, macroscopic continuous fracture of the roof in the roadway direction is achieved, the roof collapse energy release uniformity and roof fracture controllability are effectively improved, the suspended length of the suspended roof can be effectively reduced, the limitation of a free surface in the cumulative blasting process is solved, and the construction efficiency is improved. And the method can be widely applied.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mine mining, and particularly relates to a roof cutting and pressure relief device with a hole-rope structure and a using method thereof. Background Art

[0002] When underground coal mines are mined, there is a phenomenon of suspended roof when the roof has not reached the ultimate caving length. Especially during the process of gob-side entry retaining, the roof in the gob area cannot be effectively fractured and caved in time, resulting in a large area of suspended roof. The un-caved roof in time affects the stability of the gob-side roadway, and the uncertain fracture and caving of the suspended roof generate a huge hurricane at the moment of fracture, posing a great threat to the safety of production personnel in this area.

[0003] At present, in the coal mine field, for large-area roof suspension, in the initial mining face, in order to avoid too long initial weighting distance, methods such as loose blasting and hydraulic fracturing are generally used. During the process of gob-side entry retaining, in order to avoid too long roof exposure length in the retained roadway area, a roof cutting method is generally used. The roof cutting method generally uses continuous borehole cumulative blasting or a chain arm saw to cut the roof. Due to factors such as the uncertainty of the hydraulic fracturing range, the limitation of the free surface of cumulative blasting, and the limited cutting depth of the chain arm saw, many roof cutting methods cannot be widely applied. Summary of the Invention

[0004] The purpose of the present invention is to provide a roof cutting and pressure relief device with a hole-rope structure and a using method thereof, which are used to solve the technical problem that many roof cutting methods cannot be widely applied due to factors such as the uncertainty of the hydraulic fracturing range, the limitation of the free surface of cumulative blasting, and the limited cutting depth of the chain arm saw in the prior art.

[0005] In order to achieve the above purpose, the present invention provides the following technical solution: A using method of a roof cutting and pressure relief device with a hole-rope structure, including the following steps:

[0006] S1: Calculate the bending angle of the curve section, the bending strength of the curve section, the length of the curve section corresponding to the roof cutting half-span S, and the apex angle of the arc-shaped drilling trajectory according to the required roof cutting depth H and roof cutting half-span S; The bending angle of the curve section The bending strength of the curve section The length of the curve section corresponding to the roof cutting half-span S and the apex angle of the arc-shaped drilling trajectory;

[0007] S2: Input the calculated relevant parameter data into the directional drilling tool, and the directional drilling tool receives the data and generates a preset drilling trajectory for one span;

[0008] S3: Select the required initial drilling position D on the multi-layer roof where the roadway is located, and drive the directional drilling tool to alternately drill along the extension direction of the roadway according to the preset drilling trajectory to obtain a plurality of first arc-shaped drill holes and second arc-shaped drill holes whose center lines are continuously Z-shaped and staggered in three-dimensional space;

[0009] S4: allowing the wire saw to pass through the drill hole and form a closed loop path with the traction drive mechanism on the wire saw machine to cut the multi-layer top plate and generate a vertical fan-shaped cutting surface;

[0010] S5: the wire saw, under the traction of the wire saw machine, sequentially passes through the first arc-shaped drill hole and the second arc-shaped drill hole along the extension direction of the tunnel to continuously cut the multi-layer roof, thereby obtaining the first wire saw cutting slit and the second wire saw cutting slit which are arranged in a linear array and staggered along the extension direction of the tunnel, and a continuous cutting slit is formed macroscopically along the extension direction of the tunnel through the first wire saw cutting slit and the second wire saw cutting slit arranged in a staggered manner;

[0011] S6: Along the excavation direction of the coal mine, repeat the above steps at preset intervals to cut the multi-layer roof.

[0012] Preferably, the first rope saw cut and the second rope saw cut in S5 include a horizontal offset and a vertical layered spacing.

[0013] Preferably, the length Ds of the horizontal offset is in the range of S <Ds<S,所述垂直分层间距的长度Dd为H / n。

[0014] Preferably, the staggered design of the first rope saw slit and the second rope saw slit in S5 allows the stress shadow areas of adjacent slits to overlap, inducing cracks to expand along the slit lines, forming a macro-continuous weak surface and a weakened zone in the multi-layer top plate.

[0015] Preferably, the width of the weakened zone is equal to the length of the vertical layer spacing.

[0016] Preferably, the calculation formula in S1 is: Bending Angle Curve segment bending strength The curve segment corresponding to the half span S of the top cut length The top angle of the arc drilling trajectory is θ0 = 90°-ν(°).

[0017] A top cutting pressure relief device of a hole rope structure comprises a directional drilling tool, a rope saw and a rope saw machine. The rope saw machine comprises a double driving wheel traction mechanism and a walking mechanism. The double driving wheel traction mechanism is transmission-connected with the rope saw to form a closed-loop cutting path.

[0018] Preferably, the walking mechanism comprises two symmetrically arranged driving trolleys, and a hydraulic tensioning wheel is arranged on the top of the driving trolley.

[0019] Preferably, the dual-drive wheel traction mechanism includes two driving wheels, which are respectively arranged on two driving trolleys, and the driving wheels are driven to rotate by a motor.

[0020] Preferably, the directional drilling tool is a gyroscopic guided drill, the rope saw is launched by a pneumatic launcher, and the rope saw is a diamond rope saw.

[0021] In the above technical solution, a roof cutting and pressure relief device with a hole-rope structure and its using method provided by the present invention have the following beneficial effects:

[0022] 1. Through the misalignment design of adjacent first rope saw cuts and second rope saw cuts, the stress shadow areas of adjacent cuts overlap. Through the cumulative effect of the overlap amount and misalignment, local cutting is transformed into macroscopic structure weakening, so that discrete cuts are transformed into equivalent continuous cutting slits, realizing macroscopic continuous fracture of the roof along the roadway direction, transforming discrete cuts into equivalent continuous weak surfaces, inducing cracks to expand along the connection line of the cuts, effectively improving the uniformity of roof collapse energy release and the controllability of roof fracture. Through continuous cutting, the roof can be completely cut off, effectively reducing the exposed length of the suspended roof, solving the limitation of the free surface in the process of shaped charge blasting, and enabling the method to be widely applied.

[0023] 2. By using a directional drilling tool to alternately drill holes along the extension direction of the roadway, a plurality of first arc-shaped holes and second arc-shaped holes with the connection line of the central axes being continuously Z-shaped staggered in three-dimensional space are obtained. The first arc-shaped holes and the second arc-shaped holes belong to two parallel planes and form a Z-shaped cutting path, expanding the coverage of a single operation, reducing the risk of roof collapse, breaking through the traditional parallel drilling layout, forming a three-dimensional cutting network, improving the uniformity of roof weakening and the controllability of roof fracture. Compared with the blasting method and the splitting method, by using directional arc-shaped holes, large-diameter holes are not required, thus reducing the project quantity and effectively improving the cutting efficiency.

[0024] 3. By arranging the rope saw, after the drilling construction is completed, the rope saw passes through a single hole and forms a closed-loop path with the traction drive mechanism on the rope saw machine. The traction drive mechanism drives the rope saw to cut the multi-layer roof below the hole and form a fan-shaped cutting surface. The purpose of cutting the roof is achieved through the traction drive of the rope saw machine. The movement of the rope saw machine can change the contact effect between the rope saw and the roof rock formation, keeping the rope saw in good contact with the lower roof during the cutting process. At the same time, by cutting with the rope saw, the cutting depth can be adjusted according to the depth and span of the roof to be cut, solving the limitation of the cutting depth of the chain arm saw when cutting the roof. Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0026] Figure 1 is the front view of the overall structure of the present invention;

[0027] Figure 2 is the left view of the overall structure of the present invention;

[0028] Figure 3 is the top view of the overall structure of the present invention;

[0029] Figure 4 is the schematic diagram of the first arc-shaped drilling of the wire saw cutting of the present invention;

[0030] Figure 5 is the schematic diagram of the wire saw further cutting the first arc-shaped drilling of the present invention;

[0031] Figure 6 is the schematic diagram of the wire saw passing through the second arc-shaped drilling of the present invention;

[0032] Figure 7 is the schematic diagram of the wire saw cutting the second arc-shaped drilling of the present invention;

[0033] Figure 8 is the schematic diagram of the wire saw further cutting the second arc-shaped drilling of the present invention;

[0034] Figure 9 is the schematic diagram of the wire saw performing alternating continuous cutting along the extending direction of the roadway of the present invention;

[0035] Figure 10 is the schematic diagram after the wire saw cutting of the present invention is completed;

[0036] Figure 11 is the schematic diagram of the effect after the application of the present invention;

[0037] Figure 12 is the enlarged schematic diagram of area M

[0038] Figure 13 is the schematic diagram of the theoretical calculation of the arc-shaped drilling trajectory in the present invention.

[0039] Explanation of reference numerals:

[0040] 1. First arc-shaped drilling; 2. Second arc-shaped drilling; 3. Wire saw; 4. Wire saw machine; 5. First roof; 6. Coal and rock stratum where the roadway is located; 7. Second roof; 8. Third roof; 9. Roadway; 10. Roof cutting area; 11. First wire saw cutting seam; 12. Second wire saw cutting seam. Detailed implementation manners

[0041] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further introduced in detail below with reference to the accompanying drawings.

[0042] As Figures 1-13As shown in the figure, a roof cutting and pressure relief device with a hole-rope structure and its usage method include the following steps:

[0043] S1: Calculate the curve segment based on the required roof cutting depth H and roof cutting semi-span S, bending angle, curve segment bending strength, curve segment corresponding to the roof cutting semi-span S length, and the apex angle of the arc-shaped drilling trajectory;

[0044] Specifically, the calculation formula in S1 is: curve segment bending angle curve segment bending strength curve segment corresponding to the roof cutting semi-span S length apex angle θ0 of the arc-shaped drilling trajectory = 90° - ν (°). Due to the geological characteristics, the geological cross-section generally shows a layered arrangement. As Figure 4 shown in the figure, the roof at the top of the roadway 9 presents a multi-layer roof structure where the first roof 5 covers the coal and rock layer 6 where the roadway is located, the second roof 7 covers the first roof 5, and the third roof 8 covers the second roof 7. During coal mining in the coal and rock layer 6 where the roadway is located, there is a phenomenon of suspended roof when the roof does not reach the ultimate caving length. Especially during the process of gob-side entry retaining, the gob-side roof cannot break effectively and collapse in time, resulting in a large area of suspended roof. The uncollapsed roof in time affects the stability of the gob-side roadway, and the uncertain fracture and collapse of the suspended roof generate a huge hurricane instantaneously, posing a great threat to the safety of production personnel in this area. Therefore, during the process of gob-side entry retaining, in order to avoid the excessive length of the roof exposure at the top of the retained roadway area, the method of roof cutting is generally adopted to shorten the suspended roof length to ensure the stability of the gob-side roadway.

[0045] Furthermore, when cutting the multi-layer roof, first use a ground-penetrating radar to scan the multi-layer roof at the corresponding position at the top of the roadway 9 to determine the required roof cutting depth H and roof cutting semi-span S of the multi-layer roof at the corresponding position at the top of this roadway 9.

[0046] Furthermore, according to the determined roof cutting depth H and roof cutting semi-span S, and substitute the determined data into the following mechanical model formula: curve segment bending angle curve segment bending strength curve segment corresponding to the roof cutting semi-span S length apex angle θ0 of the arc-shaped drilling trajectory = 90° - ν (°). Dynamically calculate the curvature parameters through the above formula, so as to design an arc-shaped drilling path with a certain curvature to achieve the precise matching of the drilling path with the stress field of the multi-layer roof and improve the structural stability.

[0047] S2: Input the calculated relevant parameter data into the directional drilling tool. The directional drilling tool receives the data and generates a preset drilling trajectory for one span.

[0048] Specifically, input the curvature parameter of the arc-shaped drilling path calculated by the above formula into the directional drilling tool. The directional drilling tool receives the data and generates a preset drilling trajectory for one span. Design an arc-shaped path by imitating the natural fracture surface of the rock formation through a bionic drilling track, so as to achieve the purpose of reducing energy loss. The relevant parameters of the angle and radian of the arc-shaped drilling can be calculated through the depth and span to be cut off the top to meet the cutting-off depth and range, solving the uncertainty of the cutting-off depth caused by the lack of a free surface during the process of cutting off the top by cumulative energy blasting.

[0049] S3: Select the required initial drilling position D on the multi-layer roof where the roadway 9 is located. Drive the directional drilling tool to drill alternately along the extension direction of the roadway 9 according to the preset drilling trajectory, and obtain a plurality of first arc-shaped drill holes 1 and second arc-shaped drill holes 2 whose connection lines of the central axes in the three-dimensional space are continuously Z-shaped and staggered.

[0050] Specifically, after inputting the relevant parameters into the directional drilling tool and obtaining a preset drilling trajectory for one span, start the drilling construction. First, select the required initial drilling position D on the multi-layer roof where the roadway 9 is located. Drive the directional drilling tool to pass through the initial position D and drill along the extension direction of the roadway 9 according to a preset drilling trajectory for one span to obtain the first first arc-shaped drill hole 1.

[0051] Further, at a preset distance from the first first arc-shaped drill hole 1 in the coal mine excavation direction, as Figure 2 shown, and make the second drilling vertex and the starting point D of the first arc-shaped drill hole 1 be separated by a preset distance along the extension direction of the roadway 9 to determine the starting vertex of the second drill hole, as Figure 1 shown. Then drive the directional drilling tool to pass through the starting vertex of the second drill hole and drill along the extension direction of the roadway 9 according to a preset drilling trajectory for one span to obtain the first second arc-shaped drill hole 2.

[0052] Further, by analogy, make the directional drilling tool drill alternately along the extension direction of the roadway 9, so as to obtain a plurality of first arc-shaped drill holes 1 and second arc-shaped drill holes 2 whose connection lines of the central axes in the three-dimensional space are continuously Z-shaped and staggered, as Figure 3 shown. The first arc-shaped drill hole 1 and the second arc-shaped drill hole 2 belong to two parallel planes, form a Z-shaped cutting path, and form a continuous roof cutting area 10, thereby expanding the coverage range of a single operation, reducing the risk of roof collapse, breaking through the traditional parallel drilling layout, forming a three-dimensional cutting network, improving the uniformity of roof weakening, and improving the controllability of roof fracture. Compared with the blasting method and the splitting method, the directional arc-shaped drilling can achieve the purpose of reducing the engineering quantity without large-diameter drilling, and effectively improve the cutting efficiency.

[0053] S4: Thread the wire saw 3 through the drill hole and form a closed-loop path with the traction drive mechanism on the wire saw machine 4 to cut the multi-layer roof and generate a vertical fan-shaped cutting surface;

[0054] Specifically, after the drilling construction is completed, thread the wire saw 3 through a single drill hole and form a closed-loop path with the traction drive mechanism on the wire saw machine 4. Drive the wire saw 3 to cut the multi-layer roof below the drill hole through the traction drive mechanism, and form a fan-shaped cutting surface. The purpose of cutting the roof is achieved through the traction drive of the wire saw machine 4. The movement of the wire saw machine 4 can change the contact effect between the wire saw 3 and the roof rock formation, and keep the wire saw 3 in good contact with the lower roof during the cutting process. At the same time, by cutting with the wire saw 3, the cutting depth can be adjusted according to the depth and span of the roof to be cut, solving the limitation of the cutting depth of the chain arm saw during roof cutting.

[0055] S5: Under the traction of the wire saw machine 4, the wire saw 3 sequentially passes through the first arc-shaped drill hole 1 and the second arc-shaped drill hole 2 along the extension direction of the roadway 9 to continuously cut the multi-layer roof, obtaining the first wire saw cut 11 and the second wire saw cut 12 that are linearly arranged and offset along the extension direction of the roadway 9, and forming a continuous cutting gap along the extension direction of the roadway 9 macroscopically through the offset first wire saw cut 11 and the second wire saw cut 12;

[0056] Specifically, under the traction of the wire saw machine 4, the wire saw 3 first passes through the first first arc-shaped drill hole 1 and cuts the roof below the drill hole. After the cutting is completed, then thread the wire saw 3 into the first second arc-shaped drill hole 2 and form a closed-loop path with the traction drive mechanism on the wire saw machine 4 to cut the roof below the first second arc-shaped drill hole 2. Under the traction of the wire saw machine 4, drive the wire saw 3 to sequentially and alternately pass through the first arc-shaped drill hole 1 and the second arc-shaped drill hole 2 along the extension direction of the roadway 9 and perform alternating continuous cutting on the roof below the corresponding drill holes, as Figures 4 to 10 shown, thereby forming the first wire saw cut 11 and the second wire saw cut 12 that are linearly arranged and offset. Through continuous cutting, the roof can be completely cut off, effectively reducing the exposed length of the suspended roof and solving the limitation of the free surface during the process of shaped charge blasting.

[0057] Furthermore, through the offset design of adjacent first wire saw cuts 11 and second wire saw cuts 12, the stress shadow areas of adjacent cuts overlap. Through the cumulative effect of the overlap amount and the offset, the local cutting is transformed into macroscopic structural weakening, thereby transforming the discrete cuts into equivalent continuous cutting gaps, realizing the macroscopic continuous fracture of the roof along the direction of the roadway 9, transforming the discrete cuts into equivalent continuous weak surfaces, inducing the cracks to expand along the connection line of the cuts, and effectively improving the uniformity of the roof collapse energy release and the controllability of the roof fracture.

[0058] S6: Along the excavation direction of the coal mine, repeat the above steps at preset intervals to cut the multi-layer roof.

[0059] As a further embodiment of the present invention, the first wire saw cut 11 and the second wire saw cut 12 in S5 include a horizontal offset and a vertical layer spacing.

[0060] As a further embodiment of the present invention, the length Ds of the horizontal offset is in the range of S <Ds<2S,垂直分层间距的长度Dd为H / n。

[0061] Specifically, n is the number of roof layers. By limiting the quantitative relationship between the offset and the cutting depth, the traditional empirical value method is broken through to achieve adaptive matching between the roof weakening effect and the mining scale.

[0062] As a further embodiment of the present invention, the staggered design of the first rope saw slit 11 and the second rope saw slit 12 in S5 allows the stress shadow areas of adjacent slits to overlap, inducing cracks to expand along the slit lines, forming a macro-continuous weak surface, and forming a weakened zone in the multi-layer top plate.

[0063] Specifically, by limiting the borehole axes to be staggered in a continuous Z shape and coupling the staggered design, the first rope saw cut slit 11 and the second rope saw cut slit 12 form a weakened zone in the roof, covering the main stress concentration area of ​​the roof.

[0064] As a further embodiment of the present invention, the width of the weakened zone is the length of the vertical layer spacing.

[0065] A top cutting pressure relief device of a hole rope structure includes a directional drilling tool, a rope saw 3, and a rope saw machine 4. The rope saw machine 4 includes a double drive wheel traction mechanism and a walking mechanism. The double drive wheel traction mechanism is transmission-connected with the rope saw 3 to form a closed-loop cutting path.

[0066] Specifically, the wire saw 3 is passed through a single drill hole and forms a closed-loop path with the double-drive wheel traction mechanism on the wire saw machine 4. The double-drive wheel traction mechanism drives the wire saw 3 to cut the multi-layer top plate below the drill hole and form a fan-shaped cutting surface. The traction transmission of the wire saw machine 4 is used to achieve the purpose of cutting the top plate. The wire saw machine 4 is towed by the walking mechanism, and the wire saw 3 is used for cutting. The cutting depth can be adjusted according to the depth and span of the top cut, which solves the problem of the limited cutting depth of the chain arm saw when cutting the top.

[0067] As a further embodiment of the present invention, the walking mechanism includes two symmetrically arranged driving trolleys, and a hydraulic tensioning wheel is arranged on the top of the driving trolley.

[0068] Specifically, during the cutting process of the wire saw 3, through the opposite movement of the two driving trolleys, and during the movement, the hydraulic tensioning wheel and the gradually decreasing cutting roof plate always maintain a tensioned state, and the contact effect between the wire saw 3 and the roof rock stratum is changed, so that the wire saw 3 always maintains good contact with the lower roof during the cutting process.

[0069] As a further embodiment provided by the present invention, the double-drive wheel traction mechanism includes two driving wheels, which are respectively arranged on the two driving trolleys, and the driving wheels are driven to rotate by motors.

[0070] Specifically, compared with single-wheel drive, cutting by double-drive wheels is not prone to slipping.

[0071] As a further embodiment provided by the present invention, the directional drilling tool is a gyroscopic orientation drill, the wire saw 3 is threaded by an air launcher to launch a guiding rope, and the wire saw 3 is a diamond wire saw.

[0072] Only some exemplary embodiments of the present invention have been described by way of illustration above. Undoubtedly, for those of ordinary skill in the art, without departing from the spirit and scope of the present invention, the described embodiments can be modified in various different ways. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A method for using a top cutting pressure relief device of a hole rope structure, characterized in that: It includes the following steps: S1: The curve segment is calculated based on the required top cutting depth H and top cutting half span S. Bending angle, curved segment Curve segment corresponding to bending strength and half span S of top cutting length and top angle of the arc drilling trajectory; S2: Input the calculated relevant parameter data into the directional drilling tool, and the directional drilling tool receives the data and generates a preset drilling trajectory for one span; S3: Select the required initial drilling position D on the multi-layer roof where the roadway (9) is located, and drive the directional drilling tool to drill alternately along the extension direction of the roadway (9) according to the preset drilling trajectory, obtaining a plurality of first arc-shaped drill holes (1) and second arc-shaped drill holes (2) whose connecting lines of the central axes in the three-dimensional space are continuously Z-shaped and staggered; S4: Pass the wire saw (3) through the drill holes and form a closed-loop path with the traction drive mechanism on the wire saw machine (4) to cut the multi-layer roof and generate a vertical fan-shaped cutting surface; S5: The wire saw (3) is successively pulled by the wire saw machine (4) through the first arc-shaped drill hole (1) and the second arc-shaped drill hole (2) along the extension direction of the roadway (9) to continuously cut the multi-layer roof, obtaining first wire saw cut seams (11) and second wire saw cut seams (12) that are linearly arrayed along the extension direction of the roadway (9) and are offset, and forming a continuous cutting gap along the extension direction of the roadway (9) macroscopically through the offset first wire saw cut seams (11) and second wire saw cut seams (12); S6: Along the excavation direction of the coal mine, repeat the above steps at preset intervals to cut the multi-layer roof.

2. The method for using the top cutting pressure relief device of the hole rope structure according to claim 1 is characterized in that: The first wire saw cut seam (11) and the second wire saw cut seam (12) in S5 include a horizontal offset and a vertical layer spacing.

3. The method for using the top cutting pressure relief device of the hole rope structure according to claim 2 is characterized in that: The length Ds of the horizontal offset ranges from S < Ds < 2S, and the length Dd of the vertical layer spacing is H / n.

4. The method for using the top cutting pressure relief device of the hole rope structure according to claim 3 is characterized in that: The offset design of the first wire saw cut seam (11) and the second wire saw cut seam (12) in S5 overlaps the stress shadow areas of adjacent cut seams, induces the cracks to expand along the connection line of the cut seams, forms a macroscopic continuous weak surface, and forms a weakening zone in the multi-layer roof.

5. The method for using the top cutting pressure relief device of the hole rope structure according to claim 4 is characterized in that: The width of the weakening zone is the length of the vertical layer spacing.

6. A method for using a top cutting pressure relief device of a hole rope structure, characterized in that: The calculation formula in S1 is: Bending Angle Curve segment bending strength The curve segment corresponding to the half span S of the top cut length The top angle of the arc drilling trajectory is θ0 = 90°-ν(°).

7. A top cutting pressure relief device of a hole rope structure according to any one of claims 1 to 6, characterized in that: It includes a directional drilling tool, a wire saw (3), and a wire saw machine (4). The wire saw machine (4) includes a double-drive wheel traction mechanism and a traveling mechanism. The double-drive wheel traction mechanism is传动连接 with the wire saw (3) and forms a closed-loop cutting path.

8. A top cutting pressure relief device of a hole rope structure according to claim 7, characterized in that: The traveling mechanism includes two symmetrically arranged drive trolleys, and a hydraulic tensioning wheel is arranged on the top of the drive trolley.

9. A top cutting pressure relief device of a hole rope structure according to claim 8, characterized in that: The double-drive wheel traction mechanism includes two driving wheels, which are respectively arranged on the two drive trolleys, and the driving wheels are driven to rotate by motors.

10. A top cutting pressure relief device of a hole rope structure according to claim 9, characterized in that: The directional drilling tool is a gyroscopic orientation drill, the wire saw (3) is passed through by using a pneumatic launcher to launch a guide rope, and the wire saw (3) is a diamond wire saw.

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