Determination method for anchor rod or anchor cable partition support of super-large working face retracement channel

Abstract

The invention discloses a method for determining anchor rod or anchor cable partition support of an ultra-large working face retracement channel, which comprises the following steps of: drawing a bending moment curve of a main retracement channel based on the structure of the main retracement channel; combining the bending moment curve to divide the main retracement channel into three support areas A, B and C; parameters of roof anchor rods in the A, B and C support areas are obtained; parameters of roof anchor cables in the A, B and C support areas are obtained; parameters of non-mining-side anchor rods of the top plates in the A, B and C supporting areas are obtained, and parameters of mining-side anchor rods of the top plates in the A, B and C supporting areas are obtained. According to the determining method, it can be guaranteed that the working face support is withdrawn in a safe state in coal mine production, the production cost of a coal mine can be reduced, the production efficiency is improved, and theoretical reference is provided for supporting design and supporting research of a coal mine main withdrawing roadway in the future.

Description

Technical Field

[0001] The present invention relates to the technical field of mine mining, and in particular to a method for determining zoning support of anchor rods or anchor cables in a withdrawal channel of an ultra-large working face. Background Art

[0002] With the continuous advancement of coal mining technology, the widespread application of high-height fully mechanized mining processes, and the increasing degree of mechanization, the cross-section of working face tunnels has gradually increased, significantly increasing the difficulty of surrounding rock control and support. Traditional retreat tunnel support methods are no longer able to meet the safety requirements of mining under ultra-large working face conditions. Under the dual influence of tunneling and mining, the mechanical properties of the surrounding rock in the retreat tunnel may change significantly. Therefore, support design must comprehensively consider the coal seam roof structure and its movement patterns to ensure safety and economic efficiency.

[0003] At present, the support design of the withdrawal tunnel mainly relies on the anchor rod and cable support technology. The relevant theories include suspension theory, composite beam theory, maximum horizontal stress theory and extrusion reinforcement theory. However, these theories do not fully consider the differences in the bending moment distribution of the main withdrawal channel roof in different areas. In actual engineering, the roof of the main withdrawal channel can be simplified to a simply supported beam model supported by high-rigidity tunnel walls at both ends, bearing the uniformly distributed load generated by the breaking of the upper moving rock layer. Since the bending moment of the simply supported beam structure is low at both ends and high in the middle, the traditional uniform support method may lead to insufficient support strength or excessive support, which in turn affects safety and production efficiency. In addition, poor support design may cause the support to be crushed and increase the risk of moving operations, while overly conservative support will reduce construction efficiency. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for determining the zoning support of anchor rods or anchor cables in the withdrawal channel of an ultra-large working face. This method can not only ensure the efficient withdrawal of the working face support under safe conditions, but also effectively reduce the production cost of the coal mine and significantly improve production efficiency.

[0005] To achieve the above objectives, the technical solution of the present application is: a method for determining the zoning support of anchor rods or anchor cables in a pullback channel of an ultra-large working face, comprising:

[0006] Based on the structure of the main retracement channel, draw the bending moment curve of the main retracement channel;

[0007] Combined with the bending moment curve, the main retreat channel is divided into three support areas: A, B, and C;

[0008] Obtain the parameters of the top plate anchor rods in support areas A, B, and C;

[0009] Obtain the parameters of the top plate anchor cables in support areas A, B, and C;

[0010] Obtain the parameters of the non-mining side anchor bolts of the roof in the A, B, and C support areas.

[0011] Obtain the parameters of the side anchors for roof mining in support areas A, B, and C.

[0012] As a preferred solution of the present invention, the parameters of the roof anchor rod include the length of the roof anchor rod, the diameter of the roof anchor rod and the spacing between the roof anchor rods.

[0013] As a preferred solution of the present invention, the parameters of the top plate anchor cables include the length of the top plate anchor cables and the spacing between the top plate anchor cables.

[0014] As a preferred solution of the present invention, the parameters of the anchor rods on the non-mining side of the roof include the length of the anchor rods on the non-mining side of the roof, the diameter of the anchor rods on the non-mining side of the roof, and the spacing between the anchor rods on the non-mining side of the roof.

[0015] As a preferred solution of the present invention, the parameters of the roof mining side anchor rods include the roof mining side anchor rod length, roof mining side anchor rod diameter and the spacing between roof mining side anchor rods.

[0016] As a preferred solution of the present invention, the depth Lp of the top plate crushing zone of the main retreat channel is obtained as follows:

[0017]

[0018] Among them, σ t is the tensile strength of the coal seam, in MPa; K1 is the safety factor; K2 is the surface strengthening coefficient after adding the mesh; B is the tunnel width, in m; q is the approximately uniformly distributed load above the composite beam.

[0019] As a preferred solution of the present invention, the parameters of the roof anchor are obtained as follows:

[0020] The length L of the top plate anchor rod in the A, B, and C support areas is:

[0021] L=L p +L1+L2

[0022] Wherein, L1 is the exposed length of the top plate anchor rods in the support areas A, B, and C, in meters; L2 is the anchored length of the top plate anchor rods in the support areas A, B, and C, in meters;

[0023] The diameter D of the top plate anchor rod in the A, B, and C support areas is:

[0024]

[0025] Wherein, T is the pull-out force of the top plate anchor rod in the support areas A, B, and C, in KN; [σ] is the allowable strength of the top plate rod material in the support areas A, B, and C, in MPa;

[0026] The spacing a between the top plate anchor bolts in the A, B, and C support areas is:

[0027]

[0028] Where a is the spacing between the top plate anchor rods in the A, B, and C support areas, in m; Q is the design anchoring force of the top plate anchor rods in the A, B, and C support areas, in kN; γ is the average gravity density of the unstable rock formation in the A, B, and C support areas, in kN; L p It is the depth of the top plate crushing zone of the main retracement channel, in meters; k is the safety factor.

[0029] As a preferred solution of the present invention, the parameters of the top plate anchor cable are obtained as follows:

[0030] The length of the top plate anchor cable Ld in the A, B, and C support areas is:

[0031] X=X1+X2+X3

[0032] Among them, X1 is the exposed length of the top plate anchor cable in the support areas A, B, and C, in meters; X2 is the anchored length of the top plate anchor cable in the support areas A, B, and C, in meters; X3 is the height of the potentially unstable rock formation in the support areas A, B, and C, in meters;

[0033] The spacing between the top plate anchor cables in the A, B, and C support areas is:

[0034]

[0035] Where σ is the breaking load of the roof anchor cable in the A, B, and C support areas, in kN; γ is the coal rock volume force, in KN / m 3 ; B is the tunnel width, unit is m; K is the safety factor.

[0036] As a preferred solution of the present invention, the parameters of the anchor bolts on the non-mining side of the roof are obtained as follows:

[0037] The length of the anchor bolt L on the non-mining side of the support areas A, B, and C is:

[0038] L=L p +L1+L2

[0039] Wherein, L1 is the exposed length of the anchor bolt on the non-mining side of the support area A, B, and C, in meters; L2 is the anchor length of the anchor bolt on the non-mining side of the support area A, B, and C, in meters;

[0040] The diameter D of the anchor bolt on the non-mining side of the support areas A, B, and C is:

[0041]

[0042] Wherein, T is the anchor pull-out force in the support areas A, B, and C, in KN; [σ] is the allowable strength of the anchor material on the non-mining side of the support areas A, B, and C, in MPa;

[0043] The spacing a between anchor bolts on the non-mining side of the A, B, and C support areas is:

[0044]

[0045] Where a is the spacing between anchor bolts on the non-mining side of the support areas A, B, and C, in m; Q is the designed anchoring force of anchor bolts on the non-mining side of the support areas A, B, and C, in kN; γ is the average gravity density of unstable rock formations in the support areas A, B, and C, in kN; L p It is the depth of the top plate crushing zone of the main retracement channel, in meters; K is the safety factor.

[0046] As a preferred solution of the present invention, the parameters of the roof mining side anchor are obtained in the following manner:

[0047] The length of the roof anchor bolts on the mining side of the A, B, and C support areas is:

[0048] L=L p +L1+L2

[0049] Among them, L1 is the exposed length of the anchor bolt on the mining side of the support areas A, B, and C, in meters; L2 is the anchor length of the anchor bolt on the mining side of the support areas A, B, and C, in meters;

[0050] The diameter D of the roof anchor bolt on the mining side of the A, B, and C support areas is:

[0051]

[0052] Where T is the anchor pull-out force on the mining side of the A, B, and C support areas, in kN; [σ] is the allowable strength of the mining side anchor material, in MPa;

[0053] The spacing a between the anchor bolts on the mining side roof of the A, B, and C support areas is:

[0054]

[0055] Where a is the spacing between the anchor bolts on the mining side of the A, B, and C support areas, in m; Q is the designed anchoring force of the anchor bolts on the mining side of the A, B, and C support areas, in kN; γ is the average gravity density of the unstable rock formation in the A, B, and C support areas, in kN; L p It is the depth of the top plate crushing zone of the main retracement channel, in meters; K is the safety factor.

[0056] By employing the above technical solution, the present invention achieves the following technical effects: By dividing the main withdrawal channel into zones based on the bending moment curve and determining anchor rod and cable parameters using a zoning approach, the present invention effectively accounts for the force differences in different sections of the withdrawal channel and enables precise design of support schemes. This method significantly improves the refinement of tunnel support and has important practical application value for ensuring tunnel stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0058] Figure 1 This is a schematic diagram of working face advancement;

[0059] Figure 2 Bending moment diagram for the main retracement channel;

[0060] Figure 3 This is a schematic diagram of the main withdrawal channel division of the 108 working face;

[0061] Figure 4 Design drawing for the main retreat channel support.

[0062] Explanation of the serial numbers in the figure: 1. Basic roof; 2. Direct roof; 3. Sectional protection coal pillar; 4. Main withdrawal channel; 5. Remaining coal pillar of the working face; 6. 108 working face; 7. Support; 8. Goaf; 9. Side of the roadway; 10. Roof anchor cable; 11. Roof anchor rod; 12. Non-minable side anchor rod; 13. Minable side anchor rod. DETAILED DESCRIPTION

[0063] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0064] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0065] In the description of this application, it should be understood that the terms "center", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0066] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0067] In the method for determining the anchor rod or anchor cable partition support for the withdrawal channel of the super-large working face in this embodiment, the super-large working face is the Jinjitan Coal Mine 2 -2 Comprehensive mining working face. Figure 1 As shown, it is a schematic diagram of the working face advancement, including the basic roof, below which is the direct roof and goaf, below which are the section protection coal pillar, the main retreat channel, the working face remaining coal pillar, and the 108 working face in the horizontal order, and the 108 working face is provided with a support; Figure 2 As shown, both ends of the main withdrawal channel are tunnel walls, and the main withdrawal channel is respectively provided with roof anchor cables, roof anchor rods, non-minable side anchor rods, and minable side anchor rods.

[0068] The following safety factors are preset parameter values when designing civil engineering, mechanical engineering, etc. to prevent the consequences caused by factors such as material defects, working deviations, and sudden increases in external forces. The force that engineering mechanics can theoretically bear must be greater than the force it actually bears. The safety factor is the ratio of the ultimate stress to the allowable stress.

[0069] like Figure 3 As shown, according to the through-hole data and underground measured data, the coal thickness of the 108 working face is 5.5 to 8.4 m, and the inclination angle is less than 1°. The geological structure is relatively simple and there is no obvious terrain change.

[0070] Direct roof: Gray siltstone with a silty texture, mainly composed of quartz, containing small amounts of mica and black minerals, and a large number of plant root fossils. The thickness of the roof and floor plates ranges from 14.15 to 18.61 meters. The roof is divided into the direct bottom and the old bottom. The direct bottom: Light gray fine sandstone with a fine-grained sandy texture, mainly composed of quartz and feldspar, and containing plant debris fossils. The thickness is 4.04 to 8.95 meters. The old bottom: Gray-black to dark gray mudstone with a slip surface, semi-hard, wavy bedding, and a thickness of 16.71 to 25.9 meters. Geological data from drilling holes near the 108 working face withdrawal channel: The height of the main withdrawal channel is 4.5 meters and the width is 6.6 meters.

[0071] like Figure 4 As shown, this embodiment provides a method for determining anchor rod or anchor cable zoning support for a super-large working face withdrawal channel, including:

[0072] Step 1: Based on the structure of the main retracement channel, draw the bending moment curve of the main retracement channel;

[0073] Step 2: Based on the bending moment curve, the main retreat channel is divided into three support areas: A, B, and C;

[0074] Step 3: Obtain parameters of the roof anchor rods in support areas A, B, and C, wherein the parameters of the roof anchor rods include the length of the roof anchor rods, the diameter of the roof anchor rods, and the spacing between the roof anchor rods;

[0075] Specifically, the depth Lp of the top plate crushing zone of the main retracement channel is:

[0076]

[0077] Among them, σ t is the tensile strength of the coal seam, 2.59 MPa; K1 is the safety factor of the three support areas A, B, and C, 4; K2 is the surface strengthening coefficient after adding the mesh, 2; B is the tunnel width, 6.6 m; q is the approximately uniformly distributed load above the composite beam, the roof q = 0.3914; the depth of the roof crushing zone in the main retreat channel is 1.8 m;

[0078] The lengths L of the top plate anchor rods in the three support areas A, B, and C are:

[0079] L=L p +L1+L2

[0080] Among them, L1 is the exposed length of the top plate anchor rods in the three support areas A, B, and C, which is 0.1m; L2 is the anchored length of the top plate anchor rods in the three support areas A, B, and C, which is 0.5m; the length of the top plate anchor rods in the three support areas A, B, and C is 2.4m;

[0081] The diameters of the top plate anchor rods in the three support areas A, B, and C are:

[0082]

[0083] Wherein, T is the pull-out force of the top plate anchor rod in the three support areas A, B, and C, which is 120 kN; [σ] is the allowable strength of the material of the top plate anchor rod in the three support areas A, B, and C, which is 335 MPa; the diameter of the top plate anchor rod in the three support areas A, B, and C is 24 mm;

[0084] The spacing a between the top plate anchor rods in the three support areas A, B, and C is:

[0085]

[0086] Among them, a is the spacing between the top plate anchor rods of the three support areas A, B, and C, which are equal, m; Q is the design anchoring force of the top plate anchor rods of the three support areas A, B, and C, 110 kN; γ is the average gravity density of the unstable rock formation, 25 kN; the depth of the top plate crushing zone of the main withdrawal channel is 1.3 m; K is the safety factor of the three support areas A, B, and C, 2; the spacing between the top plate anchor rods of the three support areas A, B, and C is 1200×1200 mm;

[0087] Step 4: Obtain the parameters of the top plate anchor cables in the support areas A, B, and C, wherein the parameters of the top plate anchor cables include the length of the top plate anchor cables and the spacing between the top plate anchor cables;

[0088] Specifically, the roof anchor cable length Ld of the three support areas A, B, and C is:

[0089] X=X1+X2+X3

[0090] Among them, X1 is the exposed length of the top plate anchor cable in the three support areas A, B, and C, which is 0.3m; X2 is the height of the potentially unstable rock layer in the three support areas A, B, and C, which is 10m; X3 is the anchor length of the top plate anchor cable in the three support areas A, B, and C, which is 2.5m; the length of the anchor cable brought into the three support areas A, B, and C is 12.8m;

[0091] The spacing between the top plate anchor cables in the three support areas A, B, and C is:

[0092]

[0093] Where, σ is the breaking load of the top plate anchor cables in the three support areas A, B, and C, 504 kN;

[0094] γ is the coal rock body force, 25.8KN / m 3 B is the tunnel width, 6.6m; K is the safety factor of the three support areas A, B, and C, which are 0.4, 0.3, and 0.2 respectively; the anchor cable spacing in area A is 2m, the anchor cable spacing in area B is 1.5m, and the anchor cable spacing in area C is 1m;

[0095] Step 5: Obtain the parameters of the non-mining side anchor rods of the roof in the A, B, and C support areas, wherein the parameters of the non-mining side anchor rods include the length of the non-mining side anchor rods, the diameter of the non-mining side anchor rods, and the spacing between the non-mining side anchor rods;

[0096] Specifically, the depth Lp of the top plate crushing zone of the main retracement channel is:

[0097]

[0098] Among them, σ t is the tensile strength of the coal seam, 2.59 MPa; K1 is the safety factor of the three support areas A, B, and C, 4; K2 is the surface strengthening coefficient after adding the mesh, 2; B is the roadway width, 6.6 m; q is the approximately uniformly distributed load above the composite beam, q = 0.2145 on the non-mining side; the depth of the roof crushing zone of the anchor withdrawal channel on the non-mining side of the three support areas A, B, and C is 1.3 m;

[0099] The lengths of anchor bolts on the non-mining side of the three support areas A, B, and C are:

[0100] L=L p +L1+L2

[0101] Among them, L1 is the exposed length of the anchor rod on the non-mining side of the three support areas A, B, and C, which is 0.1m; L2 is the anchor length of the anchor rod on the non-mining side of the three support areas A, B, and C, which is 0.5m; the anchor rod length on the non-mining side of the three support areas A, B, and C is 1.9m;

[0102] The diameter D of the anchor bolts on the non-mining side of the three support areas A, B, and C is:

[0103]

[0104] Wherein, T is the pull-out force of the anchor rod on the non-mining side of the three support areas A, B, and C, which is 80KN; [σ] is the allowable strength of the anchor rod material on the non-mining side of the three support areas A, B, and C, which is 335Mpa; the diameter of the anchor rod on the non-mining side of the three support areas A, B, and C is 18.5mm;

[0105] The spacing a between the anchor bolts on the non-mining side of the three support areas A, B, and C is:

[0106]

[0107] Where a is the spacing between anchor bolts on the non-mining side of the three support areas A, B, and C, which are equal, m; Q is the design anchoring force of the anchor bolts on the non-mining side of the three support areas A, B, and C, 110 kN; γ is the average gravity density of the unstable rock formation, 25 kN; the depth of the top plate crushing zone of the main withdrawal channel is 1.3 m; K is the safety factor of the three support areas A, B, and C, 2; the spacing between anchor bolts on the non-mining side of the three support areas A, B, and C is 1300 × 1100 mm;

[0108] Step 6: Obtain parameters of the mining side anchor rods of the roof support areas A, B, and C, wherein the parameters of the mining side anchor rods include the mining side anchor rod length, the mining side anchor rod diameter, and the spacing between the mining side anchor rods;

[0109] The depth Lp of the top plate crushing zone of the main retracement channel is:

[0110]

[0111] Among them, σt is the tensile strength of the coal seam, 2.59 MPa; K1 is the safety factor of the three support areas A, B, and C, 4; K2 is the surface strengthening coefficient after adding the mesh, 2; B is the roadway width, 6.6 m; q is the approximately uniformly distributed load above the composite beam, 0.3914; the depth of the roof crushing zone of the three support areas A, B, and C in the main withdrawal channel is 1.7 m;

[0112] The lengths of the anchor bolts on the mining side of the three support areas A, B, and C are:

[0113] L=Lp+L1+L2

[0114] Among them, L1 is the exposed length of the anchor bolt on the mining side of the three support areas A, B, and C, 0.1m;

[0115] L2 is the anchor length of the non-mining side anchor bolts in the three support areas A, B, and C, which is 0.5m; the length of the mining side anchor bolts in the three support areas A, B, and C is 2.3m;

[0116] The diameter D of the mining side anchor bolts in the three support areas A, B, and C is:

[0117]

[0118] Where T is the pull-out force of the anchor bolt on the mining side of the three support areas A, B, and C, 100KN; [σ] is the allowable strength of the rod material, 335Mpa; the diameter of the anchor bolt on the mining side of the three support areas A, B, and C is 19.5mm;

[0119] The spacing a between the anchor bolts on the mining side of the three support areas A, B, and C is:

[0120]

[0121] Among them, a is the spacing between the anchor bolts on the mining side of the three support areas A, B, and C, and the spacing between the rows is equal, m; Q is the design anchoring force of the anchor bolts on the mining side of the three support areas A, B, and C, which is 130kN on the mining side; γ is the average gravity density of the unstable rock formation, 25kN; the depth of the roof crushing zone of the main retreat channel is 1.3m; K is the safety factor of the three support areas A, B, and C, 2; the anchor bolt spacing on the mining side of the three support areas A, B, and C is 1300mm, and the anchor bolt spacing on the mining side is 1100mm;

[0122] Based on the above and the technical requirements for anchor support design in the "GB35056-2018 Technical Specification for Anchor Support of Coal Mine Roadways", the support parameter scheme for the roof anchor of the main retreat channel is determined as follows: the roof anchor length in area A is 2.4m, the roof anchor diameter is 24mm, and the row spacing between roof anchors is 1200×1200mm; the roof anchor cable length is 12.8m, and the row spacing between roof anchor cables is 2m; the non-minable side anchor length is 1.9m, the non-minable side anchor diameter is 18.5mm, and the row spacing between non-minable side anchors is 1300×1100mm; the mining side anchor length is 2.3m, the mining side anchor diameter is 19.5mm, and the row spacing between mining side anchors is 1300×1100mm;

[0123] In area B, the roof bolt length is 2.4m, the diameter is 24mm, and the spacing between the roof bolts is 1200×1200mm. The roof anchor cable length is 12.8m, and the spacing between the roof anchor cables is 1.5m. The non-minable side bolt length is 1.9m, the diameter is 18.5mm, and the spacing between the non-minable side bolts is 1300×1100mm. The mining side bolt length is 2.3m, the diameter is 19.5mm, and the spacing between the mining side bolts is 1300×1100mm.

[0124] In area C, the length of the roof anchor rod is 2.4m, the diameter of the roof anchor rod is 24mm, and the spacing between the roof anchor rods is 1200×1200mm. The length of the roof anchor cable is 12.8m, and the spacing between the roof anchor cables is 1m. The length of the non-minable side anchor rod is 1.9m, the diameter of the non-minable side anchor rod is 18.5mm, and the spacing between the non-minable side anchor rods is 1300×1100mm. The length of the mining side anchor rod is 2.3m, the diameter of the mining side anchor rod is 19.5mm, and the spacing between the mining side anchor rods is 1300×1100mm.

[0125] The determination method of the present invention can not only ensure that the coal mine working face supports are withdrawn in a safe state, but also reduce production costs and improve production efficiency, while providing a theoretical basis for the support design and related research of the main retreat tunnel of the coal mine.

[0126] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for determining the zoning support of anchor rods or anchor cables in a super-large working face withdrawal channel, characterized in that: include: Based on the structure of the main retracement channel, draw the bending moment curve of the main retracement channel; Combined with the bending moment curve, the main retreat channel is divided into three support areas: A, B, and C; Obtain the parameters of the top plate anchor rods in support areas A, B, and C; Obtain the parameters of the top plate anchor cables in support areas A, B, and C; Obtain the parameters of the non-mining side anchor bolts of the roof in the A, B, and C support areas. Obtain the parameters of the side anchors for roof mining in support areas A, B, and C.

2. The method for determining the anchor rod or anchor cable zoning support for the withdrawal channel of a super-large working face according to claim 1 is characterized in that: The parameters of the roof anchor rod include the length of the roof anchor rod, the diameter of the roof anchor rod and the spacing between the roof anchor rods.

3. The method for determining the anchor rod or anchor cable zoning support for the withdrawal channel of a super-large working face according to claim 1 is characterized in that: The parameters of the roof anchor cables include the length of the roof anchor cables and the spacing between the roof anchor cables.

4. The method for determining the anchor rod or anchor cable partition support for the withdrawal channel of a super-large working face according to claim 1 is characterized in that: The parameters of the anchor rods on the non-mining side of the roof include the length of the anchor rods on the non-mining side of the roof, the diameter of the anchor rods on the non-mining side of the roof, and the spacing between the anchor rods on the non-mining side of the roof.

5. The method for determining the anchor rod or anchor cable zoning support for the withdrawal channel of a super-large working face according to claim 1 is characterized in that: The parameters of the roof mining side anchor rods include the length of the roof mining side anchor rods, the diameter of the roof mining side anchor rods and the spacing between the roof mining side anchor rods.

6. A method for determining anchor rod or anchor cable zoning support for a super-large working face withdrawal channel according to claim 2, 4 or 5, characterized in that: The depth Lp of the top plate crushing zone of the main retracement channel is obtained as follows: Among them, σ t is the tensile strength of the coal seam, in MPa; K1 is the safety factor; K2 is the surface strengthening coefficient after adding the mesh; B is the tunnel width, in m; q is the approximately uniformly distributed load above the composite beam.

7. The method for determining the anchor rod or anchor cable zoning support for the withdrawal channel of a super-large working face according to claim 6 is characterized in that: The parameters of the roof anchor are obtained as follows: The length L of the top plate anchor rod in the A, B, and C support areas is: L=L p +L1+L2 Wherein, L1 is the exposed length of the top plate anchor rods in the support areas A, B, and C, in meters; L2 is the anchored length of the top plate anchor rods in the support areas A, B, and C, in meters; The diameter D of the top plate anchor rod in the A, B, and C support areas is: Wherein, T is the pull-out force of the top plate anchor rod in the support areas A, B, and C, in KN; [σ] is the allowable strength of the top plate rod material in the support areas A, B, and C, in MPa; The spacing a between the top plate anchor bolts in the A, B, and C support areas is: Where a is the spacing between the top plate anchor rods in the A, B, and C support areas, in m; Q is the design anchoring force of the top plate anchor rods in the A, B, and C support areas, in kN; γ is the average gravity density of the unstable rock formation in the A, B, and C support areas, in kN; L p It is the depth of the top plate crushing zone of the main retracement channel, in meters; K is the safety factor.

8. The method for determining the anchor rod or anchor cable zoning support for the withdrawal channel of a super-large working face according to claim 3 is characterized in that: The parameters of the top plate anchor cable are obtained as follows: The length of the top plate anchor cable Ld in the A, B, and C support areas is: X=X1+X2+X3 Among them, X1 is the exposed length of the top plate anchor cable in the support areas A, B, and C, in meters; X2 is the anchored length of the top plate anchor cable in the support areas A, B, and C, in meters; X3 is the height of the potentially unstable rock formation in the support areas A, B, and C, in meters; The spacing between the top plate anchor cables in the A, B, and C support areas is: Where σ is the breaking load of the roof anchor cable in the A, B, and C support areas, in kN; γ is the coal rock volume force, in KN / m 3 ; B is the tunnel width, unit is m; K is the safety factor.

9. The method for determining the anchor rod or anchor cable zoning support for the withdrawal channel of a super-large working face according to claim 6 is characterized in that: The parameters of the non-mining side anchor bolts of the roof are obtained as follows: The length of the anchor bolt L on the non-mining side of the support areas A, B, and C is: L=L p +L1+L2 Wherein, L1 is the exposed length of the anchor bolt on the non-mining side of the support area A, B, and C, in meters; L2 is the anchor length of the anchor bolt on the non-mining side of the support area A, B, and C, in meters; The diameter D of the anchor bolt on the non-mining side of the support areas A, B, and C is: Wherein, T is the anchor pull-out force in the support areas A, B, and C, in KN; [σ] is the allowable strength of the anchor material on the non-mining side of the support areas A, B, and C, in MPa; The spacing a between anchor bolts on the non-mining side of the A, B, and C support areas is: Where a is the spacing between anchor bolts on the non-mining side of the support areas A, B, and C, in m; Q is the designed anchoring force of anchor bolts on the non-mining side of the support areas A, B, and C, in kN; γ is the average gravity density of unstable rock formations in the support areas A, B, and C, in kN; L p It is the depth of the top plate crushing zone of the main retracement channel, in meters; K is the safety factor.

10. The method for determining the anchor rod or anchor cable zoning support for the withdrawal channel of a super-large working face according to claim 6, characterized in that: The parameters of the roof mining side anchor are obtained as follows: The length of the roof anchor bolts on the mining side of the A, B, and C support areas is: L=L p +L1+L2 Among them, L1 is the exposed length of the anchor bolt on the mining side of the support areas A, B, and C, in meters; L2 is the anchor length of the anchor bolt on the mining side of the support areas A, B, and C, in meters; The diameter D of the roof anchor bolt on the mining side of the A, B, and C support areas is: Where T is the anchor pull-out force on the mining side of the A, B, and C support areas, in kN; [σ] is the allowable strength of the mining side anchor material, in MPa; The spacing a between the anchor bolts on the mining side roof of the A, B, and C support areas is: Where a is the spacing between the anchor bolts on the mining side of the A, B, and C support areas, in m; Q is the designed anchoring force of the anchor bolts on the mining side of the A, B, and C support areas, in kN; γ is the average gravity density of the unstable rock formation in the A, B, and C support areas, in kN; L p It is the depth of the top plate crushing zone of the main retracement channel, in meters; K is the safety factor.

Images