Connecting type opposite-penetrating anchor cable reinforcing system under double-lane arrangement

Abstract

The invention discloses a connecting type opposite-penetrating anchor cable reinforcing system under double-roadway arrangement, and relates to the technical field of coal pillar anchoring. Comprising a plurality of reinforcing units and is used for implementing two-way collaborative anchoring on supporting coal pillars between a first working face haulage roadway and a second working face air return roadway. The reinforcing unit adopts a supporting framework formed by cross combination of constant-resistance large-deformation anchor cables and yielding device anchor cables, the constant-resistance large-deformation anchor cables and a yielding mechanism of the yielding device anchor cables form mechanical complementation through continuous high resistance and large deformation characteristics of the constant-resistance large-deformation anchor cables, and a three-dimensional stress balance system is constructed in the supporting coal pillar; the first working face haulage roadway is a current mining face, and the second working face air return roadway is a to-be-mined face. And through cross use of the yielding device anchor cable and the constant-resistance large-deformation anchor cable, the bearing capacity of the coal pillar under the pressure of the rock mass is greatly improved, the size of the coal pillar is optimized and reduced, and the coal recovery rate is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of coal pillar anchoring, and particularly to a connecting type through - anchor cable reinforcement system under double - roadway layout. Background Art

[0002] During the deep - mine exploitation process, with the continuous increase of mining depth and the continuous enhancement of mining intensity, the stress of roadway surrounding rock shows a significant growth trend, which is particularly prominent under the condition of double - roadway layout. Specifically, the support coal pillar bears complex lateral pressure and roof pressure simultaneously, making the surrounding - rock control face severe challenges. The existing support technologies mainly have the following key problems:

[0003] 1. Insufficient adaptability to deep high - stress environment: As the mining depth increases, the stress of surrounding rock increases significantly, and traditional bolt support generally shows the phenomenon of anchoring failure under high - pressure environment; typically manifested as deformation problems such as rib spalling and floor heave of the roadway, seriously affecting the stability of the roadway.

[0004] 2. Poor effect of double - roadway collaborative support: Under the condition of double - roadway layout, the composite stress state borne by the support coal pillar is more complex; the existing support methods are difficult to form an effective lateral constraint system; the insufficient bearing capacity of the coal pillar is prone to cause the risk of overall instability.

[0005] 3. Limitations in the performance of the support system: Traditional bolt support has inherent defects such as limited anchoring force and poor deformation adaptability; under the condition of large deformation of surrounding rock, bolt fracture or overall outward movement is likely to occur; although the existing cable - anchor support has a large anchoring force, it lacks the characteristics of constant resistance and large deformation.

[0006] 4. Insufficient systematicness in support design: The current design mostly adopts the single - roadway independent support mode; lacks overall consideration of double - roadway collaborative support; it is difficult to form effective mechanical connections on both sides of the coal pillar;

[0007] 5. Poor adaptability to special geological conditions: Under complex geological conditions such as soft roof and well - developed joints and fissures; the existing support system is difficult to effectively control the deformation of surrounding rock; resulting in a large amount of roadway repair work and high maintenance costs. Summary of the Invention

[0008] The purpose of the present invention is to provide a connecting type through - anchor cable reinforcement system under double - roadway layout. By cross - using yield - type anchor cables and constant - resistance large - deformation anchor cables, the bearing capacity of the coal pillar under rock mass pressure is greatly improved, the size of the coal pillar is optimized and reduced, and the coal recovery rate is increased.

[0009] To achieve the above object, the technical solution of the present application is as follows: A connecting type through-anchor cable reinforcement system under double-gallery layout, including a number of reinforcement units, which are used for implementing two-way collaborative anchoring on the support coal pillar between the first working face transportation roadway and the second working face return airway; the reinforcement unit adopts a support structure in which a constant-resistance large-deformation anchor cable and a pressure-relieving anchor cable are cross-combined. Among them, the constant-resistance large-deformation anchor cable forms a mechanical complement with the pressure-relieving mechanism of the pressure-relieving anchor cable through its continuous high resistance and large-deformation characteristics, and constructs a three-dimensional stress balance system inside the support coal pillar.

[0010] As a preferred embodiment of the present invention, the first working face transportation roadway is the current mining face, and the second working face return airway is the face to be mined.

[0011] As a preferred embodiment of the present invention, the pressure-relieving anchor cable includes a first pressure-relieving main anchor cable section, a pressure-relieving cable and a second pressure-relieving main anchor cable section connected in sequence. Among them, both the first pressure-relieving main anchor cable section and the second pressure-relieving main anchor cable section include a pressure-relieving lock, a pressure-reliever and a pressure-relieving tray connected in sequence. The two ends of the pressure-relieving cable pass through the corresponding pressure-relieving trays, pressure-relievers and pressure-relieving locks in sequence.

[0012] As a preferred embodiment of the present invention, the constant-resistance large-deformation anchor cable includes a first constant-resistance main anchor cable section, a constant-resistance cable and a second constant-resistance main anchor cable section connected in sequence. Among them, both the first constant-resistance main anchor cable section and the second constant-resistance main anchor cable section include a constant-resistance lock, a constant-resistance tray and a constant-resistance rod connected in sequence. The two ends of the constant-resistance cable pass through the corresponding constant-resistance rods, constant-resistance trays and constant-resistance locks in sequence.

[0013] As a preferred embodiment of the present invention, a number of drill holes are provided on the support coal pillar. The first pressure-relieving main anchor cable section and the second pressure-relieving main anchor cable section are locked on one side of the drill hole through the pressure-relieving locks. At this time, the pressure-relieving tray is attached to the surface of the support coal pillar; the first constant-resistance main anchor cable section and the second constant-resistance main anchor cable section are locked on one side of the drill hole through the constant-resistance locks. At this time, the constant-resistance tray is attached to the surface of the support coal pillar.

[0014] As a preferred embodiment of the present invention, the pressure-relieving cable passes through the corresponding first pressure-relieving main anchor cable section from the other side of the drill hole and is locked by the second pressure-relieving main anchor cable section. The constant-resistance cable passes through the corresponding first constant-resistance main anchor cable section from the other side of the drill hole and is locked by the second constant-resistance main anchor cable section.

[0015] As a preferred embodiment of the present invention, the first pressure-relieving main anchor cable section and the first constant-resistance main anchor cable section are located on the side of the first working face transportation roadway, and the second pressure-relieving main anchor cable section and the second constant-resistance main anchor cable section are located on the side of the second working face return airway, forming a through-reinforcement structure.

[0016] As a preferred embodiment of the present invention, the constant-resistance large-deformation anchor cables and the pressure-relieving anchor cables are arranged in columns on the support coal pillar.

[0017] As a preferred embodiment of the present invention, constant-resistance large-deformation anchor cables are arranged at equal intervals on odd-numbered columns, and pressure-relief anchor cables are arranged at equal intervals on even-numbered columns.

[0018] As a preferred embodiment of the present invention, the constant-resistance large-deformation anchor cables and pressure-relief anchor cables that are cross-arranged horizontally are distributed at equal intervals.

[0019] Due to the adoption of the above technical solutions, the present invention can achieve the following technical effects: By adopting the cross-support technology of through-going anchor cables in combination with pressure-relief anchor cables and constant-resistance large-deformation NPR anchor cables, the present invention realizes the efficient reinforcement of coal pillars. By optimizing the spatial arrangement of the anchor cables, a three-dimensional support network with two-way cross is constructed in the vertical and horizontal directions, so that the stress state of the coal pillar is improved from the traditional two-way stress to three-way stress, thereby effectively suppressing the deformation and failure of the coal pillar.

[0020] Compared with the traditional double-heading technology that requires a coal pillar with a width of 20 - 30 m, through the synergistic effect of the pressure-relief anchor cables and the constant-resistance large-deformation NPR anchor cables, the present invention significantly improves the compressive bearing capacity of the coal pillar while greatly reducing the size of the reserved coal pillar. This innovation not only improves the stability of the narrow coal pillar but also significantly increases the coal recovery rate, reduces resource waste, and has important engineering application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 It is a schematic diagram of the structure of each working face in actual work;

[0023] Figure 2 It is a schematic diagram of the structure of the constant-resistance large-deformation anchor cable;

[0024] Figure 3 It is a schematic diagram of the structure of the pressure-relief anchor cable;

[0025] Figure 4 It is a plan view of the two-way through-going anchor cables for the narrow coal pillar under the double-heading layout;

[0026] Figure 5 It is an elevation view of the two-way through-going anchor cables for the narrow coal pillar under the double-heading layout;

[0027] Figure 6 It is a schematic diagram of the cross arrangement of the constant-resistance large-deformation anchor cable and the pressure-relief anchor cable;

[0028] Explanation of the serial numbers in the figure: 1: Return air roadway; 2: Coal pillar; 3: Haulage roadway; 4: High resistance large deformation anchor cable; 5: Yielding pressure anchor cable; 6: High resistance locking device; 7: High resistance tray; 8: High resistance rod; 9: High resistance cable; 10: Yielding pressure locking device; 11: Yielding pressure device; 12: Yielding pressure tray; 13: Yielding pressure cable; 14: First working face; 15: Second working face. Detailed implementation manners

[0029] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer, the present application will be 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 the present application and are not used to limit the present application.

[0030] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can 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 can be directly connected to the other element or indirectly connected to the other element.

[0031] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality" means two or more, unless otherwise specifically defined. "Several" means one or more, unless otherwise specifically defined.

[0032] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present application.

[0033] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0034] Example 1

[0035] Please refer to Figures 1-6 , this embodiment provides a connected through-anchor cable reinforcement system under double-gallery layout, which includes a number of reinforcement units for two-way collaborative anchoring of the support coal pillar between the transportation roadway of the first working face (current mining face) and the return air roadway of the second working face (to-be-mined face). The reinforcement unit adopts a support structure with a cross combination of constant-resistance large-deformation anchor cables (NPR anchor cables) and yielding-pressure anchor cables. Among them: The constant-resistance large-deformation anchor cable adapts to the plastic deformation of the coal pillar through its continuous high resistance and large-deformation characteristics; the yielding-pressure anchor cable relieves stress concentration and prevents the premature breakage of the anchor cable through a controllable yielding mechanism; the two work together to build a three-dimensional stress balance system inside the coal pillar and improve the overall stability.

[0036] In this embodiment, the yielding-pressure anchor cable includes: The yielding-pressure main anchor cable section (located on the roadway side) has a yielding-pressure lock, a yielding-pressure device, and a yielding-pressure tray; the yielding-pressure stranded cable (penetrating the coal pillar) passes through the corresponding yielding-pressure trays, yielding-pressure devices, and yielding-pressure locks at both ends in sequence to form a slidable yielding-pressure structure.

[0037] The constant-resistance large-deformation anchor cable (NPR anchor cable) includes: The constant-resistance main anchor cable section (located on the roadway side) has a constant-resistance lock, a constant-resistance tray, and a constant-resistance rod; the constant-resistance stranded cable (penetrating the coal pillar) passes through the corresponding constant-resistance rods, constant-resistance trays, and constant-resistance locks at both ends in sequence to provide high constant resistance and large-deformation ability.

[0038] In this embodiment, a number of through-boreholes are drilled in the support coal pillar; the yielding-pressure main anchor cable section is respectively fixed on the side of the transportation roadway of the first working face and the side of the return air roadway of the second working face through the yielding-pressure lock, and the yielding-pressure tray fits the surface of the coal pillar; the constant-resistance main anchor cable section is respectively fixed on the side of the transportation roadway of the first working face and the side of the return air roadway of the second working face through the constant-resistance lock, and the constant-resistance tray fits the surface of the coal pillar to form a through-reinforcement structure.

[0039] In this embodiment, the constant-resistance large-deformation anchor cables and the yielding-pressure anchor cables are arranged in a columnar cross pattern: The constant-resistance large-deformation anchor cables are arranged at equal intervals in odd-numbered columns; the yielding-pressure anchor cables are arranged at equal intervals in even-numbered columns; horizontally, the two types of anchor cables are staggered and equally spaced to form a three-dimensional support network, enabling the coal pillar to change from two-way stress to three-way stress.

[0040] The effects of this embodiment are: 1. Bidirectional collaborative reinforcement: The through-type arrangement realizes the coordinated support of the two tunnels, avoiding the stress imbalance problem of traditional unilateral anchoring. 2. Mechanical complementarity: The constant resistance anchor cable provides high resistance, allowing the pressure anchor cable to absorb deformation energy, and jointly maintain the stability of the coal pillar. 3. Three-dimensional stress optimization: The cross arrangement forms a spatial constraint, which improves the shear and compression resistance of the coal pillar. 4. Efficient utilization of resources: Compared with the traditional 20-30m wide coal pillar, the present invention can greatly reduce the size of the coal pillar and improve the coal recovery rate. 5. It is suitable for the reinforcement of narrow coal pillars (5-10m) under double-tunnel excavation conditions, and is especially suitable for supporting deep high-stress coal seams or soft rock tunnels.

[0041] Example 2

[0042] This embodiment provides a method for constructing a through-anchor cable in coal mine production, which is implemented based on the system described in Example 1 and specifically includes:

[0043] Step 1: Drilling

[0044] In the first working face haul roadway, drill horizontal through-holes on the support coal pillars perpendicular to the haul roadway, extending to the return air roadway side of the second working face. Drilling must ensure the axis is straight, with an allowable deviation of ≤2%.

[0045] Step 2: Anchor cable pretreatment

[0046] According to the thickness of the supporting coal pillar, the appropriate length of the pressure-yielding rope and the constant resistance rope are cut in advance to ensure that their length can completely cover the borehole and reserve sufficient cutting margin.

[0047] Step 3: Anchor Cable Installation

[0048] The pre-treated pressure-yielding ropes and constant resistance ropes are alternately arranged in the drill hole according to the designed spacing to form a cross support structure, and it is ensured that the pressure-yielding ropes and constant resistance ropes extend outward from the exposed ends on the transport tunnel side of the first working face, and the anchoring ends extend to the return air tunnel side of the second working face.

[0049] Step 4: Constant resistance cable reinforcement and tensioning

[0050] On the transport tunnel side of the first working face, the first constant resistance main anchor cable section is installed in sequence, and then a tensioning pre-tightening force is applied to the constant resistance winch.

[0051] Step 5: Strengthen and tension the compression rope

[0052] On the transport tunnel side of the first working face, the first pressure-yielding main anchor cable segments are installed in sequence, and then tensioning pre-tightening force is applied to the pressure-yielding strands to ensure that they are tightly engaged with the sidewall of the coal pillar.

[0053] Step 6: Installation of the main anchor cable section on the return air tunnel side of the second working face

[0054] After the heading of the return airway in the second working face reaches the corresponding borehole, cut off the extended parts of the yielding cable and the constant-resistance cable on the side of the return airway in the second working face, and sequentially install the corresponding second constant-resistance main cable section and the second yielding main cable section to ensure the coordinated stress of the cables on both sides.

[0055] Step 7: Cable Tensioning and Coal Pillar Reinforcement

[0056] On the side of the return airway in the second working face, apply a tensile pre-tightening force to the constant-resistance cable to make it reach the constant-resistance range (200 - 250 kN) to provide continuous high-resistance support; then apply a tensile pre-tightening force (150 - 250 kN) to the yielding cable and utilize its yielding characteristics to relieve the deformation stress of the coal pillar.

[0057] After applying the tensile pre-tightening force, the constant-resistance trays and yielding trays on both sides are closely attached to the surface of the supported coal pillar. Through the coordinated action of the trays on both sides, the biting effect of the side wall of the coal pillar is enhanced, and the overall deformation resistance of the coal pillar is improved.

[0058] This construction method changes the bi-axial stress of the supported coal pillar to tri-axial stress through the cross arrangement and step-by-step tensioning of the bi-directional through-cable, effectively improving its stability and bearing capacity. At the same time, the coordinated support of the constant-resistance large-deformation cable and the yielding cable is adopted, which not only adapts to the large deformation of the surrounding rock but also avoids the cable breakage caused by stress concentration, ensuring the long-term stability of the narrow coal pillar during the mining process.

[0059] As a preferred implementation provided in this embodiment, the method for obtaining the vertical stress on the supported coal pillar is as follows:

[0060] First, obtain the stress of the overlying strata (original in-situ stress) on the supported coal pillar:

[0061] σ 原始 =γ·H 埋深

[0062] Where: γ is the average unit weight of the overlying strata; H 埋深 is the buried depth of the coal seam (m);

[0063] Then, obtain the additional mining stress (stress concentration coefficient M):

[0064] Δσ 采动 =M×σ 原始

[0065] The total vertical stress is:

[0066] σ = σ 原始 +Δσ 采动

[0067] As a preferred implementation provided in this embodiment, compare the total vertical stress σ with the uniaxial compressive strength σ c (MPa):

[0068] If σ ≥ σ c , the coal pillar has entered the plastic deformation stage, and it is necessary to further calculate the elastic and plastic compression amounts;

[0069] If σ < σ c , the coal pillar is still in the elastic stable state.

[0070] As the preferred implementation provided in this embodiment, the method for obtaining the elastic compression amount is:

[0071]

[0072] In the formula: ΔL e is the elastic compression amount (Mpa); H is the height of the coal pillar (m); E is the elastic modulus of the coal body (Mpa).

[0073] The plastic compression amount ΔL p The acquisition method is:

[0074] ΔL p = ε p ·H

[0075] In the formula: H is the height of the coal body (m); ε p is the plastic strain (Mpa); the plastic strain ε p (empirical formula) is:

[0076]

[0077] In the formula: ε p is the plastic strain (Mpa); C is the plastic parameter; m is the mining concentration coefficient.

[0078] Therefore, the total compression amount:

[0079] ΔL 总 = ΔL e + ΔL p

[0080] As the preferred implementation provided in this embodiment, the size effect (height-width ratio H / W) correction is performed on the total compression amount:

[0081] ΔL 修正 = β × ΔL 总

[0082] Then, the time effect correction is performed:

[0083] ΔL 长期 = ΔL 修正 + ΔL 蠕变

[0084] Among them, β is the correction coefficient, and ΔL 蠕变 is obtained through the creep test.

[0085] As the preferred implementation provided in this embodiment, the safety factor is taken as N, and it is required to satisfy:

[0086] Δ 锚索 > N × ΔL 长期

[0087] Wherein, Δ 锚索 is the deformation amount of the anchor cable;

[0088] In this embodiment, the design requirements are: the total yielding amount of the constant-resistance large-deformation anchor cable and the yielding-pressure anchor cable ≥ 100 cm; under the double-heading layout, the yielding amount on each side ≥ 50 cm (to ensure the long-term stability of the coal pillar);

[0089] Anchoring force standard: Single-root pre-tightening force of the constant-resistance cable: 200 - 250 kN; Single-root pre-tightening force of the yielding-pressure cable: 150 - 250 kN;

[0090] The determination method of the spacing between adjacent constant-resistance large-deformation anchor cables and yielding-pressure anchor cables in each row is as follows:

[0091]

[0092] In the formula: L is the length of the constant-resistance cable and the yielding-pressure anchor cable;

[0093] The row spacing S2 between adjacent rows of yielding-pressure cables and constant-resistance cables is:

[0094]

[0095] In the formula: n2 is the number of yielding-pressure cables or constant-resistance cables in each row; h is the height of the transportation roadway or the return airway; γ is the average unit weight of the overlying strata; Qs is the lateral pressure value; Ku is the influence coefficient of the advanced abutment pressure on the transportation roadway or the influence coefficient after the first mining disturbance of the return airway; α is the dip angle of the coal seam; is the internal friction angle of the coal body.

[0096] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A connected through-anchor cable reinforcement system under double-gallery layout, characterized in that It includes several reinforcement units for implementing two-way collaborative anchoring on the support coal pillar between the first working face transportation roadway and the second working face return airway; the reinforcement unit adopts a support structure with a cross combination of constant-resistance large-deformation anchor cables and yield-pressure anchor cables. Among them, the constant-resistance large-deformation anchor cable forms a mechanical complement with the yield-pressure mechanism of the yield-pressure anchor cable through its continuous high resistance and large-deformation characteristics, and constructs a three-dimensional stress balance system inside the support coal pillar.

2. The connecting type through-anchor cable reinforcement system under the double-gallery layout according to claim 1, characterized in that The first working face transportation roadway is the current mining face, and the second working face return airway is the face to be mined.

3. The connecting type through-anchor cable reinforcement system under the double-gallery layout according to claim 1, characterized in that, The yield-pressure anchor cable includes a first yield-pressure main anchor cable section, a yield-pressure stranded cable, and a second yield-pressure main anchor cable section connected in sequence. Among them, both the first yield-pressure main anchor cable section and the second yield-pressure main anchor cable section include a connected yield-pressure lock, a yield-pressure device, and a yield-pressure tray. The two ends of the yield-pressure stranded cable pass through the corresponding yield-pressure tray, yield-pressure device, and yield-pressure lock in sequence.

4. The connecting type through-anchor cable reinforcement system under the double-gallery layout according to claim 3, wherein, The constant-resistance large-deformation anchor cable includes a first constant-resistance main anchor cable section, a constant-resistance stranded cable, and a second constant-resistance main anchor cable section connected in sequence. Among them, both the first constant-resistance main anchor cable section and the second constant-resistance main anchor cable section include a connected constant-resistance lock, a constant-resistance tray, and a constant-resistance rod. The two ends of the constant-resistance stranded cable pass through the corresponding constant-resistance rod, constant-resistance tray, and constant-resistance lock in sequence.

5. The connecting type through-anchor cable reinforcement system under the double-gallery layout according to claim 4, characterized in that, Several drill holes are provided on the support coal pillar. The first yield-pressure main anchor cable section and the second yield-pressure main anchor cable section are locked on one side of the drill hole through the yield-pressure lock. At this time, the yield-pressure tray is in contact with the surface of the support coal pillar; the first constant-resistance main anchor cable section and the second constant-resistance main anchor cable section are locked on one side of the drill hole through the constant-resistance lock. At this time, the constant-resistance tray is in contact with the surface of the support coal pillar.

6. The connecting type through-anchor cable reinforcement system under the double-gallery layout according to claim 5, characterized in that The yield-pressure stranded cable passes through the corresponding first yield-pressure main anchor cable section from the other side of the drill hole and is locked through the second yield-pressure main anchor cable section. The constant-resistance stranded cable passes through the corresponding first constant-resistance main anchor cable section from the other side of the drill hole and is locked through the second constant-resistance main anchor cable section.

7. The connecting type through-anchor cable reinforcement system under the double-gallery layout according to claim 6, wherein, The first yield-pressure main anchor cable section and the first constant-resistance main anchor cable section are located on the side of the first working face transportation roadway, and the second yield-pressure main anchor cable section and the second constant-resistance main anchor cable section are located on the side of the second working face return airway, forming a through-through reinforcement structure.

8. The connecting type through-anchor cable reinforcement system under the double-gallery layout according to claim 1, characterized in that, The constant-resistance large-deformation anchor cables and the yield-pressure anchor cables are arranged in columns on the support coal pillar.

9. The connecting type through-anchor cable reinforcement system under the double-gallery layout according to claim 8, wherein, Constant-resistance large-deformation anchor cables are arranged at equal intervals on odd-numbered columns, and yield-pressure anchor cables are arranged at equal intervals on even-numbered columns.

10. The connecting through-anchor cable reinforcement system under the double-gallery layout according to claim 8 or 9, characterized in that, The constant-resistance large-deformation anchor cables and the yield-pressure anchor cables that are cross-set horizontally are equally spaced.

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