Method for arranging a rock burst roadway

Abstract

The present application relates to the technical field of coal mining, and provides a method for arranging a rock burst roadway, comprising: fracturing a roof in a first roadway in a length direction of the first roadway after mining of a first working face is completed, wherein the first roadway, a second working face and the first working face are arranged in sequence; filling gangue concrete in the first roadway to form a first support body during mining of the second working face, the length of the first support body being the same as the length of the first roadway, and a top surface of the first support body abutting against the roof of the first roadway. The method for arranging the rock burst roadway fractures the roof in the first roadway, realizes roof cutting and pressure relief, fills the gangue concrete in the first roadway to form the first support body, the strength of the first support body is much greater than the strength of the coal seam, the first support body forms a strong support for the roof of the first roadway, reduces occurrence of rock burst of the roadway, and simultaneously, a coal pillar is not required to be left, and the recovery rate of coal resources is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coal mining, and particularly relates to a method for arranging a rock burst roadway. BACKGROUND

[0002] With the increasing of mining intensity and mining depth, rock burst disaster has become one of the major disasters threatening the safety production of deep coal mines. Under the superimposed influence of deep high ground stress, mining stress and other factors, a large amount of elastic energy accumulated in the coal and rock mass is easy to cause the coal and rock mass to impact and lose stability after reaching a certain limit. At the same time, in the traditional double-lane arrangement method of working face, a coal pillar is usually left between working faces to support the roof and isolate the working faces, so that the coal pillar is subjected to high stress for a long time. When the average stress of the coal pillar exceeds the comprehensive compressive strength of the coal body, the coal pillar is easy to lose stability, which becomes a weak link of rock burst prevention and control in underground coal mines. Therefore, for deep rock burst mines, it is of important practical significance to invent a mining layout which can simultaneously realize roof support and rock burst prevention and control, for the safe mining of deep coal resources and the prevention and control of underground dynamic disasters.

[0003] At present, two methods are generally used for the prevention and control of rock burst, one is engineering pressure relief method, that is, the high stress formed is transferred or relieved through pressure relief blasting, hydraulic fracturing and other ways, but for such large system engineering as coal mining, the effect of the above-mentioned means is very limited, and it cannot fundamentally solve the problem of regional coal pillar impact hazard control, and it is time-consuming and laborious. The other method is to change the engineering layout to macroscopically control the rock mass structure so that high stress is not formed. In the second method, there are generally two forms, one is to increase the size of the coal pillar and leave a large coal pillar with a width of more than 30m (even more than 50m), and to strengthen the support, which leads to a large amount of coal pillars left in the underground and cannot be mined out, reducing the coal recovery rate. At the same time, under the action of high stress, the coal pillar itself will inevitably have a plastic zone or damage zone distributed on both sides and an elastic zone or support core distributed in the middle. With the influence of repeated mining disturbance, the coal pillar is continuously deteriorated to the headquarters support core area, and there is also a risk of impact; the second is not to leave a coal pillar, which requires the method of gob-side entry retaining, that is, the roadway of the previous working face is retained through technical means and directly used as the roadway of the next working face. Although this method saves the excavation of roadway, it requires relatively simple geological conditions of the coal mining face, such as coal seam thickness not higher than 4.5m, easy caving of immediate roof, etc., and it also causes some other forms of roadway stability control problems, such as strong floor heave, local roof fall and other outburst problems, which are difficult to control, and the gob-side entry retaining has strict requirements on geological conditions and complex construction method. Therefore, how to realize the simple engineering layout of not leaving a coal pillar and achieving strong support of the roof under the engineering pressure relief method has become a problem to be solved in the industry. SUMMARY

[0004] The present application provides a method for arranging a rock burst roadway, which solves the defect that rock burst in coal mining is not prevented and controlled in the prior art.

[0005] The present application provides a method for arranging a rock burst roadway, which includes: fracturing the roof in a first roadway along the length direction of the first roadway after the first working face is mined, wherein the first roadway, a second working face and the first working face are arranged in sequence; filling gangue concrete in the first roadway to form a first support body during the mining of the second working face, the length of the first support body is the same as the length of the first roadway, and the top surface of the first support body abuts against the roof of the first roadway.

[0006] According to the method for arranging rock burst roadway provided by the application, the method further comprises: excavating a second roadway and a third roadway at a third working face adjacent to the first support body, wherein the third roadway is adjacent to the first support body, and a working face between the second roadway and the third roadway is a fourth working face; after the second working face is mined, fracturing the roof in the second roadway along the length direction of the second roadway; during the mining of the fourth working face, filling gangue concrete in the second roadway to form a second support body, the length of the second support body being the same as the length of the second roadway, and the top surface of the second support body being in abutment with the roof of the second roadway; and the above steps are repeated in sequence.

[0007] According to the method for arranging rock burst roadway provided by the application, the step of excavating a second roadway and a third roadway at a third working face adjacent to the first support body further comprises: excavating the second roadway in the third working face while fracturing the roof in the first roadway along the length direction of the first roadway.

[0008] According to the method for arranging rock burst roadway provided by the application, the step of excavating a second roadway and a third roadway at a third working face adjacent to the first support body further comprises: excavating the third roadway in the fourth working face after the second working face is mined.

[0009] According to the method for arranging rock burst roadway provided by the application, the step of filling gangue concrete in the first roadway to form a first support body during the mining of the second working face further comprises: filling gangue concrete from both ends of the first roadway to the middle along the length direction of the first roadway to form the first support body.

[0010] According to the method for arranging rock burst roadway provided by the application, the step of filling gangue concrete in the first roadway to form a first support body along the length direction of the first roadway further comprises: during the mining of the second working face, filling gangue concrete behind the hydraulic support in the advancing direction of mining to form a first structure, and filling gangue concrete in front of the hydraulic support to form a second structure, the width of the second structure being the same as the width of the first roadway; the first structure and the second structure are overlapped to form the first support body.

[0011] According to the method for arranging rock burst roadway provided by the application, the method further comprises: performing anchor rod support in the third roadway.

[0012] According to the method for arranging the rock burst roadway provided by the application, the step of supporting the third roadway by anchor rods further comprises: supporting the third roadway by first anchor rods on the side adjacent to the fourth working face and supporting the third roadway by second anchor rods on the side adjacent to the first support body, wherein the strength of the first anchor rods is greater than the strength of the second anchor rods.

[0013] According to the method for arranging the rock burst roadway provided by the application, the step of supporting the third roadway by anchor rods further comprises: supporting the third roadway by anchor rods further comprises: supporting the third roadway by anchor rods on the top of the third roadway.

[0014] According to the method for arranging the rock burst roadway provided by the application, the method further comprises: after the end of the mining of each working face, filling the goaf formed by each working face with gangue so that the two sides of the first support body are in abutment with the gangue.

[0015] The method for arranging the rock burst roadway provided by the application realizes roof cutting and pressure releasing by fracturing the roof in the first roadway after the end of the mining of the first working face, fills the first roadway with gangue concrete to form a first support body, the strength of the first support body is much greater than the strength of the coal seam, the first support body forms a strong support for the roof of the first roadway, reduces the occurrence of rock burst of the roadway, does not need to leave a coal pillar, improves the recovery rate of coal resources, is especially suitable for the field of safe mining of deep rock burst mines, is stable and reliable in performance, simple in construction method, and suitable for industrialized popularization and application. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can also be obtained by those skilled in the art without any creative effort.

[0017] Figure 1 is a flow chart of the method for arranging the rock burst roadway provided by the application;

[0018] Figure 2 is a schematic view of the mining of the second working face;

[0019] Figure 3 is Figure 2 is a sectional view of A-A shown in

[0020] Figure 4 is a schematic view of the roof cutting during the mining of the second working face;

[0021] Figure 5 is one of the schematic views of the filling of the first support body;

[0022] Figure 6 This is the second schematic diagram of the first support being filled;

[0023] Figure 7 This is a schematic diagram of the excavation of the third tunnel;

[0024] Figure 8 yes Figure 7 The cross-sectional view along the BB direction shown in the figure;

[0025] Figure 9 This is a schematic diagram of the anchor bolt support in the third roadway;

[0026] Figure 10 This is a schematic diagram of the third working face during mining;

[0027] Figure label:

[0028] 11: First working face; 12: Second working face; 13: Third working face; 14: Fourth working face; 21: First roadway; 22: Second roadway; 23: Third roadway; 31: First support structure; 32: Second support structure; 40: Pressure relief crack; 50: Hydraulic support; 51: Bag; 61: First anchor bolt; 62: Second anchor bolt; 63: Anchor bolt and anchor cable; 100: Coal body; 311: First structure; 312: Second structure. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0030] The terms "first" and "second" in the specification and claims of this invention may explicitly or implicitly include one or more of those features. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0031] The following is combined Figures 1-10 The present invention describes a method for arranging roadways for rockburst.

[0032] like Figure 1 As shown in the figure, this embodiment of the invention provides a method for arranging roadways for rockburst, specifically including the following steps:

[0033] Step 01: after the end of the first working face 11 mining, the roof in the first roadway 21 is fractured along the length direction of the first roadway 21, wherein the first roadway 21, the second working face 12 and the first working face 11 are arranged in sequence; Step 02: in the process of mining the second working face 12, the gangue concrete is filled in the first roadway 21 to form a first support body 31, the length of the first support body 31 is the same as the length of the first roadway 21, and the top surface of the first support body 31 abuts against the roof of the first roadway 21.

[0034] Specifically, as shown in Figure 2 and Figure 3 , the first working face 11 and the second working face 12 are arranged adjacent to each other, and the first roadway 21 is arranged on one side of the second working face 12. After the end of the first working face 11 mining, a waiting time of 3-5 months is needed to make the overburden strata movement tend to be stable, and then the long-distance hydraulic fracturing roof cutting pressure relief is performed on the first roadway 21, a plurality of hydraulic fracturing pressure relief fractures 40 are formed in the basic roof structure of the coal seam, and the directional hydraulic fracturing roof cutting pressure relief technology is implemented.

[0035] As shown in Figure 4 and Figure 5 , in the process of mining the second working face 12, the gangue concrete is filled in the first roadway 21 behind the hydraulic support 50 in the mining advancing direction, and the gangue concrete is filled in the first roadway 21 in front of the hydraulic support 50, the gangue concrete has the characteristics of early strength and fast hardening, and after the gangue concrete in front of and behind the hydraulic support 50 in the first roadway 21 is overlapped and solidified, the first support body 31 is formed, the strength of the first support body 31 is above 30 MPa, which is much greater than the strength of the coal body, and the first support body 31 can timely abut against the roof and bear the load. Further, after the first working face 11 is mined, the gangue is backfilled into the mined-out area formed by the first working face 11, one side of the first support body 31 abuts against the gangue, the other side abuts against the coal body 100, and the top surface of the first support body 31 abuts against the top surface of the first roadway 21, thereby forming a lateral limiting structure and enhancing the stability of the first roadway 21.

[0036] The method for arranging the rock burst roadway provided by the embodiment of the present application fractures the roof in the first roadway after the end of the first working face mining, realizes the roof cutting pressure relief, fills the gangue concrete in the first roadway to form a first support body, the strength of the first support body is much greater than the strength of the coal seam, the first support body forms a strong support for the roof of the first roadway, reduces the occurrence of the rock burst of the roadway, and improves the recovery rate of the coal resources without the need of leaving a coal pillar, which is particularly suitable for the field of safe mining of deep rock burst coal mines, has stable and reliable performance, simple construction method, and is suitable for industrialized popularization and application.

[0037] As shown in Figure 7 , Figure 8 and Figure 10As shown, in the embodiment of the present application, the method for arranging the rock burst roadway further comprises the following steps:

[0038] The second roadway 22 and the third roadway 23 are excavated at the third working face 13 adjacent to the first support body 31, wherein the third roadway 23 is adjacent to the first support body 31, and the working face between the second roadway 22 and the third roadway 23 is the fourth working face 14; after the stoping of the second working face 12 is completed, the roof in the second roadway 22 is fractured along the length direction of the second roadway 22; in the process of stoping the fourth working face 14, the gangue concrete is filled in the second roadway 22 to form the second support body 32, the length of the second support body 32 is the same as the length of the second roadway 22, and the top surface of the second support body 32 is in abutment with the roof of the second roadway 22; the above steps are repeated in sequence.

[0039] Specifically, the third working face 13 and the second working face 12 are respectively located at two sides of the first roadway 21, the second roadway 22 and the third roadway 23 are excavated at the third working face 13, the roof in the second roadway 22 is fractured for long distance hydraulic pressure cutting and pressure relief before the fourth working face 14 is stoped after the stoping of the second working face 12 is completed, a plurality of hydraulic pressure relief fractures 40 are formed in the basic roof structure of the coal seam, and the directional hydraulic pressure cutting and pressure relief technology is implemented. Then the fourth working face 14 is stoped, the second support body 32 is formed by filling the gangue concrete in the second roadway 22 in the process of stoping the fourth working face 14, the top surface of the second support body 32 is in abutment with the roof of the second roadway 22, the gangue is filled in the goaf formed by the fourth working face 14 after the fourth working face 14 is mined, one side of the second support body 32 is in abutment with the gangue, and the other side is in abutment with the coal body 100, thereby forming a lateral limiting structure and enhancing the stability of the second roadway 22.

[0040] Further, two roadways are continuously excavated in the working face adjacent to the second roadway 22, the roof in the roadway is fractured for long distance hydraulic pressure cutting and pressure relief again according to the above steps, the gangue concrete is filled in the roadway, and the coal body is mined by repeating the operation, so that the coal pillar is not required, and the coal recovery rate is improved.

[0041] Further, in the embodiment of the present application, the step of excavating the second roadway 22 and the third roadway 23 at the third working face 13 adjacent to the first support body 31 further comprises: the second roadway 22 is excavated in the third working face 13 while the roof in the first roadway 21 is fractured along the length direction of the first roadway 21.

[0042] Specifically, the second roadway 22 is excavated in the third working face 13 while the roof in the first roadway 21 is fractured for hydraulic pressure cutting and pressure relief, and the coal body between the second roadway 22 and the first roadway 21 forms the fourth working face 14.

[0043] Further, after the end of the mining of the second working face 12, 3-5 months are waited for, so that the overburden strata migration is stable, and the third roadway 23 is excavated along the first support body 31 in the fourth working face 14, like Figure 3 As shown, one side of the third roadway 23 is adjacent to the first support body 31, and the other side of the third roadway 23 is in abutment with the coal body 100.

[0044] In the embodiment of the present application, in the process of mining the second working face 12, the step of filling the gangue concrete in the first roadway 21 to form the first support body 31 further comprises: filling the gangue concrete from both ends to the middle along the length direction of the first roadway 21 to form the first support body 31.

[0045] Specifically, as shown in Figure 5 and Figure 6 In the process of mining the second working face 12, the bag 51 is hung behind the hydraulic support 50, and the gangue concrete is filled behind the bag 51 in the advancing direction of mining to form the first structure 311, and the width of the first structure 311 is 3-5m in the embodiment. At the same time, the gangue concrete is filled in front of the hydraulic support 50 to form the second structure 312, and the width of the second structure 312 is the same as the width of the first roadway 21, and as the mining work of the second working face 12 continuously advances, the first structure 311 and the second structure 312 are overlapped and solidified to form the first support body 31.

[0046] In the embodiment of the present application, the method for arranging the rock burst roadway further comprises the following step: performing the anchor support in the third roadway 23.

[0047] Specifically, as shown in Figure 9 Due to the different rock mass structures of the left and right sides of the third roadway 23, the differential support technology can be used, and taking the anchor support as an example, since the side of the third roadway 23 adjacent to the fourth working face 14 has a poor support strength after the fourth working face 14 is mined, the first anchor 61 can be used for support, and the first anchor 61 can be made of a material with high strength. Since the side of the third roadway 23 adjacent to the first support body 31 has strong bearing characteristics and strong compression capacity due to the existence of the first support body 31, the second anchor 62 with low strength can be used for support, and the strength of the second anchor 62 is less than that of the first anchor 61. Further, the top of the third roadway 23 can be supported by the anchor cable 63.

[0048] Further, in the embodiment of the present application, the method for arranging the rock burst roadway further comprises the following step: after the end of the mining of each working face, the gangue is filled into the mined-out area formed by each working face, so that the two sides of the first support body 31 are in abutment with the gangue.

[0049] Specifically, as shown in Figure 3 and Figure 8 After the first working face 11 and the second working face 12 are mined, gangue is backfilled into the goaf formed by the first working face 11 and the goaf formed by the second working face 12, which not only avoids the cost problem caused by the gangue hoisting and processing in the underground, but also supports the roof of the goaf and prevents the ground from subsiding.

[0050] The method for arranging the rock burst roadway provided by the embodiment of the present application overcomes the problems of resource waste caused by leaving large coal pillars and other geological disasters caused by not leaving coal pillars in the prior art, and proposes a rock burst roadway unloading-remaining-filling-mining-supporting arrangement method. In the method, a support body is formed by filling gangue concrete in the roadway, the support body simultaneously realizes strong support of the roof and resource recycling of the gangue in the underground, and the recovery rate of the coal pillar can be improved. In order to improve the stress environment of the support body, regional long-distance directional drilling hydraulic fracturing is used to realize roof cutting and pressure relief. New mining of the roadway along the edge of the support body is within the strong support range of the coal pillar, and a differentiated support method is used to realize the stability control of the surrounding rock of the newly-mined roadway.

[0051] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part 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 method of rockburst alleyway arrangement, characterized by, The method comprises the following steps: fracturing the roof in the first roadway along the length direction of the first roadway after the first working face is mined; filling gangue concrete in the first roadway to form a first support body during mining of the second working face, the length of the first support body being the same as the length of the first roadway, and the top surface of the first support body abutting against the roof of the first roadway; driving a second roadway and a third roadway in a third working face adjacent to the first support body, the third roadway being adjacent to the first support body, and the working face between the second roadway and the third roadway being a fourth working face; fracturing the roof in the second roadway along the length direction of the second roadway after the second working face is mined; filling gangue concrete in the second roadway to form a second support body during mining of the fourth working face, the length of the second support body being the same as the length of the second roadway, and the top surface of the second support body abutting against the roof of the second roadway; repeating the above steps in sequence; the step of driving the second roadway and the third roadway in the third working face adjacent to the first support body further comprises: driving the second roadway in the third working face while fracturing the roof in the first roadway along the length direction of the first roadway; the step of driving the second roadway and the third roadway in the third working face adjacent to the first support body further comprises: driving the third roadway in the fourth working face after the second working face is mined.

2. The method of rock burst alleyway arrangement according to claim 1, characterized in that, the step of filling gangue concrete in the first roadway to form a first support body during mining of the second working face further comprises: filling gangue concrete in the first roadway from both ends to the middle along the length direction of the first roadway to form the first support body.

3. The method of rock burst alleyway arrangement according to claim 1, characterized by, the step of filling gangue concrete in the first roadway from both ends to the middle along the length direction of the first roadway to form the first support body further comprises: filling gangue concrete to form a first structure behind the hydraulic support and a second structure in front of the hydraulic support along the advancing direction of mining during mining of the second working face, the width of the second structure being the same as the width of the first roadway; the first structure and the second structure overlap to form the first support body.

4. The method of rock burst alleyway arrangement according to claim 1, characterized by, The method further comprises: performing anchor rod support in the third roadway.

5. The method of rock burst roadway arrangement according to claim 4, characterized in that, the step of performing anchor rod support in the third roadway further comprises: using a first anchor rod to support on the side of the third roadway adjacent to the fourth working face and using a second anchor rod to support on the side of the third roadway adjacent to the first support body, wherein the strength of the first anchor rod is greater than the strength of the second anchor rod.

6. The method of rock burst alleyway arrangement according to claim 5, characterized by, the step of performing anchor rod support in the third roadway further comprises: performing anchor rod and cable support on the top of the third roadway.

7. The method of rock burst alleyway arrangement according to claim 1, characterized by, The method further comprises: After the end of the mining of each working face, gangue is filled into the mined-out area formed by each working face, so that the two sides of the first support body are in abutment with the gangue.

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