CN110030013B - Gob-side entry retaining method for three-seam periodic roof cutting self-entry side of transition support area - Google Patents
Gob-side entry retaining method for three-seam periodic roof cutting self-entry side of transition support area Download PDFInfo
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- CN110030013B CN110030013B CN201910274009.4A CN201910274009A CN110030013B CN 110030013 B CN110030013 B CN 110030013B CN 201910274009 A CN201910274009 A CN 201910274009A CN 110030013 B CN110030013 B CN 110030013B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/14—Layout of tunnels or galleries; Constructional features of tunnels or galleries, not otherwise provided for, e.g. portals, day-light attenuation at tunnel openings
Abstract
The invention provides a gob-side entry retaining method for a three-seam periodic roof cutting self-entry side in a transition support area, which relates to the technical field of mining engineering and comprises the following steps: A. using an anchor rod and an anchor rope to strengthen and support a roadway of the gob-side entry retaining, and arranging a single hydraulic prop beside the roadway; B. arranging an inside trend roof cutting line at the advanced position of the roadway working surface of the gob-side entry retaining; C. additionally arranging an anchor rod and an anchor cable along with the stoping of the working face, and arranging an outer side trend top cutting line; D. calculating the maximum top suspension distance of the combined rock beam, determining a top cutting step distance, wherein the top cutting step distance is smaller than the maximum top suspension distance, and arranging a top cutting inclined line every time the working face advances by a distance exceeding the top cutting step distance; E. the combined rock beam falls to form a roadway side and a gap between the roadway side and a roadway top plate is blocked; F. and D, repeating the steps B to E along with the advance of the working face, and withdrawing the single hydraulic prop after the surrounding rock of the roadway is stable to finish the gob-side entry retaining. The method solves the technical problem that the gob-side entry retaining of the thin coal seam is difficult to block the gangue, and has the advantages of complete lane sides, small surrounding rock deformation and the like.
Description
Technical Field
The invention relates to the technical field of mining engineering, in particular to a gob-side entry retaining method for reinforcing direct roof periodic dropping of a self-entry side by three-line roof cutting in a support area of a transition support.
Background
Along with the increase of mining depth, a mining method for mining the longwall coal pillars brings a series of problems, such as large roadway excavation amount, tension in mining and replacement, waste of coal resources caused by the coal pillars left, dynamic disasters caused by stress concentration of the coal pillars and the like. The problems can be effectively solved through the gob-side entry retaining mining technology, but the existing traditional gob-side entry retaining supports the top plate through roadside filling or wall building, the system is complex, the process is complex, and a roadside filling body or a wall body is difficult to adapt to roadway surrounding rock deformation and is easy to damage.
In the implementation process of the existing roof-cutting and roadway-forming process, as roof cutting is carried out by methods such as roadside blasting or hydraulic fracturing, after roof cutting, a roof is supported by using anchor rods and anchor cables inside a roadway and a single hydraulic prop, and roadside fillers or walling methods are removed, and a method for retaining waste rock to form the roadway is also provided. In addition, the method is difficult in waste rock blocking, anchor rod anchoring and waste rock grouting sealing are additionally required, the workload is high, air leakage is easy to occur after the roadway is formed, the safety production of the next working face is influenced, and therefore the existing gob-side entry retaining technology needs to be further improved.
Disclosure of Invention
In order to solve the technical problems of difficult waste rock blocking and complex construction in the existing gob-side entry retaining process, the invention provides a gob-side entry retaining method for a three-seam periodic roof cutting self-entry-forming side in a transition support area, and the specific technical scheme is as follows.
A gob-side entry retaining method for a transition support area three-seam periodic roof cutting self-entry side comprises the following steps:
A. the roadway of the gob-side entry retaining is supported by using an anchor rod and an anchor rope in an enhanced manner, and a single hydraulic prop is arranged beside the roadway;
B. arranging an inside trend top-cutting line at the advanced position of a working face in a roadway of the gob-side entry retaining;
C. arranging an outer side trend top cutting line in a transition support area behind the working face, forming a top cutting area between the inner side trend top cutting line and the outer side trend top cutting line, and additionally arranging an anchor rod and an anchor cable in the top cutting area along with the stoping of the working face;
D. calculating the maximum top suspension distance of the combined rock beam, determining a top cutting step distance, wherein the top cutting step distance is smaller than the maximum top suspension distance, and arranging a top cutting inclined line every time the working face advances by a distance exceeding the top cutting step distance;
E. the combined rock beam falls to form a roadway side and a gap between the roadway side and a roadway top plate is blocked;
F. and D, repeating the steps B to E along with the advance of the working face, and withdrawing the single hydraulic prop after the surrounding rock of the roadway is stable to finish the gob-side entry retaining.
Preferably, the inside strike-out line is arranged in a roadway of the gob-side entry retaining, and the inside strike-out line is arranged in the roadway of the gob-side entry retainingThe top cutting line runs through the direct roof from the roadway to the basic roof; the depth of the inner side strike top cutting line is greater than the thickness M of the direct topZThe thickness of the direct roof is as follows:
wherein h isaFor mining height, saAnd k is the actual settlement value of the rock beam, and k is the crushing and expansion coefficient of the collapsed rock stratum at the lower part of the rock beam.
Preferably, the thickness of the outer side heading roof cutting line penetrating through the overburden from the working face top plate is greater than the height h of the roadway, and the thickness of each layer penetrating through the overburden from bottom to top is c1、c2、c3···cnAnd the topping depth of the topping line in the outer side trend is H according to a formula: h>c1+c2+c3+···+cn>h, determining the top cutting depth of the outer side trend top cutting line.
Further preferably, the roof cutting depth of the inclined roof cutting line is equal to the roof cutting depth of the outer heading roof cutting line, and the roof cutting bore hole of the inclined roof cutting line is inclined to the goaf side and the inclination angle is less than 5 °.
Further preferably, the outer side trend top cutting line is arranged behind the working face, the inner side trend top cutting line and the outer side trend top cutting line are arranged in parallel, and the distance between the inner side trend top cutting line and the outer side trend top cutting line is 2.5-5 m.
Preferably, a first inclined top cutting line is arranged at the position of the working face cut hole along the roadway of the gob-side entry retaining, and a second inclined top cutting line is arranged at the interval of 2-3 m along with the advancing of the working face.
Preferably, the anchor cable extends through the weak immediate roof and into the hard immediate roof, and the support density is adjusted according to the integrity of the roof strata.
It is also preferable that the gap between the roadway side and the roadway roof is filled and plugged by injecting expanded foam or guniting.
The beneficial effects of the invention include:
(1) the invention provides a gob-side entry retaining method for a three-seam periodic roof cutting self-entry retaining wall in a transition support area.
(2) The method also has the advantages that the tunneling working surface is reduced, so that the problem of tension in mining continuation is relieved, the waste of coal resources can be reduced without remaining coal pillars, the stress concentration of the coal pillars is prevented, and the outburst danger of coal and gas is avoided; according to the method, roadside filling and wall building waste rock blocking are not needed, and roof cutting is only needed to be carried out in the transition support area, so that the construction space of the retained roadway is enlarged, and the influence of retained roadway construction on working face extraction is small.
(3) According to the gob-side entry retaining method, the direct roof is cut off through the three roof cutting lines to form the lane side, stress transfer of the roof plate is cut off after roof cutting, goaf suspended roof is effectively avoided, the stress environment of the gob-side entry retaining is improved, the confining pressure of gob-side entry retaining surrounding rock is reduced, and the deformation of the gob-side entry retaining surrounding rock is effectively controlled; in addition, the invention has the advantages of simple process, high construction efficiency and the like.
Drawings
FIG. 1 is a schematic flow diagram of a method of gob-side entry retaining;
FIG. 2 is a schematic view of a gob-side entry retaining face and lane layout;
3 FIG. 3 3 3 is 3 a 3 schematic 3 cross 3- 3 sectional 3 view 3 A 3- 3 A 3 of 3 FIG. 3 2 3; 3
FIG. 4 is a schematic cross-sectional view B-B of FIG. 2;
FIG. 5 is a schematic view of a position of a top-cutting line arrangement;
fig. 6 is a schematic view of a modified arrangement of the top-cutting lines.
In the figure: 1-inner side trend top cutting line; 2-the outer side trend is towards the top cutting line; 3-tendency to crop the top line; 4-cutting the eyes; 5-anchor rod; 6, anchor cables; 7-immediate roof; 8-a basic roof; 9-a goaf; 10-transition scaffold.
Detailed Description
Referring to fig. 1 to 6, the embodiment of the gob-side entry retaining method for the transition support area with three-seam periodic roof cutting and self-entry forming side provided by the invention is as follows.
Example 1
A gob-side entry retaining method for a transition support area three-seam periodic roof cutting self-entry side comprises the following specific construction steps:
and step A, reinforcing support of a roadway of the gob-side entry retaining by using an anchor rod 5 and an anchor cable 6, arranging a single hydraulic support beside the roadway for temporary support, and conveniently constructing on a top plate by using a special support for the hydraulic support.
And step B, arranging an inner side trend top cutting line 1 in a roadway of the gob-side entry retaining, at the advanced position of the working face and in a transition support area of the working face, constructing in the roadway, arranging the top cutting line in advance of the working face, and mainly setting a top cutting drill hole.
The inner side trend top cutting line 1 is arranged in a roadway of the gob-side entry retaining, the inner side trend top cutting line 1 penetrates through a direct roof 7 from the roadway and reaches a basic roof 8, the inner side trend top cutting line 1 can incline to one side of a working face by a certain angle, and the inclination angle is smaller than 5 degrees. In addition, the depth of the inner side strike top cutting line 1 is larger than the thickness M of the direct roofZThe thickness of the direct roof 7 is as follows:
wherein h isaFor mining height, saThe actual settlement value of the rock beam is determined, k is the broken expansion coefficient of the collapsed rock stratum at the lower part of the rock beam, and the thickness of the direct roof is determined by calculation according to drilling data, specific construction drilling data and actual mining conditions.
And step C, arranging an outer side trend top cutting line 2 at the rear of the working face, arranging the outer side trend top cutting line 2 in the transition support top control area, and forming a top cutting area between the inner side trend top cutting line 1 and the outer side trend top cutting line 2. The top cutting area is fixed through an anchor rod 5 and an anchor cable 6, a fixed rock stratum forms a combined rock beam, the anchor rod 5 and the anchor cable 6 are additionally arranged in the top cutting area along with the recovery of a working face, the anchor rod 5 and the anchor cable 6 begin to be constructed under a transition support of the working face, and the construction outside moves towards a top cutting line 2 after the working face is pushed.
The thickness of the outside strike roof cutting line 2 penetrating the overburden from the working face top plate is greater than the height h of the roadway, and the thickness of each layer penetrating the overburden from bottom to top is c1、c2、c3···cnAnd the topping depth of the topping line in the outer side trend is H according to a formula: h>c1+c2+c3+···+cn>h, determining the top cutting depth of the outer side trend top cutting line 2, and constructing top cutting drilling holes according to the top cutting depth.
The outer side trend top cutting line 2 is arranged behind the working face, the inner side trend top cutting line 1 and the outer side trend top cutting line 2 are arranged in parallel, the distance between the inner side trend top cutting line 1 and the outer side trend top cutting line 2 is 2-3 hydraulic supports, and the width of each hydraulic support is about 2.5-5 m.
Constructing below the transition support 10, wherein the arranged anchor cables penetrate through the soft immediate roof and extend into the hard immediate roof, so that the immediate roof 7 is ensured to form a relatively complete combined rock beam, thereby forming a complete roadway side, adjusting the support density of the anchor rods and the anchor cables according to the integrity of a roof rock stratum, and increasing the support density when the roof lithology is poor, the number of layers is large or cracks develop; when the roof lithology is better, the layering is few and the roof is complete, reduce the support density of stock anchor rope.
In addition, as shown in fig. 6, the inclined top cutting line is a broken line, and the friction force is gradually increased along with the decrease of the inner angle of the broken line, so that the included angle of the broken line can be adjusted according to the actual construction condition, the falling speed of the top plate is controlled, and the arrangement mode of the top cutting line is improved, so that the contact area after top cutting is increased, and the falling speed of the top cutting is reduced.
And D, calculating the maximum suspension distance of the combined rock beam, and determining the crest-cutting step distance, wherein the specific maximum suspension distance can be determined by calculation according to mining data, can also be determined according to the actual measurement condition of a connected working face, and can also be determined by theoretical calculation according to roof rock stratum distribution and lithology. A first inclined top cutting line is arranged at the position of a working face cutting hole 4 of a roadway of the gob-side entry retaining, and a second inclined top cutting line is arranged at the interval of 2-3 m along with the advancing of the working face. The top cutting step distance is smaller than the maximum suspended top distance, a dip top cutting line is arranged at the distance when the working face is pushed to exceed the top cutting step distance, and the concrete condition is adjusted according to the construction in the pushing process of the working face.
The top cutting depth of the inclined top cutting line 3 is equal to that of the top cutting line 2 in the outer side direction, the top cutting drill hole of the inclined top cutting line 3 inclines towards one side of the gob 9, the inclination angle is smaller than 5 degrees, and the combined rock beam is guaranteed to fall smoothly integrally.
The roof cutting area is formed by arranging the parallel inner side trend roof cutting line and the outer side trend roof cutting line, the trend roof cutting line is arranged in the roof cutting area, the direct roof is cut and falls to one side of the roadway of the gob-side entry retaining to form a roadway side, and the roof cutting area is provided with the anchor rod and the anchor rope in advance, so that the roof cutting part of the roadway is complete, a large amount of gangue is prevented from entering the roadway, and the procedures of blocking the gangue and the like are saved.
And E, performing hydraulic fracturing or directional energy-gathered blasting on the inclined top-cutting line 3, the inner side heading top-cutting line 1 and the outer side heading top-cutting line 2 to complete top cutting, so that the combined rock beam falls to form a roadway side and a gap between the roadway side and a roadway top plate is plugged. The gap between the roadway side and the roadway top plate is filled and plugged by injecting expanded foam or guniting, and the construction of plugging the gap is convenient because the roadway side is integral and only the gap exists between the upper part of the roadway side or the combined rock beam block.
The roadway wall is formed by cutting off part of the direct roof 7 through the three roof cutting lines, stress transfer of the roof plate is cut off after roof cutting, goaf roof suspension is effectively avoided, the stress environment of the gob-side entry retaining is improved, the confining pressure of gob-side entry retaining surrounding rock is reduced, and the deformation of the gob-side entry retaining surrounding rock is effectively controlled.
And F, advancing along the working face, repeating the steps B to E, cutting tops section by section along the working face, closely arranging cuboid-like rock blocks formed by the combined rock beams after the tops are cut at the roadside to form a roadway side, and withdrawing the single hydraulic prop after the surrounding rock of the roadway is stabilized to finish gob-side entry retaining.
The method also has the advantages that the tunneling working surface is reduced, so that the problem of tension in mining continuation is relieved, the waste of coal resources can be reduced without remaining coal pillars, the stress concentration of the coal pillars is prevented, and the outburst danger of coal and gas is avoided; according to the method, roadside filling and wall building waste rock blocking are not needed, and roof cutting is only needed to be carried out in the transition support area, so that the construction space of the retained roadway is enlarged, and the influence of retained roadway construction on working face extraction is small. In addition, the invention has the advantages of simple process, high construction efficiency and the like.
Example 2
In order to further explain the construction process of the gob-side entry retaining method for the transition support area three-seam periodic roof cutting direct roof entry, the invention is further explained in detail by taking a certain mine 1201 working surface and a certain mine 1202 working surface as examples.
The 1201 working face and the 1202 working face of the mine are adjacent, 2 coals are mainly mined, the thickness of the coal seam is 3.2m on average, the position of the coal seam is stable, and the thickness change is small. The top plate rock stratum is sand mudstone with the average thickness of about 0.8m from bottom to top in sequence; the average thickness of the fine sandstone is about 2.8 m; the siltstone has an average thickness of about 7 m. And (4) tunneling the stoping roadway along the bottom, wherein the section of the stoping roadway is rectangular, and the stoping roadway is reserved between the two working faces by adopting a gob-side entry retaining method.
The concrete construction steps of the gob-side entry retaining by the method provided by the invention comprise:
a, reinforcing support of a roadway of a gob-side entry retaining by using anchor rods 5 and anchor cables 6, wherein the pitch of the anchor rods 5 is 1 x 1m, the pitch of the anchor cables 6 with the length of 1.5m is 2 x 2m, and the length of the anchor cables 6 is 4 m; and single hydraulic props are arranged at intervals of 0.5m beside the roadway for temporary supporting, and the hydraulic props are convenient to construct on the top plate by adopting special supports.
And B, arranging an inner side trend roof cutting line at the advanced position of the working face in the roadway of the gob-side entry retaining, constructing the roof cutting line which can advance the working face by 50-100 m in the roadway, and mainly arranging a roof cutting drill hole to facilitate roof cutting through blasting or hydraulic fracturing.
The inner side trend top cutting line 1 is arranged on the inner side of a roadway of the gob-side entry retaining, the inner side trend top cutting line 1 penetrates through a direct roof from the roadway to reach a basic roof 7, the inner side trend top cutting line 1 can be inclined to one side of a working face by a certain angle, and the inclination angle is smaller than about 4 degrees. The depth of the inner side heading topping line 1 is 3.6m greater than the thickness of the immediate roof 7, and the depth of the topping borehole provided in the mine is 6 m.
And C, arranging an outer side trend top cutting line behind the working surface, and forming a top cutting area between the inner side trend top cutting line 1 and the outer side trend top cutting line 2. The roof cutting area is fixed through an anchor rod and an anchor cable, a fixed rock stratum forms a combined rock beam, the anchor rod 5 and the anchor cable 6 are additionally arranged in the roof cutting area along with the recovery of a working face, the anchor rod and the anchor cable begin to be constructed under the working face transition support, and the outer side of the construction after the working face is pushed moves towards a roof cutting line.
The thickness that the roof line 2 was gone to in the outside runs through the overburden from the working face roof is greater than the height 3.2m in tunnel, and the thickness that runs through the overburden is 0.8m +2.8m 3.6m, and the roof depth of cut that the roof line was gone to in the outside is H, according to the formula: h is more than 3.6m and more than 3.2m, the top cutting depth of the outer side trend top cutting line is determined, and a top cutting drill hole is constructed for 3.8m according to the top cutting depth.
The outside trend is arranged at the working face rear to cutting the top line 2, and inboard trend is cut top line 1 and outside trend and is cut top line 2 parallel arrangement, 3 hydraulic support of distance between inboard trend cutting the top line 1 and the outside trend cutting the top line 2, and the width is about 4.5 m.
And constructing below the transition support 10, wherein the arranged anchor cables penetrate through the soft direct roof and extend into the hard direct roof to ensure that the direct roof forms a relatively complete combined rock beam so as to form a complete roadway side, and the arrangement distance of the anchor rods is set to be 0.8 multiplied by 0.8m according to the actual condition of the roadway, the length of the anchor rods is 1.8m, the arrangement distance of the anchor cables is 1.6 multiplied by 1.6m, and the length of the anchor cables is 3.2 m.
And D, calculating the maximum suspension distance of the combined rock beam, determining that the roof cutting step distance is 3.6-5 m according to the maximum suspension distance, arranging a first inclined roof cutting line at the position of a working face hole 4 along the roadway of the gob-side entry retaining, and arranging a second inclined roof cutting line at the interval of 2.5m along the advancing of the working face. The top cutting step distance is smaller than the maximum suspended top distance, a dip top cutting line is arranged at the distance when the working face is pushed to exceed the top cutting step distance, and the concrete condition is adjusted according to the construction in the pushing process of the working face.
The top cutting depth of the inclined top cutting line 3 is equal to the top cutting depth of the top cutting line on the outer side, the top cutting drill hole of the inclined top cutting line 3 inclines to one side of the gob 9, the inclination angle is 4 degrees, and the combined rock beam is guaranteed to fall smoothly integrally.
And E, performing hydraulic fracturing or directional energy-gathered blasting on the inclined top-cutting line 3, the inner side heading top-cutting line 1 and the outer side heading top-cutting line 2 to complete top cutting, so that the combined rock beam falls to form a roadway side and a gap between the roadway side and a roadway top plate is plugged. The gap between the roadway side and the roadway top plate is filled and plugged by injecting expanded foam, and the plugging construction of the gap is convenient because the roadway side is complete and only the gap exists between the upper part of the roadway side or the combined rock beam block.
And F, the steps B to E are repeated along with the advance of the working face, the roof is cut section by section along the working face, cuboid-like rock blocks formed by the combined rock beams after the roof is cut are closely arranged beside the roadway to form a roadway side, the single hydraulic prop is removed after the surrounding rock of the roadway is stable, the gob-side entry retaining is completed, the construction is simple, and the gangue blocking treatment is not needed.
According to monitoring that the roadway gate-way surrounding rock deformation is serious on the working face at the position of the mine where roof cutting and pressure relief are not adopted, the roadway surrounding rock deformation in the roadway gate-way at the position of the working face where roof cutting and roadway forming are adopted is small, the stress concentration of coal pillars is avoided, the ore pressure is not obvious, and the quantity of gangue in the roadway is small, so that the gob-side entry retaining method provided by the invention has a better effect.
In addition, the method has better application effect under the mining conditions of a thin coal seam with the thickness of 0.8-1.3 m, a medium-hard roof and a roof above, and the roof cutting in the thin coal seam is found in the application example of the thin coal seam, so that the integrity and the continuity of the roof can be better ensured, local materials are obtained, and the cost of roadway formation is reduced.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (6)
1. A gob-side entry retaining method for a transition support area three-seam periodic roof cutting self-entry side is characterized by comprising the following steps:
A. the roadway of the gob-side entry retaining is supported by using an anchor rod and an anchor rope in an enhanced manner, and a single hydraulic prop is arranged beside the roadway; the anchor cable penetrates through the soft immediate roof and extends into the hard immediate roof, and the support density is adjusted according to the integrity of the roof rock stratum;
B. arranging an inside trend top-cutting line at the advanced position of a working face in a roadway of the gob-side entry retaining; the inner side trend top cutting line penetrates through the direct roof from the roadway to the basic roof;
C. arranging an outer side trend top cutting line in a transition support area behind the working face, forming a top cutting area between the inner side trend top cutting line and the outer side trend top cutting line, and additionally arranging an anchor rod and an anchor cable in the top cutting area along with the stoping of the working face;
D. calculating the maximum top suspension distance of the combined rock beam, determining a top cutting step distance, wherein the top cutting step distance is smaller than the maximum top suspension distance, and arranging a top cutting inclined line every time the working face advances by a distance exceeding the top cutting step distance; the thickness of the outside strike roof cutting line penetrating through the overburden from the working face top plate is greater than the height h of the roadway, and the thickness of each layer penetrating through the overburden from bottom to top is c1、c2、c3···cnAnd the topping depth of the topping line in the outer side trend is H according to a formula: h>c1+c2+c3+···+cn>h, determining the topping depth of the outer side trend topping line; the top cutting depth of the inclined top cutting line is equal to the top cutting depth of the outer side trend top cutting line;
E. the combined rock beam completely falls to form a roadway side and a gap between the roadway side and a roadway top plate is blocked;
F. and D, repeating the steps B to E along with the advance of the working face, and withdrawing the single hydraulic prop after the surrounding rock of the roadway is stable to finish the gob-side entry retaining.
2. The gob-side entry retaining method for three-seam periodic roof cutting self-entry side of transition support area according to claim 1, wherein the depth of the inside-going roof cutting line is greater than the direct roof thickness MZThe thickness of the direct roof is as follows:
wherein h isaFor mining height, saAnd k is the actual settlement value of the rock beam, and k is the crushing and expansion coefficient of the collapsed rock stratum at the lower part of the rock beam.
3. The gob-side entry retaining method for three-seam periodic roof cutting self-entry side in a transition support area according to claim 1, wherein the roof cutting drill hole inclined to the roof cutting line is inclined to one side of the gob by an angle smaller than 5 °.
4. The gob-side entry retaining method for the transition support area three-seam periodic roof cutting self-entry side according to any one of claims 1 to 3, wherein the outside-oriented roof cutting line is arranged behind the working face, the inside-oriented roof cutting line and the outside-oriented roof cutting line are arranged in parallel, and the distance between the inside-oriented roof cutting line and the outside-oriented roof cutting line is 2.5-5 m.
5. The gob-side entry retaining method for the transition support area three-seam periodic roof cutting self-entry side according to claim 1, wherein the entry of the gob-side entry retaining is provided with a first inclined roof cutting line at a working face cut-off position, and a second inclined roof cutting line is arranged along with the advancing interval of the working face of 2-3 m.
6. The gob-side entry retaining method for the transition support area with the three-seam periodic roof cutting self-entry side according to claim 1, wherein the seam between the entry side and the top plate of the roadway is filled and blocked by injecting expanded foam or slurry.
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| CN201910274009.4A CN110030013B (en) | 2019-04-08 | 2019-04-08 | Gob-side entry retaining method for three-seam periodic roof cutting self-entry side of transition support area |
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| CN201910274009.4A CN110030013B (en) | 2019-04-08 | 2019-04-08 | Gob-side entry retaining method for three-seam periodic roof cutting self-entry side of transition support area |
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| CN111577283B (en) * | 2020-06-20 | 2022-02-01 | 重庆大学 | Non-coal-pillar roadway retaining method based on mechanical cutting and composite blasting |
| CN112922598A (en) * | 2021-03-23 | 2021-06-08 | 中矿科创(北京)煤炭技术有限公司 | Method for reducing gob-side entry driving roof pressure through roof cutting and pressure relief |
| CN113216951B (en) * | 2021-06-03 | 2021-12-14 | 中南大学 | Non-explosive mechanical mining method for deep hard rock mine |
| CN115898261B (en) * | 2022-10-14 | 2023-08-15 | 中国矿业大学 | Gob-side entry retaining low-level roof cutting and high-level directional fracturing stress transfer method and equipment |
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| CN103397905A (en) * | 2013-04-17 | 2013-11-20 | 唐建新 | System and method for achieving natural striding, falling and filling of coal beds, flexible roadway protection and complete gob-side entry retaining |
| CN106121537B (en) * | 2016-07-22 | 2018-06-19 | 山东科技大学 | Without coal column gob side entry retaining Qie Dingcheng lanes construction method |
| CN108194088B (en) * | 2017-12-28 | 2019-03-19 | 西安科技大学 | A kind of soft top coal layer cuts top release gob-side entry retaining method without explosion |
| CN108643907B (en) * | 2018-05-11 | 2020-02-25 | 山东科技大学 | Non-pillar mining method for broken direct roof caving roadway |
| CN108678769B (en) * | 2018-05-16 | 2020-03-06 | 山东科技大学 | Anchor grouting and roof cutting main control entry retaining method for deep mining tunnel |
| CN208364123U (en) * | 2018-06-28 | 2019-01-11 | 山西霍尔辛赫煤业有限责任公司 | One kind stays top coal drift gob side entry retaining to cut top release shield lane structure |
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