CN117167022A - Construction method for grouting control gob-side entry retaining stope roof - Google Patents
Construction method for grouting control gob-side entry retaining stope roof Download PDFInfo
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- CN117167022A CN117167022A CN202310968330.9A CN202310968330A CN117167022A CN 117167022 A CN117167022 A CN 117167022A CN 202310968330 A CN202310968330 A CN 202310968330A CN 117167022 A CN117167022 A CN 117167022A
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- 238000010276 construction Methods 0.000 title claims abstract description 32
- 238000005553 drilling Methods 0.000 claims abstract description 113
- 239000011435 rock Substances 0.000 claims abstract description 86
- 230000035515 penetration Effects 0.000 claims abstract description 8
- 239000003245 coal Substances 0.000 claims description 23
- 230000015572 biosynthetic process Effects 0.000 claims description 13
- 238000005452 bending Methods 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 11
- 238000000926 separation method Methods 0.000 claims description 8
- 239000002002 slurry Substances 0.000 claims description 7
- 239000004568 cement Substances 0.000 claims description 5
- 238000005065 mining Methods 0.000 claims description 4
- 238000003776 cleavage reaction Methods 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 230000007017 scission Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 5
- 238000005755 formation reaction Methods 0.000 description 12
- 230000032798 delamination Effects 0.000 description 6
- 239000000843 powder Substances 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 239000009719 polyimide resin Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The application provides a construction method for controlling a roof of a gob-side entry retaining stope by grouting, which comprises the following steps: step 1, lancing is carried out on a top plate of a retaining roadway from the interior of the roadway; step 2, drilling holes in the roadway in surrounding rock obliquely upwards, and continuously performing gas drainage through the holes in the roadway; the in-lane drilling holes comprise a plurality of in-lane low-position drilling holes and a plurality of in-lane high-position drilling holes; step 3, after the working face is adopted, stopping gas drainage in the roadway drilling holes, filling and grouting through the low-level drilling holes in the roadway, and performing penetration and splitting grouting through the high-level drilling holes in the roadway; step 4, after the working face is adopted, the top plate of the goaf begins to collapse, and at the moment, the ground surface is drilled downwards to drill holes in the ground surface and grouting is carried out; the surface boreholes comprise surface high-level boreholes and surface low-level boreholes. The construction method can effectively control deformation of the overlying strata of the goaf under the condition that the roof cutting effect is not ideal.
Description
Technical Field
The application belongs to the technical field of roof cutting pressure relief gob-side entry retaining, and particularly relates to a construction method for controlling roof of a roof cutting roof gob-side entry retaining stope by grouting.
Background
The mine in China has more 'three-lower' coal pressing, the mining of the 'three-lower' coal body has strict requirements on the subsidence amount of the earth surface, if the roof cutting pressure relief roadway has unsatisfactory roof cutting effect, namely, the goaf roof is not fully collapsed, the collapsed gangue does not realize complete filling of the goaf, the goaf roof is deformed under the action of the overburden rock pressure, and a 'two-zone one-zone two-interface' is formed above the goaf, so that the earth surface subsidence exceeds the allowable range, the earth surface building and the railway are extremely easy to damage, and the underground water penetration accident occurs.
The roof cutting pressure relief gob-side entry retaining technology achieves the aim of cutting off the stress transmission of a roadway roof by pre-splitting and slitting the roadway roof, further can keep the roadway for stoping of a next working face along a goaf, can enable the goaf roof to collapse better, enables filling of the goaf by utilizing the crushing expansion of collapsed gangue to be more sufficient, and accordingly reduces subsidence of the ground surface, but cannot guarantee roof cutting effect in the actual construction process, and how to control the roof of the gob-side roof cutting gob-side entry retaining stope under the condition that the roof cutting effect is not ideal is still a problem to be solved.
Accordingly, there is a need to provide an improved solution to the above-mentioned deficiencies of the prior art.
Disclosure of Invention
The application aims to provide a construction method for controlling a roof of a gob-side entry retaining stope by grouting so as to at least solve the problems in the prior art.
In order to achieve the above object, the present application provides the following technical solutions:
a grouting control gob-side entry retaining stope roof construction method includes the steps that a first rock stratum, a second rock stratum, a third rock stratum, a fourth rock stratum, a fifth rock stratum, a sixth rock stratum and a seventh rock stratum are sequentially arranged above a coal bed from bottom to top;
the construction method comprises the following steps:
step 1, two tunnels are excavated in a coal seam, the medium of the middle part of the two tunnels is a working surface of a section, and a roof of a retaining tunnel is cut from the inside of the tunnel;
step 2, after deformation of the cut surrounding rock is stable, drilling holes in the surrounding rock in the roadway obliquely upwards, and continuously pumping gas through the holes in the roadway;
the in-lane drilling comprises a plurality of in-lane low-level drilling holes and a plurality of in-lane high-level drilling holes, and the depth of the in-lane high-level drilling holes is larger than that of the in-lane low-level drilling holes;
step 3, after the working face is adopted, stopping gas drainage in the roadway drilling holes, filling and grouting through the low-level drilling holes in the roadway, and performing penetration and splitting grouting through the high-level drilling holes in the roadway; the grouting pressure of the penetration and cleavage grouting is higher than that of the filling grouting;
step 4, after the working face is adopted, the goaf roof begins to collapse, at the moment, surface drilling holes are drilled downwards from the surface, and grouting is conducted into surrounding rock through the surface drilling holes;
the surface drilling comprises a surface high-level drilling and a surface low-level drilling, and the depth of the low-level drilling is larger than that of the surface high-level drilling.
In the construction method for controlling the roof of the gob-side entry retaining stope by grouting, preferably, after mining of a working face, rock stratum one collapses and goaf broken gangue is formed; the termination positions of the low-level drilling holes in the roadway are junctions of the first rock stratum and the second rock stratum, and the termination positions of the low-level drilling holes in the roadway are uniformly distributed in the width direction of the coal seam.
In the construction method for controlling the roof of the gob-side entry retaining stope by grouting, preferably, after the rock stratum collapses, the rock stratum II and the rock stratum III above the rock stratum I form a fracture zone, and the termination positions of a plurality of in-roadway high-position drilling holes are uniformly distributed in the fracture zone formed by the rock stratum II and the rock stratum III.
In the construction method for controlling the roof of the gob-side entry retaining stope by grouting as described above, preferably, a plurality of in-lane drill holes are drilled in one lane.
In the construction method for controlling the roof of the gob-side entry retaining stope by grouting as described above, preferably, a bending subsidence zone is formed in the fourth and fifth rock layers above the third rock layer, and the termination positions of the plurality of surface low-level boreholes are located inside the bending subsidence zone.
In the construction method for controlling the roof of the gob-side entry retaining stope according to the grouting, preferably, a separation zone is formed between the rock layer five and the rock layer six, and the termination positions of the plurality of surface high-level drilling holes are located in the separation zone.
In the construction method for controlling the roof of the gob-side entry retaining stope as described above, preferably, the grouting liquid used in grouting the in-roadway drilling is Marie.
In the construction method for controlling the roof of the gob-side entry retaining stope, preferably, grouting liquid used in grouting the ground surface low-level drilling is Marie powder;
grouting liquid used in grouting of the surface high-level drilling is cement or slurry.
In the construction method for controlling the roof of the gob-side entry retaining stope according to the above-mentioned grouting, preferably, in step 1, a slit penetrates through the first rock layer above the coal seam, and the slit is inclined toward the central axis direction of the two roadways so as to separate the roof above the coal seam from the roof above the roadway.
According to the construction method for controlling the roof of the gob-side entry retaining stope, preferably, the height of the goaf is in direct proportion to the number of vertical rows of the in-roadway drilling holes, the width of the goaf is in direct proportion to the number of transverse rows of the in-roadway drilling holes, and the width of the goaf is in direct proportion to the number of surface drilling holes.
The beneficial effects are that:
according to the construction method, the in-roadway low-level drilling holes and the in-roadway high-level drilling holes are respectively arranged in the roadway, and grouting is carried out in the surface drilling holes, so that surrounding rock above a goaf can be filled more quickly, the surface subsidence caused by insufficient roof cutting can be reduced, and the problem of gas emission possibly existing before stoping of a working face can be reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. Wherein:
FIG. 1 is a schematic illustration of initial locations of various formations in accordance with one embodiment of the present application;
FIG. 2 is a schematic view of a lancing arrangement according to one embodiment of the present application;
FIG. 3 is a schematic illustration of an intra-roadway borehole according to one embodiment of the present application;
FIG. 4 is a view of deformation of overburden and in-roadway drilling and surface drilling in a goaf in accordance with one embodiment of the present application.
In the figure: 1. rock formation seven, 2, rock formation six, 3, rock formation five, 4, rock formation four, 5, rock formation three, 6, rock formation two, 7, rock formation one, 8, coal seam, 9, kerf, 10, entry roadway 11, non-entry roadway 12, in-roadway high-order borehole one, 13, in-roadway high-order borehole two, 14, in-roadway low-order borehole one, 15, in-roadway low-order borehole two, 16, in-roadway low-order borehole three, 17, surface high-order borehole 18, surface low-order borehole 19, separation zone 20, interface two, 21, interface one.
Detailed Description
The following description of the technical solutions in the embodiments of the present application will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which are derived by a person skilled in the art based on the embodiments of the application, fall within the scope of protection of the application.
In the description of the present application, the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", etc. refer to the orientation or positional relationship based on that shown in the drawings, merely for convenience of description of the present application and do not require that the present application must be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application. The terms "coupled" and "connected" as used herein are to be construed broadly and may be, for example, fixedly coupled or detachably coupled; either directly or indirectly through intermediate components, the specific meaning of the terms being understood by those of ordinary skill in the art as the case may be.
The application will be described in detail below with reference to the drawings in connection with embodiments. It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other.
According to an embodiment of the application, as shown in fig. 1-4, the application provides a construction method of a grouting control gob-side entry retaining stope roof, which sequentially comprises a first stratum 7, a second stratum 6, a third stratum 5, a fourth stratum 4, a fifth stratum 3, a sixth stratum 2 and a seventh stratum 1 from top to bottom above a coal seam 8.
The construction method comprises the following steps:
step 1, two tunnels are excavated in a coal seam 8, the medium of the middle part of the two tunnels is a working surface of one section, and a roof of a retaining tunnel 10 is subjected to lancing 9 from the inside of the tunnel.
And 2, respectively drilling in-roadway holes in the surrounding rock in an inclined way in the roadway after the surrounding rock after the kerf 9 is deformed stably, and continuously pumping gas through the in-roadway holes.
The in-lane drilling comprises a plurality of in-lane low-position drilling holes and a plurality of in-lane high-position drilling holes, and the depth of the in-lane high-position drilling holes is larger than that of the in-lane low-position drilling holes.
Step 3, after the working face is adopted, stopping gas drainage in the roadway drilling holes, filling and grouting through the low-level drilling holes in the roadway, and performing penetration and splitting grouting through the high-level drilling holes in the roadway; the grouting pressure of the penetration and cleavage grouting is higher than that of the filling grouting.
And 4, after the working surface is adopted, the goaf roof begins to collapse, at the moment, the ground surface drill holes are drilled downwards from the ground surface, and grouting is conducted into surrounding rock through the ground surface drill holes.
The surface boreholes include an earth's surface high-order borehole 17 and an earth's surface low-order borehole 18, the depth of which is greater than the depth of the surface high-order borehole 17.
In the construction method, the in-roadway low-position drilling and the in-roadway high-position drilling are respectively arranged in the roadway, so that the continuous gas drainage of the coal seam 8 before the coal seam 8 is exploited is realized, and the exploitation safety of the coal seam 8 is ensured; after the coal seam 8 is mined, gas drainage performed by drilling holes in a roadway is rapidly stopped, grouting is performed in the drilling holes in the roadway, grouting slurry is quick-drying cement, quick solidification of the slurry is facilitated, grouting in surface drilling holes is combined, surrounding rock above a goaf can be filled more rapidly, and subsidence of the surface where the goaf is located is avoided.
After mining of the working face, the first rock stratum 7 collapses and forms goaf broken gangue; the end positions of the low-level drilling holes in the roadway are the junction of the first rock stratum 7 and the second rock stratum 6, and the end positions of the low-level drilling holes in the roadway are uniformly distributed in the width direction of the coal seam 8.
In one embodiment of the application, the first rock layer 7 is the goaf direct roof, the second rock layer 6 is the goaf basic roof, i.e. the end position of the in-lane low-level borehole is located between the goaf direct roof and the goaf basic roof. After the working surface is adopted, the overlying strata of the goaf is gradually deformed, the strata forms goaf broken gangue, fracture zones and bending zones from bottom to top, a first interface 21 exists between the broken gangue and the fracture zones, a second interface 20 exists between the fracture zones and the bending zones, a separation layer zone 19 is formed between the bending zones and the rock layers with smaller upper deformation, and the overlying strata deformation results form a 'two zones one zone two interfaces'.
The in-roadway low-level drilling holes penetrate into the first interface 21 between the goaf broken gangue and the fracture zone, and grouting is carried out through the in-roadway low-level drilling holes, so that a closed isolation surface is formed in the first interface 21, the goaf broken gangue and the fracture zone are separated, further development of the fracture zone after working face exploitation can be avoided, and the fracture zone is well supported.
After the first rock stratum 7 collapses, the second rock stratum 6 and the third rock stratum 5 above the first rock stratum 7 form a fracture zone, and the termination positions of the high-position drilling holes in the multiple roadways are uniformly distributed in the fracture zone formed by the second rock stratum 6 and the third rock stratum 5.
In one embodiment of the application, grouting liquid is dispersed in a fracture zone formed by the second rock layer 6 and the third rock layer 5 through high-order drilling grouting in a roadway, and regenerative fractures in the fracture zone are closed, so that the fracture zone is bonded into a whole, the supporting force of the fracture zone is enhanced, and the fracture zone has better stable bearing capacity. And after grouting through the in-roadway drilling, the goaf and the overlying strata are mutually separated by grouting, so that gas in the strata can be prevented from entering the entry retaining roadway 10.
And drilling a plurality of in-lane drilling holes in one lane. In one embodiment of the application, the two sides of the working surface are respectively a retaining roadway 10 and a non-retaining roadway 11, and a plurality of intra-roadway low-level drilling holes and a plurality of intra-roadway high-level drilling holes are drilled in the retaining roadway 10, so that grouting operation on all drilling holes can be completed only by arranging grouting equipment in one roadway, thereby saving grouting cost and being more convenient for grouting operation. The in-lane low-level drilling holes comprise a first in-lane low-level drilling hole 14, a second in-lane low-level drilling hole 15 and a third in-lane low-level drilling hole 16; the first lane low-level drilling hole 14, the second lane low-level drilling hole 15 and the third lane low-level drilling hole 16 extend into the first interface 21; the intra-roadway high-level drilling comprises a first intra-roadway high-level drilling 12 and a second intra-roadway high-level drilling 13, wherein the first intra-roadway high-level drilling 12 extends into the second rock layer 6, the second intra-roadway high-level drilling 13 extends into the third rock layer 5,
in other embodiments, the roadway retaining lanes are arranged on two sides of the working face, and at the moment, the in-roadway drilling holes can be drilled from the lanes on two sides of the working face respectively, so that the in-roadway drilling holes on two sides of the working face are drilled nearby, the length of the roadway drilling holes is reduced, and the grouting transmission distance is reduced.
A curved dip zone is formed in formation four 4, five 3 above formation three 5 with the termination points of the plurality of surface low-lying boreholes 18 being located within the curved dip zone. In one embodiment of the application, grouting is carried out on the bending subsidence zone through the underground surface drilling, so that the fine cracks in the bending subsidence zone are filled, the development of the fine cracks formed in the bending subsidence zone consisting of the rock stratum four 4 and the rock stratum five 3 is restrained, and the bending subsidence of the rock stratum four 4 and the rock stratum five 3 is further reduced.
A delamination area 19 is formed between the formation five 3 and the formation six 2, and termination points of the plurality of surface high-level drillings 17 are located inside the delamination area 19.
In one embodiment of the application, grouting is performed in the delamination area 19 through the surface high-level drilling 17, wherein the surface drilling performs high-pressure grouting; so that the delamination area 19 is filled with the grouting liquid, the space for downward displacement of the delamination area 19 is eliminated as much as possible, and the possibility of deformation of the delamination area 19 is avoided as much as possible.
The grouting liquid used in grouting the in-lane drilling is Marie powder. In one embodiment of the application, the low-level grouting slurry has certain cohesiveness and certain strength, and needs to bear the pressure of the overburden together with the goaf gangue; marie powder, namely polyimide resin material, has good adhesiveness and high strength, is more convenient for bonding and filling broken gangue and fracture zones of the goaf, and can ensure that the broken gangue and fracture zones of the goaf have better overall structural strength after grouting.
The grouting liquid used in grouting the surface low-level drilling 18 is Marie powder; the grouting liquid used in grouting the ground surface high-level drilling 17 is cement or slurry.
In one embodiment of the present application, the lower surface borehole 18 uses Marie's powder as grouting fluid to ensure good adhesion and filling of the sinkage strap, so that sinkage of the sinkage strap is further controlled; the high-level surface drilling holes 17 are filled with cement or slurry into the separation layer area 19, and mainly play a role in filling the separation layer area 19, so that the upper rock stratum can be controlled without larger subsidence.
In step 1, the slit 9 penetrates the first rock layer 7 above the coal seam 8, and the slit 9 is inclined towards the central axis direction of the two roadways so as to separate the top plate above the coal seam 8 from the top plate above the roadways.
In one embodiment of the application, the slits 9 are arranged in the two roadways in an inclined way, and the two slits 9 incline towards the central axis direction of the two roadways, and specifically, the included angle between the slits 9 and the horizontal plane is smaller than 90 degrees; and the cutting penetrates through the rock stratum I7, so that two cutting slits 9 are formed in the rock stratum I7 to form a top plate with a trapezoid structure in cross section, and after the coal seam 8 is mined, the top plate with the trapezoid structure is easier to collapse, and a better collapse effect is ensured as much as possible.
The height of the goaf is in direct proportion to the number of vertical rows of the holes in the roadway, the width of the goaf is in direct proportion to the number of transverse columns of the holes in the roadway, and the width of the goaf is in direct proportion to the number of holes in the ground surface.
In one embodiment of the application, when the goaf height is larger, the number of vertical rows of grouting pipes is increased in proper amount, and when the goaf length is larger, the number of transverse columns is increased; that is, the higher the goaf height, the more the vertical arrangement number of the in-roadway drilling holes is, the larger the goaf width is, and the more the transverse arrangement number of the in-roadway drilling holes is; meanwhile, the width of the goaf is also large, the more surface drilling holes are arranged in the transverse direction, and the drilling holes are mainly arranged towards the positions where the holes exist.
In summary, after the goaf roof is mined by the working face along the kerf and collapses, the goaf overlying strata deformation can be effectively controlled by performing multi-dimensional grouting operation on the roof of the gob roof-cutting entry retaining stope through drilling holes in the roadway and drilling holes in the earth surface, and the problem of earth surface subsidence is solved.
It is to be understood that the above description is intended to be illustrative, and that the embodiments of the present application are not limited thereto.
The foregoing description of the preferred embodiments of the application is not intended to limit the application to the particular embodiments disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the application as defined by the appended claims.
Claims (10)
1. A construction method for grouting control gob-side entry retaining stope roof is characterized in that a first rock stratum, a second rock stratum, a third rock stratum, a fourth rock stratum, a fifth rock stratum, a sixth rock stratum and a seventh rock stratum are sequentially arranged above a coal bed from top to bottom;
the construction method comprises the following steps:
step 1, two tunnels are excavated in a coal seam, the medium of the middle part of the two tunnels is a working surface of a section, and a roof of a retaining tunnel is cut from the inside of the tunnel;
step 2, after deformation of the cut surrounding rock is stable, drilling holes in the surrounding rock in the roadway obliquely upwards, and continuously pumping gas through the holes in the roadway;
the in-lane drilling comprises a plurality of in-lane low-level drilling holes and a plurality of in-lane high-level drilling holes, and the depth of the in-lane high-level drilling holes is larger than that of the in-lane low-level drilling holes;
step 3, after the working face is adopted, stopping gas drainage in the roadway drilling holes, filling and grouting through the low-level drilling holes in the roadway, and performing penetration and splitting grouting through the high-level drilling holes in the roadway; the grouting pressure of the penetration and cleavage grouting is higher than that of the filling grouting;
step 4, after the working face is adopted, the goaf roof begins to collapse, at the moment, surface drilling holes are drilled downwards from the surface, and grouting is conducted into surrounding rock through the surface drilling holes;
the surface drilling comprises a surface high-level drilling and a surface low-level drilling, and the depth of the low-level drilling is larger than that of the surface high-level drilling.
2. The construction method of the grouting control gob-side entry retaining stope roof according to claim 1, wherein after working face mining, rock formation one collapses and goaf broken gangue is formed; the termination positions of the low-level drilling holes in the roadway are junctions of the first rock stratum and the second rock stratum, and the termination positions of the low-level drilling holes in the roadway are uniformly distributed in the width direction of the coal seam.
3. The construction method of the grouting control gob-side entry retaining stope roof according to claim 2, wherein after the rock stratum collapses, a crack zone is formed by a rock stratum two and a rock stratum three above the rock stratum one, and the termination positions of a plurality of in-roadway high-position drilling holes are uniformly distributed in the crack zone formed by the rock stratum two and the rock stratum three.
4. The construction method of the roof of the gob-side entry retaining stope for controlling grouting according to claim 3, wherein a plurality of the in-lane drill holes are drilled in one lane.
5. The construction method of the roof of the gob-side entry retaining stope according to claim 3, wherein a bending subsidence zone is formed in the fourth and fifth rock layers above the third rock layer, and the termination positions of the plurality of surface low-level boreholes are located inside the bending subsidence zone.
6. The construction method of the roof of the gob-side entry retaining stope according to claim 5, wherein a separation zone is formed between the fifth rock layer and the sixth rock layer, and termination positions of the plurality of ground surface high-level boreholes are located inside the separation zone.
7. The construction method of the roof of the gob-side entry retaining stope according to any one of claims 1 to 6, wherein the grouting liquid used in grouting the in-lane drilled hole is marlisan.
8. The construction method of the roof of the gob-side entry retaining stope for controlling grouting according to claim 7, wherein grouting liquid used in grouting of the surface low-level borehole is Marie;
grouting liquid used in grouting of the surface high-level drilling is cement or slurry.
9. The method for constructing a roof of a gob-side entry retaining stope according to any one of claims 1 to 6, wherein in step 1, a slit penetrates a first rock layer above a coal seam, and the slit is inclined toward a central axis of both roadways so as to separate the roof above the coal seam from the roof above the roadway.
10. The construction method of the roof of the gob-side entry retaining stope according to any one of claims 1 to 6, wherein the height of the goaf is proportional to the number of vertical rows of in-roadway boreholes, the width of the goaf is proportional to the number of horizontal rows of in-roadway boreholes, and the width of the goaf is proportional to the number of surface boreholes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310968330.9A CN117167022A (en) | 2023-08-03 | 2023-08-03 | Construction method for grouting control gob-side entry retaining stope roof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310968330.9A CN117167022A (en) | 2023-08-03 | 2023-08-03 | Construction method for grouting control gob-side entry retaining stope roof |
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| CN117167022A true CN117167022A (en) | 2023-12-05 |
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| CN202310968330.9A Pending CN117167022A (en) | 2023-08-03 | 2023-08-03 | Construction method for grouting control gob-side entry retaining stope roof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117552813A (en) * | 2024-01-12 | 2024-02-13 | 中国矿业大学(北京) | Surrounding rock reinforcement construction method for deep roadway |
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2023
- 2023-08-03 CN CN202310968330.9A patent/CN117167022A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117552813A (en) * | 2024-01-12 | 2024-02-13 | 中国矿业大学(北京) | Surrounding rock reinforcement construction method for deep roadway |
| CN117552813B (en) * | 2024-01-12 | 2024-03-15 | 中国矿业大学(北京) | Surrounding rock reinforcement construction method for deep roadway |
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