CN114215531A - Coal mine tunnel ultra-soft surrounding rock modification method and structure - Google Patents
Coal mine tunnel ultra-soft surrounding rock modification method and structure Download PDFInfo
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- CN114215531A CN114215531A CN202111459119.1A CN202111459119A CN114215531A CN 114215531 A CN114215531 A CN 114215531A CN 202111459119 A CN202111459119 A CN 202111459119A CN 114215531 A CN114215531 A CN 114215531A
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- 239000011435 rock Substances 0.000 title claims abstract description 97
- 239000003245 coal Substances 0.000 title claims abstract description 48
- 238000002715 modification method Methods 0.000 title claims abstract description 7
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 120
- 239000010959 steel Substances 0.000 claims abstract description 120
- 238000000034 method Methods 0.000 claims abstract description 33
- 239000002002 slurry Substances 0.000 claims abstract description 16
- 238000007711 solidification Methods 0.000 claims abstract description 4
- 230000008023 solidification Effects 0.000 claims abstract description 4
- 238000007569 slipcasting Methods 0.000 claims description 18
- 239000011398 Portland cement Substances 0.000 claims description 11
- 238000007789 sealing Methods 0.000 claims description 8
- 239000004568 cement Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 230000008093 supporting effect Effects 0.000 description 9
- 238000010276 construction Methods 0.000 description 8
- 238000005553 drilling Methods 0.000 description 8
- 230000004048 modification Effects 0.000 description 6
- 238000012986 modification Methods 0.000 description 6
- 239000007788 liquid Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000005641 tunneling Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000002318 adhesion promoter Substances 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000518 rheometry Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- E21D9/001—Improving soil or rock, e.g. by freezing; Injections
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
- E21D20/021—Grouting with inorganic components, e.g. cement
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Abstract
The invention relates to the technical field of roadway support, and provides a method and a structure for modifying extremely soft surrounding rock of a coal mine roadway. The method for modifying the extremely soft surrounding rock of the coal mine roadway comprises the following steps: constructing a plurality of drill holes which are arranged at intervals on a top plate of the roadway; inserting a plurality of steel pipes into the plurality of drilled holes respectively; installing a grouting rubber plug at the orifice of the drill hole; and performing high-pressure grouting on the plurality of drill holes through the grouting rubber plugs, and waiting for the solidification of a plurality of high-pressure grouting slurry in the drill holes after the high-pressure grouting is finished. The coal mine roadway extremely-soft surrounding rock modification method provided by the invention is matched with anchor rod anchor cable net or grouting anchor rod anchor cable net support, so that the support effect of the soft rock roadway is ensured, and the safety and reliability of coal mine production are improved.
Description
Technical Field
The invention relates to the technical field of roadway support, in particular to a method and a structure for modifying extremely soft surrounding rock of a coal mine roadway.
Background
In the coal mining process, the surrounding rocks of the roadway are generally sedimentary rocks, and the intensity of the sedimentary rocks is generally lower. In the process of roadway excavation, roadway surrounding rocks are damaged, and with the change of geological conditions and the increase of mining depth, the change of the soft rock characteristics of the surrounding rocks is more and more obvious under the conditions of cementing performance and high stress of the surrounding rocks.
In order to support a roadway, anchor rod and anchor cable support is generally adopted, but the requirement for roadway support cannot be met by adopting the anchor rod and anchor cable support only, the support is affected by soft rock creep, rheology and insufficient anchoring force, the strength of a bearing structure formed in surrounding rocks of the roadway is small or an effective bearing structure cannot be formed, the deformation of the roadway is serious, the conditions of roof sinking, bottom heave and the like occur in the roadway, even the risk of roof collapse is generated, and the safety production of a coal mine is seriously affected.
Disclosure of Invention
The invention provides a coal mine tunnel extremely soft surrounding rock modification method and structure, which are used for overcoming the defects that the strength of a bearing structure formed in tunnel surrounding rock is small or an effective bearing structure cannot be formed in the prior art, realizing the comprehensive control effect of the coal mine soft rock tunnel surrounding rock, and improving the safety and reliability of coal mine production.
The invention provides a coal mine roadway extremely-soft surrounding rock modification method, which comprises the following steps:
constructing a plurality of drill holes which are arranged at intervals on a top plate of the roadway;
inserting a plurality of steel pipes into the plurality of drilled holes respectively;
installing a grouting rubber plug at the orifice of the drill hole;
and performing high-pressure grouting on the plurality of drill holes through the grouting rubber plugs, and waiting for the solidification of a plurality of high-pressure grouting slurry in the drill holes after the high-pressure grouting is finished.
According to the method for modifying the extremely soft surrounding rock of the coal mine roadway, the step of respectively inserting the plurality of steel pipes into the plurality of drill holes comprises the following steps:
and if the diameter of the steel pipe is smaller than that of the drill hole, respectively inserting the steel pipes into the drill holes, and sealing the hole opening of the drill hole.
According to the method for modifying the extremely soft surrounding rock of the coal mine roadway, the step of respectively inserting the plurality of steel pipes into the plurality of drill holes comprises the following steps:
and if the diameter of the steel pipe is larger than that of the drill hole, directly inserting the steel pipes into the drill holes respectively.
According to the method for modifying the extremely soft surrounding rock of the coal mine roadway, which is provided by the invention, before the step of respectively inserting a plurality of steel pipes into a plurality of drill holes, the method comprises the following steps of:
determining the distance between adjacent friction structures according to the hole depth of the drilled hole;
and arranging a plurality of friction structures at intervals on the side wall of the steel pipe.
According to the method for modifying the extremely soft surrounding rock of the coal mine roadway, the grouting rubber plug is provided with an exhaust hole and a grouting hole, the exhaust hole is connected with an exhaust pipe, the grouting hole is connected with a grouting pipe, the exhaust pipe and the grouting pipe are both arranged in the drill hole, the exhaust pipe extends to the bottom of the drill hole, and the grouting hole is used for being connected with a grouting pump.
According to the method for modifying the extremely soft surrounding rock of the coal mine roadway, provided by the invention, the slurry for high-pressure grouting is portland cement, and the water cement ratio of the portland cement is 0.5-0.7: 1.
According to the coal mine roadway extremely-soft surrounding rock modification method provided by the invention, the depth of the drilled hole is not less than 1.2-1.5 times of the roadway span.
The invention also provides a coal mine tunnel extremely soft surrounding rock modified structure, which comprises the following components: a plurality of miniature steel pipe bored concrete piles, it is a plurality of miniature steel pipe bored concrete pile locates the roof in tunnel, miniature steel pipe bored concrete pile includes steel pipe and slip casting obturator, the slip casting obturator fill in the steel pipe with between the tunnel country rock.
According to the coal mine roadway extremely-soft surrounding rock modified structure provided by the invention, the micro steel pipe cast-in-place piles are divided into a plurality of groups of steel pipe pile structure groups, each steel pipe pile structure group comprises a plurality of micro steel pipe cast-in-place piles which are arranged at intervals along the direction of the section of the roadway, and the plurality of groups of steel pipe pile structure groups are arranged at intervals along the length direction of the roadway.
According to the coal mine roadway extremely soft surrounding rock modified structure provided by the invention, the coal mine roadway extremely soft surrounding rock modified structure further comprises a plurality of anchor rod structure groups and a plurality of anchor cable structure groups, and an anchor rod structure group and an anchor cable structure group are arranged between every two adjacent steel pipe pile structure groups.
According to the method and the structure for modifying the extremely soft surrounding rock of the coal mine roadway, provided by the invention, a plurality of micro steel pipe cast-in-place piles can be finally formed at the top plate of the roadway by the construction method, so that the physical properties of the roadway surrounding rock are greatly improved, the strength and the rigidity of the roadway surrounding rock are improved, a complete bearing structure is formed in the roadway surrounding rock by matching with an anchor rod and anchor cable net or a grouting anchor rod and anchor cable net support, and the comprehensive control effect of the roadway surrounding rock of the coal mine soft rock is ensured. Compared with the existing roadway supporting method, the roadway surrounding rock can be modified, the bearing strength of the roadway surrounding rock is improved, the supporting effect of the soft rock roadway is ensured, and the safety and reliability of coal mine production are improved.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic flow chart of a method for modifying extremely soft surrounding rock of a coal mine roadway provided by the invention;
FIG. 2 is a schematic diagram of a modified structure of extremely soft surrounding rock of a coal mine roadway provided by the invention;
FIG. 3 is one of the structural schematic diagrams of a micro steel tube cast-in-place pile of a coal mine tunnel extremely soft surrounding rock modified structure provided by the invention;
FIG. 4 is a second schematic structural diagram of a micro steel tube cast-in-place pile of a coal mine tunnel ultra-soft surrounding rock modified structure provided by the invention;
reference numerals:
10: pouring the miniature steel pipe into the pile; 11: a steel pipe; 12: grouting a filling body;
20: an anchor rod structure group; 30: and (4) anchor cable structure groups.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The method provided by the invention mainly aims at the roadway surrounding rocks with poor physical and mechanical properties, such as weakly cemented mudstone, high-stress soft rock and the like, improves the strength and rigidity of the surrounding rocks by modifying the surrounding rocks, and then can be matched with an anchor rod and anchor cable net or a grouting anchor rod and anchor cable net for supporting to form a complete bearing structure in the roadway surrounding rocks, thereby ensuring the comprehensive control effect of the roadway surrounding rocks of the soft rock of the coal mine. The method provided by the following description aims at modification of the top plate of the roadway, roof disasters such as roof collapse can be avoided, and the side part or the bottom plate of the roadway can be modified according to needs so as to improve the overall surrounding rock strength of the roadway. In addition, the method provided by the invention can be constructed when a roadway is tunneled, of course, the method can also be constructed when the roadway is repaired, the deformed section of the roadway needs to be repaired to the original section, and then the following method is constructed. The tunnel according to the present invention is not limited to the rectangular cross section given in the present embodiment, and may be an arched cross section or a semicircular cross section, etc., as necessary.
The method and the structure for modifying the extremely soft surrounding rock of the coal mine roadway are described in the following by combining the figures 1-4.
Referring to fig. 1 to 4, in an embodiment of the present invention, a method for modifying ultra-soft surrounding rock of a coal mine roadway includes:
100, constructing a plurality of drill holes which are arranged at intervals on a top plate of a roadway; when the drill hole is constructed, the drill hole is vertical to the roadway wall of the roadway, so that the construction is convenient, and the maximum area of surrounding rock modification is ensured.
200, inserting a plurality of steel pipes 11 into the plurality of drilled holes, respectively; the steel pipe 11 is circular, a hole is formed in the position, close to the hole opening of the drill hole, of the steel pipe 11 so that slurry can be injected, when the steel pipe 11 is inserted, the length of the steel pipe 11 needs to be determined according to the hole depth of the drill hole, and after the steel pipe 11 is inserted, the steel pipe 11 needs to be ensured not to fall out of the drill hole;
300, installing a grouting rubber plug at the orifice of the drill hole; the grouting rubber plug is arranged, so that subsequent grouting is facilitated, and the leakage of slurry is avoided;
400, performing high-pressure grouting on the plurality of drill holes through the grouting rubber plugs, and waiting for the high-pressure grouting slurry in the plurality of drill holes to solidify after the high-pressure grouting is finished; carry out high-pressure slip casting in to the drilling for it has the thick liquid to fill between country rock and the steel pipe 11, with form miniature steel pipe bored concrete pile 10 in the country rock, realize the modification to tunnel roof country rock, like this, combine stock anchor rope or slip casting stock anchor rope to strut, can effectively support tunnel country rock.
In the embodiment, a plurality of micro steel pipe cast-in-place piles 10 can be finally formed at the top plate of the roadway through the construction method, so that the physical properties of the roadway surrounding rock are greatly improved, the strength and the rigidity of the roadway surrounding rock are improved, and a complete bearing structure is formed in the roadway surrounding rock by matching with anchor rod anchor cable nets or grouting anchor rod anchor cable net supports, so that the comprehensive control effect of the coal mine soft rock roadway surrounding rock is ensured. Compared with the existing roadway supporting method, the roadway surrounding rock can be modified, the bearing strength of the roadway surrounding rock is improved, the supporting effect of the soft rock roadway is ensured, and the safety and reliability of coal mine production are improved.
In addition, before construction, firstly, evaluating the stress environment of the surrounding rock of the roadway to determine the stress characteristics of the surrounding rock of the roadway; for weakly cemented mudstone, the weakly cemented performance (soft rock composition) and the like of the weakly cemented mudstone are evaluated through a laboratory test, and whether the miniature steel pipe cast-in-place pile 10 is adopted at the upper part or the bottom part is determined according to the field evaluation condition.
Referring to fig. 3, in an embodiment of the present invention, the step of inserting the steel pipes 11 into the drill holes respectively includes:
and if the diameter of the steel pipe 11 is smaller than that of the drill hole, respectively inserting the steel pipes 11 into the drill holes, and sealing the hole openings of the drill holes.
That is, when the diameter of the steel pipe 11 is smaller than the diameter of the drilled hole, the hole of the drilled hole is sealed to prevent the steel pipe 11 from falling after the steel pipe 11 is inserted, thereby ensuring that the steel pipe 11 is stably placed in the drilled hole. For example, a 6-minute steel pipe is used, and the length of the steel pipe 11 is determined according to the depth of the drilled hole. In this embodiment, a hole sealing device may be used, and the hole sealing device is disposed on the periphery of the steel pipe 11, so that when the steel pipe 11 is inserted, the friction force between the steel pipe 11 and the wall of the drilled hole is increased by the hole sealing device, and the steel pipe 11 can be prevented from slipping off from the drilled hole.
Like this, establish the slip casting plug or carry out the hukou to the drill way in drill way department after this again, can further avoid steel pipe 11 landing to, when high pressure slip casting, can follow hole sealing device and slip casting plug slip casting respectively, through slip casting plug to steel pipe 11 in slip casting, through the clearance slip casting of hole sealing device between 11 steel pipe and the drilling, so that the gap between drilling and the steel pipe 11 is filled to the thick liquid, and in filling the steel pipe 11, form the little tubular steel bored concrete pile 10 of high strength.
Referring to fig. 4, in another embodiment, the step of inserting the steel pipes 11 into the drill holes respectively includes:
if the diameter of the steel pipe 11 is larger than the diameter of the drill hole, the steel pipes 11 are directly inserted into the drill holes respectively.
When the diameter of the steel pipe 11 is larger than that of the drilled hole, the steel pipe 11 is directly inserted, and the side wall of the drilled hole extrudes the steel pipe 11, so that the steel pipe 11 can be prevented from sliding off through the friction force between the steel pipe 11 and the side wall of the drilled hole. And then, grouting can be carried out in the steel pipe 11 through a grouting rubber plug to obtain the miniature steel pipe cast-in-place pile 10.
In one embodiment of the invention, when grouting is carried out through the grouting rubber plug, the grouting rubber plug is provided with an exhaust hole and a grouting hole, the exhaust hole is connected with an exhaust pipe, the grouting hole is connected with a grouting pipe, the exhaust pipe and the grouting pipe are both arranged in the drill hole, the exhaust pipe extends to the hole bottom of the drill hole, and the grouting hole is used for being connected with a grouting pump.
Like this, can be to the interior slip casting of drilling through the injected hole to fill steel pipe 11 and drilling, and through the air escape of blast pipe in with the drilling, can guarantee that the thick liquid is filled closely knit, in order to obtain the miniature steel pipe bored concrete pile 10 of high strength high rigidity.
Referring to fig. 1, in an embodiment of the present invention, before the step of inserting the steel pipes 11 into the drill holes respectively, the method for modifying the extremely soft surrounding rock of the coal mine roadway includes:
determining the distance between adjacent friction structures according to the hole depth of the drilled hole;
and a plurality of friction structures arranged at intervals are arranged on the side wall of the steel pipe 11.
Through the friction structure that sets up, frictional force between multiplicable steel pipe 11 and the drilling lateral wall on the one hand avoids steel pipe 11 landing at the insertion in-process, convenient construction, and on the other hand, after high-pressure slip casting, the thick liquid combines together with this friction structure, has further increased the holistic structural strength of miniature steel pipe bored concrete pile 10.
In this embodiment, the friction structure may be a plurality of screws welded to the outer periphery of the steel pipe 11, and the plurality of screws are arranged in a quincunx shape and are annularly arranged to the outer periphery of the steel pipe 11. In another embodiment, in the case that the steel pipe 11 is smaller than the diameter of the drilled hole, a steel ring is welded on the periphery of the plurality of screws, so that the steel pipe 11 can be stably inserted into the drilled hole. Furthermore, a friction structure may be disposed inside the steel pipe 11, which is not described in detail.
Referring to fig. 1, in an embodiment of the present invention, the slurry for high-pressure grouting is portland cement, and a water cement ratio of the portland cement is 0.5-0.7: 1.
Optionally, the water cement ratio of the portland cement is 0.5:1, 0.6:1 or 0.7:1, the structural strength of the slurry after solidification can be ensured by injecting the portland cement, so as to improve the modification effect of the whole roadway, and the portland cement can be selected from but not limited to portland cement glass slurry. Furthermore, according to specific construction requirements, certain additives such as an accelerator and a metal adhesion promoter can be matched in the portland cement. In another embodiment, the slurry for high-pressure grouting can also be chemical slurry, and the chemical slurry can be injected to quickly react and solidify, so that the construction efficiency is improved, and specifically, the slurry can be selected according to the site construction environment.
Referring to fig. 1, in addition, in an embodiment of the present invention, the depth of the drilled hole is not less than 1.2 to 1.5 times of the roadway span.
Optionally, the depth of the drilled hole is 1.5 times of the roadway span, the roadway span is the distance from the side part of one side of the roadway to the side part of the other side of the roadway, and the length of the micro steel pipe cast-in-place pile 10 is correspondingly obtained through the set drilling depth, so that the structural strength of the surrounding rock of the roadway is ensured, and the supporting effect of the subsequent roadway is ensured.
In the embodiment of the invention, high-pressure grouting is adopted, and slurry can be further filled into cracks around the drill hole, so that a strengthening area can be formed at the periphery of the micro steel pipe cast-in-place pile 10, and the overall strength and rigidity of the roadway surrounding rock are improved under the action of the plurality of micro steel pipe cast-in-place piles 10.
In addition, in another embodiment of the invention, the micro steel pipe cast-in-place pile 10 provided by the embodiment of the invention can be further constructed at the side part and the bottom part of the roadway, so that the surrounding rock strength and rigidity of the periphery of the roadway are uniformly improved, and the supporting effect of the roadway is further improved by supporting with an anchor rod and anchor cable net or a grouting anchor rod and anchor cable net.
Referring to fig. 2 to 4, based on the above method, the present invention further provides a coal mine roadway very soft surrounding rock modification structure, including: a plurality of little steel pipe bored concrete piles 10, it is a plurality of little steel pipe bored concrete piles 10 locates the roof in tunnel, little steel pipe bored concrete piles 10 includes steel pipe 11 and slip casting obturator 12, slip casting obturator 12 fill in steel pipe 11 with between the tunnel country rock.
Through a plurality of miniature steel pipe bored concrete piles 10 that the roof set up, very big improvement the physics performance of tunnel country rock, improved the intensity and the rigidity of tunnel country rock, support with stock anchor cable net or slip casting stock anchor cable net, form complete bearing structure in tunnel country rock, guaranteed the integrated control effect of colliery soft rock tunnel country rock, improved the security and the reliability of coal mine production.
Referring to fig. 2, based on the above structure, the micro steel pipe cast-in-place piles 10 are divided into a plurality of steel pipe pile structure sets, each steel pipe pile structure set includes a plurality of micro steel pipe cast-in-place piles 10 arranged at intervals along the cross section direction of the roadway, and the plurality of steel pipe pile structure sets are arranged at intervals along the length direction of the roadway.
Therefore, the strength of the surrounding rocks of the top plate at each position of the roadway is improved, and the overall supporting effect of the roadway is ensured. Specifically, when the plurality of micro steel pipe cast-in-place piles 10 are constructed in the process of tunneling a roadway, the micro steel pipe cast-in-place piles 10 are constructed in sequence while tunneling, and when the roadway is repaired, the roadway section is repaired to the original section, and then the micro steel pipe cast-in-place piles 10 are constructed. Preferably, a plurality of micro steel pipe cast-in-place piles 10 arranged at intervals along the section direction of the roadway are arranged at even intervals, and a plurality of steel pipe pile structure groups arranged at intervals along the length direction of the roadway are arranged at even intervals. The spacing of steel-pipe pile structure group and the spacing between miniature steel-pipe bored concrete piles 10 can be set according to the stress characteristics of tunnel country rock.
Referring to fig. 2, further, the coal mine roadway extremely soft surrounding rock modified structure further includes a plurality of anchor rod structure groups 20 and a plurality of anchor cable structure groups 30, and an anchor rod structure group 20 and an anchor cable structure group 30 are arranged between each two adjacent steel pipe pile structure groups.
Anchor rod structure group 20 is a plurality of anchor rods along tunnel section direction interval arrangement, and anchor rope structure group 30 is a plurality of anchor ropes along tunnel section direction interval arrangement, through setting up anchor rod structure group 20 and anchor rope structure group 30 at adjacent steel-pipe pile structure group to the stock or the anchor rope anchor of guaranteeing each position are stable, so that the bearing structure that cooperation stock anchor rope was strutted is stable effective. Of course, in other embodiments, the anchor rod structure group 20 and the anchor cable structure group 30 may be specifically set according to the characteristics of the surrounding rock, which is not described in detail.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A coal mine roadway extremely-soft surrounding rock modification method is characterized by comprising the following steps:
constructing a plurality of drill holes which are arranged at intervals on a top plate of the roadway;
inserting a plurality of steel pipes into the plurality of drilled holes respectively;
installing a grouting rubber plug at the orifice of the drill hole;
and performing high-pressure grouting on the plurality of drill holes through the grouting rubber plugs, and waiting for the solidification of a plurality of high-pressure grouting slurry in the drill holes after the high-pressure grouting is finished.
2. The method for modifying the extremely soft surrounding rock of the coal mine roadway according to claim 1, wherein the step of inserting a plurality of steel pipes into the plurality of drilled holes respectively comprises:
and if the diameter of the steel pipe is smaller than that of the drill hole, respectively inserting the steel pipes into the drill holes, and sealing the hole opening of the drill hole.
3. The method for modifying the extremely soft surrounding rock of the coal mine roadway according to claim 1, wherein the step of inserting a plurality of steel pipes into the plurality of drilled holes respectively comprises:
and if the diameter of the steel pipe is larger than that of the drill hole, directly inserting the steel pipes into the drill holes respectively.
4. The method for modifying the extremely soft surrounding rock of the coal mine roadway according to any one of claims 1 to 3, wherein before the step of inserting the plurality of steel pipes into the plurality of drilled holes respectively, the method comprises:
determining the distance between adjacent friction structures according to the hole depth of the drilled hole;
and arranging a plurality of friction structures at intervals on the side wall of the steel pipe.
5. The method for modifying the extremely soft surrounding rock of the coal mine roadway according to any one of claims 1 to 3, wherein the grouting rubber plug is provided with an exhaust hole and a grouting hole, the exhaust hole is connected with an exhaust pipe, the grouting hole is connected with a grouting pipe, the exhaust pipe and the grouting pipe are both arranged in the drill hole, the exhaust pipe extends to the bottom of the drill hole, and the grouting hole is used for being connected with a grouting pump.
6. The method for modifying the extremely soft surrounding rock of the coal mine roadway according to any one of claims 1 to 3, wherein the slurry for high-pressure grouting is portland cement, and the water cement ratio of the portland cement is 0.5-0.7: 1.
7. The method for modifying the extremely soft surrounding rock of the coal mine roadway according to any one of claims 1 to 3, wherein the depth of the drilled hole is not less than 1.2-1.5 times of the roadway span.
8. The utility model provides a modified structure of colliery tunnel extremely soft country rock which characterized in that includes: a plurality of miniature steel pipe bored concrete piles, it is a plurality of miniature steel pipe bored concrete pile locates the roof in tunnel, miniature steel pipe bored concrete pile includes steel pipe and slip casting obturator, the slip casting obturator fill in the steel pipe with between the tunnel country rock.
9. The coal mine roadway extremely-soft surrounding rock modified structure as claimed in claim 8, wherein the micro steel pipe cast-in-place piles are divided into a plurality of groups of steel pipe pile structure groups, each steel pipe pile structure group comprises a plurality of micro steel pipe cast-in-place piles arranged at intervals along the direction of the cross section of the roadway, and the plurality of groups of steel pipe pile structure groups are arranged at intervals along the length direction of the roadway.
10. The modified structure of the extremely soft surrounding rock in the coal mine roadway according to claim 9, further comprising a plurality of anchor rod structure groups and a plurality of anchor cable structure groups, wherein an anchor rod structure group and an anchor cable structure group are arranged between every two adjacent steel pipe pile structure groups.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111459119.1A CN114215531A (en) | 2021-12-02 | 2021-12-02 | Coal mine tunnel ultra-soft surrounding rock modification method and structure |
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| CN202111459119.1A CN114215531A (en) | 2021-12-02 | 2021-12-02 | Coal mine tunnel ultra-soft surrounding rock modification method and structure |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN102996149A (en) * | 2012-11-21 | 2013-03-27 | 山东科技大学 | Support method for bolt-grouting composite crushing dynamic-pressure roadway soft rock roof by high-pre-stressed anchor cable |
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