CN110566238A - Mud rock roof small coal pillar gob-side roadway supporting structure and method thereof - Google Patents
Mud rock roof small coal pillar gob-side roadway supporting structure and method thereof Download PDFInfo
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- CN110566238A CN110566238A CN201910918212.0A CN201910918212A CN110566238A CN 110566238 A CN110566238 A CN 110566238A CN 201910918212 A CN201910918212 A CN 201910918212A CN 110566238 A CN110566238 A CN 110566238A
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- 239000011435 rock Substances 0.000 title claims abstract description 52
- 239000003245 coal Substances 0.000 title claims abstract description 38
- 230000008093 supporting effect Effects 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000005065 mining Methods 0.000 claims abstract description 36
- 230000008569 process Effects 0.000 claims abstract description 9
- 230000005641 tunneling Effects 0.000 claims abstract description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 76
- 239000010959 steel Substances 0.000 claims description 76
- 238000004873 anchoring Methods 0.000 claims description 9
- 238000010276 construction Methods 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000011084 recovery Methods 0.000 abstract description 2
- 238000007569 slipcasting Methods 0.000 description 7
- 230000006378 damage Effects 0.000 description 5
- 238000000605 extraction Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 230000003014 reinforcing effect Effects 0.000 description 4
- 239000000725 suspension Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 3
- 238000009423 ventilation Methods 0.000 description 3
- 238000009412 basement excavation Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
- E21D11/14—Lining predominantly with metal
- E21D11/15—Plate linings; Laggings, i.e. linings designed for holding back formation material or for transmitting the load to main supporting members
- E21D11/152—Laggings made of grids or nettings
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
- E21D11/14—Lining predominantly with metal
- E21D11/15—Plate linings; Laggings, i.e. linings designed for holding back formation material or for transmitting the load to main supporting members
- E21D11/155—Laggings made of strips, slats, slabs or sheet piles
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
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Abstract
The invention discloses a supporting structure and a supporting method for a small coal pillar gob-side roadway with a mud-rock roof, which comprises the following steps: determining at least one mining roadway to be supported on a current mining working face, wherein the top plate and two sides of the mining roadway are provided with permanent supports, and the mining roadway is dug in advance and is subjected to permanent support in the tunneling process; and secondly, carrying out advanced support on the stoping roadway, constructing one row of grouting anchor rods on every two rows of anchor rods on the top plate of the stoping roadway along the advancing direction while stoping the stoping working face, constructing one row of grouting anchor cables on every two rows of anchor rods, and constructing one row of grouting anchor rods or grouting anchor cables between every two adjacent rows of anchor rods. The invention has the beneficial technical results that: firstly, the supporting efficiency is greatly improved while the safe recovery is ensured; the space area of a stoping roadway is greatly saved; simple structure, convenient operation, low cost and low labor intensity of workers.
Description
Technical Field
The invention relates to the field of gob-side small coal pillar shale roof support, in particular to a gob-side roadway support structure for a small coal pillar of a shale roof and a method thereof.
Background
In the production process of a coal mine, the forepoling section of the fully mechanized mining face is influenced by mining disturbance of the face, the mine pressure is displayed abnormally and strongly, compared with the common fully mechanized mining face, the forepoling pressure is large, the influence range is far, certain impact danger is accompanied, the tunnel surrounding rock plastic area and the crushing area range are further enlarged under the superposition effect of the forepoling pressure, the lateral roof supporting pressure and the mining area lateral suspension supporting pressure, and the normal use of the tunnel is influenced due to serious deformation of the tunnel surrounding rock. The mudstone roof has poor stability, the joint cracks of the roof develop relatively, the strength of surrounding rocks is low, the roof is damaged and broken abnormally and strongly under the action of water spraying and ventilation, and after a roadway is excavated, the roof is air-dried into a piece-mounted structure, so that the roof is prone to large-area collapse and roof fall accidents during the stoping of a working face. The small coal pillar gob side entry of mud rock class roof is in the working face extraction period, and the tunnel warp seriously, and roof integrality is poor, and country rock self bearing capacity is low, influences the normal use in tunnel to have the impact danger that can be serial, consequently adopt reasonable effectual advance support mode, guarantee the steadiness of extraction tunnel in the service period, have important meaning to the safe high-efficient exploitation of working face.
At present, a working face advance support mode mainly adopts two passive support modes of a single hydraulic support matched with a hinged top beam and an advance hydraulic support; the support force of the single hydraulic support matched with the hinged top beam is low, the stability of the single hydraulic support matched with the hinged top beam is poor, the labor intensity of workers is high, and the stability of the single hydraulic support matched with the hinged top beam is poor; the fore hydraulic support repeatedly supports the top plate to cause the top plate to be broken seriously, so that the original supporting structure is invalid and is not suitable for long-distance supporting. And above two kinds all belong to passive form supporting mode, can only bear the weight of tunnel country rock surface, can not in time provide corresponding holding power to the tunnel destruction initial stage, lead to the supporting construction in initial stage to become invalid very easily, lead to tunnel plastic zone and broken zone further to enlarge to this kind of supporting mode influences the tunnel pedestrian, ventilates and transports, in the very big degree, with working face production efficiency, has delayed the operating efficiency.
the Chinese patent with the patent number of 201811583423.5 and the patent name of 'a grouting anchor cable advance support method' discloses an advance support method, but can not be applied to small coal pillar gob-side roadways with mud rock roof. The existing active advance support mode is provided for the small coal pillar gob-side roadway with the mud-rock roof in the working face stoping period, the working environment of the working face is improved, the normal use of the roadway is guaranteed, the stability of the stoping roadway in the working face mining period is maintained, and the safe and efficient mining of the working face is guaranteed.
Disclosure of Invention
The invention aims to provide a gob-side roadway supporting structure and a gob-side roadway supporting method for small coal pillars on a mudstone roof, and solves the problems that the conventional gob-side roadway supporting structure for small coal pillars on a mudstone roof is low in construction efficiency, high in labor intensity of personnel and high in supporting cost.
In order to solve the technical problems, the invention adopts the following technical scheme:
The invention relates to a small coal pillar gob-side roadway supporting structure for a mud-rock roof, which comprises permanent supports arranged on a stoping roadway roof and two sides of the stoping roadway roof, wherein each permanent support comprises a steel bar mesh tightly attached to the stoping roadway roof, a plurality of anchor rod steel belts arranged on the outer sides of the steel bar meshes, a plurality of anchor rods vertically penetrating through the anchor rod steel belts and the steel bar meshes and an anchor rod tray arranged at the outer ends of the anchor rods, and the anchoring ends of the anchor rods are connected to the stoping roadway roof and the two sides of the stoping roadway; the anchor rod steel belts are arranged at intervals, and each anchor rod steel belt is provided with a plurality of anchor rods; grouting anchor cable steel belts or grouting anchor rod steel belts are arranged between two adjacent anchor rod steel belts, and the grouting anchor cable steel belts and the grouting anchor rod steel belts are alternately arranged; a plurality of grouting anchor cables are installed on the grouting anchor cable steel belt, the grouting anchor cables penetrate through the grouting anchor cable steel belt and enter the anchor cable holes, and grouting anchor cable trays are arranged at the outer ends of the grouting anchor cables; the grouting anchor rod is characterized in that a plurality of grouting anchor rods are installed on the grouting anchor rod steel belt, the grouting anchor rods penetrate through the grouting anchor rod steel belt to enter the anchor rod holes, and the outer ends of the grouting anchor rods are provided with grouting anchor rod trays.
Furthermore, each grouting anchor cable steel belt is provided with at least three grouting anchor cables.
Still further, the grouting anchor cable in the middle is arranged in the middle.
still further, each grouting anchor rod steel belt is provided with at least five grouting anchor rods.
still further, the grouting anchor rod in the middle is arranged in the middle.
a method for supporting a small coal pillar of a mud-rock roof along a hollow roadway comprises the following steps:
Determining at least one stoping roadway to be supported on a current stoping working face; permanent supports are arranged on the top plate and two sides of the mining roadway, the mining roadway is dug in advance and is subjected to permanent support in the tunneling process, and the mining roadway is subjected to grouting anchor cable advanced support on the basis of the original permanent supports in the mining process of a working face; the permanent support adopts anchor net combined support, and comprises a combined support structure consisting of a steel bar net, an anchor rod steel belt and anchor rods, wherein the steel bar net is tightly attached to the top plate of the roadway, the anchor rod steel belt is arranged on the outer side of the steel bar net, a plurality of anchor rods vertically penetrate through the anchor rod steel belt and the steel bar net, the anchoring ends of the anchor rods are connected to the top plate and two sides of the stoping roadway, and anchor rod trays are arranged at the outer ends of the anchor rods and are pre-tightened;
and secondly, supporting the stoping roadway in advance, constructing one row of grouting anchor rods on every two rows of anchor rods along the advancing direction on the top plate of the stoping roadway while stoping the stoping working face, constructing one row of grouting anchor rods on every two rows of anchor rods, constructing one row of grouting anchor rods or grouting anchor cables between every two adjacent rows of anchor rods, then performing high-pressure grouting on the grouting anchor rods or the grouting anchor cables, cementing the surrounding rocks within the anchoring range into a whole, grouting the shallow surrounding rocks by the grouting anchor rods to form a cementing structure within the range of the shallow surrounding rocks, grouting the deep surrounding rocks by the grouting anchor cables, suspending the shallow surrounding rocks, and improving the bearing capacity of the surrounding rocks of the stoping roadway.
furthermore, when the coal mining operation is carried out on the stope face, the advance support range of the stope roadway is synchronously pushed forwards along the stope direction, and the advance support distance in front of the stope face is always kept within a safety range.
And further, the grouting anchor cables and the grouting anchor rods are alternately arranged.
and furthermore, the grouting anchor rods in the middle are arranged in the middle, all the grouting anchor rods move towards one line, and not less than five grouting anchor rods in each row are arranged.
and furthermore, the middle grouting anchor cables are arranged in the middle, all the grouting anchor cables move towards one line, and the number of the grouting anchor cables in each row is not less than three.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention adopts the grouting anchor rod and the grouting anchor rod to support in a combined manner, so that a combined arch and anchor rod compression area is formed, and the roadway supporting performance and the self-bearing capacity are improved. The grouting anchor rod performs grouting filling on the hole cracks of the shallow mudstone top plate, further development of the joint cracks is effectively inhibited, and a section of effective bearing structure is formed in the shallow part. The grouting anchor cable is anchored at the deep part to stabilize the coal rock mass, and plays a suspension role in shallow bearing, so as to form a suspension top beam in a local range. And the grout of slip casting stock and slip casting anchor rope effectively fills and can effectively restrain the damage weakening effect of wind and water to the mudstone roof, guarantee the integrality of roof structure, make the ground body become high, impervious performance is good, high new construction body of stability thereby reach the purpose of improving ground body physical and mechanical properties, and can prevent the further development in broken area of country rock and the plastic zone of country rock, improve the intensity and the self bearing capacity of country rock fundamentally, and the initiative supporting action of slip casting stock and slip casting stock can carry out the reinforcement of country rock before the original supporting construction of tunnel takes place the damage and destroys, guaranteed the complete structure and the bearing capacity of original support. The bearing capacity is provided at the early stage of the damage. And the supporting efficiency is high, the effective operation area of the roadway is increased, the labor intensity of workers is low, and the ventilation efficiency and the transportation efficiency are improved. Therefore, the combined active advanced support method of the grouting anchor rods and the grouting anchor cables has important theoretical significance and engineering practice value for the small coal pillar gob-side roadway with the mud-rock roof.
The invention has the beneficial technical results that: firstly, the supporting efficiency is greatly improved while the safe recovery is ensured; the space area of a stoping roadway is greatly saved; simple structure, convenient operation, low cost and low labor intensity of workers.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
FIG. 1 is a pictorial illustration of a stope face in the practice of a first embodiment of the invention;
3 fig. 3 2 3 is 3 a 3 sectional 3 view 3 A 3- 3 A 3 ( 3 the 3 support 3 of 3 the 3 mining 3 roadway 3 shown 3 in 3 the 3 schematic 3 diagram 3 is 3 only 3 a 3 forepoling 3 structure 3) 3; 3
Fig. 3 is an expanded view of a mudstone roof small coal pillar along a supporting plane of a roadway in the implementation of the first embodiment of the invention;
FIG. 4 is a sectional view of a support of a gob-side roadway with small pillars of a mudstone roof in the implementation of the first embodiment of the present invention;
Description of reference numerals: 1. stoping the roadway; 2. a coal rock mass; 3. stoping the working face; 4. a gob; 5. a coal pillar; 6. grouting an anchor cable; 7. an anchor rod; 8. an anchor rod tray; 9. grouting an anchor rod, 10, and an anchor rod steel belt; 11. grouting an anchor cable steel belt; 12. grouting an anchor cable tray; 13. grouting the anchor rod steel belt; 14. grouting the anchor rod tray;
The '1 stoping roadway' is a small mudstone roof coal pillar gob-side roadway in the implementation of the invention.
Detailed Description
Fig. 1 and 2 show the position relationship among a stoping roadway 1, a coal rock mass 2, a stoping face 3, a goaf 4 and a coal pillar 5, when the stoping face 3 carries out coal mining operation, the combined active advance support of a grouting anchor rod and a grouting anchor rope is carried out within a certain distance along the working face advancing direction of the stoping roadway 1, the advancing support range of the stoping roadway 1 is synchronously advanced along the stoping direction, and the advance support distance in front of the stoping face 3 is always kept within a safe range.
As shown in fig. 3 and 4, in the first embodiment of the supporting structure of the small coal pillar gob-side roadway with the shale roof, permanent supports are installed on the roof and two sides of the mining roadway 1, the mining roadway is dug in advance and is permanently supported in the tunneling process, and the mining roadway is subjected to grouting anchor rope advanced support on the basis of the original permanent supports in the mining process of the working face. The permanent support comprises a reinforcing mesh (prior art, not shown in the figure) tightly attached to the top plate of the stoping roadway, a plurality of anchor rod steel belts 10 and a plurality of anchor rod trays 8, wherein the anchor rod steel belts 10 and the anchor rods 7 of the reinforcing mesh penetrate through the outside of the reinforcing mesh, the anchor rod trays 8 are installed at the outer ends of the anchor rods 7 and are pre-tightened by adopting locks, and the anchoring ends of the anchor rods 7 are connected to the top plate and two sides of the stoping roadway 1. And the anchor rod steel belts are arranged at intervals, and each anchor rod steel belt is provided with a plurality of anchor rods. In the embodiment, six anchor rods 7 are fixed on each anchor rod steel belt 10 of the top plate of the mining roadway 1, an anchor rod tray 8 is installed on each anchor rod 7 and is pre-tightened by a lockset, and two anchor rods on the two sides of the six anchor rods 7 incline towards the two sides respectively. Three anchor rods 7 are fixed on each anchor rod steel belt 10 on two sides of the stoping roadway 1, an anchor rod tray 8 is installed on each anchor rod 7, and a lockset is adopted for pre-tightening, wherein the three anchor rods are parallel. And a grouting anchor rope steel belt 11 or a grouting anchor rod steel belt 13 is fixed between every two adjacent anchor rod steel belts 10, and the grouting anchor rope steel belts 11 and the grouting anchor rod steel belts 13 are alternately arranged. And a plurality of grouting anchor cables are arranged on the grouting anchor cable steel belt, the grouting anchor cables penetrate through the grouting anchor cable steel belt to enter the anchor cable holes, and grouting anchor cable trays are arranged at the outer ends of the grouting anchor cables and are pre-tightened by adopting a lockset. In this specific embodiment, three grouting anchor cables are fixed to each grouting anchor cable steel belt, and the middle grouting anchor cable is arranged in the middle. A plurality of grouting anchor rods 9 are installed on the grouting anchor rod steel belts 13, the grouting anchor rods 9 penetrate through the grouting anchor rod steel belts 13 to enter anchor rod holes, grouting anchor rod trays 14 are installed at the outer ends of the grouting anchor rods 9, and a lockset is adopted for pre-tightening. In this embodiment, each grouting anchor rod steel belt is provided with five grouting anchor rods, and the middle grouting anchor rod is arranged in the middle.
The invention provides an active advanced support mode based on the combination of a grouting anchor cable and a grouting anchor rod on the basis of permanent support during excavation of an exploitation roadway aiming at a small coal pillar gob-side roadway with a mud-rock roof. The forepoling method is realized through the following steps:
When the coal mining operation is carried out on the stoping face 3, the combined active advance support of the grouting anchor rods 9 and the grouting anchor cables 6 is carried out in a certain distance along the advancing direction of the working face of the stoping roadway 1, the advance support range of the stoping roadway 1 is synchronously advanced along the stoping direction, and the advance support distance in front of the stoping face 3 is always kept within a safe range.
On the basis of the original permanent support of the stoping roadway, the original permanent support comprises a combined support structure consisting of a metal net, a steel belt and anchor rods, wherein the metal net is tightly attached to the surface of the roadway, the steel belt is arranged on the outer side of the metal net, and a plurality of anchor rods penetrate through the steel belt and the metal net to be anchored in a top plate of the roadway. Along with the extraction of the working face, a grouting anchor rod and a grouting anchor rope are matched with a steel belt, a pre-support section of an extraction roadway is supported, the grouting anchor rod performs grouting reinforcement on shallow broken surrounding rocks, the surrounding rocks are cemented into a whole, the anti-damage capability of rocks is improved, and the bearing capacity of the shallow surrounding rocks is improved. The grouting anchor cable reinforces the deep surrounding rock, improves the bearing capacity of the deep surrounding rock and plays a suspension role in the grouting anchor rod anchoring area of the shallow part. The stability of the surrounding rock of the roadway during the stoping period is guaranteed, the normal operation of pedestrian, ventilation and transportation mining activities is guaranteed, and the safe and efficient mining of the working face is guaranteed.
A second specific embodiment of a small coal pillar gob-side roadway supporting structure with a shale roof is characterized in that grouting anchor cables and grouting anchor rods on the two sides are obliquely arranged, the inclination angle is 15-30 degrees, the lengths of the grouting anchor cables and the grouting anchor rods on the two sides are lengthened, and the anchoring strength is improved. Other technical features are the same as those described above and are not described herein again.
The invention is realized by the following technical scheme.
The method comprises the following steps: selecting a proper stope face, selecting a certain or several stope roadways which have the original permanent support, and carrying out the permanent support in the excavation process because the stope roadways are dug in advance, and carrying out the advance support of grouting anchor cables on the stope roadways on the basis of the original permanent support in the stope process of the face. According to geological profile and production technical conditions, determining the advanced support pressure distribution rule and the maximum safe distance of advanced support of the mining roadway, and determining the advanced support technical scheme of grouting anchor cables of the mining roadway by adopting methods such as theoretical calculation, numerical simulation and engineering analogy.
Step two: and carrying out advanced support on the stoping roadway. When the stoping working face 3 carries out stoping, anchor cable holes are constructed on the top plate of the stoping roadway 1 along the advancing direction at intervals of two rows of anchor rods 7, while the anchor cable holes are constructed, grouting anchor cables 6 and grouting anchor cable trays 12 are installed in the anchor cable holes, a lockset is adopted for pre-tightening, and grouting anchor cable steel belts 11 are fixed on the grouting anchor cables in the same row. And at least three grouting anchor cables are arranged in each row, the middle grouting anchor cable is arranged in the middle, and all the grouting anchor cables run towards one line. And anchor rod holes are constructed on every two rows of anchor rods 7, while the anchor rod holes are constructed, grouting anchor rods 9 and grouting anchor rod trays 14 are installed in the anchor rod holes, a lockset is adopted for pre-tightening, and grouting anchor rod steel belts 13 are fixed on the grouting anchor rods in the same row. Every row of grouting anchor rods is not less than five, the middle grouting anchor rods are arranged in the middle, and all the grouting anchor rods are arranged in one line. The grouting anchor cables 6 and the grouting anchor rods 9 are alternately arranged. And after the grouting anchor cable 6 and the grouting anchor rod 9 are installed, grouting the cracks of the top plate by using the grouting anchor cable by using a high-pressure pump, sealing the grouting anchor cable after grouting operation is finished, filling the gaps and the hole bodies of the broken top plate, and cementing the top plate of the stoping roadway into a whole. The grouting anchor rod performs grouting on the shallow surrounding rock to form a cementing structure in the range of the shallow surrounding rock, the grouting anchor cable performs grouting on the deep surrounding rock, the shallow surrounding rock is suspended, and the bearing capacity of the roadway surrounding rock is improved.
more specifically, along the direction of propulsion of the working face, appear in proper order according to stock, slip casting stock, slip casting anchor rope, stock, slip casting stock. And in the stoping roadway, constructing a grouting anchor rod and a grouting anchor cable according to design requirements, so that the advance support distance of the stoping roadway is always kept within a safety range.
The grouting anchor rod 9 and the grouting anchor cable 6 play multiple roles in extrusion reinforcement, multi-layer combined arch, grouting and the like; the strength of the rock mass is improved, the top plate is reinforced secondarily, the surrounding rock is taken as a part of the supporting structure and forms a whole with the original rock, and the stoping roadway 1 is kept stable and is not easy to damage.
In the second specific embodiment of the method, in the second step, the grouting anchor cables and the grouting anchor rods on the two sides are obliquely arranged when the extraction roadway is subjected to advance support, the inclination angle is 15-30 degrees, and the lengths of the grouting anchor cables and the grouting anchor rods on the two sides are lengthened. Other method steps are the same as above, and are not described herein again.
Note: grouting anchor cables need to be additionally arranged in a geological structure abnormal zone, a certain number of single supporting columns need to be prepared in a stoping roadway, and the single supporting columns are adopted for reinforcing and supporting aiming at severe deformation of surrounding rocks of the roadway, so that safe and efficient production is guaranteed.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (10)
1. The utility model provides a little coal pillar gob entry supporting construction of mud rock class roof which characterized in that: the mining roadway support comprises permanent supports arranged on a top plate and two sides of a mining roadway, wherein each permanent support comprises a steel bar mesh tightly attached to the top plate of the mining roadway, a plurality of anchor rod steel belts arranged outside the steel bar meshes, a plurality of anchor rods vertically penetrating through the anchor rod steel belts and the steel bar meshes and an anchor rod tray arranged at the outer end of each anchor rod, and the anchoring ends of the anchor rods are connected to the top plate and two sides of the mining roadway; the anchor rod steel belts are arranged at intervals, and each anchor rod steel belt is provided with a plurality of anchor rods; grouting anchor cable steel belts or grouting anchor rod steel belts are arranged between two adjacent anchor rod steel belts, and the grouting anchor cable steel belts and the grouting anchor rod steel belts are alternately arranged; a plurality of grouting anchor cables are installed on the grouting anchor cable steel belt, the grouting anchor cables penetrate through the grouting anchor cable steel belt and enter the anchor cable holes, and grouting anchor cable trays are arranged at the outer ends of the grouting anchor cables; the grouting anchor rod is characterized in that a plurality of grouting anchor rods are installed on the grouting anchor rod steel belt, the grouting anchor rods penetrate through the grouting anchor rod steel belt to enter the anchor rod holes, and the outer ends of the grouting anchor rods are provided with grouting anchor rod trays.
2. the mudstone roof small coal pillar gob-side roadway support structure according to claim 1, characterized in that: and at least three grouting anchor cables are arranged on each grouting anchor cable steel belt.
3. The mudstone roof small coal pillar gob-side roadway support structure according to claim 2, characterized in that: the grouting anchor cable in the middle is arranged in the middle.
4. The mudstone roof small coal pillar gob-side roadway support structure according to claim 1, characterized in that: and at least five grouting anchor rods are arranged on each grouting anchor rod steel belt.
5. The mudstone roof small coal pillar gob-side roadway support structure according to claim 4, characterized in that: the middle grouting anchor rod is arranged in the middle.
6. A method for supporting a small coal pillar of a mud-rock roof along a hollow roadway is characterized by comprising the following steps: the method comprises the following steps:
Determining at least one stoping roadway to be supported on a current stoping working face; permanent supports are arranged on the top plate and two sides of the mining roadway, the mining roadway is dug in advance and is subjected to permanent support in the tunneling process, and the mining roadway is subjected to grouting anchor cable advanced support on the basis of the original permanent supports in the mining process of a working face; the permanent support adopts anchor net combined support, and comprises a combined support structure consisting of a steel bar net, an anchor rod steel belt and anchor rods, wherein the steel bar net is tightly attached to the top plate of the roadway, the anchor rod steel belt is arranged on the outer side of the steel bar net, a plurality of anchor rods vertically penetrate through the anchor rod steel belt and the steel bar net, the anchoring ends of the anchor rods are connected to the top plate and two sides of the stoping roadway, and anchor rod trays are arranged at the outer ends of the anchor rods and are pre-tightened;
And secondly, supporting the stoping roadway in advance, constructing one row of grouting anchor rods on every two rows of anchor rods along the advancing direction on the top plate of the stoping roadway while stoping the stoping working face, constructing one row of grouting anchor rods on every two rows of anchor rods, constructing one row of grouting anchor rods or grouting anchor cables between every two adjacent rows of anchor rods, then performing high-pressure grouting on the grouting anchor rods or the grouting anchor cables, cementing the surrounding rocks within the anchoring range into a whole, grouting the shallow surrounding rocks by the grouting anchor rods to form a cementing structure within the range of the shallow surrounding rocks, grouting the deep surrounding rocks by the grouting anchor cables, suspending the shallow surrounding rocks, and improving the bearing capacity of the surrounding rocks of the stoping roadway.
7. The mudstone roof small coal pillar gob-side roadway support method according to claim 6, characterized in that: and simultaneously advancing the advance support range of the stoping roadway along the stoping direction while carrying out coal mining operation on the stoping working face, and always keeping the advance support distance in front of the stoping working face within a safety range.
8. The mudstone roof small coal pillar gob-side roadway support method according to claim 6, characterized in that: and the grouting anchor cables and the grouting anchor rods are alternately arranged.
9. The mudstone roof small coal pillar gob-side roadway support method according to claim 6, characterized in that: the grouting anchor rods in the middle are arranged in the middle, all the grouting anchor rods move towards one line, and not less than five grouting anchor rods in each row.
10. The mudstone roof small coal pillar gob-side roadway support method according to claim 6, characterized in that: the middle grouting anchor cables are arranged in the middle, all the grouting anchor cables move towards one line, and the number of the grouting anchor cables in each row is not less than three.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910918212.0A CN110566238A (en) | 2019-09-26 | 2019-09-26 | Mud rock roof small coal pillar gob-side roadway supporting structure and method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910918212.0A CN110566238A (en) | 2019-09-26 | 2019-09-26 | Mud rock roof small coal pillar gob-side roadway supporting structure and method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN110566238A true CN110566238A (en) | 2019-12-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910918212.0A Pending CN110566238A (en) | 2019-09-26 | 2019-09-26 | Mud rock roof small coal pillar gob-side roadway supporting structure and method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112610258A (en) * | 2020-12-09 | 2021-04-06 | 中国矿业大学 | Impact mine stoping roadway advanced support method applied to smart mine |
| CN113279795A (en) * | 2021-06-29 | 2021-08-20 | 辽宁工程技术大学 | Drilling, anchoring, digging and repairing rapid tunneling construction process method |
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| CN114000902A (en) * | 2021-09-22 | 2022-02-01 | 中国矿业大学(北京) | Method for maintaining broken top plate of negative coal pillar roadway by grouting reinforcement anchor rod suspension |
| CN114000902B (en) * | 2021-09-22 | 2022-12-27 | 中国矿业大学(北京) | Method for suspension maintenance of broken roof of negative coal pillar roadway by grouting reinforced anchor rod |
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