CN111411962A - Coal mine rock burst treatment method - Google Patents
Coal mine rock burst treatment method Download PDFInfo
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- CN111411962A CN111411962A CN202010175913.2A CN202010175913A CN111411962A CN 111411962 A CN111411962 A CN 111411962A CN 202010175913 A CN202010175913 A CN 202010175913A CN 111411962 A CN111411962 A CN 111411962A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
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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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/006—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries by making use of blasting methods
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
- E21F15/08—Filling-up hydraulically or pneumatically
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F16/00—Drainage
- E21F16/02—Drainage of tunnels
Abstract
The invention discloses a method for treating rock burst in coal mine pillar-free mining, which is particularly suitable for the technical field of coal mine engineering. And pouring concrete along the non-stoping side of the stoping roadway in the stoping process of the working face, constructing from the cutting hole to a stoping line along with the stoping to form a concrete wall, after the mine pressure of the goaf is stabilized, excavating the next working face stoping roadway along the concrete wall from the cutting hole, wherein the concrete wall is used as one side of the roadway, namely, the roadway is excavated along the goaf. The gob-side entry road is used as one of the mining roadways of the lower working face, and a mining roadway and the cutting hole are dug in addition to form the fully mechanized working face. The method has simple steps and good use effect, can not only realize the thorough treatment of rock burst in the non-pillar mining, but also improve the resource recovery rate, can also treat part of gangue, and has wide practicability.
Description
Technical Field
The invention relates to a coal mine rock burst treatment method, in particular to a coal mine rock burst treatment method which is suitable for mines with roadways affected by secondary mining on fully mechanized coal mining faces and prone to rock burst, and belongs to the technical field of coal mine engineering.
Background
With the gradual development of deep coal resources, rock burst disasters are increasingly aggravated, become main disaster forms which seriously restrict safe and efficient mining of coal mines, and also become hot spots for the mining community to pay attention to and develop research work widely, but the rock burst disasters are still worldwide problems at present, and a practical and effective treatment method is urgently needed to be found.
At present, coal mine rock burst disasters such as Shilazu, Mengkqing, Hongqing river, cucurbitacin and the like newly buried mines in the west of an Ore region occur in a range within 120m of an advanced fully mechanized mining working face of a roadway influenced by secondary mining without exception, and the disasters mainly include sudden expansion of two sides, a top plate and a bottom plate of the roadway, support damage, serious reduction of a section, partial incapability of entering and even unsmooth ventilation of the working face.
For a long time, all the students in the world try to explain the generation of coal mine rock burst in principle, and successively put forward a series of important theories to explain the generation mechanism, wherein the theories mainly comprise a strength theory, a rigidity theory, an energy theory, an impact tendency theory, a three-criterion theory, a deformation system instability theory and the like. These have studied the conditions and mechanisms of rock burst development from different perspectives, but each theory has its own characteristics and limitations. On the basis of full reference and absorption, domestic experts consider that the rock burst process is a mechanical process of coal rock fracture in 1985 by a rock burst research group consisting of the original compliant Ministry of mines and the Fuxin Ministry of mining industry, the coal rock local area bears the ultimate load, deformation is localized, and the original microcracks penetrate into macroscopic macrocracks and are the result of large rack expansion instability. Ziqingxin et al further propose a "three-factor" mechanism model, i.e. intrinsic factors (impact tendency of coal rock), force source factors (high stress concentration or storage of high deformation energy and external dynamic disturbance) and structural factors (layered interfaces with weak structural planes and easy to cause abrupt sliding) are the most main factors causing rock burst to occur. The prevention and control technology can be mainly divided into 3 types, and the 1 st type is a regional prevention method (including optimization development arrangement, liberation layer exploitation, coal pillar-free exploitation, coal seam water injection and the like); the 2 nd type is an active danger-relieving method (including deep hole blasting, unloading blasting, hydraulic fracturing, large hole pressure relief and the like); the 3 rd method is a reinforced support method, and adopts a mode of combining active support and passive support and matching rigid support and flexible support according to a 'strong and weak' structure of surrounding rock of a roadway, namely, the support strength is increased or the support mode is improved to improve the impact resistance of the surrounding rock.
In the Ordos area, from 2016 Bayangher coal mine, rock burst is treated by 'roof cutting pressure relief' active danger relieving method, and the surrounding coal mines such as Shilazurisu, Mengkqing, Hongqing river are all simulated. At present, each ore first mining panel area has mined 2-3 working faces, and except the first mining working face, a continuous working face has no serious rock burst hidden danger.
Unfortunately, no example of a problem solving using this method is found in local areas, which are still the standard answer to the present day. The reality forces us to go through the deep thinking and reevaluating of the 'roof cutting pressure relief' treatment method fundamentally.
The theoretical basis of the 'roof cutting and pressure relief' treatment method for rock burst is that ① transfers stress to the deep part to reduce stress concentration of an adjacent roadway area, ② forms a strong-weak-strong surrounding rock stress structure from the roadway wall to the deep part so as to be beneficial to shock prevention, ③ changes the mechanical property of surrounding rock of the roadway to soften the surrounding rock so as to reduce the shock tendency of the surrounding rock, and ④ forms pressure relief spaces on two sides of the roadway so as to be beneficial to absorbing energy of the rock burst.
This theory has a congenital deficiency. The coal-series stratum is a layered structure and has extremely uneven components and mechanical properties. Rock mass is formed after long geological history, is in a certain natural stress state and in geological environments such as underground water and the like, and is subjected to two major functions of complex geological construction and reconstruction for a long time, so that structural surfaces of various types and scales, such as faults, joints, bedding, lamellas, cracks and the like, are generated. The structural surfaces are intersected to form a unique cleavage structure [15 ]. The compression capacity of rock mass is far greater than the tension capacity, generally 10 times. The deep rock mass is in a three-way stress state before mining influence, and the inside of the deep rock mass is expressed as compressive stress (tensile stress is not measured hitherto). The precondition for rock mass destruction is that a space is formed first, so that compression is converted into tension or shear [16 ].
① rock mass has many soft structural surfaces, and even many cracks can not change the stress condition, for example, 2-1 coal seam of calabash coal mine, 6-8 vertical cracks are observed by naked eyes every 10cm along the bedding direction, most cracks are filled by calcite pulse, ② cracks occurring no matter blasting or hydraulic cracking do not affect the transmission of compressive stress, so that the reduced stress concentration cannot be achieved, ③ has no enough degree of freedom due to the fact that the hole cracking has very small influence radius which is not more than 2m, and the strong-weak-strong buffer structure is greatly reduced, ④ treated coal seam and surrounding rock still show more brittleness instead of soft slope, and the absorption of deformation and ground pressure energy by two drilling holes ⑤ is only small, and the blocking arms are completely mantis blocking arms when strong impact is encountered.
Deep coal mine pressure can "seek" the weakest point to release. The key to the success of the working face in managing the roof by adopting the all-span method is that the mine pressure is released in the goaf as early as possible, and the release is less before the working face. However, after the top cutting and pressure relief are carried out on the roadway, the integrity of surrounding rocks is damaged, so that the supporting capacity is reduced, and the strong mine pressure is easy to be brought out, which is proved by a large amount of practice. The most obvious situation is that when the working face of the cucurbitacin coal mine 21102 is mined at the end and is 110m away from a mining stop line, the pressure is advanced to crush about half of the pre-supported cement columns (the diameter is 0.8m, the spacing is 2.0m, and nearly 150 cement columns) of the main withdrawal channel. Coincidentally, the roadway has performed roof cutting pressure relief work in advance, but never occurred in surrounding mine work surfaces that were not performed.
In summary, a treatment technology is particularly needed to solve the defects that the prior art cannot really treat the rock burst of the deeply buried coal mine, so as to solve the defects of the prior art.
Disclosure of Invention
Aiming at the defects of the prior art, the coal mine rock burst cannot be effectively treated, the invention provides the method for treating the coal mine rock burst by soft mold protection side gob-side entry driving coal-pillar-free mining, the design is novel, the rock burst can be completely treated by coal-pillar-free mining, the resource recovery rate can be improved, and a large part of gangue can be treated.
In order to achieve the purpose, the invention 1 discloses a coal mine rock burst treatment method, which comprises the following steps:
a. filling and pouring concrete along the non-stoping side of the stoping roadway, namely a corner area, in the mining process of the working face, and filling and pouring a side wall from a cutting hole along with the stoping till the stoping is stopped, so that a concrete wall is formed;
b. after the mine pressure of the working face goaf is stabilized, a next working face stoping roadway is excavated along a concrete wall from the cutting hole of the working face on the coal seam of the non-mining area to form a gob-side entry-excavating roadway, and the concrete wall is one side of the roadway;
c. taking the gob-side entry driving as one of the mining roadways of the working face, and digging a mining roadway and a cutting hole in addition to form a fully mechanized mining working face;
d. when the working face is mined, the steps a to c are additionally carried out to realize the non-pillar mining and the rock burst treatment.
The concrete construction steps are as follows:
a1. when a working face stoping roadway is tunneled, a row of constant-resistance anchor cables are constructed along a top plate on the non-stoping side to reduce the influence of mining, and the completeness of the top plate is ensured;
a2. arranging a row of blasting holes along the middle part of a roadway roof during stoping of the working face, charging the blasting holes, detonating before a stoping support of the working face to enable blasting cut top to occur behind the working face, and forming a cut top line penetrating through the whole roadway in the middle of the roadway roof to ensure the integrity of the pedestrian side roof of the roadway and reduce subsidence;
a3. binding a transverse grouting pipe every 10m on a top plate on the non-stoping side of the roadway by using a top net, wherein one end of the transverse grouting pipe points to the roadway side, the other end of the transverse grouting pipe points to a goaf,
a4. laying a transverse drain pipe at a low-lying position of the bottom plate, wherein two ends of the drain pipe are communicated with a roadway side and a goaf and used for draining the goaf;
a5. before stoping of the working face, a flexible mold is well adhered and hung along the upper part of the bracket on the non-stoping side of the roadway, and meanwhile, the movement of the working face equipment is ensured not to be influenced,
a6. arranging a movable grouting station in a roadway in front of a working face, inputting prepared concrete slurry into a flexible mold by using a grouting pipe until a crown is fully filled with the slurry to be connected with the top, waiting for the concrete slurry to be solidified to form a flexible mold concrete wall connected with a stoping roadway, and isolating the flexible mold concrete wall from a goaf during gob-side entry driving and providing a roof support;
a7. the movable support is pushed along with the working face, and after the movable support moves, the flexible formwork concrete is poured in the fifth step and the sixth step repeatedly to form a supporting concrete wall until the supporting concrete wall is full of concrete;
a8.: after the mine pressure of the goaf of the working face is stabilized, a stoping roadway of the next working face is excavated from the cutting hole along the concrete wall by the solid coal, and the concrete wall is used as one side of the roadway;
s9. when driving roadway along the goaf, digging out the hole on the top of concrete wall to fill the goaf with the movable grouting vehicle and the transverse grouting pipe, further reinforcing the concrete wall, and inhibiting the harmful gas from gushing out.
The method comprises the following steps when no water is accumulated in the corner construction area:
b1. 2 grouting steel pipes are preset on a non-stoping side, namely a pedestrian side top plate, of the front edge of the working face in the stoping roadway close to the next working face; the grouting steel pipes are directly tied on a top plate supporting steel bar net by iron wires, and the two grouting steel pipes are alternately arranged side by side;
b2. a mobile concrete delivery pump is arranged in the advanced working face area of the roadway and is connected with a first step top plate preset pipeline through a pipeline;
b3. and (5) pulping by using a concrete conveying pump, and conveying pouring concrete to the corner area of the goaf to form the concrete wall.
The row of constant-resistance anchor cables are vertically driven into the top plate, the distance between the row of constant-resistance anchor cables and the non-extraction side edge is 1.5m, and other supporting forms are unchanged.
The distance between the blast holes is 12-15m, the elevation angle is 25 degrees, the blast holes project to the plane parallel to the roadway, the blast holes are drilled from 100-500m in front of the working face, the diameter of each blast hole is 75mm, the depth of each blast hole is 30-35m, the blasting explosive quantity is 40 Kg/hole, and the blasting time is 2-5m in front of the support top beam.
The pulping aggregate of the concrete slurry is crushed gangue with the particle size of 5-10 mm, and the concrete slurry is prepared from cement, aggregate, sand, an accelerator and water in a mass mixing ratio of 0.141:0.45:0.312:0.001: 0.096.
Each section of flexible mold is 10m in length and 1.0m in width, a grouting opening is reserved at the upper part of the outer side of the working face, and no gap is reserved between the flexible molds.
Need block up one more time along the top after just pouring after gentle mould concrete wall construction is accomplished to guarantee the sealed effect of roof that meets of gentle mould concrete wall, guarantee simultaneously that the time interval of the gentle mould of pouring in blasting topping and the sixth step in the second step exceeds 1 hour.
When a next working face stoping roadway is tunneled in the later stage, concrete is poured into the goaf after a grouting pipe is exposed every 10m of tunneling, the grouting pipe is a DN108 steel pipe and is 1.4m long, the next working face is formed in the later stage, grouting is carried out on the goaf of the working face during gob-side tunneling, so that the roadway side is reinforced, and harmful gas emission is inhibited.
In step s6, the goaf can be grouted by 2 grouting steel pipes arranged on the non-stoping side of the front edge of the working face, namely the pedestrian side roof, and pointing to the goaf, wherein each grouting steel pipe comprises two equal-length perforated pipes and seamless steel pipes, the lengths of the perforated pipes and the seamless steel pipes are consistent with the caving of the goaf, the perforated pipes of one grouting steel pipe are arranged above the goaf during arrangement, the seamless steel pipes are arranged above the working face, the perforated pipes of the other grouting steel pipe are arranged above the working face, and the two grouting steel pipes are arranged alternately, so that grouting can be performed at any point along the roadway, and only one grouting steel pipe is connected with the mobile grouting pump at each time.
The slip casting steel pipe adopts DN219, the length of each perforated pipe is 10 meters, the length of the common seamless steel pipe is 10 meters, the perforated pipes and the common seamless steel pipe are connected through screw threads, and a gap is left between the perforated pipes and the next seamless steel pipe by 0.5 m.
If the situation that concrete slurry easily flows back to the working face when the working face goes down the slope is met, a sand bag needs to be stacked between the first hydraulic support and the roadway side in the corner area for blocking, and meanwhile, a flexible baffle is welded at the tail part of the shield beam of the end frame and is drooped to the bottom plate for blocking the backflow of the concrete slurry; the filling and building side is not supported, the top plate and the other side are supported by using a full-length anchoring anchor net cable, and Mary's powder reinforcing materials are used, and the depth is less than 6 meters.
Has the advantages that:
the invention can effectively treat the rock burst after the coal pillar-free mining by utilizing the anchor rod and the grouting pipe, ensures the safe mining of coal mines, simultaneously realizes the coal pillar-free mining and improves the resource recovery rate, and can also treat part of gangue to prevent the gangue from going into the well. The economic benefit can be improved by 2.0 hundred million by measuring and calculating one working surface of the local area by the propelling length of 5000 meters and the coal mining thickness of 5.0 m. The method has the advantages of simple steps, low implementation cost and wide practicability.
Drawings
FIG. 1 is a schematic diagram of a multi-working-face mined-out goaf multi-span stacking arch model and stress;
FIG. 2 is a schematic diagram of a gob-side entry driving position of a flexible mold protection wall of the coal mine rock burst control method of the invention
FIG. 3 is a schematic diagram of a filling and side building gob-side entry driving position of the coal mine rock burst treatment method of the invention
Detailed Description
Embodiments of the invention are further described below with reference to the accompanying drawings:
as shown in figure 1, the coal mine rock burst treatment method of the invention comprises the following steps:
a. filling and pouring concrete along the non-stoping side of the stoping roadway, namely a corner area, in the mining process of the working face, and filling and pouring a side wall from a cutting hole along with the stoping till the stoping is stopped, so that a concrete wall is formed;
b. after the mine pressure of the working face goaf is stabilized, a next working face stoping roadway is excavated along a concrete wall from the cutting hole of the working face on the coal seam of the non-mining area to form a gob-side entry-excavating roadway, and the concrete wall is one side of the roadway;
c. taking the gob-side entry driving as one of the mining roadways of the working face, and digging a mining roadway and a cutting hole in addition to form a fully mechanized mining working face;
d. when the working face is mined, the steps a to c are additionally carried out to realize the non-coal-pillar mining and the rock burst treatment, when the next working face is mined, the mining roadway close to the 3 rd working face is filled with the building side to form a concrete wall, the roadway is excavated along the sky to form a lower working face, and no coal pillar is left between the working faces, so that the non-coal-pillar mining and the rock burst treatment are realized.
As shown in fig. 2, the concrete construction steps when water is accumulated in the corner construction area are as follows:
a1. when a working face stoping roadway is tunneled, a row of constant-resistance anchor cables are constructed along a top plate on the non-stoping side to reduce the influence of mining, and the completeness of the top plate is ensured; the row of constant-resistance anchor cables are vertically driven into the top plate, 1.5m is away from the edge of the non-extraction side, and other supporting forms are unchanged;
a2. arranging a row of blasting holes along the middle part of a roadway roof during stoping of the working face, charging the blasting holes, detonating before a stoping support of the working face to enable blasting cut top to occur behind the working face, and forming a cut top line penetrating through the whole roadway in the middle of the roadway roof to ensure the integrity of the pedestrian side roof of the roadway and reduce subsidence; the distance between the blast holes is 12-15m, the elevation angle is 25 degrees, the blast holes are projected to the plane and are parallel to the roadway, the blast holes are drilled from 100-500m in front of the working face, the diameter of each blast hole is 75mm, the depth of each blast hole is 30-35m, the blasting explosive quantity is 40 Kg/hole, and the blasting time is 2-5m in front of the top beam of the support;
a3. binding a transverse grouting pipe every 10m on a top plate on the non-stoping side of the roadway by using a top net, wherein one end of the transverse grouting pipe points to the roadway side, the other end of the transverse grouting pipe points to a goaf,
a4. laying a transverse drain pipe at a low-lying position of the bottom plate, wherein two ends of the drain pipe are communicated with a roadway side and a goaf and used for draining the goaf;
a5. before stoping of a working face, a flexible mold is well attached and hung along the upper side of a support on the non-stoping side of the roadway, and meanwhile, the movement of equipment on the working face is not influenced, each section of flexible mold is expanded to be 10m in length and 1.0m in width, a grouting opening is reserved at the upper part of the outer side of the working face, and no gap is reserved between the flexible molds; after the construction of the flexible mold concrete wall is finished, the edge top is plugged once again after the concrete wall is just poured so as to ensure the top-contacting sealing effect of the flexible mold concrete wall, and simultaneously ensure that the time interval between the blasting top-cutting in the second step and the pouring of the flexible mold in the sixth step exceeds 1 hour;
a6. arranging a movable grouting station in a roadway in front of a working face, inputting prepared concrete slurry into a flexible mold by using a grouting pipe until a crown is fully filled with the slurry to be connected with the top, waiting for the concrete slurry to be solidified to form a flexible mold concrete wall connected with a stoping roadway, and isolating the flexible mold concrete wall from a goaf during gob-side entry driving and providing a roof support; when a next working face stoping roadway is tunneled in the later period, after a grouting pipe is exposed every 10m of tunneling, concrete is poured into a goaf, the grouting pipe is a DN108 steel pipe and is 1.4m long, the next working face is formed in the later period, grouting is carried out on the goaf of the working face during gob-side tunneling, so that the roadway side is reinforced, and harmful gas emission is inhibited;
a7. the movable support is pushed along with the working face, and after the movable support moves, the flexible formwork concrete is poured in the fifth step and the sixth step repeatedly to form a supporting concrete wall until the supporting concrete wall is full of concrete;
a8.: after the mine pressure of the goaf of the working face is stabilized, a stoping roadway of the next working face is excavated from the cutting hole along the concrete wall by the solid coal, and the concrete wall is used as one side of the roadway;
a9. when the roadway is excavated along the goaf, holes for accommodating the transverse grouting pipes are dug out from the top of the concrete wall, the movable grouting vehicle and the transverse grouting pipes are utilized to grout the goaf, the concrete wall is further reinforced, and harmful gas is inhibited from flowing out.
As shown in fig. 3, the steps when there is no water in the corner construction area are as follows:
b1. 2 grouting steel pipes pointing to a goaf are preset on a top net of a top plate on the front non-stoping side, namely the pedestrian side, of a stoping roadway close to the next working face; the grouting steel pipes are directly tied on a top plate supporting steel bar net by iron wires, and the two grouting steel pipes are alternately arranged side by side;
b2. a mobile concrete delivery pump is arranged in the advanced working face area of the roadway and is connected with a first step top plate preset pipeline through a pipeline;
b3. and (5) pulping by using a concrete conveying pump, and conveying pouring concrete to the corner area of the goaf to form the concrete wall.
The pulping aggregate of the concrete slurry is crushed gangue with the particle size of 5-10 mm, and the concrete slurry is prepared from cement, aggregate, sand, an accelerator and water in a mass mixing ratio of 0.141:0.45:0.312:0.001: 0.096.
The grouting steel pipes comprise two floral tubes and seamless steel pipes which are equal in length, the lengths of the floral tubes and the seamless steel pipes are consistent with the caving of the goaf, the floral tubes of one grouting steel pipe are arranged above the goaf during arrangement, the seamless steel pipes are arranged above the working face, the floral tubes of the other grouting steel pipe are arranged above the working face, and the two floral tubes are arranged alternately, so that grout can be discharged from any point along the roadway, and only one grouting steel pipe is connected with the movable grouting pump each time; the slip casting steel pipe adopts DN219, the length of each perforated pipe is 10 meters, the length of the common seamless steel pipe is 10 meters, the perforated pipes and the common seamless steel pipe are connected through screw threads, and a gap is left between the perforated pipes and the next seamless steel pipe by 0.5 m.
If the situation that concrete slurry easily flows back to the working face when the working face goes down the slope is met, a sand bag needs to be stacked between the first hydraulic support and the roadway side in the corner area for blocking, and meanwhile, a flexible baffle is welded at the tail part of the shield beam of the end frame and is drooped to the bottom plate for blocking the backflow of the concrete slurry; the filling and building side is not supported, the top plate and the other side are supported by using a full-length anchoring anchor net cable, and Mary's powder reinforcing materials are used, and the depth is less than 6 meters.
As shown in figure 1, after the first working face in the deep mining mine plate area is mined, the formed arch is lower, after the 2 nd working face is mined, the three zones of the original first working face can be activated, the caving zone and the fractured zone can further develop upwards, and the stress arches of the 2 working faces can be overlapped and expanded to form a larger and higher arch. After a plurality of working faces of one panel are mined in sequence, a section is taken along the direction of the working faces to form a multi-span overlapping arch, one part of the pressure of the overlying strata is born by the underlying caving zone and the fracture zone, and the other part of the pressure of the overlying strata is supported by the coal pillar and the unexplored area.
Claims (10)
1. A coal mine rock burst treatment method is characterized by comprising the following steps:
a. filling and pouring concrete along the non-stoping side of the stoping roadway, namely a corner area, in the mining process of the working face, and filling and pouring a side wall from a cutting hole along with the stoping till the stoping is stopped, so that a concrete wall is formed;
b. after the mine pressure of the working face goaf is stabilized, a next working face stoping roadway is excavated along a concrete wall from the cutting hole of the working face on the coal seam of the non-mining area to form a gob-side entry-excavating roadway, and the concrete wall is one side of the roadway;
c. taking the gob-side entry driving as one of the mining roadways of the working face, and digging a mining roadway and a cutting hole in addition to form a fully mechanized mining working face;
d. when the working face is mined, the steps a to c are additionally carried out to realize the non-pillar mining and the rock burst treatment.
2. The coal mine rock burst treatment method as claimed in claim 1, wherein the concrete construction steps under the condition of accumulated water in the corner construction area are as follows:
a1. when a working face stoping roadway is tunneled, a row of constant-resistance anchor cables are constructed along a top plate on the non-stoping side to reduce the influence of mining, and the completeness of the top plate is ensured;
a2. arranging a row of blasting holes along the middle part of a roadway roof during stoping of the working face, charging the blasting holes, detonating before a stoping support of the working face to enable blasting cut top to occur behind the working face, and forming a cut top line penetrating through the whole roadway in the middle of the roadway roof to ensure the integrity of the pedestrian side roof of the roadway and reduce subsidence;
a3. binding a transverse grouting pipe every 10m on a top plate on the non-stoping side of the roadway by using a top net, wherein one end of the transverse grouting pipe points to the roadway side, the other end of the transverse grouting pipe points to a goaf,
a4. laying a transverse drain pipe at a low-lying position of the bottom plate, wherein two ends of the drain pipe are communicated with a roadway side and a goaf and used for draining the goaf;
a5. before stoping of the working face, a flexible mold is well adhered and hung along the upper part of the bracket on the non-stoping side of the roadway, and meanwhile, the movement of the working face equipment is ensured not to be influenced,
a6. arranging a movable grouting station in a roadway in front of a working face, inputting prepared concrete slurry into a flexible mold by using a grouting pipe until a crown is fully filled with the slurry to be connected with the top, waiting for the concrete slurry to be solidified to form a flexible mold concrete wall connected with a stoping roadway, and isolating the flexible mold concrete wall from a goaf during gob-side entry driving and providing a roof support;
a7. the movable support is pushed along with the working face, and after the movable support moves, the flexible formwork concrete is poured in the fifth step and the sixth step repeatedly to form a supporting concrete wall until the supporting concrete wall is full of concrete;
a8.: after the mine pressure of the goaf of the working face is stabilized, a stoping roadway of the next working face is excavated from the cutting hole along the concrete wall by the solid coal, and the concrete wall is used as one side of the roadway;
a9. when the roadway is excavated along the goaf, holes for accommodating the transverse grouting pipes are dug out from the top of the concrete wall, the movable grouting vehicle and the transverse grouting pipes are utilized to grout the goaf, the concrete wall is further reinforced, and harmful gas is inhibited from flowing out.
3. The coal mine rock burst treatment method as claimed in claim 1, wherein the steps are as follows when no water is accumulated in the corner construction area:
b1. 2 grouting steel pipes are preset on a non-stoping side, namely a pedestrian side top plate, of the front edge of the working face in the stoping roadway close to the next working face; the grouting steel pipes are directly tied on a top plate supporting steel bar net by iron wires, and the two grouting steel pipes are alternately arranged side by side;
b2. a mobile concrete delivery pump is arranged in the advanced working face area of the roadway and is connected with a first step top plate preset pipeline through a pipeline;
b3. and (5) pulping by using a concrete conveying pump, and conveying pouring concrete to the corner area of the goaf to form the concrete wall.
4. The coal mine rock burst treatment method according to claim 2, wherein: the row of constant-resistance anchor cables are vertically driven into the top plate, the distance between the row of constant-resistance anchor cables and the non-extraction side edge is 1.5m, and other supporting forms are unchanged.
5. The coal mine rock burst treatment method according to claim 2, wherein: the distance between the blast holes is 12-15m, the elevation angle is 25 degrees, the blast holes are projected to the plane and are parallel to the roadway, the blast holes are drilled from 100-500m in front of the working face, the diameter of each blast hole is 75mm, the depth of each blast hole is 30-35m, the blasting explosive quantity is 40 Kg/hole, and the blasting time is 2-5m in front of the top beam of the support; each section of flexible mold is expanded to be 10m in length and 1.0m in width, a grouting opening is reserved towards the upper part of the outer side of the working face, and no gap is reserved between the flexible molds; need block up one more time along the top after just pouring after gentle mould concrete wall construction is accomplished to guarantee the sealed effect of roof that meets of gentle mould concrete wall, guarantee simultaneously that the time interval of the gentle mould of pouring in blasting topping and the sixth step in the second step exceeds 1 hour.
6. The coal mine rock burst treatment method according to claim 1, wherein: the pulping aggregate of the concrete slurry is crushed gangue with the particle size of 5-10 mm, and the concrete slurry is prepared from cement, aggregate, sand, an accelerator and water in a mass mixing ratio of 0.141:0.45:0.312:0.001: 0.096.
7. The coal mine rock burst treatment method according to claim 2, wherein: when a next working face stoping roadway is tunneled in the later stage, concrete is poured into the goaf after a grouting pipe is exposed every 10m of tunneling, the grouting pipe is a DN108 steel pipe and is 1.4m long, the next working face is formed in the later stage, grouting is carried out on the goaf of the working face during gob-side tunneling, so that the roadway side is reinforced, and harmful gas emission is inhibited.
8. The coal mine rock burst treatment method according to claim 3, wherein: the goaf is grouted by 2 grouting steel pipes which are arranged on the top net and point to the goaf at the front non-stoping side of the working face, namely a pedestrian side top plate, the grouting steel pipes comprise two equal-length perforated pipes and seamless steel pipes, the lengths of the perforated pipes and the seamless steel pipes are consistent with the goaf caving, the perforated pipes of one grouting steel pipe are arranged above the goaf during arrangement, the seamless steel pipes are arranged above the working face, the perforated pipes of the other grouting steel pipe are arranged above the working face, the two grouting steel pipes are arranged alternately, therefore, grouting can be guaranteed at any point along a roadway, and only one grouting steel pipe is connected with a mobile grouting pump at each time.
9. The coal mine rock burst treatment method according to claim 3, wherein: the slip casting steel pipe adopts DN219, the length of each perforated pipe is 10 meters, the length of the common seamless steel pipe is 10 meters, the perforated pipes and the common seamless steel pipe are connected through screw threads, and a gap is left between the perforated pipes and the next seamless steel pipe by 0.5 m.
10. The coal mine rock burst treatment method according to claim 3, wherein: if the situation that concrete slurry easily flows back to the working face when the working face goes down the slope is met, a sand bag needs to be stacked between the first hydraulic support and the roadway side in the corner area for blocking, and meanwhile, a flexible baffle is welded at the tail part of the shield beam of the end frame and is drooped to the bottom plate for blocking the backflow of the concrete slurry; the filling and building side is not supported, the top plate and the other side are supported by using a full-length anchoring anchor net cable, and Mary's powder reinforcing materials are used, and the depth is less than 6 meters.
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| CN113217096A (en) * | 2021-06-03 | 2021-08-06 | 北京天地华泰矿业管理股份有限公司 | Goaf accumulated water treatment method suitable for multi-coal-seam mining monoclinic structure mining area |
| CN113187486B (en) * | 2021-06-03 | 2023-12-12 | 华北科技学院(中国煤矿安全技术培训中心) | Deep well non-coal pillar gob-side entry driving method and formed roadway |
| CN113464140A (en) * | 2021-08-18 | 2021-10-01 | 山东新巨龙能源有限责任公司 | Coal mine bed-jig roadway coal-pillar-free mining method |
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