CN110318761B - Construction method for controlling roadway deformation - Google Patents
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- CN110318761B CN110318761B CN201910589034.1A CN201910589034A CN110318761B CN 110318761 B CN110318761 B CN 110318761B CN 201910589034 A CN201910589034 A CN 201910589034A CN 110318761 B CN110318761 B CN 110318761B
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- 239000011435 rock Substances 0.000 claims abstract description 64
- 238000005553 drilling Methods 0.000 claims abstract description 30
- 230000004048 modification Effects 0.000 claims abstract description 18
- 238000012986 modification Methods 0.000 claims abstract description 18
- 238000009412 basement excavation Methods 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- 230000008093 supporting effect Effects 0.000 claims description 17
- 229910000831 Steel Inorganic materials 0.000 claims description 12
- 239000010959 steel Substances 0.000 claims description 12
- 239000004568 cement Substances 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 9
- 239000000126 substance Substances 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
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- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 4
- 235000019353 potassium silicate Nutrition 0.000 claims description 3
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims 1
- 229920000642 polymer Polymers 0.000 claims 1
- 238000004873 anchoring Methods 0.000 abstract description 11
- 238000005065 mining Methods 0.000 description 8
- 230000000903 blocking effect Effects 0.000 description 5
- 230000005641 tunneling Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
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- 230000003313 weakening effect Effects 0.000 description 4
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- 238000006467 substitution reaction Methods 0.000 description 1
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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
- E21D11/04—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 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
- 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
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
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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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Lining And Supports For Tunnels (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
The invention relates to the technical field of roadway surrounding rock control, in particular to a construction method for controlling roadway deformation, which comprises the following steps: a roadway driving and dynamic pressure influence front-stage construction method and a dynamic pressure influence stage construction method such as stoping and the like; the construction method for the roadway excavation and dynamic pressure influence front stage comprises the following steps: drilling a hole in the stress concentration area to form a pressure relief area; performing anchoring support in a surrounding rock area of a shallow layer of the roadway; the construction method for the dynamic pressure influence stage of stoping and the like comprises the following steps: drilling a hole in the area far away from the surface of the roadway to form a pressure relief area; performing grouting modification on surrounding rocks in a region close to the surface of the roadway compared with the pressure relief region; the anchoring support is carried out in the surrounding rock area of the shallow layer of the roadway, multiple measures play a role together, the influence of impact dynamic load on the roadway space is reduced to the maximum extent, the deformation of the roadway is reduced to the maximum extent, the escape space of the roadway after the dynamic disaster is ensured while the risk of the dynamic disasters such as roadway rock burst is reduced, and the casualties of people are reduced.
Description
Technical Field
The invention relates to the technical field of roadway surrounding rock control, in particular to a construction method for controlling roadway deformation.
Background
With the gradual deterioration of coal mining conditions, roadways are increasingly tested under complex conditions such as complex structures, high deep stress, weakness, mining and the like, and supporting is increasingly difficult. Under the influence of coal-rock mechanical properties and mining, dynamic phenomena such as rock burst or strong mine pressure display occur in a plurality of roadways, which are represented as an area near a roadway driving head or a dynamic pressure influence area, coal cannons or roof strata frequently move, even disasters such as rock burst occur, and the generated dynamic load shock waves cause impact damage to roadway spaces, and the spaces are reduced or even closed.
Such roadways go through two main phases: the first stage is as follows: during the tunneling and before the influence of mining dynamic pressure or other dynamic pressures on the working face, the deformation and damage degree of surrounding rocks are small, the stress concentration degree is low, and the distribution of the supporting pressure of the surrounding rocks of the roadway is shown in figure 1 by sigmazRepresents; and a second stage: during working face extraction or after other dynamic pressure influences, disturbance is increased, stress is redistributed, the concentration degree is increased, surrounding rock deformation and damage are increased, the threat of impact dynamic load is also greater, and the supporting pressure distribution of the surrounding rock of the roadway is shown in figure 2 and is expressed by sigma'zAnd (4) showing.
Based on the situation, the comprehensive control method is invented, the probability of occurrence of dynamic disasters is reduced as much as possible, the impact dynamic load intensity is reduced, the deformation degree of the roadway space is reduced, the comprehensive maintenance cost of the roadway is reduced, and space conditions are created as much as possible for people to escape after the disaster accident occurs.
Disclosure of Invention
The embodiment of the invention provides a construction method for controlling roadway deformation, which is used for solving the problems that in the prior art, a roadway space is deformed and accidents such as disasters are easy to happen due to the fact that dynamic load shock waves impact and damage the roadway space.
The embodiment of the invention provides a construction method for controlling roadway deformation, which comprises the following steps: a roadway driving and dynamic pressure influence front-stage construction method and a dynamic pressure influence stage construction method such as stoping and the like; wherein the content of the first and second substances,
the construction method for the roadway excavation and the dynamic pressure influence front stage comprises the following steps:
drilling a hole in the stress concentration area, and performing hydraulic fracturing in the drilled hole to form a hydraulic fracturing crack or performing high-pressure water jet joint cutting to form a pressure relief area;
performing anchoring support in a surrounding rock area of a shallow layer of the roadway;
the construction method for the equal dynamic pressure influence stage of stoping comprises the following steps:
drilling a hole in the area far away from the surface of the roadway, and performing hydraulic fracturing in the drilled hole to form a hydraulic fracturing crack or performing high-pressure water jet joint cutting to form a pressure relief area;
performing grouting modification on surrounding rocks in a region close to the surface of the roadway compared with the pressure relief region;
and carrying out anchoring support in the surrounding rock area of the shallow layer of the roadway.
Wherein drilling the stress riser to form the pressure relief area comprises performing hydraulic fracturing fractures and high pressure water jet lancing in the stress riser.
Wherein drilling the hole away from the roadway surface area and forming the pressure relief area comprises performing hydraulic fracture and high pressure water jet lancing in the area away from the roadway surface.
And carrying out anchoring support in the area of the roadway shallow surrounding rock, wherein the anchoring support comprises supporting by using an anchor rod and an anchor cable in the roadway shallow surrounding rock.
The anchoring support in the roadway shallow surrounding rock area further comprises the step of supporting the roadway shallow surrounding rock by using an arch supporting plate, a W steel guard plate, a W steel belt and a double-layer metal net.
The anchor rods are fixed on shallow surrounding rocks on two sides and at the top of the roadway respectively, and the anchor cables are fixed on the shallow surrounding rocks at the top of the roadway.
The row spacing of the anchor rods is 0.7-1.0m, the row spacing of the anchor cables is 0.7-2.0m, the length of the anchor rods is 2.3-3.0 m, and the length of the anchor cables is 4-8 m.
Wherein drilling a hole in an area away from the roadway surface comprises drilling a hole in an area 15-40 meters from the roadway surface; the grouting modification of the surrounding rock in the area close to the surface of the roadway compared with the pressure relief area comprises the grouting modification of the surrounding rock in the area 4-10 meters away from the surface of the roadway.
And drilling holes in the stress concentration area, performing hydraulic fracturing in the drilled holes to form hydraulic fracturing cracks or performing high-pressure water jet lancing, drilling holes in the area far away from the roadway surface in the step of forming the pressure relief area, performing hydraulic fracturing in the drilled holes to form hydraulic fracturing cracks or performing high-pressure water jet lancing, and setting the value range of the aperture of the drilled holes in the step of forming the pressure relief area to be 50-80 mm.
Wherein, the grouting in the step of performing the grouting modification of the surrounding rock in the area close to the surface of the roadway compared with the pressure relief area adopts cement paste, cement clay paste, cement-water glass paste, superfine cement paste, water glass grouting material or organic polymer grouting material.
According to the construction method for controlling roadway deformation, different construction methods are adopted for different stages of roadway construction, in the stage before roadway excavation and dynamic pressure influence, a pressure relief area is formed by drilling in a stress concentration area, and surrounding rock of a shallow layer of a roadway is anchored and supported; in the dynamic pressure influence stage such as mining, a pressure relief area is formed by drilling holes at a long distance of a roadway, grouting modification is carried out at the middle distance of the roadway, and a support is anchored at the long distance of the roadway. The invention carries out pressure relief transfer and anchor rod strong support in the early stage of tunneling and dynamic pressure influence; after the influence of dynamic pressure, a main bearing ring and a high-strength high-impact-toughness support at a short-distance shallow part are formed by weakening pressure relief at a long distance, blocking shock wave transmission and grouting modification at a middle distance; multiple measures play a role together, the influence of impact dynamic load on the roadway space is reduced to the greatest extent, the deformation of the roadway is reduced to the greatest extent, the dynamic disaster occurrence risks such as roadway rock burst and the like are reduced, meanwhile, the escape space of the roadway after the dynamic disaster occurrence is also ensured, and the casualties of people are reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in 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 diagram of the distribution of pressure of a front support affected by tunneling and dynamic pressure in the prior art;
FIG. 2 is a schematic diagram of pressure distribution after dynamic pressure influence in the prior art;
FIG. 3 is a schematic structural diagram of the construction method of the invention at the pre-stage of roadway excavation and dynamic pressure influence;
FIG. 4 is a schematic view of the structure of a pressure relief transition or barrier region of the present invention;
FIG. 5 is a schematic structural diagram of the construction method at the dynamic pressure influence stage of recovery.
In the figure: 1. a roadway; 2. an anchor rod; 3. an anchor cable; 4. drilling; 5. hydraulic fracturing of fractures; 6. and (6) cutting slits by water jet.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, 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.
As shown in fig. 1 to 5, the present invention discloses a construction method for controlling roadway deformation, comprising: a roadway driving and dynamic pressure influence front-stage construction method and a dynamic pressure influence stage construction method such as stoping and the like; wherein the content of the first and second substances,
the construction method for the roadway excavation and the dynamic pressure influence front stage comprises the following steps:
drilling a hole 4 in the stress concentration area, and performing hydraulic fracturing in the hole 4 to form a hydraulic fracturing crack 5 or performing high-pressure water jet cutting 6 to form a pressure relief area;
performing anchoring support in a shallow surrounding rock area of the roadway 1;
the construction method for the equal dynamic pressure influence stage of stoping comprises the following steps:
drilling a hole 4 in the area far away from the surface of the roadway 1, and performing hydraulic fracturing in the hole 4 to form a hydraulic fracturing crack 5 or performing high-pressure water jet cutting 6 to form a pressure relief area;
performing grouting modification on surrounding rocks in a region close to the surface of the roadway 1 compared with a pressure relief region;
and carrying out anchoring support in the shallow surrounding rock area of the roadway 1.
Note: the "high pressure" in the "high pressure water jet lancing" herein is common knowledge in the art, and the water pressure thereof is 3000 to 4000 bar (bar).
Specifically, the invention discloses a construction method for controlling roadway deformation, which adopts different construction methods according to different stages of roadway construction:
in the early stage of roadway excavation and dynamic pressure influence, firstly, releasing pressure in a stress concentration area: the small-aperture drill hole 4 is adopted for drilling, so that the damage of the drill hole 4 to the shallow surrounding rock and the influence on the supporting effect are greatly reduced while a construction space is created for pressure relief; the stress is relieved in the stress concentration area, the high-stress area is transferred to a deeper position when the stress value of the surrounding rock in the area is reduced, the risk of dynamic disasters is reduced, meanwhile, the pressure relief zone can absorb part of impact energy in the face of impact generated by the deeper dynamic disasters, the effects of blocking and weakening dynamic load transfer are achieved, and a 'pressure relief transfer area' is formed; and then carrying out shallow high-strength support, carrying out high-toughness, high-elongation and high-bearing-capacity anchor rod 2 and anchor cable 3 support on surrounding rock at the shallow part of the roadway 1, and selecting members with large support surface area and high rigidity, such as a high-strength arch supporting plate, a W steel guard plate, a W steel belt, a double-layer metal net and the like. The supporting effect of the shallow surrounding rock is improved, the deformation and the damage of the shallow surrounding rock are reduced, the integrity of the shallow surrounding rock is kept to the maximum extent, and an anchor rod supporting area is formed. Selecting a grouting material according to actual conditions, and adopting cement-water glass double-liquid slurry if the fracture is seriously damaged and the fracture opening is large and large; if general damage is caused, cement-water glass double-liquid slurry can be adopted to be matched with high molecular chemical slurry; if the crack opening is small and the permeability is poor, superfine cement paste, inorganic-organic composite material or high molecular chemical paste can be adopted.
In the dynamic pressure influence stage such as back-mining, maintain respectively to 1 closely, well distance and remote in tunnel, at first carry out the release in 1 remote department in tunnel: the small-aperture drill hole 4 is adopted for drilling, so that the damage of the drill hole 4 to shallow surrounding rock and the influence on the supporting effect are greatly reduced while a construction space is created for remote pressure relief; the pressure relief is carried out in a long distance, the stress of surrounding rocks can be transferred to a deeper position, the risk of dynamic disasters is reduced, meanwhile, the pressure relief zone can absorb part of impact energy when the impact generated by the dynamic disasters happens in the deep position, the effects of blocking and weakening dynamic load transfer are achieved, and a pressure relief blocking area is formed; and then grouting modification is carried out at the distance position in the roadway 1: grouting reinforcement is carried out in a limited range in an original pressure relief transfer area, comprehensive bearing performance of a grouting area is improved, a main bearing ring is formed, dynamic load impact waves in a deep part can be resisted to a certain degree, the main bearing ring can be used as a main bearing main body to bear most static mine pressure, great protection effect is generated on an external roadway space, and a 'reinforced bearing area' is formed; and finally, performing high-strength support on the roadway 1 at a short distance, performing high-toughness, high-elongation and high-bearing-capacity anchor rod 2 and anchor cable 3 support on surrounding rock at the shallow part of the roadway 1, and selecting members with large surface protection area and high rigidity, such as a high-strength arch supporting plate, a W steel guard plate, a W steel belt, a double-layer metal net and the like. The supporting effect of the shallow surrounding rock is improved, the deformation and the damage of the shallow surrounding rock are reduced, the integrity of the shallow surrounding rock is kept to the maximum extent, and an anchor rod supporting area is formed.
The method comprises the steps of drilling holes 4 with small apertures, drilling holes in a stress concentration area, performing hydraulic fracturing in the drilled holes to form hydraulic fracturing cracks or performing high-pressure water jet cutting, drilling holes in the area far away from the surface of a roadway in the step of forming a pressure relief area, performing hydraulic fracturing in the drilled holes to form hydraulic fracturing cracks or performing high-pressure water jet cutting, and enabling the aperture of the drilled holes in the step of forming the pressure relief area to be 50-80mm in value range. The grouting can adopt cement grouting or chemical material grouting, and the cement grouting comprises the following steps: cement paste, cement clay paste, cement-water glass (sodium silicate) paste, or ultrafine cement paste; grouting chemical materials: water glass grouting material or organic polymer grouting material.
According to the construction method for controlling roadway deformation, different construction methods are adopted for different stages of roadway construction, in the stage before roadway excavation and dynamic pressure influence, a pressure relief area is formed by drilling a hole 4 in a stress concentration area, and a surrounding rock of a shallow layer of a roadway is anchored and supported; in the dynamic pressure influence stage such as mining, a pressure relief area is formed by drilling a hole 4 at a long distance of a roadway, grouting modification is carried out at the middle distance of the roadway, and a support is anchored at the long distance of the roadway. The invention carries out pressure relief transfer and anchor rod strong support in the early stage of tunneling and dynamic pressure influence; after the influence of dynamic pressure, a main bearing ring and a high-strength high-impact-toughness support at a short-distance shallow part are formed by weakening pressure relief at a long distance, blocking shock wave transmission and grouting modification at a middle distance; multiple measures play a role together, the influence of impact dynamic load on the roadway space is reduced to the greatest extent, the deformation of the roadway is reduced to the greatest extent, the dynamic disaster occurrence risks such as roadway rock burst and the like are reduced, meanwhile, the escape space of the roadway after the dynamic disaster occurrence is also ensured, and the casualties of people are reduced.
The method is characterized in that holes 4 are drilled in the stress concentration area to form a pressure relief area, hydraulic fracturing cracks 5 and high-pressure water jet cutting seams 6 are conducted in the stress concentration area, a certain deformation allowable space and a certain weak surface are artificially manufactured, and the pressure relief area is formed. Similarly, the drilling 4 of the surface area far away from the roadway 1 to form the pressure relief area comprises the hydraulic fracturing of the fracture 5 and the high-pressure water jet cutting of the fracture 6 in the surface area far away from the roadway 1, so that a large range of deformation-allowable spaces and weak planes are formed, and the pressure relief area is formed.
Wherein, anchor support is carried out in 1 shallow layer country rock region in tunnel includes and utilizes stock 2 and anchor rope 3 to support at 1 shallow layer country rock in tunnel. In the embodiment, the support of the surrounding rock on the shallow layer of the roadway 1 by using the anchor rods 2 and the anchor cables 3 can be applied to the construction method of the roadway 1 in the early stage of the tunneling and dynamic pressure influence or the construction method of the dynamic pressure influence stage such as the back-mining and the like. Specifically, the anchor rod 2 is fixed on shallow layer surrounding rocks on two sides of the roadway 1 and at the top of the roadway 1 respectively, and the anchor cable 3 is fixed on the shallow layer surrounding rocks at the top of the roadway 1. The row spacing of the anchor rods 2 is 0.7-1.0m, the row spacing of the anchor cables 3 is 0.7-2.0m, the length of the anchor rods 2 is 2.3-3.0 m, and the length of the anchor cables is 4-8 m. According to actual needs, other anchoring parts can be adopted by those skilled in the art, such as the roadway 1 shallow surrounding rock area or shallow surrounding rock for anchoring support or further comprising the roadway 1 shallow surrounding rock support by using arched supporting plates, W steel guard plates, W steel belts and double-layer metal nets.
Wherein drilling 4 in the area far away from the surface of the roadway 1 comprises drilling 4 in the area 15-40 meters away from the surface of the roadway 1; the grouting modification of the surrounding rock in the area close to the surface of the roadway 1 compared with the pressure relief area comprises the grouting modification of the surrounding rock in the area 4-10 meters away from the surface of the roadway 1. And the pressure relief range of the roadway excavation and dynamic pressure influence front stage is about 5-15 m. The selection of the drilling 4 and grouting area may be suitably changed by those skilled in the art depending on the size of the actual roadway 1 or other practical conditions.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
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 (5)
1. A construction method for controlling roadway deformation is characterized by comprising the following steps: a roadway driving and dynamic pressure influence front-stage construction method and a dynamic pressure influence stage construction method such as stoping and the like; wherein the content of the first and second substances,
the construction method for the roadway excavation and the dynamic pressure influence front stage comprises the following steps:
drilling a hole in the stress concentration area, and performing hydraulic fracturing in the drilled hole to form a hydraulic fracturing crack or performing high-pressure water jet joint cutting to form a pressure relief area;
supporting shallow surrounding rocks of the roadway by using anchor rods, anchor cables, arch-shaped supporting plates, W steel guard plates, W steel belts and double-layer metal nets, wherein the anchor rods are respectively fixed on the shallow surrounding rocks at the two sides and the top of the roadway, and the anchor cables are fixed on the shallow surrounding rocks at the top of the roadway;
the construction method for the equal dynamic pressure influence stage of stoping comprises the following steps:
drilling a hole in the area far away from the surface of the roadway, and performing hydraulic fracturing in the drilled hole to form a hydraulic fracturing crack or performing high-pressure water jet joint cutting to form a pressure relief area;
performing grouting modification on surrounding rocks in a region close to the surface of the roadway compared with the pressure relief region;
utilize stock, anchor rope, arch layer board, W steel backplate, W steel band and double-deck metal mesh to strut at tunnel shallow layer country rock, wherein, the stock is fixed in the shallow layer country rock at tunnel both sides and top respectively, the anchor rope is fixed in the top shallow layer country rock in tunnel.
2. The construction method for controlling roadway deformation according to claim 1, wherein the row spacing of the anchor rods is 0.7-1.0m, the row spacing of the anchor cables is 0.7-2.0m, the length of the anchor rods is 2.3-3.0 m, and the length of the anchor cables is 4-8 m.
3. The construction method for controlling deformation of the roadway according to claim 1, wherein the drilling in the area away from the roadway surface comprises drilling in an area 15-40 meters away from the roadway surface; the grouting modification of the surrounding rock in the area close to the surface of the roadway compared with the pressure relief area comprises the grouting modification of the surrounding rock in the area 4-10 meters away from the surface of the roadway.
4. A construction method for controlling roadway deformation according to any one of claims 1-3, wherein the stress concentration zone is drilled, hydraulic fracturing is performed in the drilled hole to form hydraulic fracturing cracks or high-pressure water jet slitting is performed, the hole is drilled in the zone far away from the roadway surface in the step of forming the pressure relief zone, hydraulic fracturing is performed in the drilled hole to form hydraulic fracturing cracks or high-pressure water jet slitting is performed, and the hole diameter in the step of forming the pressure relief zone is 50-80 mm.
5. The construction method for controlling roadway deformation according to any one of claims 1 to 3, wherein the grouting in the step of performing grouting modification on the surrounding rock in the roadway surface area compared with the pressure relief area is made of cement clay slurry, cement-water glass slurry, ultra-fine cement slurry, water glass grouting material or polymer grouting material.
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| CN201910589034.1A CN110318761B (en) | 2019-07-02 | 2019-07-02 | Construction method for controlling roadway deformation |
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| CN111305876A (en) * | 2020-03-27 | 2020-06-19 | 天地科技股份有限公司 | Deep roadway anchoring-splitting grouting-hydraulic fracturing pressure relief cooperative control method |
| CN111720139B (en) * | 2020-06-19 | 2021-11-23 | 煤炭科学技术研究院有限公司 | Roadway impact ground pressure structure cooperative prevention and control method influenced by repeated mining |
| CN112360470A (en) * | 2020-10-28 | 2021-02-12 | 中煤科工开采研究院有限公司 | Construction method for improving stress environment of advanced support pressure section of mining roadway |
| CN112554888B (en) * | 2020-11-19 | 2022-08-02 | 山东科技大学 | Pressure relief-reinforcement cooperative maintenance method for roadway under boundary coal pillar |
| CN112253163A (en) * | 2020-11-20 | 2021-01-22 | 临沂矿业集团菏泽煤电有限公司 | System for protecting mine roadway |
| CN112431596B (en) * | 2020-11-26 | 2022-02-15 | 中煤科工开采研究院有限公司 | Three-stage prevention and control method for rock burst roadway |
| CN112922636B (en) * | 2021-03-01 | 2023-11-17 | 天地科技股份有限公司 | Surrounding rock supporting construction method for roadway |
| CN113622913B (en) * | 2021-08-20 | 2022-05-06 | 中国矿业大学 | Deformation control method for mining tunnel surrounding rock integrated with underground and up-down tunnel by full-caving method |
| CN114109483B (en) * | 2021-11-24 | 2024-04-19 | 天地科技股份有限公司 | Dynamic load rock burst roadway surrounding rock stability control method |
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| SU1221373A1 (en) * | 1984-10-08 | 1986-03-30 | Забайкальский Комплексный Научно-Исследовательский Институт Министерства Геологии Ссср | Method of constructing rock-concrete roof support |
| CN102220866B (en) * | 2011-04-17 | 2013-09-18 | 山东科技大学 | Pressure relief and consolidation synergizing prevention and control method for rock burst in deep coal drift |
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