CN116641724A - Cooperative control method for high-prestress constant-resistance anchor rod and anchor cable of deep-buried soft rock roadway - Google Patents
Cooperative control method for high-prestress constant-resistance anchor rod and anchor cable of deep-buried soft rock roadway Download PDFInfo
- Publication number
- CN116641724A CN116641724A CN202310926700.2A CN202310926700A CN116641724A CN 116641724 A CN116641724 A CN 116641724A CN 202310926700 A CN202310926700 A CN 202310926700A CN 116641724 A CN116641724 A CN 116641724A
- Authority
- CN
- China
- Prior art keywords
- prestress
- anchor
- roadway
- anchor rod
- npr
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000011435 rock Substances 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 26
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 53
- 239000010959 steel Substances 0.000 claims abstract description 53
- 238000005422 blasting Methods 0.000 claims abstract description 29
- 230000008093 supporting effect Effects 0.000 claims abstract description 23
- 238000005516 engineering process Methods 0.000 claims abstract description 14
- 239000004567 concrete Substances 0.000 claims abstract description 13
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 13
- 238000010276 construction Methods 0.000 claims abstract description 11
- 239000011241 protective layer Substances 0.000 claims abstract description 4
- 238000005507 spraying Methods 0.000 claims abstract description 4
- 239000010410 layer Substances 0.000 claims description 16
- 239000000945 filler Substances 0.000 claims description 10
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 6
- 230000006855 networking Effects 0.000 claims description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 3
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 3
- 239000010883 coal ash Substances 0.000 claims description 3
- 239000004571 lime Substances 0.000 claims description 3
- 238000009412 basement excavation Methods 0.000 description 7
- 230000001976 improved effect Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 239000002360 explosive Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000002349 favourable effect Effects 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
Classifications
-
- 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
- E21D11/006—Lining anchored in the rock
-
- 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
-
- 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
- E21D11/107—Reinforcing elements therefor; Holders for the reinforcing elements
-
- 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
- E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
-
- 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
- E21D9/006—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries by making use of blasting methods
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a cooperative control method for a high-prestress constant-resistance anchor rod and an anchor cable of a deep-buried soft rock roadway, which belongs to the technical field of roadway surrounding rock support and comprises the following steps: the section forming is controlled by adopting a two-dimensional smooth blasting technology according to the design shape of a roadway, main rock of a working face is blasted, a protective layer is left, and then blasting is performed through blastholes in a contour line; after the section is formed, firstly spraying concrete to seal surrounding rock, paving a reinforcing mesh, and then carrying out supporting construction on the high-prestress NPR anchor rod; after the high-prestress NPR anchor rod is driven in, a U-shaped steel shed is used for supporting the whole section; then carrying out supporting construction on the high-prestress NPR anchor cable, and connecting the anchor cable at the top of the roadway and the side part of the roadway with the anchor rod by using a W-shaped steel belt; then laying a bottom plate; the high-prestress anchor cable and anchor rod cooperative support control technology of the system is formed by utilizing the characteristic of high prestress constant resistance, and the problem that the existing deep-buried soft rock roadway support cannot be effectively controlled is solved.
Description
Technical Field
The invention belongs to the technical field of roadway surrounding rock support, and particularly relates to a cooperative control method of a high-prestress constant-resistance anchor rod and an anchor cable of a deep-buried soft rock roadway.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
Along with the rapid development of economy, the demand of human production and life for energy is continuously increasing, and the exploitation intensity of energy is also continuously increasing. The resources of the shallow part are increasingly in shortage in the global scope, and the position of resource exploitation is gradually changed from the shallow part to the deep part. Along with the increase of exploitation depth, the influence of broken surrounding rock, high ground stress and the like can generate large deformation damage in a short time by the conventional supporting forms such as anchor net cable spraying and the like, the roadway can not meet the normal use requirement, the roadway can be used after being repaired, the phenomenon of 'digging while repairing' is frequently generated, and the construction progress is slow and the supporting cost is increased. Meanwhile, the mining process occurs when the mud soft rock excavates the roadway, and the phenomenon of overexcavation and underexcavation during blasting excavation is very common in the roadway with mud rock as the main component, so that the problem of poor section forming exists.
Disclosure of Invention
Aiming at the problems, the invention provides a cooperative control method for a high-prestress constant-resistance anchor rod and an anchor cable of a deep-buried soft rock roadway, which is based on a high-performance NPR (Negative Poisson's Ratio) anchor cable material with high constant resistance, large deformation and energy absorption, and utilizes the characteristic of high-prestress constant resistance to form a cooperative support control technology of the high-prestress long and short anchor cable of a system, so that the problem that the existing support of the deep-buried soft rock roadway cannot be effectively controlled is solved.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a cooperative control method for a high-prestress constant-resistance anchor rod and an anchor cable of a deep-buried soft rock roadway comprises the following steps:
the section forming is controlled by adopting a two-dimensional smooth blasting technology according to the design shape of a roadway, main rock of a working face is blasted, a protective layer is left, and then blasting is performed through blastholes in a contour line;
after the section is formed, firstly spraying concrete to seal surrounding rock, paving a reinforcing mesh, and then carrying out supporting construction on the high-prestress NPR anchor rod;
after the high-prestress NPR anchor rod is driven in, a U-shaped steel shed is used for supporting the whole section;
then carrying out supporting construction on the high-prestress NPR anchor cable, and connecting the anchor cable at the top of the roadway and the side part of the roadway with the anchor rod by using a W-shaped steel belt;
then a bottom plate is paved, concrete is sprayed to seal the bottom plate after the bottom plate is paved, then a seamless steel pipe is used for inserting reinforcing steel bars into the bottom angle of the section, and concrete is used for grouting; pouring a layer of concrete with waterproof materials around the cross section, and filling up with crushed gangue;
after the primary support is stable, the waterproof layer is paved and the secondary lining is performed.
Further, the high-prestress NPR anchor rods and the high-prestress NPR anchor cables are arranged in a staggered mode, and a plurality of high-prestress NPR anchor rods and the high-prestress NPR anchor cables are arranged along the length direction.
Further, the length of the high-prestress NPR anchor cable is longer than that of the high-prestress NPR anchor rod, and the high-prestress NPR anchor rod is anchored in a surrounding rock plastic area to form an inner bearing ring; the high-prestress NPR anchor cable is supported in the surrounding rock elastic area to form an outer bearing ring.
Further, the rod bodies of the seamless steel pipes are uniformly perforated and arranged in a three-flower mode.
Furthermore, the anchor cable and the anchor rod at the top of the roadway are connected in a trend manner by using W-shaped steel belts, and the anchor cable and the anchor rod at the upper part of the roadway are connected in a trend manner by using W-shaped steel belts which are arranged in parallel.
Further, a filler is paved at the lower part of the bottom plate, and the filler is lime powder or coal ash powder; the filler is filled at the bottom of the roadway to form a plane at the bottom of the roadway, and a bottom plate is paved after the plane is formed.
Further, the W-shaped steel belt and the central line of the roadway are arranged in the same direction, and a reinforced ladder beam is arranged on the upper portion of the W-shaped steel belt.
Further, the reinforced ladder beam is arranged at the front end and the rear end of the roadway, a plurality of bottom corner grouting anchor pipes are arranged between the reinforced ladder beams at the front end and the rear end, and right-handed longitudinal rib-free threaded steel anchor rods are arranged between the plurality of bottom corner grouting anchor pipes and between the bottom corner grouting anchor pipes and the reinforced ladder beam.
Furthermore, the high-prestress NPR anchor cable, the high-prestress NPR anchor rod, the reinforced ladder beam, the W-shaped steel belt and the bottom angle grouting anchor pipe are cooperatively supported to form a double-layer supporting surrounding rock bearing structure.
Further, the mesh sheets of the reinforcing mesh are welded point by point, and the reinforcing mesh are connected through a special networking device.
Compared with the prior art, the invention has the advantages and positive effects that:
1. the high-prestress NPR anchor rod is anchored in a surrounding rock plastic area to form an inner layer bearing ring, and the high-prestress NPR anchor rod mainly controls deformation of shallow surrounding rock. The high-prestress NPR anchor cable is supported in the surrounding rock elastic area, partial stress is transmitted to the deep part of the surrounding rock through the high-prestress NPR anchor cable, the overall stability of the surrounding rock is enhanced, an outer bearing ring is formed, the characteristics of constant resistance and large deformation of the NPR anchor cable and the anchor rod are utilized, energy is absorbed through the deformation of the anchor cable and the anchor rod in a high-prestress environment, the stress distribution of the surrounding rock is uniform, and the surrounding rock is in a stable state. The NPR anchor cable and the anchor rod have the super-strong characteristics of high constant resistance, large deformation, energy absorption and the like, and compared with the common anchor cable and the anchor rod, the NPR anchor cable and the anchor rod have the advantages of high safety, good economic benefit, wide application range and the like.
2. The invention adopts the two-dimensional smooth blasting technology, and in the process of excavation, the two-dimensional smooth blasting technology is used for controlling the formation of the section of the roadway, providing favorable conditions for the support of the long and short anchor cables with high prestress, and ensuring that the support material is tightly attached to the rock face. The two-dimensional smooth blasting technology provides favorable conditions for high-prestress anchor cables and anchor rod supports; meanwhile, the advantages of the NPR anchor cable are fully exerted, the deformation of surrounding rock is effectively limited, and the bearing effect is exerted earlier and higher.
3. According to the invention, the high-prestress NPR anchor cable, the high-prestress NPR anchor rod, the reinforced ladder beam, the W-shaped steel belt and the bottom angle grouting anchor pipe are cooperatively supported to form a double-layer supporting surrounding rock bearing structure, so that the integrity of surrounding rock is improved, and the purpose of deeper stable reinforcement of the surrounding rock of the deep-buried roadway is achieved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a cross-sectional layout of a support of the present invention;
FIG. 3 is a deployment plan of the support of the present invention;
FIG. 4 is a schematic representation of a partition of the present invention;
in the figure: the steel bar reinforced concrete composite anchor comprises the following components of a 1-roadway section, a 2-high prestress NPR anchor rope, a 3-high prestress NPR anchor rod, a 4-base angle grouting anchor pipe, a 5-section base angle, a 6-filler, a 7-roadway top, an 8-roadway side part, a 9-roadway center line, a 10-arch base line, a 11-W-shaped steel band, a 12-steel bar ladder beam, a 13-steel bar net, a 14-right-hand non-longitudinal rib screw steel anchor rod, a 15-bottom plate, a 16-contour line, a 17-protection layer and a 18-blast hole.
Detailed Description
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;
for convenience of description, the words "upper", "lower", "left" and "right" in the present invention, if they mean only the directions of upper, lower, left and right in correspondence with the drawings themselves, are not limiting in structure, but merely serve to facilitate description of the present invention and simplify description, rather than to indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
The invention is described in detail below by combining the drawings, and the method for cooperatively controlling the high-prestress constant-resistance anchor rod and the anchor cable of the deep soft rock roadway disclosed by the embodiment, as shown in fig. 1, comprises the following steps:
(1) The section forming is controlled by adopting a two-dimensional smooth blasting technology according to the design shape of the roadway, main rock of the working face is blasted, a protective layer 17 with the thickness of 100mm is left, and then blasted through blast holes 18 on the contour line 16. The design shape of the track main roadway is a straight wall semicircular arch. Mao Duanmian has a width 5200mm and a height 4420mm, and the arch height 2600mm; the net section width is 4600mm, the height is 3900mm, and the arch height is 2300mm.
(2) C20 concrete is sprayed to seal surrounding rock after the section is formed, a reinforcing mesh 13 is paved, and then the high-prestress NPR anchor rod 3 is used for supporting construction;
(3) After the high-prestress NPR anchor rods 3 are driven in, supporting the whole section by using a U-shaped steel shed;
(4) Then carrying out supporting construction on the high-prestress NPR anchor cable 2, and connecting the anchor cables of the tunnel top 7 and the tunnel side part 8 with the anchor rods by using W-shaped steel belts 11;
(5) And then the bottom plate 15 is paved, and 75mm of concrete is sprayed to seal the bottom plate 15 after the bottom plate 15 is paved. Then, inserting reinforcing steel bars into the bottom corners 5 of the sections by adopting seamless steel pipes 4 and grouting by adopting C25 concrete; and then casting a layer of concrete with the thickness of 400mm and added with waterproof materials around the section, and filling up with crushed gangue.
(6) After the primary support is stable, the waterproof layer is paved and the secondary lining is performed.
Tunnel smooth blasting is one of the important technologies supporting the new law principle. The blasting control technology is characterized in that the blasting parameters and the reasonable construction method are correctly selected, and the sectional and sectional differential blasting is performed, so that the contour line after blasting meets the design requirement, and the free surface is leveled.
Smooth blasting is a controlled blasting technique in which the new wall surface that is blasted remains flat and is not significantly damaged. The method is characterized in that a row of smooth blastholes with hole pitch matched with the minimum resistance line are drilled on a designed excavation contour line, uncoupled charge or other special charge structures are adopted, and after the main body of the excavation is blasted, the charges in the smooth blastholes are blasted simultaneously, so that a smooth and flat excavation surface penetrating through the smooth blastholes is formed.
Besides being applied to open-air excavation, the smooth blasting technology also has good effects in construction of many underground projects (such as mine development roadways, underground factories, hydroelectric power stations, oil reservoirs, tunnels, national defense structures and other permanent buildings) in China, and particularly when constructing some hydraulic tunnels, the smooth blasting technology not only can reduce the condition of overexcavation and underexplosion, but also can reduce the hydraulic friction coefficient to the extent of smooth surface achieved by special lining. Thus, smooth blasting is a new blasting technique for reasonably utilizing the energy of explosive.
The basic principle of smooth blasting is to control the blasting action of the explosive, so that the high-power acting form is converted into the explosive-force acting form more, the initial impulse of the explosive blasting is reduced, the damage to the rock mass of the blasthole wall is reduced, and the development of the blasting crack along the expected direction is controlled. The method is realized by reasonably selecting explosive and charging structure according to different rock stratum conditions, and correctly selecting peripheral hole blasting parameters (namely hole spacing, resistance line and charging amount) and ensuring that peripheral holes detonate simultaneously.
The two-dimensional smooth blasting technique is to blast main rock firstly and then blast the protection layer through blast holes on the contour line; in the process of excavation, a two-dimensional smooth blasting technology is used for controlling the formation of the section of a roadway, providing favorable conditions for supporting the long and short anchor cables with high prestress, and ensuring that the supporting material is tightly attached to the rock face.
The high-prestress NPR anchor rods 3 and the high-prestress NPR anchor cables 2 are arranged in a staggered mode, and a plurality of high-prestress NPR anchor rods are arranged along the length direction. The length of the high-prestress NPR anchor cable 2 is longer than that of the high-prestress NPR anchor rod 3, and the high-prestress NPR anchor rod 3 is anchored in a surrounding rock plastic area to form an inner bearing ring; the high-prestress NPR anchor cable 2 is supported in an elastic area of surrounding rock to form an outer bearing ring. The secondary bearing structure formed by the anchor bolt support is connected with the deep surrounding rock, so that the stability of the secondary bearing structure is improved, meanwhile, the bearing capacity of the deep surrounding rock is fully adjusted, rock bodies in a larger range are jointly borne, and the anchor cable exerts larger pretightening force and can squeeze and compact discontinuous surfaces such as layers, joint cracks and the like in the rock stratum, and the shearing resistance between the discontinuous surfaces is increased, so that the overall strength of the surrounding rock is improved.
The high-prestress NPR anchor cable 2 is used for reinforcing a roadway by adopting the high-stress NPR anchor cable 2; the full-section U-shaped steel canopy combined support refers to supporting the section of a roadway by using a U-shaped steel canopy. The double-layer supporting surrounding rock bearing structure is formed by using the high-prestress NPR anchor cable 2, so that dislocation and separation layer development of deep surrounding rock are limited, the integrity of the surrounding rock is improved, and deformation energy in the surrounding rock can be released in a limited control mode by the cooperation of the NPR anchor cable and the anchor rod. The whole section U-shaped steel shed combined support is adopted, so that the integrity and reliability of the support system are improved. The U-shaped shed is basically arranged in a special section, soft rock, coal penetrating tunnel and the like, so that the U-shaped shed does not need to be arranged in all places.
And the rod body of the seamless steel tube 4 is uniformly perforated and is arranged in a three-flower way. Compared with the common steel pipe, the seamless steel pipe 4 has better bending and torsional strength, tensile strength and elastic modulus, better impact resistance and fatigue resistance, long effective service life, lighter weight and excellent creep resistance, and does not need to be maintained regularly.
The anchor cable and the anchor rod of the tunnel top 7 are connected in a trend by using a W-shaped steel belt 11, the anchor cable and the anchor rod of the tunnel upper 8 are connected in a trend by using the W-shaped steel belt 11, and the W-shaped steel belts 11 are arranged in parallel.
The filler is paved at the lower part of the bottom plate 15, and the filler is lime powder or coal ash powder; the filler is filled at the bottom of the roadway to form a plane at the bottom of the roadway, and the bottom plate 15 is paved after the plane is formed.
The W-shaped steel belt 11 and the tunnel center line 9 are arranged in the same direction, and a steel bar ladder beam 12 is arranged at the upper part of the W-shaped steel belt 11. The reinforced ladder beams 12 are arranged at the front and rear ends of a roadway, a plurality of bottom corner grouting anchor pipes 4 are arranged between the reinforced ladder beams at the front and rear ends, and right-handed longitudinal rib-free deformed steel bar anchor rods 14 are arranged between the plurality of bottom corner grouting anchor pipes and between the bottom corner grouting anchor pipes 4 and the reinforced ladder beams 12. The high-prestress NPR anchor cable 2, the high-prestress NPR anchor rod 3, the reinforced ladder beam 12, the W-shaped steel belt 11 and the bottom angle grouting anchor pipe 4 are cooperatively supported to form a double-layer supporting surrounding rock bearing structure.
The reinforced ladder beams 12 are arranged in a direction perpendicular to the central line of the roadway, and the right-handed longitudinal rib-free threaded steel anchor rods 14 and the bottom corner grouting anchor pipes 4 are in the same direction.
The arrangement of the reinforcing mesh 13 is carried out in the process of tunneling, namely, after the shape of a roadway is excavated, the reinforcing mesh is paved, then anchor rods are arranged to form a whole, the meshes of the reinforcing mesh 13 are welded point by point, and the reinforcing mesh are connected through a special networking device. The upper net and the bottom net are connected with each other by a hook; the hook buckle connection has stable performance, good integrity and high connection strength, and improves the quality of the support system.
The high prestress NPR anchor rod 3 adopts an HMG-300-2.5 constant-resistance large-deformation anchor rod, the diameter is 22mm, the length is 2500mm, and the row spacing between the roof side anchor rods is 800mm multiplied by 800mm and is arranged in parallel.
The high pre-stress NPR anchor cable 2 adopts an HMS-300-6.3 constant-resistance large-deformation anchor cable, the diameter of a steel strand is 21.8mm, the length of a top anchor cable is 6300mm, the length of an upper anchor cable is 5200mm, the strength grade is 1770MPa, the row spacing between roof anchor cables is 800mm multiplied by 1200mm, the row spacing of the upper constant-resistance large-deformation anchor cable is 1600mm, the roof is connected in a trend manner by adopting a W-shaped steel belt 11, and the upper is connected in a trend manner by adopting a W-shaped steel belt 11 and is arranged in parallel.
The reinforced ladder beam 12 is formed by welding reinforcing steel bars with the diameter phi of 14mm, the distance between two reinforcing steel bars is not more than 60mm, the distance between connecting points is 600mm, the reinforcing steel bars with the diameter phi of 12mm are used for binding and welding, the using length of a top plate is 5m, and the using length of two sides is 2.6m.
The W-shaped steel belt 11 is made of Q235, and the width is 280mm and the thickness is 4 mm.
The reinforcing steel bar net 13 is formed by welding reinforcing steel bars with the diameter of phi 8.0mm, the mesh size is 1000 multiplied by 2000mm, the mesh size is 100 multiplied by 100mm, the mesh overlap joint is 100-200 mm, the meshes are connected through a special networking tool by a clasp, and the distance between connecting points is not more than 200mm.
The bottom angle grouting anchor pipe 4 adopts a seamless steel pipe, the size is that the outer diameter is 32mm, the inner diameter is 24mm, the length is 4000mm, reinforcing steel bars with the diameter of 14mm and the length of 3500mm are inserted, 12 phi 12mm round holes are evenly drilled on a steel pipe body, the longitudinal spacing of the holes is 500mm, and three flowers are arranged. The three flowers are arranged in a row of two flowers and are arranged in a row of one flower in a crossing way.
While the foregoing description of the embodiments of the present invention has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the invention, but rather, it is intended to cover all modifications or variations within the scope of the invention as defined by the claims of the present invention.
Claims (10)
1. A cooperative control method for a high-prestress constant-resistance anchor rod and an anchor cable of a deep-buried soft rock roadway is characterized by comprising the following steps:
the section forming is controlled by adopting a two-dimensional smooth blasting technology according to the design shape of a roadway, main rock of a working face is blasted, a protective layer is left, and then blasting is performed through blastholes in a contour line;
after the section is formed, firstly spraying concrete to seal surrounding rock, paving a reinforcing mesh, and then carrying out supporting construction on the high-prestress NPR anchor rod;
after the high-prestress NPR anchor rod is driven in, a U-shaped steel shed is used for supporting the whole section;
then carrying out supporting construction on the high-prestress NPR anchor cable, and connecting the anchor cable at the top of the roadway and the side part of the roadway with the anchor rod by using a W-shaped steel belt;
then a bottom plate is paved, concrete is sprayed to seal the bottom plate after the bottom plate is paved, then a seamless steel pipe is used for inserting reinforcing steel bars into the bottom angle of the section, and concrete is used for grouting; pouring a layer of concrete with waterproof materials around the cross section, and filling up with crushed gangue;
after the primary support is stable, the waterproof layer is paved and the secondary lining is performed.
2. The cooperative control method for the high-prestress constant-resistance anchor rods and the anchor cables of the deep-buried soft rock roadway according to claim 1, wherein the high-prestress NPR anchor rods and the high-prestress NPR anchor cables are arranged in a staggered mode, and a plurality of the high-prestress NPR anchor rods and the high-prestress NPR anchor cables are arranged along the length direction.
3. The cooperative control method for the high-prestress constant-resistance anchor rod and the anchor cable of the deep soft rock roadway according to claim 1, wherein the length of the high-prestress NPR anchor cable is larger than that of the high-prestress NPR anchor rod, and the high-prestress NPR anchor rod is anchored in a surrounding rock plastic area to form an inner bearing ring; the high-prestress NPR anchor cable is supported in the surrounding rock elastic area to form an outer bearing ring.
4. The cooperative control method for the high-prestress constant-resistance anchor rod and the anchor cable of the deep-buried soft rock roadway according to claim 1, wherein the rod bodies of the seamless steel pipes are uniformly drilled and arranged in three flowers.
5. The cooperative control method for the high-prestress constant-resistance anchor rod and anchor rod of the deep-buried soft rock roadway according to claim 1, wherein the anchor rod and the anchor rod at the top of the roadway are connected in a trend by using a W-shaped steel belt, and the anchor rod at the upper part of the roadway are connected in a trend by using the W-shaped steel belt, and the W-shaped steel belts are arranged in parallel.
6. The cooperative control method of the high-prestress constant-resistance anchor rod and the anchor cable of the deep soft rock roadway as claimed in claim 1, wherein a filler is paved at the lower part of the bottom plate, and the filler is lime powder or coal ash powder; the filler is filled at the bottom of the roadway to form a plane at the bottom of the roadway, and a bottom plate is paved after the plane is formed.
7. The cooperative control method for the high-prestress constant-resistance anchor rod and the anchor cable of the deep soft rock roadway according to claim 1, wherein the W-shaped steel belt is arranged in the same direction as the center line of the roadway, and the upper part of the W-shaped steel belt is provided with a reinforced ladder beam.
8. The cooperative control method for the high-prestress constant-resistance anchor rod and the anchor cable of the deep soft rock roadway according to claim 7, wherein the reinforced ladder beams are arranged at the front end and the rear end of the roadway, a plurality of bottom angle grouting anchor pipes are arranged between the reinforced ladder beams at the front end and the rear end, and right-handed longitudinal rib-free threaded steel anchor rods are arranged between the bottom angle grouting anchor pipes and the reinforced ladder beams.
9. The cooperative control method for the high-prestress constant-resistance anchor rod and the anchor cable of the deep-buried soft rock roadway is characterized in that the high-prestress NPR anchor cable, the high-prestress NPR anchor rod, the reinforced ladder beam, the W-shaped steel belt and the bottom angle grouting anchor pipe are cooperatively supported to form a double-layer supporting surrounding rock bearing structure.
10. The cooperative control method for the high-prestress constant-resistance anchor rod and the anchor cable of the deep soft rock roadway according to claim 1, wherein the mesh sheets of the reinforcing mesh are welded point by point, and the reinforcing mesh are connected through a special networking tool.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310926700.2A CN116641724B (en) | 2023-07-27 | 2023-07-27 | Cooperative control method for high-prestress constant-resistance anchor rod and anchor cable of deep-buried soft rock roadway |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310926700.2A CN116641724B (en) | 2023-07-27 | 2023-07-27 | Cooperative control method for high-prestress constant-resistance anchor rod and anchor cable of deep-buried soft rock roadway |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116641724A true CN116641724A (en) | 2023-08-25 |
| CN116641724B CN116641724B (en) | 2023-10-13 |
Family
ID=87623309
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310926700.2A Active CN116641724B (en) | 2023-07-27 | 2023-07-27 | Cooperative control method for high-prestress constant-resistance anchor rod and anchor cable of deep-buried soft rock roadway |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116641724B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117552813A (en) * | 2024-01-12 | 2024-02-13 | 中国矿业大学(北京) | Surrounding rock reinforcement construction method for deep roadway |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1571259A1 (en) * | 1988-07-05 | 1990-06-15 | Днепропетровский Государственный Проектный Институт "Днепрогипрошахт" | 1-beam frame support of mine working |
| JPH07127373A (en) * | 1993-10-29 | 1995-05-16 | Maeda Corp | Method and apparatus for constructing tunnel |
| CN105041353A (en) * | 2015-08-17 | 2015-11-11 | 河南理工大学 | Roadway anchor net re-jetting double-folded-shed surrounding rock control technology |
| CN106121689A (en) * | 2016-08-22 | 2016-11-16 | 福州大学 | A kind of excavation method of non-coal mine underground large stable chamber |
| US20190218910A1 (en) * | 2017-01-23 | 2019-07-18 | Shandong University Of Science And Technology | Asymmetric support structure of entry driven along gob-side under unstable roof in deep mines and construction method thereof |
| CN111058865A (en) * | 2019-12-18 | 2020-04-24 | 永城煤电控股集团有限公司 | Drilling and blasting rock roadway anchor net cable spraying construction process |
| CN113107556A (en) * | 2021-04-13 | 2021-07-13 | 中铁隧道集团二处有限公司 | Construction method of tunnel support based on NPR anchor cable |
| CN113494299A (en) * | 2021-07-22 | 2021-10-12 | 河海大学 | Tunnel rockburst grading prevention and control method using NPR material |
| CN114109436A (en) * | 2021-12-01 | 2022-03-01 | 中铁二局集团有限公司 | Large-span underground excavation construction method for subway station |
| CN114483085A (en) * | 2022-04-01 | 2022-05-13 | 中国矿业大学(北京) | Construction method of double-partition double-control system of soft rock tunnel |
| CN115163110A (en) * | 2022-04-01 | 2022-10-11 | 中国矿业大学(北京) | Double-partition double-control supporting system for soft rock tunnel |
| CN115726809A (en) * | 2022-11-14 | 2023-03-03 | 重庆大学 | Comprehensive control method for three-dimensional stope surrounding rock deformation under high-stress complex condition |
| CN116220769A (en) * | 2023-05-06 | 2023-06-06 | 中国矿业大学(北京) | Supporting method and supporting structure adopting microscopic NPR anchor rods or anchor cables |
| CN116220749A (en) * | 2023-05-06 | 2023-06-06 | 中国矿业大学(北京) | A prevent accuse structure for rock burst tunnel |
-
2023
- 2023-07-27 CN CN202310926700.2A patent/CN116641724B/en active Active
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1571259A1 (en) * | 1988-07-05 | 1990-06-15 | Днепропетровский Государственный Проектный Институт "Днепрогипрошахт" | 1-beam frame support of mine working |
| JPH07127373A (en) * | 1993-10-29 | 1995-05-16 | Maeda Corp | Method and apparatus for constructing tunnel |
| CN105041353A (en) * | 2015-08-17 | 2015-11-11 | 河南理工大学 | Roadway anchor net re-jetting double-folded-shed surrounding rock control technology |
| CN106121689A (en) * | 2016-08-22 | 2016-11-16 | 福州大学 | A kind of excavation method of non-coal mine underground large stable chamber |
| US20190218910A1 (en) * | 2017-01-23 | 2019-07-18 | Shandong University Of Science And Technology | Asymmetric support structure of entry driven along gob-side under unstable roof in deep mines and construction method thereof |
| CN111058865A (en) * | 2019-12-18 | 2020-04-24 | 永城煤电控股集团有限公司 | Drilling and blasting rock roadway anchor net cable spraying construction process |
| CN113107556A (en) * | 2021-04-13 | 2021-07-13 | 中铁隧道集团二处有限公司 | Construction method of tunnel support based on NPR anchor cable |
| CN113494299A (en) * | 2021-07-22 | 2021-10-12 | 河海大学 | Tunnel rockburst grading prevention and control method using NPR material |
| CN114109436A (en) * | 2021-12-01 | 2022-03-01 | 中铁二局集团有限公司 | Large-span underground excavation construction method for subway station |
| CN114483085A (en) * | 2022-04-01 | 2022-05-13 | 中国矿业大学(北京) | Construction method of double-partition double-control system of soft rock tunnel |
| CN115163110A (en) * | 2022-04-01 | 2022-10-11 | 中国矿业大学(北京) | Double-partition double-control supporting system for soft rock tunnel |
| CN115726809A (en) * | 2022-11-14 | 2023-03-03 | 重庆大学 | Comprehensive control method for three-dimensional stope surrounding rock deformation under high-stress complex condition |
| CN116220769A (en) * | 2023-05-06 | 2023-06-06 | 中国矿业大学(北京) | Supporting method and supporting structure adopting microscopic NPR anchor rods or anchor cables |
| CN116220749A (en) * | 2023-05-06 | 2023-06-06 | 中国矿业大学(北京) | A prevent accuse structure for rock burst tunnel |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117552813A (en) * | 2024-01-12 | 2024-02-13 | 中国矿业大学(北京) | Surrounding rock reinforcement construction method for deep roadway |
| CN117552813B (en) * | 2024-01-12 | 2024-03-15 | 中国矿业大学(北京) | Surrounding rock reinforcement construction method for deep roadway |
Also Published As
| Publication number | Publication date |
|---|---|
| CN116641724B (en) | 2023-10-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110206542B (en) | Non-pillar self-entry mining method suitable for fully-mechanized top coal caving of thick coal seam | |
| CN108661643A (en) | It a kind of coal working face end adopts return channel and cuts top release shield lane method | |
| CN113090284B (en) | Roadway support method for soft and broken rock mass of underground mine | |
| CN116641724B (en) | Cooperative control method for high-prestress constant-resistance anchor rod and anchor cable of deep-buried soft rock roadway | |
| CN104533453A (en) | Substep dynamic coupling support method for roadway fault fracture zone | |
| CN103603676B (en) | A kind of scraper laneway support method | |
| CN113914860B (en) | Roof-cutting gob-side entry retaining method for non-compact solid filling working face | |
| CN111411962A (en) | Coal mine rock burst treatment method | |
| CN117552813B (en) | Surrounding rock reinforcement construction method for deep roadway | |
| CN107201913A (en) | A kind of fine vibration-reducing blasting construction method of cross-over tunnel | |
| CN113107525A (en) | Support system for extruded large-deformation tunnel, construction method and application | |
| CN105040712A (en) | High-pressure washing anchor planting and recharging comprehensive biological protection structure of soft and hard smashing interbedding type composite rock slope and construction method of structure | |
| CN113062760A (en) | Tunnel supporting method based on yielding anchor cable | |
| CN207229125U (en) | A kind of thrust device for being exclusively used in concrete filled steel tube pier stud | |
| CN112065394B (en) | Roof cutting and roadway retaining cooperative anchoring and protecting structure and construction method thereof | |
| CN103982197B (en) | A kind of deep tunnel discontinuous bivalve reinforcement means | |
| CN210483744U (en) | Self-adaptation composite lining structure suitable for large deformation soft rock tunnel | |
| CN115142854B (en) | Mine method tunnel single-layer lining structure system and construction method | |
| CN203296778U (en) | Rigid-flexible combination gob-side entry retaining roadway-side shoring device | |
| CN113073991B (en) | Roadway support method for extremely loose and broken rock mass of underground mine | |
| CN103291319A (en) | Rigid-flexible combination gob-side entry retaining method and rigid-flexible combination gob-side entry retaining device by aid of roadside supports | |
| CN210180295U (en) | Blasting construction structure | |
| CN109958456B (en) | Advanced reinforcement construction method for building tunnel in stratum without self-stability capability | |
| CN109441478B (en) | Method for damping and reinforcing IV-type and V-type surrounding rock advanced rod system arch of tunnel | |
| CN114278333A (en) | Construction method of ingate |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |