CN107725088B - Rock burst resistance and large-deformation wing type splitting energy-absorbing anchor rod and structure - Google Patents

Rock burst resistance and large-deformation wing type splitting energy-absorbing anchor rod and structure Download PDF

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Publication number
CN107725088B
CN107725088B CN201711059405.2A CN201711059405A CN107725088B CN 107725088 B CN107725088 B CN 107725088B CN 201711059405 A CN201711059405 A CN 201711059405A CN 107725088 B CN107725088 B CN 107725088B
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China
Prior art keywords
anchor rod
anchoring
splitting
energy
rock burst
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CN201711059405.2A
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CN107725088A (en
Inventor
张传庆
刘振江
刘三兵
周辉
林松清
崔国建
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Wuhan Institute of Rock and Soil Mechanics of CAS
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Wuhan Institute of Rock and Soil Mechanics of CAS
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Priority to CN201711059405.2A priority Critical patent/CN107725088B/en
Publication of CN107725088A publication Critical patent/CN107725088A/en
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D21/00Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
    • E21D21/0026Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D20/00Setting anchoring-bolts
    • E21D20/02Setting anchoring-bolts with provisions for grouting

Abstract

The invention belongs to the technical field of anchor rods, and discloses a rock burst resistant and large-deformation wing type splitting energy-absorbing anchor rod, which comprises: the anchor rod body, the tray and the nut are arranged at the tail of the anchor rod body; the anchor wing, the anchor wing radially sets up on the stock body outer wall. The invention provides a rock burst and large deformation wing type splitting energy-absorbing anchor rod and a structure, which can effectively improve the control effects of energy absorption yielding and deep underground engineering rock burst or large deformation and other disasters.

Description

Rock burst resistance and large-deformation wing type splitting energy-absorbing anchor rod and structure
Technical Field
The invention relates to the technical field of anchor rods, in particular to a rock burst resistant and large-deformation wing type splitting energy-absorbing anchor rod and a structure.
Background
The bolting technology has been used for over a hundred years, and has become one of the widely applied supporting modes of ground engineering such as rock-soil slopes and foundation pits and underground engineering such as tunnels and stopes, and is particularly remarkable in the stability control of surrounding rocks of the underground engineering. The conventional anchor rod is used for an underground shallow part and can be divided into a mechanical anchor rod, a bonding anchor rod and a friction anchor rod according to different stress modes. The mechanical anchor rod is also the expansion shell type anchor rod, and the bonding anchor rod has high rigidity and strength, but small ductility and poor deformability; the friction type anchor rod, the pipe seam type and the hydraulic expansion type anchor rod have large deformation capacity but low bearing capacity.
At present, the infrastructure construction is vigorously developed in China, the construction in the fields of water conservancy and hydropower, traffic, civil engineering, energy, nuclear waste storage and the like is intensively developed, and related underground engineering shows the trend of deep burying and growing up. Factors such as deep high stress, high ground temperature, high osmotic pressure and strong disturbance seriously affect the stability of the underground engineering surrounding rock, various engineering disasters are increasing day by day, particularly the factors include large deformation of soft rock, rock burst of hard rock and the like, and great difficulty is brought to excavation and support of deep underground engineering. Traditional anchor bolt support faces serious challenge in deep underground engineering, and ordinary bonding formula stock often leads to the stock failure destruction because of its deformation is not enough under the condition of rock mass big deformation, and friction formula stock will cause the body of rod fracture and lose the supporting effect once reaching the rupture load, and ordinary stock elongation is not enough, after extending intensity reduces and can not resist shock etc. characteristics can not adapt to the deformation destruction characteristic of deep rock mass. However, in practical engineering application, many traditional anchor rods are still widely applied to deep underground engineering, so that not only is the supporting cost increased, but also huge potential safety hazards are buried.
Therefore, the deep underground engineering surrounding rock bolt support not only has high bearing capacity, but also has larger deformation capacity to transfer and absorb the energy generated by the deformation of the surrounding rock, and is called as an energy absorption bolt or a yielding bolt, a yielding bolt and the like. The energy-absorbing anchor rod can be divided into an anchor head energy-absorbing type and a rod body energy-absorbing type according to the energy-absorbing principle, the anchor head energy-absorbing type anchor rod is characterized in that an energy-absorbing device (a sliding sleeve on a rod body, a spring washer behind a cushion plate and the like) capable of continuously deforming is additionally arranged at an inner anchoring section or an outer anchor head, the rod body energy-absorbing type anchor rod absorbs energy by utilizing the extension of the rod body, the rod body material has the characteristics of high strength and large deformation capacity, or the rod body is designed into a special shape (such as a corrugated shape).
Various types of energy-absorbing anchor rods in China also emerge endlessly, but the existing anchor rods still have a plurality of defects: for example, patent publication No. CN201981537U, "water-swelling elastic rock burst-resistant anchor rod", publication No. CN204691804U, "an impact-resistant energy-absorbing anchor rod tray suitable for deep underground engineering", publication No. CN205743946U, "an impact-resistant energy-absorbing anchor rod tray", and the like, mainly add energy-absorbing yielding devices (spring washers, deformable cylinders, and the like) at the external anchoring end, so that the structure is simple, the cost is low, the installation is convenient, and the energy-absorbing and stress-diffusing effects are good; however, the whole deformation energy-absorbing yielding capacity is limited, and the exposed energy-absorbing device faces the problems of occupying the clearance of the section, needing rust prevention and corrosion prevention, influencing construction and the like. The mining anchor rod is characterized by comprising a core body, a core rod, a bolt and a bolt, wherein the core rod is provided with a high-stress large-deformation rock mass mining function and a high-strength energy absorption function; however, the rod body tends to come into direct contact with air, and is poor in corrosion resistance and durability. The energy-absorbing anchor rod comprises a rod body, a public number CN102286975A, a public number CN104265339A, an extrusion and friction type energy-absorbing anchor rod, a public number CN101858225A, a constant-resistance large-deformation anchor rod and the like, and is mainly characterized in that the coordinated deformation of the anchor rod and surrounding rock is realized through deformation or sliding of a yielding device (sleeve) on the rod body, so that the purposes of energy absorption and yielding are achieved; but the manufacturing is complex, the construction difficulty is large, the cost is high, and the popularization and the application in the actual engineering are not facilitated. In addition, most energy-absorbing anchor rods at present are of two-point anchoring structures, namely an inner anchoring section unit and an outer anchoring section unit, and once one unit fails, the whole anchor rod is damaged.
Disclosure of Invention
The invention provides a rock burst and large deformation wing type splitting energy-absorbing anchor rod and a structure, which can effectively improve the control effects of energy absorption yielding and deep underground engineering rock burst or large deformation and other disasters.
In order to solve the technical problem, the invention provides a rock burst resistant and large deformation wing type splitting energy-absorbing anchor rod, which comprises:
the anchor rod body, the tray and the nut are arranged at the tail of the anchor rod body;
the anchor wing, the anchor wing radially sets up on the stock body outer wall.
Further, the outer wall of the anchor rod body is a smooth surface.
Further, the anchoring wing includes: a main body;
the main body is radially arranged on the anchor rod body;
one side of the main body towards the tail of the anchor rod body is provided with a splitting part.
Further, the cleaving part includes: the device comprises an impact edge and splitting arc surfaces arranged on two sides of the impact edge;
the splitting cambered surface is connected with the side wall of the main body.
Further, the splitting arc surface is an elliptical arc surface.
Further, the splitting arc surface is an arc surface.
Furthermore, the number of the anchoring wings is two or more, so that a group is formed;
two or more than two anchor wings are arranged on the anchor rod body and are positioned on the same circular surface, and the included angle of any two adjacent anchor wings is equal.
Furthermore, a plurality of groups of anchoring wings are axially arranged on the anchor rod body;
two adjacent groups of anchoring wings are arranged on the anchor rod body in a staggered manner.
The utility model provides an anti rock burst and big deformation wing formula splitting type energy-absorbing structure, includes: the rock burst resistant and large deformation wing type splitting energy absorption anchor rod and the anchoring agent are arranged in the cavity;
the anchoring agent is coated on the rock burst resistant and large-deformation wing type splitting energy-absorbing anchor rod, is arranged in the drill hole, and is pressed on the rock wall through the tray and the nut;
the anchoring agent is filled between the rock burst resistant and large-deformation wing type splitting energy-absorbing anchor rod and the wall of the drilled hole.
Further, the anchoring agent includes: cement mortar or resin.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
according to the rock burst resistant and large-deformation wing type splitting energy-absorbing anchor rod provided by the embodiment of the application, the anchor wings are arranged on the rod body of the anchor rod, so that on one hand, the rod body can be positioned at the center of a drilled hole through the anchor wings, and the wrapping effect and the overall anchoring performance of anchoring agents such as cement paste or resin are improved; meanwhile, when the anchoring wing is subjected to rock burst or large deformation and the like, the anchoring wing splits the anchoring agent and keeps relatively stable resistance to slide in the drill hole, generates coordinated deformation with the surrounding rock in space and time, absorbs and transfers energy released by the surrounding rock, and is suitable for disaster control of deep underground engineering rock burst or large deformation and the like.
Furthermore, multi-point anchoring is achieved by arranging multiple groups of anchoring wings and multiple anchoring wings in each group, the strength and the deformability of each unit can be fully adjusted, the interaction between the anchor rod and the surrounding rock is enhanced, each unit of the anchor rod works independently, the failure of one unit cannot lead to the failure of the whole anchor rod, and the rest units can continue to act.
Furthermore, the splitting acting force is intensively applied by setting the impact edges, so that the splitting efficiency is improved; meanwhile, the splitting effect is further enlarged by matching with the splitting cambered surface, so that the stress is uniform, and the relatively stable energy absorption effect is ensured. Meanwhile, the splitting effect can be limited to the vicinity of the splitting cambered surface to a certain extent, so that the process of absorbing and converting energy is stable and is at a relatively low intensity, the stability of the energy absorption structure is maintained, and the energy absorption structure is suitable for long-term high-reliability support.
Furthermore, the invention has the advantages of simple structure, easy manufacture, low cost, convenient installation, safety, reliability and wide applicability. The special energy absorption device is not needed to be arranged at the outer anchoring section, only conventional nuts, trays and the like are needed to be installed, the exposed part is short, and later construction influence, corrosion prevention, rust removal and the like are not needed to be considered. The rod body is completely wrapped by anchoring agents such as cement paste or resin and the like, is basically isolated from air, has good corrosion resistance and durability, and is suitable for permanent support of underground engineering.
Drawings
FIG. 1 is a schematic diagram of a rock burst resistant and large deformation wing type split energy absorption structure provided by the present invention;
fig. 2 is a schematic structural view of a rock burst resistant and large deformation wing type split energy-absorbing anchor rod according to a first embodiment of the present invention;
FIG. 3 is a left side view of FIG. 2;
FIG. 4 is a schematic structural diagram of an anchoring wing according to a first embodiment of the present invention;
FIG. 5 is a top view of FIG. 4;
fig. 6 is a schematic diagram of a rock burst resistant and large deformation wing type split energy absorption structure according to a second embodiment of the present invention;
fig. 7 is a schematic structural view of an anchoring wing according to a second embodiment of the present invention.
Detailed Description
The embodiment of the application can effectively improve the energy-absorbing yielding and deep underground engineering rock burst or large deformation disaster control effects through providing the rock burst resistant and large deformation wing type splitting energy-absorbing anchor rod and the structure.
In order to better understand the technical solutions, the technical solutions will be described in detail below with reference to the drawings and the specific embodiments of the specification, and it should be understood that the embodiments and specific features of the embodiments of the present invention are detailed descriptions of the technical solutions of the present application, and are not limitations of the technical solutions of the present application, and the technical features of the embodiments and examples of the present application may be combined with each other without conflict.
Example one
Referring to fig. 1, a rockburst-resistant and large-deformation wing-type cleavage-type energy-absorbing anchor rod includes:
the anchor rod body 3, the tray 2 and the nut 1 are arranged at the tail part of the anchor rod body;
and the anchoring wings 4 are radially arranged on the outer wall of the anchor rod body 3. On one hand, the anchor rod is positioned at the central position of the drilling hole 6, and the wrapping effect and the integral anchoring effect of the anchoring agent are ensured. Meanwhile, when the deep underground engineering is subjected to rock burst or large deformation and the like, the anchoring wings 4 split the anchoring agent 5 and keep relatively stable resistance to slide in the drill holes 6, generate coordinated deformation with surrounding rocks in space and time, absorb energy released by the transferred surrounding rocks, and are suitable for disaster control of deep underground engineering rock burst or large deformation and the like.
Generally, the outer wall of the anchor rod body 3 is smooth. Facilitating relative sliding movement of the bodies 3.
With reference to fig. 2, 3 and 3, in particular, the anchoring wing 4 comprises: a main body 43. The body 43 is arranged radially on the bolt body 3.
One side of the main body 43 facing the tail of the anchor rod body 3 is provided with a splitting part for breaking the anchoring agent.
Referring to fig. 5, specifically, the cleaving part includes: the device comprises an impact edge 41 and splitting arc surfaces 42 arranged on two sides of the impact edge 41;
the splitting cambered surface 42 is connected with the side wall of the main body 43.
When the anchoring agent is split, the impact edges 41 break the anchoring agent, the anchoring agent is further separated towards two sides through the splitting arc surface 42, efficient and reliable splitting operation is achieved, in the process, the stress surface is mainly concentrated on the splitting arc surface 42, therefore, the crushing process is mainly concentrated near the splitting arc surface, the process of absorbing and converting energy is stable, the energy absorbing structure is in a relatively low intensity, the stability of the energy absorbing structure is maintained, and the energy absorbing structure is suitable for long-term high-reliability support.
Generally, the splitting arc surface 42 is an elliptical arc surface, and has relatively less axial impact and less damage intensity.
Furthermore, the number of the anchoring wings 4 is two or more, and a group is formed; two or more than two anchor wings 4 are arranged on the anchor rod body 3 and are positioned on the same circular surface, and the included angles of any two adjacent anchor wings are equal. Thereby make the stock body 3 stably reside in the drilling center, promote anchoring agent 5 parcel effect simultaneously.
A plurality of groups of anchoring wings can be axially arranged on the anchor rod body 3; two adjacent groups of anchoring wings are arranged on the anchor rod body in a staggered mode, so that multi-line splitting can be achieved, and a large amount of energy can be absorbed.
Typically, sets of anchoring wings are provided at or near the head end of the shank body 3, i.e. at a location that is positioned deep within the borehole. The position of the hole opening close to the drilling hole is provided with few or even no anchoring wings; the exact setting is of course chosen according to the actual needs.
On the other hand, the body 43 may be a prism with a trapezoidal or variable-section trapezoidal section, so that the pressure of rock burst and deformation can be concentrated on the body 43, and energy absorption can be realized by deformation or increase of kinetic friction force.
This embodiment is still based on an anti rock burst and big deformation wing formula splitting type energy-absorbing structure, include: the rock burst and large deformation wing type split energy absorption anchor rod and the anchoring agent according to claim 1;
the anchoring agent is coated on the rock burst resistant and large-deformation wing type splitting energy-absorbing anchor rod, is arranged in the drill hole, and is pressed on the rock wall through the tray and the nut;
and the anchoring agent 5 is filled between the rock burst resistant and large-deformation wing type splitting energy-absorbing anchor rod and the wall of the drilled hole.
Generally, the anchoring agent comprises: cement mortar or resin.
Example two
Referring to fig. 6 and 7, on the basis of the first embodiment, the splitting arc surface 42 is configured as an arc surface, so that the impact surface is relatively increased, and the severity of the damage can be improved. Can be arranged according to the needs.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
according to the rock burst resistant and large-deformation wing type splitting energy-absorbing anchor rod provided by the embodiment of the application, the anchor wings are arranged on the rod body of the anchor rod, so that on one hand, the rod body can be positioned at the center of a drilled hole through the anchor wings, and the wrapping effect and the overall anchoring performance of anchoring agents such as cement paste or resin are improved; meanwhile, when the anchoring wing is subjected to rock burst or large deformation and the like, the anchoring wing splits the anchoring agent and keeps relatively stable resistance to slide in the drill hole, generates coordinated deformation with the surrounding rock in space and time, absorbs and transfers energy released by the surrounding rock, and is suitable for disaster control of deep underground engineering rock burst or large deformation and the like.
Furthermore, multi-point anchoring is achieved by arranging multiple groups of anchoring wings and multiple anchoring wings in each group, the strength and the deformability of each unit can be fully adjusted, the interaction between the anchor rod and the surrounding rock is enhanced, each unit of the anchor rod works independently, the failure of one unit cannot lead to the failure of the whole anchor rod, and the rest units can continue to act.
Furthermore, the splitting acting force is intensively applied by setting the impact edges, so that the splitting efficiency is improved; meanwhile, the splitting effect is further enlarged by matching with the splitting cambered surface, so that the stress is uniform, and the relatively stable energy absorption effect is ensured. Meanwhile, the splitting effect can be limited to the vicinity of the splitting cambered surface to a certain extent, so that the process of absorbing and converting energy is stable and is at a relatively low intensity, the stability of the energy absorption structure is maintained, and the energy absorption structure is suitable for long-term high-reliability support.
Furthermore, the invention has the advantages of simple structure, easy manufacture, low cost, convenient installation, safety, reliability and wide applicability. The special energy absorption device is not needed to be arranged at the outer anchoring section, only conventional nuts, trays and the like are needed to be installed, the exposed part is short, and later construction influence, corrosion prevention, rust removal and the like are not needed to be considered. The rod body is completely wrapped by anchoring agents such as cement paste or resin and the like, is basically isolated from air, has good corrosion resistance and durability, and is suitable for permanent support of underground engineering.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.

Claims (3)

1. The utility model provides an anti rock burst and big deformation wing formula splitting type energy-absorbing stock which characterized in that includes:
the anchor rod body, the tray and the nut are arranged at the tail of the anchor rod body;
the anchoring wings are radially arranged on the outer wall of the anchor rod body;
the outer wall of the anchor rod body is a smooth surface;
the anchoring wing includes: a main body;
the main body is radially arranged on the anchor rod body;
a splitting part is arranged on one side of the main body facing the tail part of the anchor rod body;
the splitting part includes: the device comprises an impact edge and splitting arc surfaces arranged on two sides of the impact edge;
the splitting arc surface is connected with the side wall of the main body;
the splitting arc surface is an elliptical arc surface or an arc surface;
the number of the anchoring wings is two or more, so that a group is formed;
the two or more than two anchoring wings are arranged on the anchor rod body and are positioned on the same circular surface, and the included angles of any two adjacent anchoring wings are equal;
a plurality of groups of anchoring wings are axially arranged on the anchor rod body;
two adjacent groups of anchoring wings are arranged on the anchor rod body in a staggered manner;
the main body can be arranged into a prism with a trapezoidal or variable-section trapezoidal section, so that pressure from rock burst and deformation is concentrated on the main body, and energy absorption is realized through deformation or increase of dynamic friction force;
when the anchoring wing is subjected to rock burst or large deformation and the like, the anchoring wing splits the anchoring agent, keeps relatively stable resistance to slide in the drill hole, generates coordinated deformation with surrounding rocks in space and time, absorbs and transfers energy released by the surrounding rocks, and is suitable for disaster control of deep underground engineering rock burst or large deformation and the like;
when the anchoring agent is split, the impact edges break the anchoring agent, the anchoring agent is separated towards two sides through the splitting arc surface, efficient and reliable splitting operation is achieved, in the process, the stress surface is concentrated on the splitting arc surface, the breaking process is mainly concentrated near the splitting arc surface, the process of absorbing and converting energy is stable, the stability of the energy absorption structure is maintained, and the method is suitable for long-term high-reliability support.
2. The utility model provides an anti rock burst and big deformation wing formula splitting type energy-absorbing structure which characterized in that includes: the rock burst and large deformation wing type split energy absorption anchor rod and the anchoring agent according to claim 1;
the rock burst resistant and large deformation wing type splitting energy absorption anchor rod coated by the anchoring agent is arranged in a drill hole and is pressed on a rock wall through the tray and the nut;
the anchoring agent is filled between the rock burst resistant and large-deformation wing type splitting energy-absorbing anchor rod and the wall of the drilled hole.
3. The rockburst and large deformation wing-type cleavage-type energy absorbing structure according to claim 2, wherein the anchoring agent includes: cement mortar or resin.
CN201711059405.2A 2017-11-01 2017-11-01 Rock burst resistance and large-deformation wing type splitting energy-absorbing anchor rod and structure Active CN107725088B (en)

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CN107725088B true CN107725088B (en) 2022-05-03

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Publication number Priority date Publication date Assignee Title
CN108222990A (en) * 2018-03-23 2018-06-29 东北大学 A kind of M types are released can anchor pole

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CA2785245C (en) * 2009-12-22 2016-09-13 Mansour Mining Technologies Inc. Anchor tendon with selectively deformable portions
CN203742638U (en) * 2014-01-16 2014-07-30 湖南科技大学 Anchoring and energy-absorbing anchor-rod device used for controlling deep rock mass
CN203962011U (en) * 2014-07-10 2014-11-26 中国电建集团中南勘测设计研究院有限公司 A kind of rock bolt of segmentation anchoring
CN105041355B (en) * 2015-07-29 2017-07-28 中国科学院武汉岩土力学研究所 The anti-rock burst anchor pole of broaching formula
CN106640161A (en) * 2016-11-15 2017-05-10 北京科技大学 High-strength energy-absorbing anchor rod with good extensive quantity
CN107119681B (en) * 2017-06-13 2019-11-29 江西丰强科技发展有限公司 A kind of modular Pulling-Resistant Anchor Rod

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