CN114017086A - Tensile-shear continuous basalt fiber composite anchor rod suitable for large deformation of surrounding rock - Google Patents
Tensile-shear continuous basalt fiber composite anchor rod suitable for large deformation of surrounding rock Download PDFInfo
- Publication number
- CN114017086A CN114017086A CN202111324234.8A CN202111324234A CN114017086A CN 114017086 A CN114017086 A CN 114017086A CN 202111324234 A CN202111324234 A CN 202111324234A CN 114017086 A CN114017086 A CN 114017086A
- Authority
- CN
- China
- Prior art keywords
- basalt fiber
- anchor rod
- tensile
- reinforced resin
- large deformation
- 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
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21D21/0006—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by the bolt material
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21D21/0013—Protection against corrosion
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
- E21D21/0033—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts having a jacket or outer tube
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/23—Dune restoration or creation; Cliff stabilisation
Abstract
The invention relates to the field of underground engineering support, and discloses a tensile-shear continuous basalt fiber composite anchor rod suitable for large deformation of surrounding rocks. The steel spiral sleeve can be in consistent deformation with the basalt fiber reinforced resin composite material, so that the high tensile strength is kept, and the problem of rigidity coordination is solved. The steel spiral sleeve can continuously provide tension after the inner core of the basalt fiber reinforced resin composite material fails, and is suitable for large deformation of surrounding rocks. The basalt fiber reinforced resin composite material protective layer and the carbon fiber mesh cloth are attached to the outer side of the steel spiral sleeve, so that the internal structure of the anchor rod can be protected. The outmost layer is attached with a threaded steel sleeve, so that the shear strength of the anchor rod is greatly improved. The anchor rod of the invention can enhance the large deformation performance and the shear strength of the existing basalt fiber composite anchor rod and improve the support stability.
Description
Technical Field
The invention relates to the field of underground engineering support, in particular to a tensile-shear continuous basalt fiber composite anchor rod capable of adapting to large deformation of surrounding rock.
Background
Steel bar anchor rods have been widely used as anchoring support members in underground works. With the development of recent years, the application of fiber composite materials brings the underground engineering surrounding rock anchoring technology to a new height. The basalt fiber composite bar is increasingly emphasized in underground engineering supporting structures due to the advantages of high tensile strength, light weight, good corrosion resistance and the like, and gradually becomes a substitute of a reinforcing steel bar.
However, the underground engineering anchoring structure is complex in stress, and more researches and field monitoring data show that the anchor rod is subjected to combined action of tension and shear, so that the requirement on the performance of the anchor rod is higher and higher, and not only higher tensile performance but also certain shear resistance is required. Especially, in recent years, the underground mining depth is continuously increased, the intensity and frequency of rock burst and rock burst are gradually increased, the phenomena of shear slip and large deformation of surrounding rocks are frequently caused, and a more effective means is needed for treating engineering disasters. Although the basalt fiber composite rib has a plurality of advantages, the basalt fiber composite rib is a linear elastic material, has the problems of high brittleness, no obvious sign under the condition of fracture instability and the like, and becomes a bottleneck restricting the development of the basalt fiber composite rib. In addition, the shear strength of the basalt fiber composite bar is about 26% of the tensile strength, and the effect of resisting shear slip of the surrounding rock when the basalt fiber composite bar is used as an anchoring structure is general, so that the anchor rod made of the existing single basalt fiber composite material is difficult to resist similar engineering disasters. Even though the steel-continuous basalt fiber composite bar combines the characteristics of the steel bar and the basalt fiber composite bar, the problem of inconsistent deformation of the fiber composite material and the inner core of the steel bar exists. The specific expression is that the elastic modulus of the steel is 2-3 times of that of the basalt fiber composite bar, and the phenomenon of slippage of a bonding interface caused by the inconsistent deformation of the inner core and the surface fiber of the steel bar is easy to occur. Therefore, the structure of the basalt fiber composite anchor rod needs to be improved, and the new continuous basalt fiber composite anchor rod is required to have higher shear strength and better ductility, so that the anchor rod cannot be damaged when dealing with the instability and large deformation of the surrounding rock, and the deformation coordination can be ensured.
It will thus be seen that the prior art is susceptible to further improvements and enhancements.
Disclosure of Invention
Based on the technical problems, the invention aims to provide the tensile-shear continuous basalt fiber composite anchor rod suitable for large deformation of surrounding rock, so that the anchor rod has stronger elongation performance and shear resistance for resisting large deformation on the basis of keeping good elongation performance of the original basalt fiber composite anchor rod.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the invention relates to a tensile-shear continuous basalt fiber composite anchor rod suitable for large deformation of surrounding rocks, which consists of a basalt fiber reinforced resin composite material inner core, a steel spiral sleeve, a basalt fiber reinforced resin composite material protective layer, a carbon fiber net cloth layer, a threaded steel sleeve, a tray and a nut.
The basalt fiber reinforced resin composite inner core and the basalt fiber reinforced resin composite protective layer are both composite materials formed by winding, die pressing or pultrusion and other forming processes of reinforced fiber materials and matrix materials. The ultimate tensile strength of the material rib is 2-3 times that of the steel bar, generally over 1000MPa, the elastic modulus is 40-50 GPa, and the material rib has extremely strong tensile property.
The steel spiral sleeve is made of high-strength steel plate materials, the steel plate materials have a high elastic modulus of about 200GPa, and the steel plate materials are wound into the steel spiral sleeve in a coiling mode.
Furthermore, the number of turns and the cross-sectional area of the steel spiral sleeve can be controlled, so that the longitudinal tensile elongation of the steel spiral sleeve is controlled to be 3-4 times of that of the original structure, namely, the elastic deformation modulus of the whole steel member is reduced by the method, the steel member and the basalt fiber composite material are kept consistent in rigidity, and the synergistic deformation effect is further realized.
The carbon fiber mesh cloth is a dense fishing net-shaped structure which is made by spirally winding carbon fibers left and right, and is wound and covered on the outer surface of the basalt fiber reinforced resin composite material protective layer.
Furthermore, the carbon fiber mesh has higher tensile strength and shear strength, and the shear resistance can be improved.
The inner side of the threaded steel sleeve forms a rough surface through a sand blasting or polishing process, so that the connection performance is further improved, and the outer side of the threaded steel sleeve is provided with threads, so that the anchorage device is convenient to install.
The middle of the tray is provided with a cavity and threads, the aperture of the cavity is matched with the outer threaded steel sleeve, and the inner threads can be combined and linked with the outer threaded steel sleeve.
The inner side threads of the nut can be combined and linked with the outer side thread steel sleeve.
The invention has the advantages that the implanted steel spiral sleeve has the characteristics of controllable elongation percentage and deformation rigidity, can be coordinated and consistent with the deformation of the basalt fiber reinforced resin composite material, not only ensures the original tensile strength, but also solves the rigidity coordination problem of the structure. The steel spiral sleeve can continuously provide tension after the inner core of the basalt fiber reinforced resin composite material fails. And a basalt fiber protective layer is attached to the outer side of the steel spiral sleeve to fill gaps among the steel spiral sleeves. The carbon fiber mesh cloth has higher tensile strength and shear strength, and can protect the fiber matrix inside from being damaged by shearing. The outermost threaded steel sleeve further increases the shear strength of the anchor rod.
In the practical application process, the anchor rod can be in the following working states: when the tensile stress of the anchor rod is below the ultimate tensile stress, the structure is in an elastic deformation stage, and the tensile stress is mainly born by the basalt fiber composite material. When the anchor rod structure is stretched and deformed greatly, after the basalt fiber reinforced resin composite material wrapped on the inner core and the outer side is subjected to brittle fracture failure, the implanted steel spiral sleeve still provides tension continuously, and the anchoring structure is allowed to still maintain a certain anchoring force after large deformation.
Further, when the shear stress of the anchor rod is below the limit shear stress, the structure is in an elastic deformation stage, and at the moment, the shear stress is mainly born by the outer threaded steel sleeve. When the structure is subjected to large shearing deformation, the basalt fiber composite material on the inner side is firstly broken. The carbon fiber cloth in the interlayer can provide a structure flexible shearing buffering effect. With the continuous increase of deformation, the implanted steel spiral sleeve continuously ensures the continuity of the structure after the outer threaded steel sleeve is broken along with shearing, and the continuous effect of shearing is maintained.
The anchor rod structure is simple in structure, the manufacturing process and the using process are very simple, the shear strength and the large deformation resistance of the anchor rod structure are improved on the basis of keeping the high tensile resistance of the basalt fiber composite bar, and the anchor rod structure has a more excellent anchoring effect.
Drawings
Fig. 1 is a cross-sectional view of a bolt body according to the present invention.
Fig. 2 is a schematic cross-sectional view of the bolt body of the present invention.
Fig. 3 is a general schematic view of the anchor rod of the present invention.
Fig. 4 compares the tensile strength of the continuous basalt fiber composite anchor rod with the tensile strength of the continuous basalt fiber composite anchor rod.
Figure 5 the present invention is compared to the tensile strength of a steel bar anchor.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. 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.
Referring to fig. 1-5, the present invention provides the following technical solutions:
a tensile-shear continuous basalt fiber composite anchor rod capable of adapting to large deformation of surrounding rock comprises a basalt fiber reinforced resin composite inner core 1, a steel spiral sleeve 2, a basalt fiber reinforced resin composite protective layer 3, a carbon fiber mesh 4, a threaded steel sleeve 5, a tray 6 and a nut 7 from inside to outside.
The steel spiral sleeve 2 is of a prefabricated structure, the elongation and the tensile rigidity of the steel spiral sleeve 2 are determined according to the actually measured elastic modulus of the inner core of the basalt fiber reinforced resin composite material, the steel spiral sleeve is realized by changing the number of turns and the cross section area, and the steel spiral sleeve can be generally controlled to be 40-50 GPa.
The steel spiral sleeve 2, the basalt fiber reinforced resin composite inner core 1 and the basalt fiber reinforced resin composite protective layer 3 are integrally cast.
Specifically, a prefabricated basalt fiber reinforced resin composite inner core 1 is sleeved into a prefabricated steel spiral sleeve 2 to integrally keep axial stability, basalt fibers are stretched to tightly wrap a spiral steel bobbin in a spiral weaving and winding mode, and a matrix is filled to form a basalt fiber reinforced resin composite protective layer 3.
Furthermore, before filling the matrix, the space of the steel spiral sleeve 2 is filled by winding basalt fiber around the gap, so that no hollow space exists in the rib body.
Further, the steel spiral sleeve 2 can be tensioned in advance before the matrix is filled, the rigidity of the anchor rod is further improved, the tension force used is lower than the compressive strength of the resin matrix used, the resin matrix is prevented from being clamped and broken, and the tension measured can be normally used when the tension is below 80% of the strength of the resin matrix.
The carbon fiber mesh cloth 4 is bonded to the outer side of the basalt fiber reinforced resin composite material protective layer 3 through epoxy resin.
The threaded steel sleeve 5 is bonded to the outer side of the carbon fiber mesh cloth 4 through epoxy resin.
The anchor rod body is sleeved in the tray 6, and the nut 7 is screwed on to complete the installation of the anchor rod.
In order to further embody the structural advantages of the invention, the anchor rod of the invention is subjected to a tensile numerical simulation test, the result is shown in fig. 4 and 5, the anchor rod with the diameter of 10mm is selected for analysis in the numerical simulation and the test, and the numerical simulation adopts finite element ABAQUS software.
The basalt fiber reinforced resin composite inner core 1 and the basalt fiber reinforced resin composite protective layer 3 both adopt linear elasticity to simulate the deformation characteristic before fracture, adopt brittle cracks to simulate the failure characteristic of the material after the ultimate strength is reached, and have the elastic modulus of 50GPa and the stress of 1100MPa of fracture failure. The steel spiral sleeve 2 adopts a linear elastic model, and the elastic modulus is 50 GPa. The threaded steel sleeve 5 adopts an ideal elastic-plastic model, the elastic modulus is 200GPa, and the yield strength is 400 MPa. The thickness of the carbon fiber mesh cloth 4 is small, and the carbon fiber mesh cloth can play a certain tensile and shearing resisting role, but the effect is limited, and the simulation is not considered.
As can be seen from figure 4, the tensile strength of the composite anchor rod is similar to that of a single continuous basalt fiber composite anchor rod, but the composite anchor rod has the capability of continuously bearing load after being broken, and the design of the composite anchor rod can overcome the problem of large brittleness of the basalt fiber composite rib and has certain capability of resisting large deformation.
As can be seen from figure 5, the tensile strength of the steel bar anchor rod is improved greatly, and the effect of improving the tensile strength is proved by the design of the invention.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (5)
1. A tensile-shear continuous basalt fiber composite anchor rod suitable for large deformation of surrounding rocks is composed of a basalt fiber reinforced resin composite inner core (1), a steel spiral sleeve (2), a basalt fiber reinforced resin composite protective layer (3), a carbon fiber mesh (4), a threaded steel sleeve (5), a base plate (6) and a nut (7).
2. The tensile-shear continuous basalt fiber composite anchor rod suitable for large deformation of surrounding rock according to claim 1, wherein: the tensile deformation modulus of the steel spiral sleeve (2) can be regulated and controlled, so that the rigidity of the steel spiral sleeve is consistent with that of the basalt fiber composite material.
3. The tensile-shear continuous basalt fiber composite anchor rod suitable for large deformation of surrounding rock according to claim 1, wherein: when the anchor rod is stretched and deformed greatly, after the basalt fiber reinforced resin composite inner core (1) and the basalt fiber reinforced resin composite protective layer (3) are subjected to brittle fracture failure, the implanted steel spiral sleeve (2) can still provide tension, and the anchoring structure is allowed to still maintain a certain anchoring force after large deformation.
4. The tensile-shear continuous basalt fiber composite anchor rod suitable for large deformation of surrounding rock according to claim 1, wherein: carbon fiber screen cloth (4) are bonded in the outer side of the protective layer (3) made of the wushu fiber reinforced resin composite material through epoxy resin, and the threaded steel sleeve (5) is bonded in the outer side of the carbon fiber screen cloth (4) through epoxy resin, so that the shear strength of the anchor rod can be greatly improved.
5. The tensile-shear continuous basalt fiber composite anchor rod suitable for large deformation of surrounding rock according to claim 1, wherein: after the basalt fiber reinforced resin composite material inner core (1) is sleeved into the steel spiral sleeve (2), the whole axial direction is kept still, the fibers wrap the spiral steel bobbin (2) in a winding mode, and a matrix is filled to form a basalt fiber reinforced resin composite material protective layer (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111324234.8A CN114017086B (en) | 2021-11-10 | 2021-11-10 | Tensile-shearing continuous basalt fiber composite anchor rod suitable for surrounding rock large deformation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111324234.8A CN114017086B (en) | 2021-11-10 | 2021-11-10 | Tensile-shearing continuous basalt fiber composite anchor rod suitable for surrounding rock large deformation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114017086A true CN114017086A (en) | 2022-02-08 |
| CN114017086B CN114017086B (en) | 2023-07-25 |
Family
ID=80062879
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111324234.8A Active CN114017086B (en) | 2021-11-10 | 2021-11-10 | Tensile-shearing continuous basalt fiber composite anchor rod suitable for surrounding rock large deformation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114017086B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4247224A (en) * | 1978-12-14 | 1981-01-27 | Ppg Industries, Inc. | Method for installing a mine roof bolt |
| SU1453037A1 (en) * | 1986-12-26 | 1989-01-23 | Специализированный проектно-изыскательский институт "Гидроспецпроект" | Soil-consolidating bolt |
| CN1936196A (en) * | 2005-09-22 | 2007-03-28 | 深圳市海川实业股份有限公司 | Fiber-reinforced resin anchoring rod |
| CA2659568A1 (en) * | 2006-05-29 | 2007-06-12 | Kenichi Tsukamoto | Fibre reinforced plastic drilling anchor |
| CN101398357A (en) * | 2008-10-17 | 2009-04-01 | 同济大学 | Test piece end reinforcing method in test for FRP rib/anchor rod tensile property |
-
2021
- 2021-11-10 CN CN202111324234.8A patent/CN114017086B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4247224A (en) * | 1978-12-14 | 1981-01-27 | Ppg Industries, Inc. | Method for installing a mine roof bolt |
| SU1453037A1 (en) * | 1986-12-26 | 1989-01-23 | Специализированный проектно-изыскательский институт "Гидроспецпроект" | Soil-consolidating bolt |
| CN1936196A (en) * | 2005-09-22 | 2007-03-28 | 深圳市海川实业股份有限公司 | Fiber-reinforced resin anchoring rod |
| CA2659568A1 (en) * | 2006-05-29 | 2007-06-12 | Kenichi Tsukamoto | Fibre reinforced plastic drilling anchor |
| CN101398357A (en) * | 2008-10-17 | 2009-04-01 | 同济大学 | Test piece end reinforcing method in test for FRP rib/anchor rod tensile property |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114017086B (en) | 2023-07-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7650742B2 (en) | Cable made of high strength fiber composite material | |
| CN102936941B (en) | Composite pipe concrete composite structure | |
| KR101260537B1 (en) | Method for reinforcing a metal tubular structure | |
| CN101886347B (en) | Fiber prestress rope containing high-toughness wear-resistant sleeve and fabricating method thereof | |
| KR102112960B1 (en) | Frp-mesh for reinforcing concrete | |
| CN202826546U (en) | Composite pipe concrete combination structure | |
| CN201809660U (en) | Fiber pre-stressed rope with high-toughness wear-resistant sleeve | |
| CN114017086A (en) | Tensile-shear continuous basalt fiber composite anchor rod suitable for large deformation of surrounding rock | |
| JP4288122B2 (en) | Terminal fixing method and terminal fixing body of high-strength fiber composite cable | |
| CN113039332B (en) | Composite steel bar | |
| CN106639477A (en) | Built-in damping beam member with anti-seismic and self-healing performance | |
| CN111535178A (en) | Prestressed FRP (fiber reinforced Plastic) rib capable of being used for clamping piece anchoring and preparation method thereof | |
| KR100473073B1 (en) | Fiber reinforced polymer bar enhanced adhesion for reinforcing concrete structure | |
| JP4712408B2 (en) | Dry hybrid reinforcing fiber tendon | |
| JPH0544301A (en) | Tubular tension material | |
| JPH08199733A (en) | Fiber reinforced plastic rod | |
| CN2573772Y (en) | Prestressed FRP reinforcement adhering fastening body device | |
| CN203905504U (en) | Terminal fixing structure of compound linear body | |
| KR101290175B1 (en) | Seismic Retrofit of Reinforced Concrete Columns Using Multi-Layers of FRP Wires Jackets | |
| JPH05302490A (en) | Fiber-reinforced concrete wall body of departure/ arrival part in tunnel excavation shaft | |
| JP5869930B2 (en) | Reinforced structure of concrete structure and concrete structure | |
| RU2709571C2 (en) | Armature cable | |
| JPH0742310A (en) | Fiber composite reinforcing member for reinforcing concrete and end fixing method thereof | |
| KR200299699Y1 (en) | Fiber reinforced plastic bar for reinforcing concrete structure | |
| KR200298950Y1 (en) | Concrete structure with fiber reinforced plastic bar as reinforcement thereof |
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 |