Tensile-shear continuous basalt fiber composite anchor rod adapting to large deformation of surrounding rock

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 rock, which comprises 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 mesh, a deformed steel bar sleeve, a tray and a nut. The steel spiral sleeve and the basalt fiber reinforced resin composite material can be coordinated and consistent in deformation, high tensile strength is reserved, and meanwhile the problem of rigidity coordination is solved. The steel spiral sleeve can continuously provide tensile force after the basalt fiber reinforced resin composite material inner core loses efficacy to adapt to large deformation of surrounding rock. The basalt fiber reinforced resin composite material protective layer and the carbon fiber mesh are attached to the outer side of the steel spiral sleeve, so that the internal structure of the anchor rod can be protected. The steel spiral sleeve is attached to the outermost layer, so that the shear strength of the anchor rod is greatly improved. According to the anchor rod, the large deformation performance and the shearing strength of an existing basalt fiber composite anchor rod can be enhanced, and the supporting stability is improved.

Description

technical field [0001] The patent of the present invention relates to the field of underground engineering support, in particular to a tensile-shear continuous basalt fiber composite anchor rod which can adapt to large deformation of surrounding rock. Background technique [0002] Reinforced anchor rods have been widely used as anchoring and supporting components in underground engineering. With the development in recent years, the application of fiber composite materials has brought the surrounding rock anchoring technology of underground engineering to a new level. Due to the advantages of high tensile strength, light weight, and good corrosion resistance, basalt fiber composite bars have received more and more attention in underground engineering support structures, and have gradually become a substitute for steel bars. [0003] However, the stress on the anchorage structure of underground engineering is complex. More and more researches and on-site monitoring data show ...

AI Technical Summary

Problems solved by technology

Although the basalt fiber composite reinforcement has many advantages, the basalt fiber composite reinforcement is a linear elastic material, which has problems such as high brittleness and no obvious warning under the condition of fracture instability, which has become a bottleneck restricting its development.

In addition, the shear strength of the basalt fiber composite reinforcement is about 26% of the tensile strength, and the effect of the anchorage structure against the shear slip of the surrounding rock is average. Therefore, the existing single basalt fiber composite material is difficult to resist. similar engineering disaster

Even though there are steel-continuous basalt fiber composite bars that combine the characteristics of steel bars and basalt fiber composite bars, there is a problem that the deformation of the fiber composite material and the inner core of the steel bar are not coordinated

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