Development and Engineering Application of Cement-Based Full Length Anchoring Material
Abstract
In response to the anchor cable support failing in deep and complicated geological tunnel conditions, this paper theoretically analyzes the deficiency of end anchor, and innovatively proposes full-length anchor cable anchoring to enhance shear capacity, so as to increase the overall stability of the support system. By improving cement-based materials, it was possible to obtain a novel kind of high-strength anchoring material. The bolt pull-out test and acoustic emission test of the new material were carried out and compared with three kinds of traditional anchoring materials. The experimental findings reveal that the content of fly ash (A) is 15%, expansion agent (B) is 3%, Water Reducer (C) is 0.2%, accelerator (D) is 1%, and Huaqiansu (E) is 1%, the optimal combination of modified anchoring materials can be obtained; the new anchoring material has higher bonding strength and enhanced tensile resistance. It is discovered that the pulling force of the anchor cable is steady after using the new material for full-length anchoring in the project site. It also successfully controls the surrounding rock's deterioration. The roadway surrounding rock maximum displacement was 20-27 mm, the realization of the roadway's stability control.