Development and Application of Equipment for Anchor Cable with C-Shaped Tube Tension-Shear Test System

Abstract

Based on the phenomenon of serious tensile-shear failure of bolts and cables, domestic and foreign scholars’ research on the mechanical properties of bolts and cables has gradually changed from pure tensile to tensile-shear performance. To reduce the long-term bolt and cable breakage accidents in deep soft rock tunnels in coal mines, we independently developed a new type of support material—anchor cable with C-shaped tube and a corresponding tensile-shear test system. The system parameters are set through theoretical derivation, and the three main structures of the test system are designed with ANSYS: shear box, vertical loading reaction frame, and horizontal loading reaction frame. The numerical simulation results show that when the thickness of the shear box steel plate is 20 mm, the maximum strain is about 2.7‰. When the diameters of the vertical column and the horizontal bar are 220 mm and 80 mm, respectively, the maximum strains of the column and the horizontal bar are about 0.17‰ and 0.04‰, respectively. The strength and deformation of the three main structures meet the design requirements. The developed test system was tested on-site. The test results show that the system can perform tensile test and two different modes of the double shear test. The main structure has no obvious deformation during the test, meeting the design requirements. In addition, the rational design of the shear box eliminates the error caused by the shear block. The results show that the shear resistance of anchor cable with C-shaped tube is better than that of pure anchor cables. The research results can provide a reference for developing other similar test systems.

Analysis and Design of Protection Device for Anchor Cable Pull-Out in High-Stress Roadways

“…Their study results showed that the shear stress of anchors experienced an alternate change process from strong to weak, from weak to strong, and finally, from strong to weak. Tong et al [12] and Shan et al [13][14][15][16][17][18] proposed a combination of anchors and C-shaped canals for conducting double-shear tests. Their results proved that anchors and C-shaped canals could improve the transverse shear capacity of supporting materials during the shear process and strengthen the axial ultimate bearing capacity of anchors.…”