Laboratory test on the mechanical behavior of high-strength and large-deformation yield anchor cable

Abstract

The traditional anchor cable has limited deformation, which can be exceed easily in the slope reinforcement. In order to adapt to the slope reinforcement under complex geological conditions, a high-strength and large-deformation anchor cable is proposed. The anchor cable is characterized by high tonnage and large deformation. Its yield device consists of several yield sets, which are of the squeeze friction type. The initial yield force and stroke of the anchor cable can be adjusted according to the design. Laboratory tests of yield sets are carried out. Three types of yield sets that meet the requirements are found. Their initial yield strengths are 120 kN, 135 kN and 145 kN, and their yield strokes are greater than 200 mm. The test results show that the output force has a linear relationship with the length of the yield interface. Its working principle is clarified, and the key parameter calculation method is proposed. The yield anchor cables of 400 kN, 500 kN, 1 000 kN and 1 500 kN class are successfully developed. The laboratory tensile test results show that the yield stroke of the anchor cable can reach 200 mm. The force of each yield set is uniform and the displacement is synchronized. P anchor is used as a limit device to give full play to the ultimate bearing capacity of the steel strand. Indoor tests show that the ultimate bearing capacity for yield anchor cables of 400 kN and 500 kN class can reach 1 050 kN. The tonnage and stroke of the high-strength large-deformation yield anchor cable can be expanded as required. Its performance is better than that of the existing yield anchors. It can provide a new solution for large deformation reinforcement of slope.

Keywords

• yield anchor cable
• rock slope
• landslide reinforcement
• large deformation anchor cable
• high strength anchor cable