Study on the Group Anchoring Effect of Retractable Anchor Cables and Parameter Analysis

Abstract Abstruct: The group anchor effect of recoverable anchor cable directly affects the overall bearing capacity of foundation pit supporting structure, but there is no systematic quantitative analysis method at present. In this paper, the calculation model of bearing capacity of single recoverable anchor cable is constructed, and the calculation formula of bearing capacity is derived. Then, based on the actual arrangement of group anchors, the calculation model of additional force transfer of adjacent anchor cables in the upper, lower, left and right layers is established, and the formulas of additional force in each direction are derived, and the group anchor effect coefficient is used as the quantitative index. By comparing the theoretical calculation results of this paper with the theoretical and numerical simulation results of the existing literature, the rationality of the calculation method is verified. The results show that the group anchor effect coefficient increases with the increase of soil cohesion and anchor cable arrangement spacing, and decreases with the increase of anchor cable arrangement inclination, calculation of anchor cable anchorage section length and transmission anchor cable anchorage section length. The research results can provide theoretical support and quantitative basis for the design of recyclable anchor cable group.