A Determination Method for Optimum Anchorage Length of Prestressed Anchor Rod in Deep Foundation Pit

Abstract

The invention discloses a determining method for the optimal anchorage length of deep foundation pit pre-stressed anchor rods. The determining method includes the following steps: an overall foundation pit slope is divided into n layers from top to bottom; the most dangerous slip surface of the foundation pit slope is determined; the foundation pit slope stability difference compensation factor delta FS is determined; the proportions of the stability difference compensation factor borne by the anchor rods on all layers are divided; strengthening anti-skidding force values needed by the anchor rods on all layers of the foundation pit slope are determined; strengthening pre-stressed values of homogeneous soil layers and non-mean-value heterogeneous layered soil are determined; and according to the determined strengthening pre-stressed values, the optimal anchorage length of the anchor rods on all layers is determined, and the optimal design length of the anchor rods on all layers is further determined. The determining method has the beneficial effects that the design length of the anchor rods is greatly reduced and optimized; on the premise that safety and stability of the foundation pit slope are guaranteed, the engineering cost is saved, and the construction period is shortened, so that the pre-stressed anchor rods are used to the maximum degree.

Description

technical field [0001] The invention relates to the technical field of reinforcement and management of deep foundation pit slope engineering and landslide prevention and control engineering, in particular to a method for measuring the optimal anchorage length of slope bolt reinforcement. Background technique [0002] In recent years, prestressed anchorage technology improves the strength and self-stabilization ability of rock and soil mass due to the high tensile strength of prestressed steel bars, fully taps the potential of rock and soil mass, effectively saves engineering costs and is conducive to construction. Safety, which has been more and more widely used in the field of geotechnical engineering, has become one of the most cost-effective methods to improve the stability of geotechnical engineering and solve complex and difficult problems. Especially in landslide prevention and deep foundation pit slope engineering reinforcement, prestressed anchor bolts are flexible i...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome defects such as the high cost of the reinforcement project and the long construction period in order to overcome the uniform reinforcement length of the anchor rod in the traditional reinforcement method, and propose a method for measuring the optimal anchorage length of the prestressed anchor rod in deep foundation pits. Considering that the sliding surface is a circular arc surface, the length of the anchorage section of the anchor is optimized. Through the analysis of the reinforcement mechanism of the prestressed anchor slope and the evaluation of the reinforcement stability, it is found and determined that the prestressed anchor is determined. The optimal length of the anchorage section under the premise that the rod can exert its maximum potential, and a design and measurement method for the optimal length of the anchorage section of the prestressed anchor rod are proposed, so as to save engineering cost and construction under the premise of ensuring the safety and stability of the foundation pit slope The purpose of the duration

Images