Design optimization method for pre-stressed anchor cable in anchoring type retaining structure

Abstract

The invention discloses a design optimization method for a pre-stressed anchor cable in an anchoring type retaining structure. FLAC3D numerical simulation is introduced into a traditional pre-stressed anchor cable design process, a load-displacement curve, obtained through numerical simulation, in the drawing process of a pre-stressed anchor cable is made to approach a load-displacement curve obtained through a field drawing test by adjusting slurry bonding force parameters of a Cable unit, and the more accurate rock-soil body-slurry bonding strength can be obtained. The defects that in a traditional design method, design is too conservative and engineering materials are wasted due to the fact that the limit bonding strength takes the lower limit of a reference value interval are overcome. According to the method, FLAC3D numerical simulation and on-site pull-out test results are combined, the number of times of pre-stressed anchor cable on-site pull-out tests needing to be carried out can be greatly reduced, and meanwhile parameter analysis can be carried out on the basis of the more accurate rock-soil body-slurry bonding strength, obtained through optimization, of different soil layers; the method has important significance for further optimizing the design scheme of the pre-stressed anchor cable and reducing the construction cost.

Description

technical field [0001] The invention belongs to the field of geotechnical engineering, and in particular relates to a design optimization method for prestressed anchor cables in an anchor-stayed retaining structure. Background technique [0002] The prestressed anchor cable reinforcement technology is an anchoring technology that fixes the anchor cable inside the rock and soil mass through grouting in the hole, and applies prestress by tension to reinforce the rock and soil mass. Because it has the advantages of being able to fully adjust and improve the self-strength and self-stabilizing ability of the rock and soil mass, reduce the self-weight of the support structure, and ensure the safety and stability of the construction, it usually forms an anchor cable (rod) together with the retaining structure. The support system is widely used in foundation pit support. [0003] In recent years, prestressed anchor cable technology has also made some progress and development: Chine...

AI Technical Summary

Problems solved by technology

[0005] However, in the existing prestressed anchor cable design methods, the ultimate bond strength between the anchorage section of the prestressed anchor cable and the soil layer is often taken as the lower limit of the reference value range of the ultimate bond strength of different soil layers in the code, resulting in The value of the length is too large, and the design is too conservative, which is not conducive to saving the project cost

In addition, the on-site pull-out test is only used to verify whether the preliminary design meets the requirements of the ultimate bearing capacity, and has not established a quantitative relationship with the optimization of the design plan. As a result, the value of the on-site pull-out test results has not been fully utilized, which is contrary to high Quality Development Concept

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