A multi-stage reinforcement method for improving the seismic performance of existing pile groups

Abstract

The invention discloses a multi-stage reinforcement method for improving the seismic performance of existing pile groups, comprising the steps of: analyzing the distribution and stratum conditions of the existing pile groups, and determining a candidate reinforcement scheme corresponding to the existing pile groups; Linear theoretical calculation to analyze the first reinforcement effect corresponding to each candidate reinforcement scheme; determine the second reinforcement effect corresponding to each candidate reinforcement scheme based on the similarity ratio shaking table model test; determine the reinforcement effect corresponding to each candidate reinforcement scheme rate; determine the target reinforcement scheme based on the first reinforcement effect, the second reinforcement effect, and the reinforcement rate. The nonlinear theory is used to quickly analyze the internal force and deformation characteristics of the existing pile group under various candidate reinforcement schemes, and a similarity ratio model test is made for analysis and verification, so as to accurately and effectively analyze the mechanical properties of the existing pile group. Considering the nonlinear theoretical calculation of the pile foundation, the similarity ratio shaking table model test and the reinforcement rate, the target reinforcement scheme is finally determined.

Description

technical field [0001] The invention relates to the technical field of pile foundation performance enhancement, in particular to a multi-stage reinforcement method for improving the seismic performance of existing pile groups. Background technique [0002] Pile foundations are widely used in high-rise / super high-rise buildings, ports, water conservancy, and bridge projects due to their outstanding bearing capacity and deformation control capabilities. Pile foundations are also used when there are special requirements for precision instruments and power machinery equipment. The pile foundation may have problems such as diameter reduction, diameter expansion, mud inclusion, and segregation due to the construction process, and it will also be corroded by the environment during use, resulting in a bearing capacity lower than the design value. Due to its own defects or environmental corrosion and emergencies, the performance of the pile foundation will decline, and it cannot cont...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method for improving the seismic performance of existing pile groups with multi-stage reinforcement in view of the above-mentioned defects of the prior art, aiming at solving the problem that no better reinforcement scheme can be obtained in the prior art

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