Multi-section reinforced existing pile group anti-seismic property improving method

Abstract

The invention discloses a multi-section reinforced existing pile group anti-seismic property improving method. The method comprises the steps that distribution of existing pile groups and stratum conditions are analyzed, and candidate reinforcing schemes corresponding to the existing pile groups are determined; a first reinforcing effect corresponding to each candidate reinforcing scheme is calculated and analyzed on the basis of a pile foundation nonlinear theory; based on a similarity ratio vibration table model test, a second reinforcement effect corresponding to each candidate reinforcement scheme is determined; the reinforcement rate corresponding to each candidate reinforcement scheme is determined; and a target reinforcement scheme is determined according to the first reinforcement effect, the second reinforcement effect and the reinforcement rate. According to the method, the internal force and deformation characteristics of the existing pile group under various candidate reinforcement schemes are rapidly analyzed by adopting a nonlinear theory, and a similarity ratio model test is made for analysis and verification, so that the mechanical properties of the existing pile group are accurately and effectively analyzed; and pile foundation nonlinear theoretical calculation, similarity ratio vibration table model test and the reinforcement rate are comprehensively considered, and finally a target reinforcement scheme is 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

Images