Aseismic performance evaluation of reinforced earth retaining wall based on IDA
ZHU Hongwei1, XIANG Qin1, LAI Jun2
1. School of Environment and Resources, Southwest Science and Technology University, Mianyang 621010, China;
2. MOE Key Laboratory of High-speed Railway Engineering, Southwest Jiaotong University, Chengdu 610031, China
Abstract：The retaining structure located in high seismic intensity area is always facing the severe test of catastrophic earthquake. So far, no one has done systematic study on the vulnerability of reinforced earth retaining wall at home and abroad. Here, the incremental dynamic analysis (IDA) method was adopted, considering the uncertainty of seismic input, the peak ground acceleration (PGA) was selected as seismic intensity parameter, and the displacement index of reinforced earth retaining wall was selected as performance parameter. Based on shaking table model tests and analyzing seismic damage data, the aseismic performance level of a reinforced earth retaining wall was divided, and its seismic vulnerability was analyzed by using the software ABAQUS. The results showed that the displacement index of retaining wall increases with increase in PGA, and its local deformation is its main failure mode under earthquake action; under medium earthquake action, retaining wall is mainly damaged and its damage degree is further aggravated after large earthquake action; when earthquake intensity increases continuously, the probability of serious damage and destruction can further increase; the failure probability of retaining wall can be reduced by increasing length of reinforcement and reducing geogrid laying spacing.
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