周期荷载下软土残余变形的模型试验研究

A Model Test Investigation on the Residual Deformation of Soft Clay under Cyclic Loadings

为研究软土地基在周期荷载下的变形特性,研制和设计了一套周期荷载下模型试验装置。报道了8个模型试验成果,旨在探讨基土的含水量、静力固结荷载、周期加载方式及预剪间歇效应对基土变形特性的影响。推演并验证了周期荷载下残余变形的预测公式,根据试验成果导得了对残余变形发展起控制作用的临界周期荷载比。最后,对基土残余变形发展的机理作了探讨。

A set of model test apparatus for determining the dreformation characteristics of soft clay under cydlic loadings was developed. Eight model test results were presented in this paper with the aim to investigate the effects of water content of soft clay, static consolidation load, cyclic loading manners,preshearing and aging on the residual deformation behaviours of soft clay. Theoretical formulae to predict residual deformation were derived on the basis of test results and the accracy of the prediction formulae was examined by experimental results. A critical cyclic load ratio, which is a threshold between low and high deformation rate of soil, was estimated according to the available and predicted results. Finally, an investigation was made into the mechanism of residual deformation development of soft clay.