摘要
由于土材料的实际性状非常复杂,并且随加载条件的不同而有很大变化。每一类型土的本构模型都有它特定的应用范围和局限性。1970年提出的邓肯-张(Duncan-Chang)模型是一种目前被广泛应用的非线性弹性模型,但在自然状态下,许多土的卸载-再加载性质是接近于线性和弹性的。为了反映土的这一特性,本文提出了在应用邓肯-张模型分析土体破坏时的若干关键技术供应用时参考。着重处理了不同于单调加载时的卸载-再加载变形模量和泊桑比,建议了判断土的卸载-再加载现象破坏准则。
The actual properties of soil are very complicated and vary greatly with loading condition.The constitutive model of every kind of soil has its own application field and limitation.Duncan-Chang model presented in 1970 is a kind of widely used non-linear elastic models.However,the soil properties of unloading-reloading under natural condition are close to linear and elastic.Some key techniques in applying Duncan-Chang model to analyze soil failure are conducted in this paper for reference.The deformation modulus and Poisson's ratio of unloading-reloading differing with those under monotonic loading are treated emphatically and failure criteria under unloading-reloading is suggested.
出处
《基建优化》
2007年第6期157-160,共4页
Optimization of Capital Construction
