等效变形模量的非线性特征分析

在瞬时沉降或最终沉降计算中，都要用到土的变形模量Ｅ０，由于室内试验和原位测试方面存在的困难，过去对变形模量研究的报导有限。本文用载荷试验结果证明了变形模量具有非线性特征。在此基础上，通过北京地区三类土的原位平板载荷试验的压力－变形曲线的数学表达式及其特征值分析了等效变形模量Ｅ０，ｅｑ随压力的变化特征，并推导出相应的表达式。

Analysis of Nonlinear Behavior of Equivalent Deformation Modulus

Boussinesq′s elastic solution as well as the Schlecher′s coefficients were frequently used in estimating immediate settlements of buildings in different codes and manuals.Yegorov′s elastic solution has also been used in several domestic codes formulated recently,in which the deformation modules will be unavoidably employed.Because the difficulties in deriving the deformation modules E 0 from either laboratory or in situ tests,limited amount of data is reported in the literature .The nonliner behavior of equivalent deformation modules E 0eq derived from plate loading tests performed on three main types of soils in Beijing area was studied in this paper using the p-s curves and their characteristic values. Mathematical expressions for the equivalent deformation modules varying with pressure p were established.