考虑应力历史和应力水平影响的土体压缩模量计算方法

CALCULATION METHOD FOR OEDOMETRIC MODULUS OF SOIL WITH EFFECTS OF STRESS HISTORY AND STRESS LEVEL

为了考虑应力历史对地基沉降变形的影响,本文基于单对数函数,引入压缩曲线在单对数空间上曲率最小时所对应的竖向应力(简称特征应力),建立了能够描述正常固结黏土、超固结黏土和砂土的压缩线表达式。然后,基于该表达式提出完全侧限条件下的压缩模量计算式,并分析了特征应力和压缩指数对压缩模量的影响规律。最后,通过与室内试验结果和实际工程中地基变形进行对比,验证了本文所提方法的合理性。

This paper presents a united expression of the compression lines of normal compressed clay,overconsolidated clay and sand by introducing a special vertical stress in single logarithmic coordinates.And then,based on the new expression and the concept of compression modulus,we obtain a calculation method for the compressive modulus of soil.Evolutionary laws of compressive modulus are presented and analyzed with the special vertical stress and compression index changing,respectively.Finally,comparisons with the test results and foundation settlement in engineering case indicate the rationality of this calculation method.