正常固结饱和地基土的总应力强度指标

STRENGTH INDEXES OF TOTAL STRESS OF NORMALLY-CONSOLIDATED AND SATURATED SOILS

地基极限承载力与土体稳定分析的总应力分析法需要用土的总应力强度指标。三种常规室内三轴试验的固结应力状态、剪切时的应力路径和排水条件与地基土原位受荷破坏时不尽相同。本文首先建立三种典型排水条件下模拟地基土实际受力的总应力强度指标理论式 ,分析了其变化规律 ;与常规三轴试验结果进行了比较 ;分析了固结不排水条件下的强度计算途径和对应的指标 ;最后建立了两种部分排水条件下的总应力强度指标的计算式 ,分析了它们随固结的变化。

In consideration of difference in consolidated stress,loading mode and drainage between ordinary lab triaxial tests and in situ situation,this papers presents expressions,which take in situ actual consolidated stress and loading mode into account,to calculate in situ strength indexes for total stress analysis.Based on the derived expressions,a comparison between in situ and lab tests are made, and the applicability of lab test results to in situ soils is discussed.Special attention has been paid to consolidated undrained,partly consolidated undrained and unconsolidated partly drained shears.