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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。
The total stress analysis method for the ultimate bearing capacity of foundation and soil stability analysis needs the total stress intensity index of soil. Three kinds of normal indoor three-axis test of the consolidation stress state, the shear stress path and drainage conditions and the foundation soil in situ load failure is not the same. In this paper, the theoretical formula of total stress intensity index of simulated subgrade soil under three kinds of typical drainage conditions is established, and its variation rule is analyzed. Compared with the conventional triaxial test results, the strength calculation under undrained condition is analyzed Ways and corresponding indicators. Finally, two formulas for calculating total stress intensity under partial drainage were established and their changes with consolidation were analyzed.