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在分析粘性土时,应力指数等于零。对于正常固结土,根据切线变形模量Et的定义,推导出计算粘性土地基总沉降量的方程:
其中:
σor,i
-
第i层地基土的平均初始竖向自重应力
σz,i
引起地基土压缩的竖向附加应力(例如上部结构超载引起的应力增量)
mi
第i层地基土的Janbu模量
hi
第i层地基土的厚度