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对于砂土和粉土,应力指数j的值取0.5左右,当参考应力σr = 100 kPa时,地基土的总沉降量等于各分层沉降量的总和,可以通过以下方程计算得出:
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