中文摘要：

采用随机介质理论,推导出双圆盾构隧道施工时正常工况和旋转工况下由于土体损失引起的土体沉降计算公式。算例分析表明：本文方法地面沉降预测结果与实测值比较吻合;旋转工况下双圆盾构隧道施工引起的土体沉降曲线呈不对称,最大沉降值出现在向下旋转一侧,能较好的解释实测地面沉降曲线不对称的原因。在相同土体损失率时,与正常工况相比,旋转工况产生的最大沉降量变小,但沉降槽宽度变大。两者引起的土体沉降沿深度变化规律也有区别。

英文摘要：

The formulae for calculating the soil settlement induced by double-O-tube shield tunneling under the normal and rotated construction conditions are derived by use of the stochastic medium theory.The case studies show that the predicted surface settlements are in good agreement with the observed ones.The soil subsidence curve induced by double-O-tube shield tunneling under rotated construction condition is asymmetric,the maximum value appears at the downward rotation side,and it can be explained well why the observed soil settlement curve is asymmetric.At the same rate of soil loss,the maximum settlement value induced under the rotated condition is smaller than that under the normal condition,but the settlement trough width is larger.The variation rules of soil settlement at different depths induced under normal and rotated conditions are also different.