基于苏州地层盾构施工的Peck公式修正

Amendment of Peck Formula for Shield Construction in Suzhou Stratum

基于苏州地铁盾构施工的地表沉降实测数据,运用线性最小二乘法进行拟合,通过Peck公式的两个重要参数：沉降槽宽度系数与地层损失率,对Peck公式进行修正,使其适合苏州地区土层盾构施工的地表沉降预测。结果表明：针对苏州地层,在运用Peck公式预测盾构施工引起的地表沉降时,使沉降槽宽度系数在0.42~0.59之间,地层损失率在0.53%~0.85%之间,可以获得良好的曲线,且与原始的Peck公式相比,预测的结果与实际情况更吻合。

Based on the measured surface subsidence data of Suzhou Metro Shield construction,a corrected and improved Peck formula was developed by using of linear regression and least square method to optimze two important parameters of Peck formula named the settlement trough width coefficient and soil loss rate. Corrected Peck formula was expected to be applicable to predict surface subsidence in Suzhou stratum. The results showed that a more accurate prediction curve could be obtained when they were between 0. 4 2 ~ 0. 5 9,and between0. 53% ~ 0. 85% for Suzhou stratum. The predicted results agreed well with the measured data.