南京地层地铁隧道施工的Peck公式修正

The correction of Peck formula in subway tunnel under Nanjing stratum

通过南京地区施工得到大量地表沉降实测数据,研究地铁隧道施工引起地表沉降问题,运用线性回归结合最小二乘法数学方法,引入两个修正系数:沉降槽宽度修正系数β、地表最大沉降修正系数α,对Peck公式两个重要参数———沉降槽宽度系数K、底层土体损失率η进行修正,使之适用于南京地质条件下研究区间涉及的工况。结果表明:地表最大沉降修正值α介于0.5-0.9,沉降槽宽度β介于0.6-1,此时沉降槽宽度系数K介于0.35-0.75,土体损失率η介于0.4%-0.85%,得到修正后Peck曲线与地表实测沉降数据更吻合。

Based on a large number of surface subsidence measured date through the construction the Nanjing area, surface subsidence problems of subway tunnel construction were researched. By using of linear regression and least square method and introducing two correction factor including β which is the correction coefficient of the settlement groove width and a which is maximum surface subsidence correction factor, the important parameters of Peck formula as follow K which is the width of the set-tlement trough coefficient - and ηwhich is the loss rate of the underlying solid amendment were corrected. The results were expected to be applicable to the conditions of the Nanjing institute of geology under the conditions of study interval. The results show that when α is 0.5 - 0.9, and/3 is 0.6 - 1, then K is 0.35 - 0.75, η is 0.4% - 0.85%. Peck formula corrected fits well with the actual test date.