基于广州地铁隧道施工的Peck公式修正

Modification of Peck formula based on construction of Guangzhou metro tunnel

为研究广州地铁21号线地区盾构隧道施工引起的地表沉降问题,文中基于广州地铁21号线工程地区地质情况和工程实际监测地表沉降数据,运用线性回归分析方法对实测地表沉降数据进行拟合,并和Peck公式进行对比分析.但由于Peck公式局限于工程地质条件,因此通过引入最大地表沉降修正系数α和沉降槽宽度修正系数β代入Peck公式进行修正改进,使修正后的Peck公式适用于广州地铁21号线研究区段的地表沉降预测.研究结果表明:α的数值范围为0.125~0.416,β的数值范围为0.555~0.717;修正后的Peck公式预曲线和原始Peck公式曲线相比,精度大幅提高,与实测数据曲线更接近.

In order to study the ground subsidence caused by shield tunnel construction in Guangzhou Metro Line 21 area,based on the geological conditions in Guangzhou Metro Line 21 area and the monitoring data of ground subsidence,this paper used linear regression analysis method to fit the measured ground subsidence data,and made a comparative analysis with Peck formula.However,limited to engineering geological conditions,Peck formula was modified by introducing the maximum surface subsidence correction coefficientαand the settlement trough width correction coefficientβ,so that the revised formula can be applied to the prediction of surface subsidence in the study section of Guangzhou Metro Line 21.The results showed that the value ofαranged from 0.125 to 0.416,and that ofβranged from 0.555 to 0.717.Compared with the original Peck formula curve,the precision of the modified Peck formula curve was greatly improved,and it was closer to the measured data curve.