运用Peck公式对某顶管工程地面沉降的预测探讨

Discuss on Prediction of Ground Subsidence in a Pipe-jacking Engineering by Peck Formula

基于广州市某分洪道顶管工程实测所得的地面沉降数据，探讨Peck公式在预测顶管施工引起地面沉降中的适用性，并借助函数拟合的方法，修正理论Peck公式下沉降曲线与实测沉降曲线的偏差。引入地表最大沉降修正系数“及沉降槽宽度修正系数卢，通过推算和验证，当α和β分别介于0．229—0．809，0．176—0．324时，可利用修正Peck公式预测该地区下顶管施工引发地面沉降的大小。

On the basis of the ground settlement data measured in the pipe-jacking of floodway works in Guangzhou, the applicability of Peck formula in predicting ground subsidence caused by pipe-jacking was discussed, and then by means of function fitting, the deviation between the subsidence curve got by Peck formula and by measurement, was corrected. Thus, maximum surface subsidence correction coefficient α and settlement trough width correction coefficient β were introduced. Through calculation and verification, it is concluded that, when the α is between 0. 229 and 0. 809 and β between 0. 176 and 0. 324, the corrected Peck formula may be used to predict the ground subsidence caused by pipe-jacking in this region.