顶管施工的地表沉降数值分析和顶力计算

Numerical Analysis of Surface Settlement and Calculation of Jacking Force for Pipe-jacking Construction

闽江北水南调(平潭引水)工程管道施工将采用非开挖顶管法施工,穿越地层主要有淤泥质土层、中砂层及中风化凝灰熔岩。顶管顶力计算得到了4个顶进段的顶力预测值。根据已有的工作成果,将顶管施工对周围土体产生的扰动情况进行了分析总结。通过模拟顶管地表沉降并分析规律,将模拟结果与Peck公式计算结果进行对比,验证了所建模型得到的地层沉降的基本趋势,分析了不同横断面沉降幅度变化的可能原因,为该工程施工提供了设计参考。

Trenchless pipe jacking technology is proposed to be used in the pipeline construction of Minjiang River North to South Water Diversion Project(Pingtan Water Diversion Project),and the strata mainly includes silt soil layer,middle sand layer and middle weathering lava.The predicted values of jacking force of four jacking sections are obtained by calculation.Based on the previous results,the perturbation of the surrounding soil is investigated.By simulating the surface settlement of pipe jacking and analyzing the patterns,the simulation results are compared with the calculation results from the Peck formula,the basic trend of ground settlement obtained by the established model is verified.And the possible reasons for the change of settlement amplitude of different cross sections are discussed,which provides preliminary supports for the engineering construction design.