钢顶管竖向土压力计算方法对比

Comparison of Vertical Soil Pressure Calculation Methods for Steel Pipe Jacking

钢顶管作为非开挖施工的常见施工方法,其竖向土压力计算是钢管强度和刚度设计的关键。首先对常见的三种卸荷拱理论计算方法进行介绍,其后结合实际顶管工程勘察资料,以砂性土和黏性土两种常见土层为例,以传统计算方法和三种卸荷拱理论方法为准则,对影响计算结果的关键因素进行梳理,进行了等效土柱高度和竖向土压力对比分析,最后总结了钢顶管竖向土压力计算时的设计要点。

The steel pipe jacking is a common construction method in the trenchless construction.Its vertical soil pressure calculation is a key in the strength and rigidity design of steel pipe.Firstly three common unloading arch theoretical calculation methods are introduced.Then combined with the practical pipe jacking survey information,taking two common soil layers of sandy soil and cohesive soil as an example,using the traditional calculation method and three unloading arch theoretical methods as the criterion,the key factors influencing the calculation result are sorted out,and the equivalent earth-pillar height and the vertical soil pressure are compared and analyzed.Finally,the design essentials in the calculation of vertical soil pressure of steel pipe jacking are summarized.