沈阳砂土地层含翼缘钢顶管摩阻力计算方法

Calculation Method of Frictional Force Along Flanged Steel Jacking Pipe in Shenyang Sandy Strata

基于Staheli的圆形顶管拱顶竖向土压力计算方法,推导出含翼缘异形钢顶管的拱顶竖向土压力计算方法.通过室内改进的直剪试验,得到了钢顶管与沈阳砂土、砂浆混合液与存泥浆之间的摩擦系数.通过现场监测,得到了含翼缘异形钢顶管顶力、摩阻力随顶程的变化规律.综合以上拱顶竖向土压力的理论推导与管土摩擦系数的室内试验,提出了含翼缘异形钢顶管摩阻力理论计算方法,将该方法的计算结果和现场观测数据进行了对比,得到较好的一致性,验证了所提方法的可行性.

Based on the Staheli's method for calculating the vertical soil pressure on circular jacking pipes,a vertical earth pressure calculation model for the circular flanged jacking pipe in Shenyang sandy strata was derived.The mechanical parameters of the sandy strata were tested,and the friction coefficients between soil and pipe was measured using a m odified direct-shear test.The changing rules of the jacking forces and the frictional forces during the jacking process were monitored in situ.Then,a new calculation method was proposed to estimate the frictional resistance of the flanged jacking pipe in the sandy strata of Shenyang.Results from the proposed method agree w ell w ith field monitoring data,which proves the feasibility of the proposed method.