基于Terzaghi方法的桩承式路堤中土拱效应算法改进

摘要

It is taken into consideration for analysis of soil arching effect in pile-supported embankments that the actual working equilibrium state of embankments is between active equilibrium state and rest equilibrium state. So that new formulas of pile-soil stress ratios and the height of the equal settlement plane in embankments are presented, with half of the sum of coefficient of lateral soil pressure and coefficient of active earth pressure as coefficient of static earth pressure. It is found that the theoretical value by improved formula of pile-soil stress ratio is extraordinary close to that of practical engineering, so it is manifested that the improved model of soil arching effect is reasonable.%在桩承式路堤土拱效应分析中,考虑路堤填土实际处在极限主动平衡状态与静止平衡状态之间的工作状态,基于对Terzaghi土拱效应模型的改进,得到了桩土应力比和等沉降面高度计算式,其中取静止土压力系数和主动土压力系数之和的一半作为模型中土体的侧向土压力系数.研究结果表明:改进的桩土应力比理论计算值总体上与实测值非常接近,说明了该模型具有一定的合理性.