基于H&R土拱模型的桩承式加筋路堤分析

Analysis of geosynthetic-reinforced pile-supported embankment based on H&R soil arching model

在H&R土拱模型的基础上,通过引入拱顶或桩顶土单元状态系数,对土拱效应分析方法进行了改进.改进的分析方法不仅考虑拱顶或桩顶土单元的弹塑性状态,而且满足路堤荷载平衡条件,同时也考虑了路堤顶面超载的影响.通过计入筋-土界面摩擦作用,改进了张拉膜效应分析方法,推导了桩承式加筋路堤荷载传递效率计算方法.最后采用现有文献中模型试验及数值模拟结果与所提计算方法进行了对比验证,结果表明:该方法计算结果与实测及数值模拟数据均较为符合,可为工程实践提供理论参考.

Firstly,the analysis method of soil arching effect was improved based on H&R soil arching model by introducing the state parameter of soil element at arching crown or pile head and the surcharge load acting on embankment crest.The improved analysis method of soil arching effect not only considered the elastoplastic state of soil element at arching crown or pile head,but also ensured the equilibrium condition of embankment load.Then,the analysis method of tensioned membrane effect was improved by considering the skin friction of geosynthetic-soil,and the calculation method of pile efficacy of GRPS embankment was deduced.Finally,the presented method was verified with laboratory model tests data and numerical simulation results of the publication to investigate its validity.Results show that analytical solutions have good agreement with measured data and simulation results,and the presented method can provide theoretical guidance for engineering practice.