基于Hewlett土拱模型桩承式加筋路堤桩土应力比计算  

CALCULATION FOR PILE-SOIL STRESS RATIO OF GEOSYNTHETIC-REINFORCED PILE-SUPPORTED EMBANKMENT BASED ON HEWLETT SOIL ARCHING MODEL

作　　者：齐天宇 耿敏 李培勇 QI Tianyu;GENG Min;LI Peiyong(School of Civil Engineering,Dalian Jiaotong University,Liaoning Dalian116000,China)

机构地区：[1]大连交通大学土木工程学院,辽宁大连116000

出　　处：《低温建筑技术》2021年第2期104-107,共4页Low Temperature Architecture Technology

基　　金：辽宁省自然科学基金指导计划(20180550293);辽宁省科技厅自然基金指导计划(2019-ZD-0116)。

摘　　要：桩土应力比是桩承式加筋路堤荷载传递以及地基沉降计算的重要参数。基于Hewlett土拱模型,单独分析拱顶或拱脚土单元,假设拱顶土单元处于极限状态(拱脚土单元处于弹塑性状态),以均匀超载模拟交通荷载,推导桩土应力比计算公式;基于抛物线模型,考虑筋-土界面摩擦以及地基反力,改进张拉膜效应分析方法,推导加筋条件下桩土应力比计算公式。最后与相关文献实测数据进行对比验证,结果表明该方法与相关文献实测结果除桩间净距为100mm存在误差外,变化规律基本一致,当桩间净距大于100mm时,误差不超过8%。The pile soil-stress ratio is an important parameter for load transfer and foundation settlement calculation of geosynthetic-reinforced pile-supported embankment.Firstly,based on Hewlett soil arching model,the arch crown and arch foot soil element separately were analyzed;The calculation formula of pile-soil stress ratio was deduced,assuming limit state of soil element at arching crown(elastoplastic state of soil element at arching foot)with uniform overload to simulate embankment load.Then,the analysis method of tensioned membrane effect was improved by considering the skin friction of geosynthetic-soil and ground reaction based on parabolic model,and the calculation formula of Pile-soil stress ratio that under geosynthetic-reinforced was deduced.Finally,the presented formula was verified with laboratory model tests data.The results show that the presented formula has good agreement with measured data except for the clear spacing between piles is 100mm.Moreover,the error narrows down within 8%when the clear spacing greater than 100mm.

关 键 词：桩承式加筋路堤 桩土应力比 土拱效应 张拉膜效应 

分 类 号：TU470.3[建筑科学—结构工程]