减沉疏桩支撑路堤结构中路基填土抗力分析  

Analysis of the Embankment Fills Resistance in Scattered Piles-supported Embankment

作　　者：孙凯 杨宾川 马驰原 张浩[1] SUN Kai;YANG Binchuan;MA Chiyuan;ZHANG Hao(School of Civil Engineering,Zhengzhou University,Zhengzhou,He'nan 450001,China;Central- South Airport Construction Company,Hengyang,Hu'nan 421001,China;Zhengzhou Civil Defense Engineering Management and Maintenance Center,Zhengzhou,He'nan 450000,China)

机构地区：[1]郑州大学土木工程学院,河南郑州450001 [2]中南航空港建设公司,湖南衡阳421001 [3]郑州市人防工程管理维护中心,河南郑州450000

出　　处：《水利与建筑工程学报》2019年第2期151-155,161,共6页Journal of Water Resources and Architectural Engineering

基　　金：国家自然科学基金项目(51608490);河南省博士后科研资助项目(2015014);河南省高等学校重点科研项目(16A560009)

摘　　要：为研究减沉疏桩支撑路堤结构中填土抗力与疏桩刺入稳定问题,将桩体向上对路堤填土的作用看作倒置的浅基础对地基的作用,分别采用Vesic极限承载力理论和Meyerhof-Hanna冲剪破坏理论,建立极限状态下均质路基与路基-垫层双层路堤结构的填土极限破坏抗力计算模型;同时,考虑正常工作状态下路基填土抗力的发挥,基于孔穴扩张理论建立了桩顶荷载反作用时路基填土局部塑性开展时的抗力分析模型。计算结果表明,填土力学性能(c、φ)的提高和基底灰土垫层或加筋碎石垫层的设置有利于其抗力的提高和路基的局部刺入稳定。In order to study the embankment fills resistance and local stability in scattered piles-supported embankment caused by the pile penetration,the effect of the pile upward on the embankment is regarded as the effect of inverted shallow foundation on soils.Based on the Vesic theory of the ultimate bearing capacity and Meyerhof-Hanna punching failure theory,the calculation models of ultimate resistance of homogeneous fills and fills-cushion double layer embankment structure are established.Furthermore,a calculation method for local plastic development of embankment fills under the pile top load reaction is established by using pore expansion theory,in considering of the performance of embankment resistance under normal working state.Example analysis shows that the improvement of mechanical properties(c,φ)and the setting of lime-soil cushion or reinforced gravel cushion are conducive to the improvement of embankment resistance and local stability.

关 键 词：疏桩路堤 孔穴扩张 整体破坏 局部稳定 

分 类 号：TU473[建筑科学—结构工程]