桩承式路堤中加筋褥垫层的工作性状  

Working performance of reinforced cushion in piled embankment

作　　者：庄妍 程欣婷[2] 肖衡林 刘奂孜[2] 周倍合 李嘉俊 ZHUANG Yan;CHENG Xin-ting;XIAO Heng-lin;LIU Huan-zi;ZHOU Bei-he;LI Jia-jun(School of Civil Engineering,Key Laboratory for RC and PRC Structures of Education Ministry,Southeast University,Nanjing 210096,China;Jiangsu Research Center for Geotechnical Engineering Technology,Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing 210098,China;School of Civil Engineering and Architecture,Hubei University of Technology,Wuhan 430068,China)

机构地区：[1]东南大学土木工程学院混凝土及预应力混凝土结构教育部重点实验室,江苏南京210096 [2]河海大学岩土力学与堤坝工程教育部重点实验室,江苏省岩土工程技术工程研究中心,江苏南京210098 [3]湖北工业大学土木工程与建筑学院,湖北武汉430068

出　　处：《浙江大学学报（工学版）》2018年第12期2279-2284,2305,共7页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(51478166);“青蓝工程”资助项目;中央高校基本科研业务费专项资金资助项目(3205008801);江苏省高校优势学科建设工程资助项目(1105007138);“111”计划资助项目(B13024).

摘　　要：建立桩承式加筋路堤三维有限元模型,对比分析多层土工格栅与单层土工格栅情况下软土表面沉降、软土表面竖向应力与加筋体应变的分布规律.研究发现:软土表面的沉降仅与土工格栅的总强度有关,而土工格栅的层数对软土表面的沉降影响不大;对比单层与三层加筋体模型结果可知,三层加筋体能更明显地减小作用在软土中心的竖向应力,从而使得两桩之间的竖向应力分布更加均匀.在土工格栅总强度相同的情况下,多层加筋体底层土工格栅的最大应变是单层加筋体的1.38～1.50倍.A three-dimensional finite element model of geosynthetic-reinforced piled embankment was established.The distribution law including the settlement of subsoil surface,the stress of subsoil surface and the strain of geogrid were analyzed by comparing the results of the embankment reinforced by single and multiple layers of geogrid.It is found that the settlement of subsoil surface obviously depends on the total stiffness of geogrid,while is slightly influenced by the number of geogrid layers.Compared with the results of the embankment reinforced by single layer geogrid,three layers geogrid can more obviously reduce the vertical stress acting on the center of subsoil,and therefore resulting in more uniformly distribution of the vertical stress between piles.It also can be observed that the maximum geogrid strain for the bottom layer geogrid is approximately 38%to 50%larger than that of the single layer geogrid under the condition that the total stiffness of geogrid is the same.

关 键 词：桩承式路堤 加筋褥垫层 有限元分析(FEA) 土工格栅应变 软土沉降 

分 类 号：TU470[建筑科学—结构工程]