桩承式加筋路堤中土工格栅加筋效应的室内试验研究  

Experimental Study on the Effect of Geogrid Reinforcement in Pile-supported Embankment

作　　者：朱学敏 崔晓艳 ZHU Xuemin;CUI Xiaoyan(Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing 210098,China;School of civil engineering and transportation,Hohai University,Nanjing 210098,China)

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京210098 [2]河海大学土木与交通学院,江苏南京210098

出　　处：《河北工程大学学报（自然科学版）》2020年第1期35-40,共6页Journal of Hebei University of Engineering:Natural Science Edition

基　　金：国家自然科学基金优秀青年科学基金资助项目(51922029)。

摘　　要：基于室内模型槽试验,开展了考虑土工格栅的桩承式路堤变形和填土应力分布规律研究,重点研究了土工格栅抗拉强度和土工格栅层数对软土竖向位移、填土竖向应力分布和桩土应力比的影响。研究结果表明:软土竖向位移随土工格栅抗拉强度和土工格栅层数增加而减小;不同层数土工格栅作用下填土竖向应力随路堤高度的分布规律差异较大。综合考虑桩承式路堤软土变形和填土荷载向桩顶转移程度,了解研究工况下土工格栅的作用效果,可为现场路堤工程中如何选用合适土工格栅抗拉强度和层数提供依据。Based on the laboratory model test,the deformation of pile-supported embankment and the stress distribution of soil filling under the action of geogrid are studied. The effects of geogrid tensile strength and the number of layers of geogrid on the vertical displacement of soft soil,vertical stress distribution of soil filling and pile-soil stress ratio are emphatically studied. The results show that the vertical displacement of soft soil decreases with the increase of geogrid tensile strength and the number of geogrid layers. Under the action of different layers of geogrid,the vertical stress of fill soil varies greatly with the height of fill soil. Considering the soft soil deformation of pile-supported embankment and the transfer degree of filling load to the pile top comprehensively,the effect of geogrid under the study condition is understood,which can provide a basis for selecting suitable geogrid tensile strength and layers in embankment engineering.

关 键 词：土工格栅 桩承式路堤 室内试验 

分 类 号：TU751.4[建筑科学—建筑技术科学]