土工格栅加筋陡坡路堤的力学行为分析  

Analysis of mechanical behavior of geogrid-reinforcecd steep embankment

作　　者：郭铭倍 宋玲[1] 刘杰 段彦福 GUO Mingbei;SONG Ling;LIU Jie;DUAN Yanfu(College of Water and Architectural Engineering,Shihezi University,Shihezi,Xinjiang 832003,China;Xinjiang highway planning survey and design research institute,Urumqi,Xinjiang 830006,China)

机构地区：[1]石河子大学水利建筑工程学院,新疆石河子832003 [2]新疆维吾尔自治区交通规划勘察设计研究院,新疆乌鲁木齐830006

出　　处：《石河子大学学报（自然科学版）》2019年第6期708-713,共6页Journal of Shihezi University(Natural Science)

基　　金：国家自然科学基金(51669031);新疆维吾尔自治区交通厅科技(2013(19));安徽省自然科学基金(KJ2014A092)项目

摘　　要：为了给类似土工格栅加筋路堤的设计和施工提供参考依据,本文以S101线沙湾段公路加筋陡坡路堤工程为例,借助Midas GTS NX有限元软件实现土工格栅加筋陡坡路堤的建模,对其潜在滑裂面、水平位移和筋材受力进行力学行为分析,并结合现场监测数据分析路堤边坡的稳定性。结果表明:土工格栅加筋结构可以使路堤的潜在滑裂面变缓且向内部移动,有限元法较极限平衡法得出的路堤滑裂面位置更准确;土工格栅加筋可以有效限制路堤的水平位移,增强路堤的稳定性;路堤中部和下部区域成为筋材主要受力区,建议在设计中应优先采用上疏下密的布筋方式,且在采用等间距布筋时中部和下部应选用较高强度的土工格栅;筋材受力最大值为23 kN,与极限值相差较大,说明现行规范采用的折减系数较为保守。For providing reference for the design and construction of similar geogrid reinforced embankment,this articletakesthe reinforced soil steep slope embankment of Shawan section of S101 line as an example,the model of geogrid-reinforced steep slope embankment is realized by Midas GTS NX finite element software.The potential slip surface,horizontal displacement and stress of the reinforcement are analyzed,and the stability of the embankment slope is analyzed with the field monitoring data.The results show that the geogrid reinforced structure can make the potential slip crack surface of the embankment slow down and move inward,and the finite element method is more accurate than the limit equilibrium method to obtain the position of the slip crack surface of the embankment.Geogrid reinforcement can effectively limit the horizontal displacement of embankment and enhance the stability of embankment.The middle and lower area of embankment become the main stress area of geogrid.It is suggested that the middle and lower part of geogrid with higher strength should be selected when equidistant geogrids are laid.The maximum stress of the geogrid is 23 kN,which is quite different from the limit value,indicating that the reduction coefficient adopted by the current code is relatively conservative.

关 键 词：土工格栅 陡坡路堤 力学行为 格栅应变 

分 类 号：U416.12[交通运输工程—道路与铁道工程]