返包式土工格栅加筋路堤现场试验与数值分析  

Field Test and Numerical Analysis of embankment Reinforced by Geogrid

作　　者：刘泽[1] 严文钦 刘欢 李洪 黄振华 易清曦 LIU Ze;Yan Wenqing;LIU Huan;LI Hong;HUANG Zhenhua;YI Qingxi(School of Civil Engineering,Hunan University of Science and Technology,Xiangtan,411201,China)

机构地区：[1]湖南科技大学土木工程学院,湖南湘潭411201

出　　处：《防灾减灾工程学报》2021年第5期1105-1112,共8页Journal of Disaster Prevention and Mitigation Engineering

基　　金：浙江省交通科技项目(202004);浙江省建筑技术创新项目(2020B50,2020B51)资助。

摘　　要：结合一座土工格栅加筋路堤的建造施工,埋设土压力盒、柔性位移计等元器件,测试了路堤在施工过程中竖向土压力、水平土压力、土工格栅拉应变的分布规律,并在此基础上开展了加筋路堤的数值分析,研究了加筋路堤的变形与潜面滑裂面形态。结果表明:(1)土工格栅加筋路堤内竖向土压力随路堤填高的增加而增大,在沿土工格栅布设方向上竖向土压力呈"单峰"状分布,峰值出现在土工格栅中部附近;(2)坡面生态袋后水平土压力较小,且受路堤边坡侧向变形的影响明显,加筋体后的水平土压力随填土高度增加近似线性增大;(3)路堤内各层土工格栅主加筋部分的拉应变在布筋方向上也为"单峰"状分布,峰值一般都出现在距坡面3.5 m处;(4)坡面返包部分筋材的拉应变主要产生于上部相邻两层填土施工期间;(5)加筋路堤的潜在破裂面可简化为0.35H的折线型。Combined with the construction of a geogrid reinforced embankment,earth pressure cells and flexible displacement meters were embedded.The distribution of vertical earth pressure,horizontal earth pressure,and tension strain of geogrid during embankment construction were measured.Based on this test,a numerical model of the reinforced embankment was established,and the deformation and morphology of the potential slip surface of the reinforced embankment were studied.The results show that:(1)the vertical earth pressure in the geogrid-reinforced embankment increases with the increase of embankment filling height,and the vertical earth pressure along the direction of geogrid layout presents a"single peak"distribution;the peak value appears near the middle of geogrid;(2)the horizontal earth pressure behind the ecological bag on the slope surface was smaller,and is obviously affected by the lateral deformation of the embankment slope;the horizontal earth pressure after reinforcement increases approximately linearly with the increase of fill height;(3)the tension strain of the main reinforcement part of the geogrid in each layer of embankment also demonstrates a"single peak"shape in the direction of reinforcement distribution,and the peak value usually occurs at 3.5 m away from the slope surface;(4)the tension strain of the backpack part of the reinforcement mainly occurs during the construction of two adjacent layers of the upper fill;(5)the potential fracture surface of the reinforced embankment can be simplified to a 0.35 H crease line type.

关 键 词：土工格栅加筋路堤 现场试验 数值分析 

分 类 号：TU471[建筑科学—结构工程]