返包式土工格栅加筋土高挡墙现场试验研究  

Research on geogrid reinforced soil retaining wall with wrapped face by in-situ tests

作　　者：杨广庆[1] 吕鹏[1] 庞巍[1] 赵玉[1] 

机构地区：[1]石家庄铁道学院土木工程分院,石家庄050043

出　　处：《岩土力学》2008年第2期517-522,共6页Rock and Soil Mechanics

基　　金：河北省自然科学基金项目(No.E2006000393)

摘　　要：为了研究返包式土工格栅加筋土高挡墙结构的受力、变形状态,分析其作用机理,进行了包括加筋土墙体基底应力、墙背侧向土压力、拉筋拉力和墙面水平变形等内容的现场试验,研究了加筋土墙体基底垂直应力、不同层位的拉筋拉力沿筋长的分布规律,加筋土挡墙潜在的破裂面位置,墙背侧向土压力沿墙高的分布规律以及墙面水平变形规律。测试结果表明,加筋土挡墙基底垂直土压力沿土工格栅拉筋长度方向呈非线性分布,最大值发生在拉筋中部附近,向拉筋两端方向逐渐减少;实测墙背侧向土压力沿墙高呈非线性形式分布,其值小于主动土压力;上部墙体拉筋应变沿筋长呈单峰值分布,下部墙体拉筋应变沿筋长呈双峰值分布;上部墙体潜在破裂面形状与"0.3H法"接近,而下部墙体潜在的破裂面形状与朗肯主动土压力理论接近;施工期墙面最大水平变形位置在墙高的下部,竣工后墙面最大水平变形发生在墙顶处等结论。In order to research the behaviors of the geogrids reinforced soil retaining wall of wrapped face in the railway main line of China, the tests, including the basement pressure and lateral pressure of the reinforced soil wall, the tensile force of the reinforcement and the lateral deformation in-situ are done. The vertical basement pressure, the distribution of tensile force along reinforcement, the potential slide surface and the lateral earth pressure along height are analyzed. The basement vertical pressure of reinforced soil retaining wall is nonlinear along the reinforcement length, and the maximum value is at the middle of the reinforcement length, moreover the value reduce gradually at former and bottom. The testing lateral pressure of the reinforced soil wall is nonlinear along the height; and the value is less than the active lateral earth pressure. The distribution of tensile strain along reinforcement at the upper wall is single peak value; but the distribution of tensile strain along reinforcement at the lower wall is twin peak values. The potential fracture plane at upper wall is similar to ＂0.3H＂ method; but the potential fracture plane at lower wall is near to the active Rankine earth pressure theory. The position of the maxmium lateral displacement of the wall face during construction is at lower wall; moreover the position of the maxmium lateral displacement of the wall face after construction is at top of the wall.

关 键 词：返包式 土工格栅 加筋土挡墙 现场试验 

分 类 号：TU471[建筑科学—结构工程]