摘要
土工格室加筋土挡墙因其结构轻巧、稳定性高而具有广阔的工程应用前景,均匀长加筋面板式格室挡墙性能尤为良好,但目前相关的试验研究尚少。以拟建的长加筋面板式土工格室挡墙为对象,开展了竖向分级静载作用下的室内模型试验,对挡墙的变形、墙内竖向应力以及格室加筋层应变进行了测试和分析,探讨了均匀长格室层的加筋作用机制。结果表明:竖向荷载作用下,挡墙上部填土沿水平方向产生了中间大、墙面处小的不均匀沉降,埋于其中的格室加筋层因受弯而产生“网兜”效应,合并格室较强的侧限作用,致使部分竖向应力转化为格室的水平应力,多层格室的水平向转化作用使得挡墙底部的竖向应力明显减小,沉降沿水平方向亦趋于均匀分布。挡墙上部的翘起变形使得加筋层对墙面产生向下的拉力,故墙面竖向位移随荷载的增加而迅速增长;且对墙面产生向内收缩的作用,有效限制了上部墙面的水平位移,0.375H~0.75H(H为总墙高)范围内格室墙面水平位移较大,最大值出现在0.375H高处。加筋层应变沿水平方向的分布形式受填筑高度和荷载的影响较小,竖向荷载作用下均匀长加筋面板式格室挡墙的潜在破裂面的剖面线形为距墙踵一定距离的竖向缓变曲线。该成果可为此类土工格室加筋土挡墙的实践应用提供有价值的设计、施工参考。
For the advantages of light weight and high stability,the geocell-reinforced soil retaining walls will be widely used in the retaining construction in the near future.The performance of the facing-type geocell retaining wall reinforced by extending geocell layers with uniform spaces over the full height of the wall(FE-type),is better than other types of geocell retaining structures.However,the experimental researches on the FE-type geocell retaining walls are limited at present.The model test in this study was performed on an FE-type geocell retaining wall to examine the mechanical characteristics in terms of deformations and vertical stresses of the retaining wall under vertical static load.The strains of the extended geocell layers were examined and the effect mechanism was also discussed.Results show that the differential settlements of upper fillers of the retaining wall present as larger in the middle than that approaching the face-plate.The tuck net effect of the geocell layers inside the upper fillers owing to bending,and the strong lateral restriction of the geocell layers have transformed parts of vertical forces into the horizontal forces exerting on the geocell layer.Through the transformations of several geocell layers,the vertical stresses significantly decrease and the differential settlements almost disappear at the bottom of the retaining wall.Due to the warping deformation,the upper geocell layers exert downward tensions and inward contractions on the upper face-plates of the retaining wall.Consequently,the vertical displacements of the face-plates increase rapidly with increasing loads.And it also effectively limits the increasing of the horizontal displacements of the face-plate.The horizontal displacements of the face-plates ranging from 0.375H to 0.75H(where H is the height of the retaining wall)are larger than other parts,and the maximum displacement locates at the 0.375H height.The influences of the back filling height and loads on the distribution of the geocell layers strains along the ho
作者
屈畅姿
李梦竹
刘泽
魏丽敏
周详详
曹峥
QU Chang-zi;LI Meng-zhu;LIU Ze;WEI Li-min;ZHOU Xiang-xiang;CAO Zheng(College of Civil Engineering,Xiangtan University,Xiangtan,Hunan 411105,China;School of Civil Engineering,Hunan University of Science and Technology,Xiangtan,Hunan 411201,China;School of Civil Engineering,Central South University,Changsha,Hunan 410075,China)
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2023年第12期3424-3434,共11页
Rock and Soil Mechanics
基金
湖南省教育厅优秀青年科学研究项目(No.22B0146)
国家自然科学基金(No.51508489,No.51878671)。
关键词
加筋土挡墙
土工格室
模型试验
变形
格室应变
reinforced-soil retaining wall
geocell
model test
deformation
strain of geocell layer
