水利学报2012，Vol.43Issue(12)：1494-1499,1506,7.
带加强节点双向土工格栅的拉拔试验研究
Pull-out tests of biaxial geogrid with strengthening nodes
摘要
Abstract
In order to obtain a new reinforced material which has the effect of three-dimensional reinforcement, strengthening nodes are set up at the intersections of conventional biaxial geogrid. A series of pull-out tests of geogrid with strengthening nodes were carried out to study the interaction characteristics between strengthening nodes and the sand in the laboratory. The influences of rib spacing and strengthening node height on ultimate pull-out resistance were also discussed. The results show that pull-out resistance-displacement curve reaches the peak value when the normal stress is low, while it exhibits strain harden characteristic when the normal stress becomes high. The ultimate pull-out resistance of geogrid with strengthening nodes is larger than the conventional geogrid's. Moreover, it decreases as the rib spacing increases, whereas it rises with the increase of strengthening node height linearly. Based on the pull-out test results, the components of ultimate pull-out resistance were analyzed. It is found that the dominant force of ultimate pull-out resistance changes from bearing resistance of the transverse ribs to frictional resistance between ribs and the sand with the rib spacing increasing.关键词
立体加筋/带加强节点土工格栅/拉拔试验/界面特性/极限拉拔阻力Key words
three-dimensional reinforcement/geogrid with strengthening nodes/pull-out test/interfacecharacteristics/ultimate pull-out resistance分类
建筑与水利引用本文复制引用
李磊,张孟喜,周小凤,朱洪..带加强节点双向土工格栅的拉拔试验研究[J].水利学报,2012,43(12):1494-1499,1506,7.基金项目
国家自然科学基金资助项目 （）
上海市教育委员会科研创新项目 （）
