格宾材料在红砂岩填料中的拉拔试验研究  

Study on Pull-out Test of Gabion Reinforcement Filled with Red Sandstone

作　　者：黄向京[1] 方薇[1] 林宇亮[1] 杨果林[1] 

机构地区：[1]中南大学土木建筑学院,湖南长沙410075

出　　处：《公路交通科技》2009年第9期26-31,共6页Journal of Highway and Transportation Research and Development

基　　金：湖南省科技厅资助项目(06ck3030);湖南省交通厅资助项目(200612)

摘　　要：以湖南湘潭至衡阳高速公路西线加筋格宾挡墙为工程依托,通过大尺寸的拉拔试验,研究了钢丝直径分别为2.2 mm和2.7 mm的2种双绞合六边形金属格宾网与红砂岩的界面摩擦特性。试验改进了筋材的夹持方法,有效地限制了试件的横向变形和在拉拔过程中的颈缩效应。此外,利用Flac3D对本次试验进行了数值模拟。结果表明,2种格宾网的拉拔位移-剪应力曲线变化趋势大致相同;双绞合六边形格宾网的拉拔系数比土工膜和土工格栅要大,并且它们的抗拉强度高、延伸率低;数值模拟中,拉拔试验各项指标与模型试验差距甚微,相对误差均小于4.6%,提高了研究的可信度。Based on the project of reinforced gabion wall in west line of Xiangtan-Hengyang expressway in Hunan province, large scale pull-out tests on the interface friction characteristics between double twisted hexagonal gabion mesh （2.2 mm and 2.7 mm respectively） and red sandstone were carried out. In order to reduce the necking effect of gabion mesh and lateral deformation during pull-out test, special clamping system was developed.Additionally, numerical simulation was operated by using Flac3D. The result shows that （1） displacement-shear stress curves of these two kinds of gabion mesh are almost the same; （2） drawing coefficient of double twisted hexagonal gabion mesh is larger than that of geo-membrane and geogrid, gabion mesh also possesses high tensile strength and low elongation; （3） all indexes of pull-out model test are very close to that of numerical simulation with relative error below 4.6%, which enhanced the reliability of the study.

关 键 词：道路工程 格宾网 拉拔试验 数值模拟 界面摩擦特性 

分 类 号：U417.11[交通运输工程—道路与铁道工程] TU411.93[建筑科学—岩土工程]