组合式面板双绞合六边形钢丝网加筋土挡墙现场试验研究

Study of a combined panel earth retaining wall reinforced with double twisted hexagonal wire mesh by using site test

为研究双绞合六边形钢丝网加筋土挡墙的受力、变形特性,对潭衡(湘潭-衡阳)西线高速公路K124+340断面组合式面板双绞合六边形钢丝网加筋土挡墙进行了现场试验,测试了竖向土压力、水平土压力、筋材拉应变分布规律和格宾箱变形规律。结果表明:在筋材长度方向上,竖向土压力在挡墙下部呈双峰型分布,而在上部呈单峰形分布;墙背水平土压力沿墙高呈非线性分布,最大值发生在墙高约1.5 m处,实测水平土压力小于主动压力;筋材应变在筋长方向上呈非线性分布,各层筋材的应变分布模式不相同;筋材的变形主要发生在施工期,格宾箱的变形呈鼓胀式。

In order to study the structural characteristics of earth retaining wall reinforced with double twisted hexagonal steel wire mesh,a field experiment is conducted on a composite panel earth retaining wall reinforced with which on the site of K124＋340 of Xiangtan-Hengyang West Line Expressway,its vertical earth pressure,horizontal earth pressure,tensile strain distribution of geosynthetics and gabion deformation law are tested.The results show that： along the length of the reinforcement,the distribution of vertical earth pressure is bimodal-shaped distribution in the lower part of the retaining wall while a single peak-shaped distribution in the upper part;the horizontal earth pressure along the wall is nonlinear distribution,the tested maximum occurs at the height about 1.5 m and it is less than active earth pressure;the tensile strain of reinforcement distributed in a nonlinear form along the length;and different layers have a different forms,the deformation of reinforcement takes place in the construction period mainly;the deformation of gabion showed a bulging form.