土工格栅与尾矿拉拔试验及筋材拉力研究

Pull-out Test and Tensile of Geogrids and Tailings

为分析土工格栅与尾矿拉拔试验中拉力沿土工格栅的变化规律,通过试验中格栅所受到的拉力、剪应力和应变的关系,提出了影响筋-尾矿界面特性的拉力系数a,推导出拉力沿格栅的分布公式,通过试验所测的数据验证了公式的可行性。在加筋尾矿结构中,加筋材料拉拔位移不是很大时,采用该公式能够较好的预估筋材在不同位置的拉力,为土工格栅在加筋尾矿坝工程中的应用提供依据。

In order to analyzed the change law of tension along geogrid in the pull-out test of geogrid and tailings. Through the relationship between the tensile force,the shear stress and the strain of geogrid in the test. The tension coefficient a which affected the interface characteristics of geogrid and tailings was proposed. The distribution formula of tension along geogrid was derived,and the feasibility of the formula was verified by the measured data. In the reinforced tailings structure,when the pull-out displacement of reinforced material was not very large,this formula could be used to predicted tensile of geogrid in different positions. The results provided the basis for the application of geogrid in reinforced tailings dam.