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拉拔试验能更好的反映加筋土结构中筋材的加筋行为,采用自制的拉拔试验装置来测试高填方路堤的现场砂粒填料与土工格室的界面特性参数,分析土工格室与土的界面摩擦作用,进一步研究土工格室的加筋机理。结合工程实例,对土工格室处治高填方路堤进行现场试验,分析格室在路堤横断面的受力特点以及格室的加筋性能。试验结果表明:土工格室拉拔受力是一个渐进式的过程,随着拉拔位移继续增大,格室后面几排网格依次受到填料的阻力,拉拔界面的剪应力呈台阶式的上升;格室与填料的界面摩擦角大于填料本身的摩擦角,且拉拔系数K大于1.0,格室加筋性能远优其他平面材料的加筋性能;在路堤横断面方向,格室承受拉应力;在新旧路堤搭接处,格室受拉应力最大,是重点需要处治的位置。研究表明格室能有效的约束路堤土的侧向变形,同时土工格室所在层位起到了扩散荷载的作用。
The pull-out test can better reflect the reinforcement behavior of the reinforcement material in the reinforced earth structure. The self-made drawing test equipment is used to test the interface characteristics of the sand filler and the geocell in the high embankment. The geocell and Soil interface friction, further study geogrid reinforcement mechanism. Combined with engineering examples, field tests were carried out on the high-embankment embankment treated by geocell. The stress characteristics of the geocell in the cross-section of the embankment and the reinforced performance of the geocell were analyzed. The experimental results show that the geocell pull-out force is a gradual process. As the dislocation displacement continues to increase, the grids behind several rows of grids are in turn subjected to the resistance of the packing, and the shear stress at the drawing interface is stepped The friction angle between the cell and the filler is larger than the friction angle of the filler itself, and the drawing coefficient K is greater than 1.0, the cell reinforcement performance is far superior to the reinforcing performance of other planar materials. In the direction of the cross-section of the embankment, Stress; in the old and new embankment lap at the grid cell tension stress is the largest, is the focus of the need for treatment position. The research shows that the cell can effectively restrain the lateral deformation of the embankment soils, and the geocell’s layer plays the role of diffusion load.