摘要
采用一维弹塑性锚索单元及三维弹塑性锚杆单元与三维线弹性梁单元耦合的方法,模拟边坡工程中的锚杆框架、预应力锚索框架以及它们与加固岩体的相互作用,对西攀高速公路K132岩质高边坡加固进行了方案的评价比选。结果表明,与锚杆框架梁相似,无框架的锚杆加固方案能对坡体浅部位移及应力场有所改进,不同的是,锚杆框架能够显著限制坡体表面变形;预应力锚索框架体系中,锚索的布置及预应力设计值在较大范围内显著影响坡体内部的位移及应力场的分布。因此,预应力锚索框架梁方案是提高K132岩质高边坡稳定性的首选方法之一。
As two new kinds of compound reinforcement facilities, rockboh frame beam and anchor cable frame beam are widely used for reinforcement of rock slopes in recent years. However, past studies on the two facilities synthetically considering interactions among rockbolt （anchor cable）, frame beam and rock masses are quite few. Coupled with 1-D elastic-plastic cable elements and 3-D elastic-plastic rockbolt elements, 3-D linear-elastic beam elements were used to simulate the interactions between reinforcement and the reinforced rock slope. Influence of the reinforcement on the stability of one rock slope of Xichang-Panzhihua expressway at the mileage K132 was assessed on the basis of the simulation results. The results show that both rockbolt reinforcement methods with or without frame beam are helpful for the improvement of the stability of surface layer of the slope in terms of displacement and stress distribution. But, with frame beam, deformation on the slope surface is significantly reduced.Moreover, fields of the displacements and stresses in the slope are greatly related to the layout of the cables and the design magnitude of the prestress. Therefore, it is concluded that reinforcement of prestressed anchor cable coupled with frame beam is one of the most effective methods to improve the stability for the studied slope.
出处
《公路交通科技》
CAS
CSCD
北大核心
2008年第1期21-26,共6页
Journal of Highway and Transportation Research and Development
基金
交通部西部交通建设科技资助项目(200231800026)
四川省交通厅计划科研资助项目(99003)
关键词
道路工程
边坡加固
数值模拟
锚杆(索)框架梁
单元耦合
road engineering
reinforcement of slope
numerical simulation
rockbolt （ anchor cable） frame beam
element coupling
