隧道钢拱架支护的失稳破坏分析与对策

针对隧道支护使用钢拱架存在的靠增加钢拱架数量提高支护系统承载力的做法,结合工程实例分析隧道支护中钢拱架失稳破坏的形式及原因——钢拱架因为侧向刚度低而发生弱轴平面内的扭曲失稳。指出采取增设钢拱架之间的适当连接,增加其相互约束,可提高钢拱架弱轴平面的抗弯刚度。这是隧道支护设计与施工中提高钢拱架支护系统承载能力的简单易行的有效方法。这样做有利于充分发挥钢拱架的承载能力,获得良好的工程经济效益。

Analysis of the stability loss and failure of H-shaped steel arch tunnel support and counter-measures

The high loess slope problem has become a bottleneck of the site construction of the coal in dustry in loess areas, its stability directly related to engineering construction security. Taking the site construction of a coal industry project as example, this paper puts forward the design conception in slope stability, including stability design conditions and contents. Besides, it explores the stability of land slide and checks calculation method. And finally it considers that the transfer coefficient method for cal culating of the stability of landslide is more safety. This paper mentions a comprehensive prevention and treatment scheme： graded excavation ＋ leniency platform ＋ slop protection ＋ drainage system, having rel atively strong popularization using value.