考虑地震历时影响的岩质边坡楔体稳定性分析与计算

Analysis and computation of Sliding Wedge in Rockmass Considered Influence of Earthguake Historical Time

本文根据Newmark在强震荷栽作用下计算土坎坎肩永久位移的概念,结合传统的刚体极限平衡分析法,计算了在地震历时作用下岩体边坡楔体的安全系数和永久位移,为岩体边坡动静稳定性评价提供了一条新的途径。在不考虑地震加速度垂向分量影响的假定条件下,本文提出了临界加速度,由此可根据加速度时程曲线评价边坡楔体的稳定性,迅速可靠,可避免繁琐的动力分析计算。作者用编制的计算程序计算了一工程实例。

Newmark's concept of computmg the permanent displacements under seismic loads has been combined with the conventional limit equalibrium analysis to compute the factor of safety and the permanent dioplacements of rock wedge, which can provide a tool for evalu- ating the stability of rockmass slope under seismic and static loads. The critical acceleration based on the assumption that the vertical acceleration can be negelected, as presented in this paper, serves for an engineer to get the first hand informatiom about the stability of the rockmass for a given acceleration-time-history without going into the details or dynamic analysis. Author evaluated an engineering case using the program slope compiled.