基于离散元法的顺层岩质边坡的地震响应分析

基于离散元法,结合某水电站厂房后缘顺层岩质边坡工程,研究缓倾角多结构面岩质边坡的地震响应规律及锚杆的加固效果,提出了该边坡抗震加固优化方案。研究表明:未加固顺层块状岩质边坡在地震过程中位移呈现阶梯式增长,地震结束时刻边坡岩块松散崩落;加固后边坡位移显著减小,且能在地震作用下保持稳定;锚杆的剪力响应与其附近结构面的相对位移相关性强,表明锚杆附近岩层面间的相对位移是激发锚杆加固作用的主要因素,在坡面出露且出露点低的岩层面在地震作用下相对位移较大,对应的锚杆承受剪力也较大,据此可更合理地布置锚杆。

Analysis of seismic responses of bedding rock slope based on DEM

Using the DEM, based on the bedding rock slope project behind the powerhouse of a hydro-power plant, we studied the seismic responses and anchor reinforcement effect of a bedding stereoplasm rock slope with multiple structural planes, and proposed a seismic reinforcement scheme for the slope. The research showed that the displacement of the unreinforced bedding stereoplasm slope under seismic action showed a stepped increase, and the rock blocks fell apart at the end of the earthquake. After reinforcement, the displacement of the slope diminished significantly, and the slope could remain stable in the earthquake. The shear force response of the anchor elements showed strong correlation with the relative displacement of their nearby structural planes, which means that the relative displacement between the rock planes around the anchor was the main stimulation factor of the anchor reinforcement effect in the earthquake. The relative displacement of the rock planes exposed on the slope surface at a lower elevation was larger; thus, the shear force of the corresponding anchor was larger. On these grounds, we put forward a more reasonable scheme for anchor arrangement.