基于离散元技术的陡倾顺层岩质斜坡动力响应FFT特征研究

Study on Dynamic Response FFT Characteristics of Steeply Dipping Stratified Rock Slope Based on Discrete Element Technology

以汶川地震中失稳的干磨房滑坡为例,经充分分析工点的地质情况,结合FFT变换和3DEC离散元技术,提出一种新的陡倾斜坡动力失稳响应和失稳模式的识别方法。结果表明:在相同地震荷载作用下,陡倾顺层硬岩斜坡坡体中上部出现显著破坏面,坡脚无明显破坏;陡倾顺层软硬互层斜坡坡体中上部及坡脚均出现显著破坏面,破坏程度更严重;两类斜坡在同一水平高度处,由坡表向坡内一定范围内均出现显著破坏。研究成果有利于西南地区岩质斜坡失稳评价及机理分析。

Taking a dry mill landslide which is unstable in Wenchuan earthquake as an example,a new identifcation method for dynamic instability response and instability mode of steep slope was proposed by analyzing the geological conditions of the work point and combining FFT transform and 3DEC discrete element technique.The results show that signifcant failure surfaces appear in the upper and middle slope bodies of steeply dipping stratifed hard rock slope and there is no obvious damage in the foot of the slope under the same seismic load,there are signifcant failure surfaces in the upper,middle slope bodies and foot of steeply dipping stratifed soft and hard interbedded slopes,the degree of destruction is more serious,and the two types of slopes show significant damage from the slope surface to a certain extent within the slope at the same level.The research results are beneficial to the instability evaluation and mechanism analysis of rock slope in Southwest China.