Shaking table model test and numerical analysis of the bedding rock slopes under frequent micro-seismic actions
LIU Shulin1，2，3，YANG Zhongping1，2，3，LIU Xinrong1，2，3，LIU Yongquan1，2，3，HU Yuanxin4，WU Zusong5
(1. Key Laboratory of New Technology for Construction of Cities in Mountain Area，Ministry of Education，Chongqing University，Chongqing 400045，China；2. School of Civil Engineering，Chongqing University，Chongqing 400045，China；3. National Joint Engineering Research Center for Prevention and Control of Environmental Geological Hazards in the TGR Area，Chongqing University，Chongqing 400045，China；4. Headquarters of Chongqing Yuwu Airport，Chongqing 401120，China；5. International College，Chongqing Jiaotong University，Chongqing 400074，China)
Abstract：The dynamic response，variation of stability coefficient，deformation process and failure modes of two kinds of bedding rock slopes with different dip angles under frequent microseisms were investigated with the shaking table test and discrete element method UDEC. Under frequent microseisms，the natural frequencies show a downward trend，whereas the damping ratios present an upward trend. The structural damage of the slope keeps developing and accumulating and is manifested as the initiation，propagation and penetration of the bedding planes and secondary joints. The permanent deformation of the slope increases gradually and the stability coefficient decreases. The acceleration responses of two kinds of slopes show the “elevation effect”and“aspect effect”，and the dynamic response decreases with the increase of the loading time of microseisms. For the gently dipped bedding slope being loaded with strong earthquakes at the later stage of the shaking table test，the failure of the slope presents the layer-by-layer cracking and shedding from the top to the bottom，but the damages under the frequent microseisms simulated by UDEC are mainly concentrated on the slope surface. For the steeply dipped bedding slope with non-exposed layer parallel to the slope surface，the stability of the slope under microseisms is generally good. The failure surface under strong earthquake is mainly composed of three parts：a steep edge section of the trailing edge，an undulating section of the middle step and a gentle shear section of the leading edge.
刘树林1，2，3，杨忠平1，2，3，刘新荣1，2，3，刘永权1，2，3，胡元鑫4，吴祖松5. 频发微小地震作用下顺层岩质边坡的振动台模型试验与数值分析[J]. 岩石力学与工程学报, 2018, 37(10): 2264-2276.
LIU Shulin1，2，3，YANG Zhongping1，2，3，LIU Xinrong1，2，3，LIU Yongquan1，2，3，HU Yuanxin4，WU Zusong5. Shaking table model test and numerical analysis of the bedding rock slopes under frequent micro-seismic actions. , 2018, 37(10): 2264-2276.
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2018, Vol. 37 
