考虑结构面震动劣化的岩质边坡动力稳定分析

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摘要通过试验获取结构面震动劣化效应的数学表达式，并将之运用于岩质边坡的动力稳定性分析中。采用3DEC作为计算引擎，在每一动力计算时步内根据动力响应值实时刷新结构面的强度参数，同时由网格净节点力的矢量计算获取该时刻作用于边坡岩体上的地震惯性力。根据极限平衡理论计算该瞬时岩质边坡的稳定性系数，通过动态计算获取整个地震历时过程的稳定性系数时程曲线，以最小平均安全系数作为最终动力稳定性评价指标，从而提出一种考虑结构面震动劣化的岩质边坡动力稳定性计算方法。将该方法运用于汶川地震区岩质边坡实例研究中，稳定性分析结果与实际地质调查情况相符，验证该方法的可行性和工程实用性。

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关键词 ：边坡工程, 岩质边坡, 震动劣化, 地震荷载, 动力稳定性, 离散单元

Abstract：Mathematical expression of vibration deterioration effect of structural plane is obtained by experiments；and then the expression is applied to rock slope?s dynamic stability analysis. 3DEC is selected as calculation engine，and at each dynamic calculation step，mechanical parameters of structural plane are refreshed according to the real-time values of dynamic response；meanwhile，the earthquake inertial force at that moment is obtained via net vectorial nodal force?s vector calculating. Hence the rock slope?s instantaneous safety factor is obtained based on the limit equilibrium theory. Therefore，the time series of factor of safety can be got for whole earthquake process by dynamic calculating；and the dynamic stability evaluation index is determined by minimum average safety factor method. Consequently a new method for analyzing dynamic stability of rock slope is presented，which takes vibration deterioration of structural plane into account. Finally，the method is used to study a rock slope case in Wenchuan earthquake-affected region；and the analytical results matched actual geological survey situation well，so as to testify the feasibility and correctness of the proposed method.

Key words： slope engineering rock slope vibration deterioration seismic loading dynamic stability distinct element

收稿日期: 2012-07-18

引用本文:

倪卫达1，唐辉明1，2，刘晓2，吴益平1. 考虑结构面震动劣化的岩质边坡动力稳定分析[J]. 岩石力学与工程学报, 2013, 32(3): 492-500.
NI Weida1，TANG Huiming1，2，LIU Xiao2，WU Yiping1. DYNAMIC STABILITY ANALYSIS OF ROCK SLOPE CONSIDERING VIBRATION DETERIORATION OF STRUCTURAL PLANES UNDER SEISMIC LOADING. , 2013, 32(3): 492-500.

链接本文:

http://www.rockmech.org/CN/Y2013/V32/I3/492

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