强度折减有限元法模拟边坡牵引式破坏过程

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摘要针对边坡牵引式破坏由下向上逐次滑动的特点，应用强度折减有限元法多轮次计算模拟边坡破坏过程。对模拟计算的方法，采用二分法确定每一轮的强度折减系数；用静力平衡条件将局部破坏区域的土体转化为坡面荷载；用折减系数按轮次逐次变小的控制标准判别是否为牵引式滑坡。以锦江水库左坝头边坡为工程实例，模拟结果与实际情况基本相符，说明此计算方法可行。

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关键词 ：数值模拟, 牵引式滑坡, 强度折减有限元法

Abstract：The retrogressive failure process of the slope，which has the characteristics of steps failing from slope toe towards slope crest，is simulated by several rounds of calculation in strength reduction finite element method (FEM). During simulation process，strength reduction factor is determined by dichotomy method for each calculation round. Weight of the locally failed soil is converted into slope surface load based on the static equilibrium assumption. The gradually becoming smaller reduction factor in the successive calculation rounds is adopted as the control criterion to determine whether it is a retrogressive landslide. Left abutment landslide of Jinjiang reservoir is taked as engineering example. The simulation results，which is basically in accordance with actual situations，prove that the simulation method is a feasible method.

Key words： numerical simulation retrogressive landslide strength reduction finite element method

收稿日期: 2010-05-12

引用本文:

蔡文1，曹洪2，罗彦3，骆冠勇2. 强度折减有限元法模拟边坡牵引式破坏过程[J]. 岩石力学与工程学报, 2011, 30(S2): 3529-3533.
CAI Wen1，CAO Hong2，LUO Yan3，LUO Guanyong2. SIMULATION OF RETROGRESSIVE LANDSLIDE FAILURE PROCESS BY STRENGTH REDUCTION FEM. , 2011, 30(S2): 3529-3533.

链接本文:

https://rockmech.whrsm.ac.cn/CN/Y2011/V30/IS2/3529

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