节理化岩质边坡随机结构面有限元和离散元耦合计算方法研究

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摘要针对节理化岩质边坡节理面发育的特点，在连续–非连续离散单元法的基础上，自主编程实现随机结构面网格的有限元和离散元耦合计算模型。与有限元计算对比：弹性阶段计算结果基本一致，验证弹性阶段计算的有效性。与极限平衡法对比：在假定滑面各点同时达到承载极限的条件下，通过滑面平均应力得到与极限平衡法相差甚微的安全系数，再次验证应力计算的有效性，同时证明极限平衡法对应的是坡体的平均应力状态；由于计算模拟的是边坡破坏演化过程，在不采用极限平衡原理的条件下，即使是极限平衡判断稳定的边坡，也可能得到发生渐进破坏导致失稳的计算结果。模拟分析2001年发生的武隆滑坡，得到的结果与实际滑坡演化过程相吻合。坡体渐进破坏的计算结果表明，坡体内部裂缝的发生、发展与滑坡演化密切相关，模拟跟踪重点边坡内部破坏演化过程，有助于提前采取及时、适当的支护等措施，避免灾难的发生。

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关键词 ：边坡工程；节理化岩质边坡；随机结构面；渐进破坏；有限元离散元耦合；连续&ndash, 非连续离散单元法；武隆滑坡

Abstract：According to the joint distributing character of jointed rock slope，a numerical method of combined distinct element method/finite element method(DEM/FEM) for stochastic structural plane is presented based on continuum-discontinuum element method(CDEM). Compared with the elastic results of FEM，the method is indicated to be credible. Assuming all the points on the potential sliding surface are in the critical failure status simultaneously，there is almost no difference between the value of safety factor calculated by the method and limit equilibrium method(LEM)，which proves stress result of the method is credible once again. And it is also concluded that LEM shows the mean stress state，while the method aims to simulate the progress failure of slope. The slope may become instable caused by progressive failure which is concluded to be stable by LEM when the method is used without hypothesis of LEM. Wulong landslide is simulated and the consistent phenomenon with the real failure progress is got. The failure progress of the Wulong landslide shows that the development of cracks inside the slope is very important to analyse the stability of slope. Tracking and analyzing the failure progress of important slopes are helpful in taking proper supporting measures in advance to avoid disasters.

Key words： slope engineering jointed rock slope stochastic structural plane progressive failure combined distinct element method/finite element method(DEM/FEM) continuum-discontinuum element method(CDEM) Wulong landslide

收稿日期: 2012-01-09

引用本文:

刘天苹，李世海，刘晓宇. 节理化岩质边坡随机结构面有限元和离散元耦合计算方法研究[J]. 岩石力学与工程学报, 2014, 33(sl): 3114-3122.
LIU Tianping，LI Shihai，LIU Xiaoyu. STUDY OF DEM AND FEM COMBINATION METHOD FOR STOCHASTIC STRUCTURAL PLANE IN JOINTED ROCK SLOPE. , 2014, 33(sl): 3114-3122.

链接本文:

http://www.rockmech.org/CN/Y2014/V33/Isl/3114

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