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边坡稳定分析的颗粒流方法研究

DOI: 10.3969/j.issn.1006-7043.201403021

Keywords: 边坡失稳, 颗粒流(PFC), 数值模拟, 宏观参数, 细观参数

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Abstract:

传统的边坡稳定性分析采用刚塑性模型, 事先假定滑动面, 按极限平衡状态进行计算。滑移面的准确确定及参数选取对计算结果影响很大, 此外土是一种散体材料, 按采用连续性假设的弹性力学理论分析, 在理论上矛盾。针对这一问题, 采用颗粒流理论, 给出了颗粒流模拟方法, 首先对粘土试样的双轴试验进行了数值模拟, 并结合摩尔-库仑破坏准则, 得到细观参数对宏观特性的影响规律, 然后模拟演示了粘性土坡在自重作用下变形破坏的全过程。模拟过程符合滑坡发生、发展、滑动的过程。说明了颗粒流方法模拟边坡变形破坏力学行为的可行性和优越性。

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