Discrete Element Analysis of Huangtupo Landslide
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摘要: 根据黄土坡滑坡所处的深部地质和表层古滑坡体结构特征, 建立滑坡地质环境模型, 运用离散元数值模拟方法研究黄土坡滑坡与深部地质环境的关系, 明确了其形成机理, 认为软硬相间的岸坡地层及顺向坡特点构成了黄土坡滑坡形成的物质条件和发生背景环境, 其内在力学机制是深部软硬相间岩层在重力蠕滑作用下发生的拱张, 在考虑不同荷载组合的情况下预测评价滑坡的稳定性变化, 滑坡体上建筑荷载会抑制中部剪切滑移区的发展, 但能使滑坡体前端剪切滑移区扩大, 从而降低滑体前缘的稳定性.Abstract: Based on the deep geology and the geological structure characteristics of the ancient landslide body, a geo environmental model of Huangtupo landslide in the reservoir of Three Gorges is established to quantitatively analyze the mechanism of the sliding in terms of discrete element method. It is concluded that inter bedding structure of soft and hard formation consists of the main geological background, which induced the arching of the formation under gravity. Stability analysis by considering different loadings shows that ground building load in the middle can restrain the development of shear sliding zone in the middle, but may extend the shear sliding zone at the foot area which will reduce the safety of the front.
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图 2 模型1自重作用下的应力场及剪切滑移区
Fig. 2. Stress field and shear sliding zone by gravity for model 1
图 3 模型2自重作用下的剪切滑移区及自重与建筑荷载作用下的应力场
Fig. 3. Shear sliding zone by gravity and stress field by gravity and building load for model 2
表 1 黄土坡滑坡离散单元计算参数
Table 1. Mechanical properties for discrete element calculation
表 2 离散元计算方案
Table 2. Calculation designs of discrete element method
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[1] 吴永丰. 黄土坡滑坡及其主要问题[A]. 见: 崔政权, 邓清禄. 岩土工程论文集[C]. 武汉: 中国地质大学出版社, 1999.WU Y F. Huangtupo landslide and its main problems[A]. In: CUI Z Q, DENG Q L, eds. The proceeding of geotechnique[C]. Wuhan: China University of Geosciences Press, 1999. [2] 王泳嘉, 邢纪波. 离散单元法及其在岩土力学中的应用[M]. 沈阳: 东北工学院出版社, 1992.WANG Y J, XING J B. Principle of discrete element method and its application to geo-mechanics[M]. Shenyang: Northeast Poly-technology Institute Press, 1992. [3] 周维垣. 高等岩石力学[M]. 北京: 水力电力出版社, 1993.ZHOU W Y. Advanced rock mechanics[M]. Beijing: Hydra-electrical Publishing House, 1993. -
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