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目前,有关重力坝深浅层抗滑稳定问题的研究主要集中在分析方法和失稳判据上,而对于荷载作用下坝基岩体与软弱结构面不断弱化,进而导致大坝失稳的过程则鲜有成果。本文基于损伤力学的相关理论,考虑岩体材料的非均匀性,建立了坝基岩体损伤破坏的数值分析模型。以三峡大坝左岸3号非溢流坝段为研究对象,动态模拟了其坝基岩体的损伤破坏过程,给出损伤区的发展和不同损伤程度的分布,并对其整体稳定性进行了安全分析。计算结果与室内模型试验的结果相当接近,证明了本文建立的损伤数值模型的可靠性,表明本模型可以用于岩体破坏机理的研究和抗滑稳定安全性分析。
At present, the research on the anti-sliding stability of the deep and shallow layers of gravity dam mainly focuses on the analysis method and the instability criterion. However, the weakening of the dam body and the weak structure surface under the action of loads continuously weakens the process of dam instability Achievements. Based on the related theories of damage mechanics and taking into account the inhomogeneity of rock mass materials, a numerical analysis model of dam damage of dam foundation is established. Taking the non-overflow dam section No.3 on the left bank of the Three Gorges Dam as the research object, the damage and failure process of the rock mass of the dam foundation is simulated dynamically. The development of damage zone and the distribution of different damage degree are given, and the overall stability of the dam is ensured analysis. The calculated results are quite close to those of the indoor model test. The reliability of the numerical model established in this paper is proved, which shows that this model can be used to study the failure mechanism of rock mass and analyze the stability of anti-sliding stability.