摘要
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。
Currently, researches on the gravity dam deep and shallow anti-sliding stability mainly focus on the analysis method and instability criterion, while the studies on specifically test the breakage of gravity dams due to weakening foundation rock mass and structural planes under loading are rare. With damage me-chanics theory,a numerical model,considering the nonuniformity properties of rock materials,has been es-tablished to analyze the breakage process of dam foundation rock mass. Taking the No.3 non overflow dam section at left bank of the Three Gorges Dam as the research case,the damage process of the dam founda-tion was simulated dynamically. The development of damage zone and the distribution of different damage ex-tent were both presented, and the safety status of global stability was analyzed. The obtained results show that they are in consistent with model test results, indicating the reliability of the established damage mod-el, which can be used to analyze the breakage mechanism of rock mass and evaluated the safety of an-ti-sliding stability.
出处
《水利学报》
EI
CSCD
北大核心
2014年第1期1-9,共9页
Journal of Hydraulic Engineering
基金
国家自然科学基金资助项目(11132003
51079045)
江苏省研究生培养创新工程(CXZZ12_0227)
关键词
重力坝
抗滑稳定
损伤力学
岩体破坏
数值模拟
gravity dam
anti-sliding stability
damage mechanics
rock breakage
numerical simulation
