STUDY ON CRACKING AND STABILITY PROBLEMS OF HIGH ARCH DAMS ON COMPLICATED FOUNDATIONS
STUDY ON CRACKING AND STABILITY PROBLEMS OF HIGH ARCH DAMS ON COMPLICATED FOUNDATIONS
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发表时间：
2007
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通讯作者：
Zhou Weiyuan
中科院分区：
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作者：
Zhou Weiyuan
讨论了拱坝的稳定性及其开裂机理，涉及热力变化、地震引起的刚度减弱和渗流作用，分析了坝面和节理岩体开裂扩展的微观机制和宏观开裂屈服条件，提出了考虑坝体与岩体总刚度的拱坝力学破坏模型。 坝体与地基是大坝稳定性分析的关键环节，采用本文提出的数值模型，以复杂岩基溪洛渡拱坝为基础，分析了不同水压下坝体上下游面的开裂过程，以及坝地界面点安全性与水压力的关系。数值结果表明，所提出的数值模型和方法在水工设计中具有良好的适用性。
The stability of arch dams and their cracking mechanism have been discussed.They are concerned with thermal variation,rigidity weakening due to earthquake and seepage effects.Cracking and propagating micro-mechanism and marco-cracking yield condition in the dam surface and jointed rock mass are analyzed;then,a mechanical failure model for arch dams is proposed in account of total stiffness between dam body and rock foundation.It is shown that the fractures and rupture of dam and foundations are key process in analyzing stability of dams.By employing proposed numerical model,based on Xiluodu arch dam with complicated rock foundation,the dam cracking process in up-down stream surfaces under different water pressures,and the relation between point safety and water pressure in the interface between dam and foundation are analyzed.The numerical results show that the proposed numerical model and methods have good fitness in hydraulic design.