STUDY ON CRACKING AND STABILITY PROBLEMS OF HIGH ARCH DAMS ON COMPLICATED FOUNDATIONS
复杂地基上高拱坝开裂与稳定研究

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.