重力坝均质坝基的失稳机理研究

A Research on Failure Mechanism for the Homogeneous Foundation of Gravity Dams

本文通过数值模拟重力坝均质坝基的破坏过程,对其失稳机理进行了分析研究。结果表明,坝基的破坏主要表现为坝踵裂缝的延伸和坝趾附近基岩剪切屈服区的扩展。当屈服区在坝基浅层形成上下游贯通时,坝基承载能力达到极限值,大坝沿塑性屈服层滑移,从而导致整体失稳。

An investigation into the topic of this paper is made by numerical simulation for the failure process of homogeneous foundation of gravity dams. The results show that the failure of dam foundation is caused mainly by the extension of dam heel crack and the expansion of shear-yield zone of the foundation rock near the dam toe. When the yield zone links up the up-and-downstream in the shallow foundation, the bearing capacity of the dam foundation reaches the limit value and the dam slides along the plastic yield layer, thus leading to the failure of the dam body.