强震作用下混凝土重力坝破坏模式研究

Study on failure mode for concrete gravity dam under impact of strong earthquake

采用混凝土弥散性裂缝模型,运用非线性模型对国内某高混凝土重力坝进行破坏模式研究。通过地震超载法得到各类典型坝段最终破坏形态,并对典型坝段的裂缝演化进行了时间历程模拟,得到裂缝出现、发展至坝体破坏全过程。研究得出了不同类型坝段在极限地震荷载作用下的破坏规律,并对重力坝抗震关键部位和薄弱环节进行了总结,为实际工程中采取工程措施提供了参考。

With application of smeared crack model for concrete, the failure mode is studied with nonlinear model for a high concrete gravity dam in China. Through the method of seismic overload, the final failure modes of all the typical dam sections are obtained, and then the whole process from the crack appearance, development and failure of dam body is acquired from the time history simulation made on the crack evolution of the typical dam section. The study gives the failure laws of various types of the dam section under ultimate seismic load and summarizes the key locations and weak points for the earthquake-resistance of gravity dam; which provides some references for the engineering measures taken in the actual construction concerned.