混合坝接头型式与抗震安全性分析

Structural patterns of junction of composite dam and aseismic safety

接头布置型式及其安全是混合坝研究的重点问题.基于三维非线性动力有限元方法,结合观音岩混合坝,对2种接头型式分别仿真模拟,进行有限元动力计算.在混凝土坝与土石坝接头不同材料接触面处采用Good-man接触单元来模拟接触面,并分别采用Ducan双曲线E-B模型和等效线性本构模型模拟土石坝的静、动力本构,详细分析了混合坝连接处各个接触面上的静动力反应,得出了2种接头型式的变形和应力分布状况在地震情况下的发展规律,并给出了混合坝接头部位抗震措施.

Junction structure pattern and its safety are the key study content in composite dam field. Based on the 3-D nonlinear FEM, two type of junction structure patterns are simulated for the dam of Guanyinyan Hydropower Station. Goodman elements are used to simulate the contact surface between concrete key wall and clay core. Duncan E-B model and equivalent linear model are chosen to consider the static and dynamic constitutive of soil respectively. By FEM static and dynamical calculation, the law of static and dynamic response on every contact surface is analyzed in each junction structure patterns; based on which the anti-earthquake measures are put forward.