基于改进的Lee-Fenves模型的混凝土堆石坝抗塑性损伤数值分析研究

Seismic Analysis and Numerical Analysis of Concrete Rockfill Dam Based on Improved Lee-Fenves Model

本文结合原型观测试验,分析改进的Lee-Fenves模型在混凝土堆石坝的塑性损伤分析中的适用性。通过工程实例原型试验分析,应力比对混凝土堆石坝的弹性强度影响较大,应力比较大,混凝土应力荷载逐步增加,损伤位置上移。当混凝土钢体厚度从200mm增加到500mm时,抗震强度增加25%,损伤面积减少30%,在易损区域,应该增加混凝土钢体的厚度,降低塑性损伤。

The paper analyzes the applicability of improved Lee-Fenves model in the plastic damage research of concrete face rockfill dam, combined with prototype observation.Through analyzing the prototype test,it turns out that stress ratio has great impact on the elastic strength of the concrete face rockfill dam.The higher stress ratio ,the higher stress the concrete loads,and the damage location moves up.When the thickness of the concrete steel increases from 200mm to 500mm,the shock strength improves by 25% ,the damage area decreases by 30% .Therefore,in vunerable area,the concrete thickness should be improved to lower plastic damage