沥青混凝土心墙抗水力劈裂可靠度分析

Reliability Analysis of Hydraulic Fracturing of Asphalt Concrete Core

沥青混凝土心墙抗水力劈裂是高心墙堆石坝的关键技术问题，其可靠度计算在国内尚属空白，本文提出了非线性有限元与响应面法、JC法相结合的可靠度分析方法，构建了沥青混凝土心墙抗水力劈裂的功能函数，以目前亚洲最高的沥青混凝土心墙堆石坝——冶勒为例，根据非线性有限元对各随机变量波动的计算结果，并应用JC法计算了其结构可靠度指标。结果表明，沥青混凝土心墙β值为5～7，总体水平满足规范要求，口低值区主要分布在沥青混凝土心墙中下部，其成果与传统方法计算出的安全系数以及沥青混凝土心墙温度监测分析结果一致，心墙无破坏。该方法计算效率高，实用性强，成果合理、可信，具有借鉴推广应用价值。

The ability of asphalt concrete core walls to resist hydraulic fracturing is a key technique for high central core rock-fill dams and the calculation of its reliability is not touched in China In this paper, a new reliability calculation method is put forward, which combines the non-linear finite element method, response surface method , and JC method, and it formed the reliability function. The method is applied to the analysis of the structure reliability of YELE dam in Sichuan province, which is the highest asphalt concrete core in Asia The reliability index is got by JC method according to result of fluctuating of random variables during non-linear finite element calculation. It shows that the value of β is between 5 and 7, which, generally, meets the normal standard. Most of the low value data areas of β lies in the lower sides of the darn. By comparing with the monitoring data and traditional calculation method of safety factors, it shows that the method can get good precision, high performance and practicability.