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50年代初期,我国一些工程曾采用过混凝土心墙堆石坝,但后来用得不多,特别是比较高的刚性心墙堆石坝,在国内外都少采用。究其原因,主要是担心刚性心墙在水压力作用下可能会因拉应力过大而产生裂缝。然而龙羊峡围堰工程的实践经验和原型观测结果却表明:该坝工作状态良好,混凝土心墙工作可靠,心墙断面基本上处于受压状态。因此,有必要弄清这种刚性心墙堆石坝的工作性状。本文采用考虑联合作用的非线性有限元方法,根据实际的工程情况(设计剖面、施工过程和质量)及原型观测结果,进行反馈分析,以确定有关计算参数,并对心墙的受力特性进行了分析。
In the early 1950s, some projects in our country had used concrete core rockfill dam, but later used less, especially the relatively rigid rigid core rockfill dam, which are rarely used at home and abroad. The reason is mainly worried about the rigid heart wall under water pressure may be due to excessive tensile stress and cracks. However, the practical experience and prototype observation results of Longyangxia cofferdam project show that the dam is in good working condition, the core of the concrete core works reliably, and the heart-wall cross-section is basically under compression. Therefore, it is necessary to understand the working properties of this rigid core rockfill dam. In this paper, the nonlinear finite element method considering the combined effect is used to conduct feedback analysis according to the actual engineering conditions (design profile, construction process and quality) and prototype observation results to determine the relevant calculation parameters and to conduct the stress characteristics of the core wall Analysis.