丰满大坝重建工程新坝坝基开挖和混凝土浇筑对老坝的影响分析

Analysis on the influence of foundation excavation and concrete pouring on the old dam of Fengman dam reconstruction project

丰满重建工程建设期间,老坝兼作为新建工程的上游围堰使用,老坝仍需正常挡水运行。新坝建设期间不可避免地对老坝的运行状态产生一定影响,为正确评价新建工程对原坝的影响,保证新坝建设期老坝运行安全,文中对新老坝相互影响进行了分析,确定新坝建设期对老坝的影响因素和影响程度,为采取相应的工程对策提供理论支撑。采用有限元法进行数值仿真计算,对老坝典型坝段的变形、应力以及抗滑稳定三方面进行定量分析。研究结果表明:新坝坝基开挖和混凝土浇筑对老坝的工作性态基本没有影响,对抗滑稳定亦无不利影响。

During the construction of fengman reconstruction project, the old dam is also used as the upstream cofferdam of the new project. New dam construction inevitably produces a certain influence on the running state of the old dam, In order to correctly evaluate the influence of new construction on the original dam and ensure the operation safety of the old dam during the construction period of the new dam, this paper analyzes the mutual influence of the new and old dams, and determines the influencing factors and influence degree of the new dam during the construction period of the old dam, so as to provide theoretical support for the corresponding engineering countermeasures. The finite element method is used for numerical simulation, and the deformation, stress and anti-slip stability of the typical section of the old dam are quantitatively analyzed. The results show that the new dam foundation excavation and concrete pouring have no effect on the working performance of the old dam, and the anti-slip stability has no adverse effect.