浇筑层数对重力坝仿真结果影响研究

Influence of layered pouring on simulation results of gravity dam

混凝土重力坝的结构形式决定其主要依靠自重产生的抗滑力来满足稳定要求,同时依靠自重抵消由静水压力引起的拉应力以满足强度要求,因此工程的数值仿真结果与计算时自重荷载的施加方式直接相关.本文采用有限元法对某重力坝工程进行数值仿真,系统分析了不同分层浇筑情况对坝体应力与位移结果的影响.研究结果表明,分层浇筑的施工过程将极大程度的影响自重荷载的加载路径和结构整体的变化趋势,浇筑分层越细,实际沉降分布规律越趋近连续,坝体的竖直向变形随分层数量的增加而降低,但变形幅度的影响随浇筑层数增加而降低;同时坝体最大拉应力均随浇筑层数的增加而增大,且近乎成线性变化,这意味着不考虑分层浇筑的仿真结果将无法真实反映坝体的变形破坏情况.

The structural form of the concrete gravity dam determines that it mainly relies on the anti-sliding force generated by its own weight to meet the stability requirements,while relying on its own weight to offset the tensile stress caused by the hydrostatic pressure to meet the strength requirements,so the numerical simulation results of the project and the application of the self-weight load during calculation.The way is directly related.This paper uses the finite element method to simulate a gravity dam project,and systematically analyzes the effects of different layered pouring conditions on the stress and displacement of the dam.The research results show that the construction process of layered pouring will greatly affect the loading path of self-weight load and the overall change trend of the structure.The finer the pouring layer,the closer the actual settlement distribution law to continuous,and the vertical deformation of the dam.It decreases with the increase of the number of layers,but the influence of the deformation amplitude decreases with the increase of the number of pouring layers;at the same time,the maximum tensile stress of the dam body increases with the increase of the number of pouring layers,and it changes almost linearly,which means that it is not considered.The simulation results of layered pouring will not truly reflect the deformation and failure of the dam.