基于超载法的碾压混凝土拱坝非线性有限元研究

Nonlinear finite element study of RCC arch dam based on overload method

针对上高县保丰水库碾压混凝土拱坝坝体开展非线性有限元研究,建立有限元网格模型,采用超载法研究坝体整体安全性;模拟坝体正常蓄水位时,应用非线性有限元方法分析坝体的应力变形状态;采取逐步增加库水容重的方法,进行逐步的非线性分析,通过对变形、屈服区随超载倍数增加演化过程的分析,确定超载安全系数,掌握坝体系统的安全储备能力。研究结果表明,该方法计算得到的坝体超载系数可满足安全要求,可为今后类似工程提供借鉴。

The nonlinear finite element study is implemented on a roller compacted concrete arch dam in Shanggao County Baofeng Reservoir.The finite element mesh model is established.The overall safety of the dam body is studied by the overload method.The nonlinear finite element method is used for analyzing the stress and deformation state of the dam body when the normal water level of the dam is simulated.The method of gradually increasing the reservoir water volume density is adopted to carry out the step-by-step nonlinear analysis.The overload safety factor is determined and the safety reserve capacity of the dam body system is mastered through the analysis of the evolution process of deformation and yield zone with the increase of overload multiple.The study results show that the dam overload coefficient calculated by the method can meet the safety requirement.It can be used as reference for similar projects in the future.