天生桥面板堆石坝实测变形的三维反馈分析

3-D feedback analysis based on the observational deformation of concrete face rockfill dam in Tianshengqiao Project

本文根据天生桥面板堆石坝施工期及初次高水位蓄水后的实测变形资料 ,采用清华非线性解耦K G模型 ,进行大坝整体的三维有限元反馈分析 .分析结果与实测结果基本相符 .反馈分析结果给出了坝料实际的力学性质 (模型参数 ) ,揭示了分区分期填筑的高面板堆石坝的复杂变形性状 ;文中提出对高坝下游填筑料 (即IIIC区料 )的坚实性应有较高的要求 .特别要注意对坝体的施工临时剖面进行优化设计 ,以控制堆石体的差异变形、防止面板下垫层料出现裂缝及脱空等问题 .

According to the observed data both in the period of construction and in the process of first impounding,the feedback analysis of the CFRD dam in Tianshengqiao Project was carried out using 3\|D FEM incorporated with K\|G model.The result accords with the deformation measured in\|situ.The result also illustrates the mechanical properties of rockfill material and reveals the complicated characteristics of high CFRD having different areas of material and many construction stages.On this basis,the authors suggested that it is improtant to improve the compaction of the material in the downstream side of the dam,particularly to optimize its temporary sections during construction,so as to control the differential deformation and to prevent from occurrence of cracks in cushion and voids between the cushion and concrete face plate.