新疆某高混凝土面板堆石坝流变反演分析

Rheological Inversion Analysis of a High Concrete Face Rockfill Dam in Xinjiang

该工程坝内部变形和表面变形在同类型级工程中偏大,且尚未收敛,现场检查发现坝顶和坝后出现了混凝土结构破坏等现象。为择机修复坝体防渗结构,对坝体内部测点和表面测点观测值的相对沉降值进行反演分析,通过反演分析确定"南水"双屈服面弹塑性模型和流变模型的参数。并基于反演分析结果,预测体沉降变形程度及最终沉降时间,计算成果表明:目前坝体沉降约占总沉降的83%,后期尚有17%的变量,估计坝体最大变形量为2.07 m。为后期修复坝体防渗结构提供依据。

There is a dam in Xinjiang which facing problems of large and ever increasing internal and surface deformation.Field investigation was first carried out to analyze the concrete structure damage occurred at the dam crest and behind the dam.In order to repair the seepage control structure of the dam,the relative settlement values of the observation points inside and on the surface of the dam are used for inversion analysis,and the parameters of the elasto-plastic model and rheological model of"nanshui"double yield surface are determined by inversion analysis.The degree of settlement deformation and the final settlement time are predicted.The calculation results show that the dam settlement accounts for 83%of the total settlement at present,and there are still 17%variables in the later stage.The maximum deformation of the dam is estimated to be 207.3 m.The results could provide a basis for the later restoration of the dam seepage control structure.