基于原型监测的青铜峡大坝工作性态分析

Analysis on Working State of Qingtongxia Dam Based on Prototype Monitoring

青铜峡大坝经过几十年的长期运行,诸多影响因素和边界条件都发生了较大变化,对于大坝结构性态有必要进行重新评估。在青铜峡大坝原型监测资料整编的基础上,综合阐述了大坝的内外部变形、坝基扬压力、应力应变及温度等物理量的分布情况和变化规律,针对某些重要物理量的变化原因进行了分析判断。结果表明:除了河西下导墙结构缝存在一定横河向错动趋势外,大坝结构总体工作性态正常,防渗体系功效良好,但仍需关注西导墙变形和薄弱基岩坝段的扬压力变化情况。

After several decades of the long-term operation, many influence factors and boundary conditions have been changed in Qingtongxia dam.Therefore, it is necessary to reassess the characters of the dam structure.On the basis of the prototype monitoring data of Qingtongxia Dam, the distribution and variation rules were clarified in detail about the important values in the dam, such as the inner and outer displacement, upper pressure, stress-strain and temperature.The variation reasons of some important physical values were analyzed. According to the analysis results, the working state and safety situation of the dam are normal and the seepage prevention system is working well, but the structure joints of guide wall in the west river have the tendency of displacement along the transverse river.Therefore, displacement of west guide wall and seepage of the dam under weak ground shall be focused.