基于原型观测的黑河黏土心墙土石坝渗流场评价

Evaluation of Seepage Field of Heihe Clay Core Earth-rock Dam Based on Prototype Monitoring Data

准确获得大坝渗流场的演化规律是进行大坝渗透稳定性评价的关键。通过从渗压计压力水头、位势时空变化规律、心墙下游可能溢出点、心墙孔隙水压力等值线分布等方面分析了黑河黏土心墙土石坝全过程渗流场变化规律,利用相关模型与判别准则揭示了演化的控制要素,提出了黏土心墙土石坝渗流是否稳定判别方法,分析表明黑河大坝渗流演化控制要素明晰,渗流规律正常,大坝渗流趋于稳定。

Accurately obtaining the evolution law of dam seepage field is the key to the evaluation of dam seepage stability.The change rule of the seepage field in the whole process of the Heihe clay core earth-rock dam is analyzed through the perspectives of the pressure head of the piezometer,the temporal and spatial variation of the potential,the possible overflow point downstream of the core wall,and the distribution of the core wall pore water pressure contours,etc.,relevant models and evaluation criterion reveals the control factors of seepage field evolution,and a method for judging the stability of the seepage flow of the earth-rock dam is proposed.The analysis result shows that the control factors in Heihe dam seepage evolution are clear,the seepage rule is regular,and the dam seepage tends to be stable.