糯扎渡水电站大坝应力变形及抗水力劈裂特性研究

The Study on the Stress Deformation and Anti Hydraulic Fracturing Characteristics of the Dam of the Nuozhadu Hydropower Project

心墙堆石坝初次蓄水是事故高发期,特别是蓄水速度较快时,可能对坝体的应力变形安全造成一些不利影响,如后期变形增加且稳定延长,甚至引起心墙水力劈裂发生裂缝。为确保大坝安全,需对初次蓄水速度进行深入研究。本文依托糯扎渡电站高心墙堆石坝工程,从大坝的应力变形及心墙的抗水力劈裂特性等方面研究了初次蓄水时的大坝安全特性,并提出蓄水速度建议。

The initial impounding of a core wall rockfill dam ,especially the impounding that takes place at a relatively high rate ,is the time when accidents would frequently happen ,which would probably cause certain adverse effect on stress deformation safety of the dam body ,for instance later deformation will in-crease and extend steadily and will even cause cracks due to core wall hydraulic fracturing .It is necessary to make a deep study on the initial impounding rate in order to ensure the dam safety .This paper studied the dam safety features and put forward the proposal of impounding rate in terms of the dam stress deform-ation and core wall hydraulic fracturing characteristic based on the high core wall rockfill dam of the Nuozhadu hydropower project .