摘要
根据小湾水电站拱坝虚设结构诱导缝的实际工程要求,采用三维有限元和子模型方法分析研究坝踵处的应力、应变和变形特征,分析研究了设缝对拱坝整体结构的影响。研究结果表明,设缝后拱坝整体刚度略有降低,但对拱坝整体安全性影响很小;诱导缝位于拉应力区,可以起到释放拉应力的作用,可改善坝踵应力状态,综合考虑施工因素,设缝是合适的;蓄水后诱导缝处于张开状态,须确保止水可靠,以防水力劈裂;缝端廊道周边存在拉应力,局部己超过混凝土的抗拉强度,应加强配筋以限制裂缝开展;设缝高程处坝体有效截面减小,抗剪能力略有降低,但不致出现剪切破坏。本文可为优化设计方案提供参考。
The 3-D FEM is combined with sub-model method to analyze the stress, strain and deformation in the vicinity of dam heel and study the effect of induced joint on the whole structure of dam. It is found that the rigidity of dam is slightly weakened but the safety of dam will not be affected. The induced joint is located in the tensile region of the dam playing the role of releasing the tensile and improving the stress state of dam heel. It is pointed out that the water sealing of the induced joint must be guaranteed since it will be in opened state after impounding of the reservoir and the reinforcement must be enforced to control the development of cracking.
出处
《水利学报》
EI
CSCD
北大核心
2006年第1期97-103,共7页
Journal of Hydraulic Engineering
