论文部分内容阅读
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。
According to the actual engineering requirements of the induced structure of the arch dam of the Xiaowan Hydropower Station, the stress, strain and deformation characteristics of the dam heel were analyzed and analyzed by using the 3D finite element method and the sub-model method. The influence of the joint design on the overall structure of the arch dam was analyzed. The results show that the overall stiffness of the arch dam decreases slightly after the joint is established, but has little effect on the overall safety of the arch dam. The induced fracture is located in the tensile stress zone, which can release the tensile stress and improve the stress state of the dam heel. Considering the construction factors, it is appropriate to set the joint. After the water is stored, the induced joint is in the open state, and the water stoppage should be ensured reliably to prevent the hydraulic splitting. There is tensile stress around the seam end corridor, The reinforcement should be strengthened to limit the crack initiation. The effective cross-section of the dam at the seam elevation is reduced and the shear capacity is slightly reduced, but the shear failure will not occur. This article can provide a reference for optimizing the design.