小湾水电站大型尾水调压室结构三维有限元数值分析  

3D Finite Element Numerical Analysis of Large Tailrace Surge Chamber in Xiaowan Hydropower Station

作　　者：叶超[1] 杨亚玲[1] 

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072

出　　处：《水力发电》2009年第4期44-47,共4页Water Power

基　　金：国家自然科学基金重点资助项目(90715042);国家科技支撑计划(2008BAB29B01)

摘　　要：针对小湾水电站大型复杂尾水调压井洞室及衬砌结构,采用三维非线性有限元方法,对洞室开挖围岩稳定性和衬砌结构受力特性进行了计算分析。通过对衬砌按线弹性和非线性开裂两种计算方案进行比较,分析了空间多岔调压井衬砌结构在不同工况下的应力分布及变形、开裂特性,从而为结构安全评价及配筋提供合理建议。计算结果表明:洞室开挖整体稳定性较好,局部需加强支护;运行期的阻抗板孔口以及板与井壁连接处和检修期的岔管底角受力较大,应作为结构配筋的重点,并采取相应的加固措施以保证安全。According to the chamber and lining structure of the large and complex tailwater surge shaft of Xiaowan Hydropower Station, the excavation stability of underground caverns and stress characteristics of lining structure are analyzed by three-dimensional nonlinear FEM. By comparison of two calculation conditions of linear and nonlinear cracks of lining structure, we analyzed the stress distribution, distortion and cracking characteristics of multi-fork surgeshaft lining structure under different operation conditions, and then also provided some reasonable suggestions for the structure safety evaluation and reinforcement design. The results showed that the excavation stability of whole chamber is good, but some supports should be reinforced locally. The orifice of impedance board during operation period and the base angle of bifurcated tunnels during overhaul period where suffers more stress in the lining structure, should be focused on in the reinforcement design, and corresponding measures must be taken to ensure its safety.

关 键 词：尾水调压室 混凝土衬砌 有限元法 结构分析 小湾水电站 

分 类 号：TV642.4[水利工程—水利水电工程] U451.4[建筑科学—桥梁与隧道工程]