特高拱坝基础破坏、加固与稳定关键问题研究-中国科学技术协会.doc

特高拱坝基础破坏、加固与稳定关键问题研究 林 鹏1，王仁坤2，康绳祖1，张海超1，周维垣1 (1. 清华大学 水沙科学与水利水电工程国家重点实验室，北京 100084；2. 中国水电工程顾问集团 成都勘测设计研究院，四川 成都 610072) 摘要：特高拱坝的坝基条件大都比较复杂，基础岩体的破坏、加固与稳定评价出现一些关键新问题：坝基岩体力学参数合理取值；坝踵、坝趾基础开裂机制；坝肩非典型软弱蚀变带的处理；贴角区灌浆时机选择；坝趾锚固力损失评价以及大坝–基础非线性稳定分析等。传统的分析方法和加固处理措施日益受到挑战。结合实际工程，就如上问题涉及的研究方法、处理措施进行抛砖引玉的讨论和分析。针对这些新问题，无论数值模拟还是物理试验，都应该采用细宏观尺度的转变方法，并作为非线性方法的理论基础，进一步完善发展，以更好地指导实际工程的优化设计和建设。 关键词：水利工程；特高拱坝；基础破坏；加固处理；稳定分析；岩体力学参数 中图分类号：TV 35 文献标识码：A 文章编号：1000–6915(2011)10–1945–14 KEY PROBLEMS OF FOUNDATION FAILURE，REINFORCEMENT AND STABILITY FOR SUPERHIGH ARCH DAMS LIN Peng1，WANG Renkun2，KANG Shengzu1，ZHANG Haichao1，ZHOU Weiyuan1 (1. State Key Laboratory of Hydroscience and Engineering，Tsinghua University，Beijing 100084，China；2. HydroChina Chengdu Engineering Corporation，Chengdu，Sichuan 610072，generally locate in complicated foundation. The failure，reinforcement and stability mechanism of foundation are facing with challenging original problems，such as：mechanical parameter and strength reasonable selection of jointed rocks；cracking problem in the heel and toe of dams；reinforcement measures for atypical faults and altered rock；grouting timing design for toe area of dam；nchorage force damage and nonlinear evaluation for integrity stability. In this paper，these key problems involved in the research methods，and measures to carry on the discussion and analysis based on practical engineering. The micro-macro transfer method is proposed for coupling nonlinear analysis method. By employing this method，numerical simulation and experimental investigation on foundation failure，reinforcement and stability evaluation of superhigh arch dam need to further carry out for servicing dam design and construction. Key words：hydraulic engineering；superhigh arch dam；foundation failure；reinforcement；stability analysis；mechanical parameter of rock mass  1 引 言 1.5×1011 N[2]，锦屏一级拱坝水推力约1.3×1011 N[3]，小湾拱坝水推力约1.6× 1011 N[4]。当拱坝承受巨大水推力时，就要求建在Malpassat坝溃坝的原因和基础的渗流作用影响的