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特高拱坝建基面嵌深优化设计分析与评价【作者】王仁坤 【导师】潘家铮; 周维垣

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特高拱坝建基面嵌深优化设计分析与评价

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【作者】王仁坤导师潘家铮; 周维垣
zl nh5Q0【作者基本信息】清华大学,水利工程,2007年,博士水利论文l'r@-k)aH&h

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l-@ f!BMlC0【中文摘要】 特高拱坝建基面嵌深优化设计(本文简称建基面优化)的分析与评价,是当前高坝建设领域的难点和热点研究课题之一,具有重要的学术和工程意义,对于制定特高拱坝设计准则或修订新的工程规范具有一定的参考价值。本文在前人研究成果的基础上,从研究节理岩体的破坏机理出发,建议了岩体弹塑性损伤本构模型;运用弹塑性损伤理论和最小余能原理推导了基础加固力的量化计算方法;建议了特高拱坝常规安全分析与非线性仿真分析的评判标准,并将其应用到溪洛渡特高拱坝的建基面优化设计。本文主要内容及创新成果如下:(1)通过试验模拟三维应力状态下三维节理岩体的细观损伤开裂破坏,分析了影响节理岩体破坏强度的因素。在试验和现场概率统计的基础上,从损伤力学出发,探讨了节理岩体力学参数的不同损伤张量计算方法,建议了考虑节理岩体起裂、扩展准则的弹塑性损伤本构模型,并提出了有限元实现流程。(2)基于拱坝整体三维非线性有限元分析,运用弹塑性损伤理论和最小余能原理,推导了基础加固力的计算方法,实现了拱坝基础加固力的量化计算。(3)提出了特高拱坝建基面优化设计原则,总结了建基面优化设计的步骤和详细的工作流程,讨论并拟定了特高拱坝安全分析方法的评价内容...更多与参考准则,初步提出了特高拱坝建基面嵌深优化设计分析与评价体系。(4)对溪洛渡拱坝三种建基面方案,在常规安全分析评价的基础上,重点比较了三维非线性有限元整体稳定分析和地质力学模型试验研究成果。论证了溪洛渡拱坝基础利用Ⅲ1级岩体和上部高程部分利用Ⅲ2级岩体作为大坝基础的可行性;建基面优化方案较可研方案减少基础开挖和大坝混凝土工程量各100多万m3,节省直接投资约6亿元,经济效益十分显著。  还原

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【英文摘要】 Analysis and evaluation on optimization of design for foundation interface of super high arch dams is one of the most important research fields of hydraulic engineering. It is significant also for engineering and academic study, and for proposing new design criteria of super high arch dam or revising arch dam design standard. This thesis investigated the failure mechanics of jointed rock mass for proposing a plastic damage model of jointed rock mass, then, carried out quantitatively analysis of reinforcement force by employing the reinforcement theory considering deformation mechanism of rock mass. This thesis also proposes evaluation criteria for super high arch dam based on general analysis and nonlinear numerical simulation method, and applies proposed criteria for optimization of foundation interface of Xiluodu arch dam. The major contents of this thesis are as follows:(1) To investigate the failure process and peak strength of rock mass containing 3D(three dimension) joints under ...更多3D compression, a serial of the physical test on 3D jointed specimen made by Xiluodu rock mass for obtaining the qualitative relationship of peak strength and damage were carried out. Based the experimental results and in situ probability investigation, a plastic damage model of jointed rock mass in considering crack initiation, propagation and interaction is proposed. In this thesis, the work flow of finite element method with applying this model is given.(2) Based on 3D nonlinear finite element method for analyzing the integrity stabilization of arch dam, by using non-equilibrium elastic-plastic damage mechanics, and minimum plastic complementary energy principle, the reinforcement theory considering deformation mechanism of rock mass is proposed, which can quantitatively calculate the reinforcement force of foundation in dam toe area.(3) In this thesis, an evaluation criteria, design concept and flow of optimization of design, evaluation data and criteria of typical stability analysis methods are discussed for proposing the analysis and estimation system on optimization of design for foundation interface of super high arch dam.(4) Based on general evaluation method, the 3D nonlinear finite element method and 3D geomechanical model test, by employing the proposed analysis and estimation system, different foundation excavation cases of Xiluodu arch dam including research case, optimization case and comparison case, respectively, are analyzed and evaluated. The investigation results demonstrated the feasibility of using III1, III2 typical rock mass as foundation interface of Xiluodu arch dam. With the optimization case in Xiluodu arch dam, to compare the research case, the excavation of foundation and concrete quantities of dam will minimize about one million cubic meters; as a result, nearly 600 million RMB of investment is saved.  还原

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j a3z+m6g4z-Tn0【中文关键词】 特高拱坝; 建基面优化; 节理岩体; 加固力; 评价体系
q*sxu$Rl%w,n9jP f ^0【英文关键词】 Super-high arch dam; optimization of design for foundation interface; jointed rock mass; reinforcement force; evaluation system
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TAG: 导师 拱坝 潘家铮 王仁坤 周维垣
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