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深覆盖层上高面板坝应力变形性状研究【作者】孙大伟 【导师】郦能惠

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o'A)R8qo&F0覆盖层上高面板坝应力变形性状研究水利论文}8n7k @d.sq

,^ w.o%s+^ xg J0【作者】孙大伟导师郦能惠
w9P!MdOH0【作者基本信息】南京水利科学研究院,岩土工程,2006年,博士

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【中文摘要】 随着水利水电工程建设的发展,越来越多的面板堆石坝将不可避免地修建在深厚覆盖层地基上。因此,系统地研究覆盖层上面板堆石坝的应力变形性状及其计算方法具有重要的理论意义和实用价值。本论文主要做了以下几个方面的工作: (1) 面板堆石坝有限元计算的网格剖分工作不仅十分繁琐、而且耗时,网格质量好坏直接关系到有限元计算结果的准确性。本文选择了专业前处理软件TrueGrid进行了二次开发,对吉林台面坝三维有限元网格进行了加密,可以解决混凝土面板单元应力变形计算结果精度低的问题。 (2) 在计算结果可视化方面,编写了与软件Tecplot接口程序,实现了计算结果三维彩色出图。三维云图具有简洁、形象、直观等特点,由于Tecplot采用了OpenGL渲染技术,三维云图3D显示效果优异。 (3) 选取察汗乌苏面板坝这座覆盖层上高面板堆石坝为分析实例,编制了相应的三维有限元程序,采用三维Goodman单元来模拟防渗墙与砂砾石覆盖层间的接触面,深入分析了深覆盖层上高混凝土面板堆石坝的应力变形性状,提出了在蓄水前再浇筑连接板,并对连接板下卧的覆盖层先采用振动碾压实等工程措施以减小防渗墙与覆盖层之间接缝错动。 (4)...更多 以往防渗墙在平面上通常呈直线布置,防渗墙在靠近左右两岸的部位及顶部存在较大的拉应力,易导致混凝土开裂并产生渗漏,影响大坝的安全。为此,提出了以圆弧型防渗墙替代常规的直线型防渗墙来减小防渗墙拉应力的新设想,并进行了数值计算验证。 (5) 面板堆石坝面板上两侧部位的拉应力较大,个别部位拉应力甚至超过规范的设计抗拉强度。为此,提出了以折线型面板替代直线型面板来减小面板上拉应力的新设想,并进行了数值计算验证。  还原

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Fww!x,H0`i2pj0【英文摘要】 More and more concrete face rockfill dams (CFRD) will be built on thick alluvium deposits with the development of hydropower projects. The study on stress-deformation calculation method of high CFRD built on thick alluvium deposits has both theoretically significance and application value. The main points of this doctoral dissertation are listed as follows.1. The processing of 3D mesh of CFRD for finite element calculation is not only complicated but also time-consuming. The mesh quality has great influence on the accuracy of results of stress-deformation analysis. To solve this problem, the 3D FEM mesh of Jilintai CFRD has been intensified with the help of software TrueGrid.2. In order to transfer finite element calculation results to post- processing software Tecplot, a program is written. 3D flood mode pictures of FEM results drawn by Tecplot are concise, vividly and intuitionistic because of OpenGL technique of Tecplot.3. A 3D finite element method procedure has been written and 3D...更多 Goodman element is adopted to simulate the interface between diaphragm wall and alluvium deposits. A high CFRD - Chahanwusu CFRD has been chosen as an example to study the stress-deformation behavior of high CFRD built on thick alluvium deposits. The stress-deformation behavior and its influence factors have been obtained.4. A new idea— arc type diaphragm wall, is suggested in the article to diminish the big tensile stress distributed the zones near by the both riversides and the top zone of the concrete diaphragm wall, which usually leads to cracking of diaphragm wall and decreases the safety of diaphragm wall and dam. Comparison between the stress-strain behavior of arc type diaphragm wall and that of plane type diaphragm wall is made by using 3D finite element analysis. The calculation result shows that the tensile stress of arc type diaphragm wall is much less than that of plane type diaphragm wall although the compression stress of arc type diaphragm wall is a little larger. Since the tensile  还原

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myAx:q$q/v0【中文关键词】 覆盖层; 混凝土面板堆石坝; 后处理; 数值计算; 应力变形性状; 接触面; 折线型面板; 弧型防渗墙水利论文(\-NE{B'\!Ox#@v
【英文关键词】 alluvium deposits; concrete face rockfill dam; post- processing; numerical calculation; stress-strain behavior; interface; broken line type face slab; arc type diaphragm wall
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