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混凝土面板堆石坝面板变形特性研究
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摘要
混凝土面板堆石坝是近二三十年来快速发展的一种新坝型,具有结构简单,就地取材,施工方便,导流要求低,工期短,造价低等优点,发展前景非常好。
     混凝土面板堆石坝是以刚性材料作为防渗面板的,面板是面板堆石坝防渗的主要结构,所以混凝土面板对面板坝的安全运行非常关键。满足抗渗性、抗裂性和耐久性是混凝土面板的主要要求。长期以来国内外专家们对面板堆石坝作了大量研究,提出许多很有用的模型。然而,对面板应力变形特性的分析及研究还未取得一致的认识,众说纷纭。本文就混凝土面板坝面板结构应力的影响因素及各因素对混凝土面板应力的影响规律做一些探讨,着重对面板堆石坝变形特性进行较为深入的分析研究,主要内容如下:
     (1)本文从计算方法、堆石本构模型、特殊边界接触面的模拟、施工加载方式等方面分析对混凝土面板变形及面板应力的影响。
     (2)分析混凝土面板变形特性,用解析的方式分析单一因素下面板应力变形,分析面板破坏规律,为以后解析准确确定面板应力变形提供一个方向和方法思路。
     (3)研究了面板堆石坝材料的本构模型,在ADINA软件基础上进行二次开发,实现了堆石体自重的分级加载,编制了邓肯—张E-B模型子程序,建立了面板堆石坝三维有限元分析模型。
     (4)以天生桥面板堆石坝为例,分析了堆石体和面板变形特性;利用实测资料和已有分析方法分析天生桥面板挠度的变形模式;利用ADINA软件及编制的子程序对天生桥面板堆石坝进行三维有限元计算,分析了实际加载方式和改进后加载方式两种情况下面板堆石坝的变形特性。
     (5)明确指出混凝土面板堆石坝中面板变形与堆石变形尽量保持协调一致的重要性。
Concrete Faced Rockfill Dam is one kind of fast development new dam in the near 20-30 year, and has some merits such as the structure to be simple, making use of local materials, the convenient construction, the conduction current low request, the short construction time, the low construction cost, so the prospect for development is very good.
     The Concrete Faced Rockfill Dam takes the anti-seepage concrete face by the rigid material, the concrete face is anti-seepage primary structure of Concrete Faced Rockfill Dam, therefore, the concrete face is essential to dam's safe operation. Satisfying the impermeability, the crack resistance and the durability is overriding demand to the concretes face. So long the domestic and foreign experts have done the massive research on Concrete Faced Rockfill Dam, and have proposed many very useful models. However, People have not obtained the unanimous understanding to the concrete face strain characteristic analysis and the research, and have wide divided opinions. This article makes some discussions on structural stress's influencing factor and various factors to the concrete face stress's influence rule, and conducts the more thorough analytical study to distortion characteristic emphatically, and the primary coverage is as follows:
     (1).This article from aspects such as calculation method, rock constitutive model, special bounding surface simulation, construction load way analyze influence rule to concretes face distortion and face stress.
     (2) This article analyzes the concretes face distortion characteristic, and attempts with the analytic way to analyse face strain in only a factor instance, and analyze to destroy the rule to concrete face, provides a direction and the method mentality for the later analysis accurate determination face strain.
     (3) Has studied constitutive model of Concrete Faced Rockfill Dam material, and carries on the re-development in the ADINA software foundation, and has realized the graduation load which the rockfill is self-possessed, and has established Duncan-zhang E-B model subroutine, and has established three dimensional finite element analysis model of Concrete Faced Rockfill Dam.
     (4) Take Tian Sheng Qiao faced dam as an example, and has analyzed the rockfill and the face distortion characteristic; Uses the actual data and the prevenient analytic method to analyze deflection distortion pattern of Tian Sheng Qiao faced dam; Carries on the three dimensional finite element computation to Tian Sheng Qiao faced dam using the ADINA software and the establishment subroutine, having analyzed Tian Sheng Qiao face’s distortion characteristic in two kind of situations on the actual load way and the improvement loads way.
     (5) Point out explicitly the cardinal principle of compatibility of rock deformation and face deformation in Concrete Faced Rockfill Dam.
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