胶凝砂砾石坝静动力应力变形特性有限元分析

发布时间：2018-03-09 16:47

本文选题：胶凝砂砾石坝　切入点：应力变形　出处：《西安理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：胶凝砂砾石坝是目前尚处于发展阶段的新坝型,其静动力应力变形特性及相关因素的研究相对较少,本文对其静动力应力变形特性的研究工作.具具有一定的理论意义和工程实践意义。首先,本文对胶凝砂砾石坝的研究进展进行了全面的分析与总结;然后,对现有的几种胶凝砂砾石材料静动力本构模型进行了对比分析,在此基础上选择了较为适宜的本构模型:其次,运用正交试验法进行胶凝砂砾石坝静力应力变形特性关于相关顺素的敏感性研究,运用单因素分析法研究相关因素对坝体静动力应力变形的影响规律,结果果表明:(1)静力作用下,坝体应力变形特性对相关因素的敏感程度由大到小依次为:坝高、胶凝含量、上下游坝坡坡比:随坝高的增加,坝体应力变形均有所增增加,随胶凝含量的增加,坝体位移有所减小,应力增加:坝体水平位移受上下游坡比的影响较大,且随上下游坝坡坡比的变缓而减小。(2)动力作用下,随坝高的增大,坝体动力响应增大;随胶凝含量的增多,坝体动力加速度及应力增大,位移减小;随上下游坝坡坡比的变缓,坝体动力加速度增大,位移及应力减小。最后,结合守口堡水库胶凝砂砾石坝实例,进行了该坝静动力应力变形特性有限元分析研究,结果表明:(1)静力作用下,完建期坝体水平位移基本对称,从坝轴线到两侧坝坡逐渐增大.蓄水后,坝体产生向下游的水平位移:坝体最大竖直位移发生在坝体中部;坝体应力分布规则,完建期均为压应力,蓄水工况下,上游靠坝基面出现拉应力区,但拉应力较小:(2)该坝采用常态混凝土作为上下游坝面防渗层,在动力作用下,坝体最大、最小主应力出现在下游坝坡底,出现应力集中现象。本文的计算分析结果可为工程设计提供重要的参考依据,本文的研究方法和研究成果对类似工程问题的研究具有较好的借鉴意义。
[Abstract]:The cemented sand gravel dam is a new type of dam which is still in the development stage at present. There are few studies on the static and dynamic stress and deformation characteristics and related factors of the dam. This paper studies the static and dynamic stress-deformation characteristics of the dam. It has some theoretical and practical significance. Firstly, this paper makes a comprehensive analysis and summary of the research progress of cementing sand and gravel dam. The static and dynamic constitutive models of several kinds of cemented gravel materials are compared and analyzed. On the basis of this, a more suitable constitutive model is selected. Secondly, The sensitivity of static stress and deformation characteristics of cementing sand gravel dam is studied by orthogonal test method. The influence of relative factors on static and dynamic stress and deformation of dam body is studied by single factor analysis method. The results show that the sensitivity of stress and deformation characteristics of dam body to relative factors under static force is as follows: dam height, cement content, slope slope ratio of upstream and downstream dam: with the increase of dam height, the stress and deformation of dam body increase, and the stress and deformation of dam body increase with the increase of dam height. With the increase of cementitious content, the displacement of dam body decreases and the stress increases: the horizontal displacement of dam body is greatly affected by the ratio of upstream and downstream slope, and decreases with the increase of slope ratio of upstream and downstream dams. The dynamic response of the dam body increases with the increase of the cementitious content, the dynamic acceleration and stress increase, the displacement decreases with the increase of the slope ratio of the upstream and downstream dams, and the dynamic acceleration increases and the displacement and stress decrease with the increase of the slope ratio of the upstream and downstream dams. The finite element analysis of static and dynamic stress and deformation characteristics of the cemented sand gravel rockfill dam of Shukoubao reservoir is carried out. The results show that the horizontal displacement of the dam body is basically symmetrical during the construction period under the static force. The dam slope gradually increases from the axis of the dam to the two sides. After impounding, the dam body produces horizontal displacement downstream: the maximum vertical displacement of the dam body occurs in the middle of the dam body, the stress distribution of the dam body is regular, the complete construction period is the compressive stress, and under the condition of water storage, the maximum vertical displacement occurs in the middle of the dam body. The dam adopts normal concrete as the impervious layer of the upstream and downstream dam surface. Under the dynamic action, the dam body is the largest and the minimum principal stress appears at the bottom of the downstream dam slope. The results of calculation and analysis in this paper can provide an important reference basis for engineering design. The research methods and results of this paper have a good reference significance for the study of similar engineering problems.
【学位授予单位】：西安理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV64

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