严寒地区胶凝砂砾石材料冻融仿真研究

发布时间：2018-02-26 06:15

本文关键词： 胶凝砂砾石冻融损伤温度应力严寒地区　出处：《人民黄河》2016年08期 　论文类型：期刊论文

【摘要】：胶凝砂砾石坝研究起步较晚,故其冻融作用下的理论研究较少。在前人研究基础上,借鉴混凝土冻融损伤机理及模型和试验结果,建立了胶凝砂砾石冻融损伤模型;基于混凝土非线性控制微分方程及非线性热学特性的温度场、应力场理论,编制了适用于胶凝砂砾石的流固耦合三维有限元冻融全过程仿真分析程序,并进行案例分析。结果表明,不同地区胶凝砂砾石的冻融(负温)深度与最低月均气温及低温持续时间有关,冻融使得胶凝砂砾石受冻区域的应力分布极为复杂,胶凝砂砾石坝开裂风险增大。
[Abstract]:The research of cemented sand and gravel dam started late, so the theoretical study of the dam under the action of freeze-thaw is less. On the basis of previous research, the damage model of frozen and thawed concrete is established based on the damage mechanism and model of concrete freezing and thawing. Based on the nonlinear control differential equation of concrete and the temperature field and stress field theory of nonlinear thermal characteristics, a simulation program for the whole freeze-thaw process of fluid-solid coupling three-dimensional finite element method is developed for cementing sand and gravel. The results show that the depth of freezing and thawing (negative temperature) of cemented sand gravel is related to the minimum monthly mean temperature and the duration of low temperature, and the freezing and thawing makes the stress distribution in the frozen area of cemented sand gravel extremely complex. The risk of cracking of cemented sand and gravel dam is increased.
【作者单位】：华北水利水电大学;水资源高效利用与保障工程河南省协同创新中心;
【基金】：水利部公益性行业科研专项(201301025)
【分类号】：TV41

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