碾压混凝土重力坝施工过程温度仿真分析研究

发布时间：2018-10-19 20:50

【摘要】：碾压混凝土具有施工简便快捷、成本低廉等优点。与传统大体积混凝土和常态混凝土类似,碾压混凝土同样存在温度开裂的问题。混凝土的开裂主要有应力的不均匀分布引起的,而温度场的变化直接引起应力场的变化,因此对温度场的研究能为温控设计和混凝土防裂提供参考,众所周知,碾压混凝土坝的施工方法和材料特性不同于常态混凝土,因此,常态混凝土的温度场也有别于碾压混凝土。目前,碾压混凝土(RCC)呈现快速发展的态势,对其不同工况组合下的温度场研究具有很大的现实意义。本文就利用仿真软件来模拟坝体施工全过程的温度场分析。并对模拟结果进行分析探讨。论文以有限元软件ANSYS作为平台,用APDL语言编制碾压混凝土(RCC)重力坝施工期的温度场模拟分析程序。结合生死单元模拟分析了大石涧水库非溢流坝段的施工过程温度场变化,分析过程中考虑了大气温度变化、水泥水化热、温控措施等主要因素。经过计算得到坝体剖面温度场等值线图,为更好的研究温度变化规律,论文设置坝体典型点,计算得出典型点温度历时曲线。对模拟结果进行分析,复核在该碾压混凝土重力坝施工设计中的温控措施是否满足要求,对碾压混凝土重力坝的温控及防裂措施、以及温度场研究方向进行了探讨,论文研究成果供碾压混凝土重力坝温控防裂设计借鉴和参考。
[Abstract]:Roller compacted concrete has the advantages of simple and fast construction, low cost and so on. Similar to traditional mass concrete and normal concrete, RCC also has the problem of temperature cracking. The cracking of concrete is mainly caused by the uneven distribution of stress, and the change of temperature field directly causes the change of stress field. Therefore, the study of temperature field can provide a reference for the design of temperature control and crack prevention of concrete, which is well known. The construction method and material characteristics of RCC dam are different from that of normal concrete, so the temperature field of normal concrete is different from that of RCC. At present, roller compacted concrete (RCC) (RCC) is developing rapidly, and it is of great practical significance to study the temperature field of RCC under different working conditions. In this paper, the simulation software is used to simulate the temperature field in the whole process of dam construction. The simulation results are analyzed and discussed. In this paper, the finite element software ANSYS is used as the platform and APDL language is used to compile the temperature field simulation analysis program of RCC (RCC) gravity dam during construction period. The temperature field in the construction process of the non-spillway dam section of Dashijian Reservoir is simulated with the birth and death unit. The main factors, such as atmospheric temperature change, cement hydration heat and temperature control measures, are considered in the process of the analysis. The contour map of temperature field in dam section is obtained by calculation. In order to study the temperature variation law better, the typical point of dam body is set up and the curve of temperature duration of typical point is calculated. The simulation results are analyzed, and the temperature control measures in the RCC gravity dam construction design are checked whether the temperature control measures meet the requirements. The temperature control and crack prevention measures of the RCC gravity dam and the research direction of the temperature field are discussed. The research results can be used as reference for temperature control and crack control design of RCC gravity dam.
【学位授予单位】：华北水利水电大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV544.921

【参考文献】