多场耦合下大体积混凝土初次蓄水的温度应力问题研究  

Research on Thermal Stress of Mass Concrete under Hydro-thermo-mechanical Coupling During Initial Impoundment

作　　者：严俊[1] 魏迎奇[1] 蔡红[1] 璩爱玉[2] 

机构地区：[1]中国水利水电科学研究院流域水循环模拟与调控国家重点实验室,北京100048 [2]环境保护部环境规划院,北京100012

出　　处：《湖南大学学报（自然科学版）》2016年第5期30-38,共9页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(51409278);国家重点基础研究发展计划(973计划)资助项目(2014CB047004)~~

摘　　要：在大体积混凝土坝初次蓄水时,温度较低的库水必然会对坝体温度场产生较明显的影响,从而影响坝体的变形,甚至产生温度裂缝.为分析大体积混凝土初次蓄水的温度应力,本文将混凝土类多孔介质视为连续介质,综合运用水力学、热学和固体力学等基本理论,根据动量守恒、质量守恒和能量守恒方程建立了以位移、孔隙水压力、孔隙气压力、温度和孔隙率为未知量的多场耦合数学模型,在此基础上编制了有限元计算程序,并对大体积碾压混凝土块的渗流场、温度场和应力场进行了耦合分析,结果表明,考虑耦合后块体温降幅度及温度大主应力均较不考虑耦合条件下大.During the initial impoundment of mass concrete dam, the reservoir water with low temperature would be critical to the temperature field of dam body, which affects the deformation of dam body and even results in temper- ature cracks. Therefore, in order to investigate the thermal stress distribution of mass concrete during the initial im- poundment, the concrete was assumed as a continuous porous media in this paper. In consideration of the basic theo- ries of solid mechanics, hydraulics, and thermodynamics, the multi-field coupling equations of unsaturated porous media that include momentum conservation, mass conservation, and energy conservation were provided as the function of displacements, pore liquid pressure, pore gas pressure, temperature, and porosity. The finite element analysis pro- gram was then developed. A mass roller-compacted concrete block was considered for coupling analyses on the seepage field, temperature field, and stress field. The analysis results show that the temperature reduction and principle ther- mal stress of the concrete block considering the multi-field coupling process are greater than those without the coupling effect.

关 键 词：多场耦合 数学模型 大体积混凝土 温度应力 

分 类 号：TU43[建筑科学—岩土工程]