大体积混凝土正日益广泛地应用于建筑工程领域。大体积混凝土因其离散性和本身的特殊性使得目前对裂缝产生的机理研究还不成熟。这就要求我们对混凝土的开裂机理、裂缝发展、评价体系和控制措施进行深入研究。 本文首先从混凝土裂缝形成的机理分析入手，首先分析大体积混凝土裂缝形成的原因、主要影响因素以及相应的控制措施。接下来以理论为基础，从设计、材料、施工等方面提出综合措施以预防和控制大体积混凝土温度裂缝的开展。同时运用大体积混凝土开裂机理研究分析大体积混凝土温度场并建立起相应的物理模型和三维瞬态温度场数学模型。最后综合考虑混凝土内外约束和徐变变形，借助有限元分析程序ANSYS8.0和MIDAS/Gen通用平台，对混凝土瞬态温度场和温度应力场进行仿真。本文结合宁波电信综合楼基础温度场和应力场模拟结果研究大体积混凝土内部温度场和温度应力场的变化规律。ANSYS8.0和MIDAS/Gen的模拟结果表明在计算大体积混凝土的温度场时应当充分考虑混凝土与土壤的相互影响，在大体积混凝土温度场计算时要确定合适的水化热系数值。最后综合现场监测数据、ANSYS8.0 和MIDAS/Gen的计算结果对大体积混凝土基础温度裂缝提出有效控制措施。通过对宁波电信综合楼大体积混凝土浇筑温度场和温度应力场的仿真分析表明，本文所建立的有限元分析模型能够很好地仿真实际混凝土温度场和温度应力场。 本文提出的考虑混凝土与土壤相互作用的温度场，确定的基础大体积混凝土温度场水化系数的取值以及建议采用的现场温度裂缝控制措施，对今后建筑工程大体积混凝土温度裂缝防控工作具有一定的参考价值。

The mass concrete is being used widely in construction works. As the result of mass concrete's discrete and peculiar character, the study of the mechanism of crack generation and propagation of mass concrete is still under scrutiny. These problems request us to do more researches on cracking mechanism, cracking development, assessment criteria and cracking control methods. In this paper, the first, based on the mechanism of concrete crack, the cause, main factors and measures are analyzed. On the basis of the combination of theory, control method of temperature cracking has been suggested from the design to construction, and so on. In the article, the mechanism of temperature field has been researched and the physical model and the mathematical model of 3 Dimention transient temperature field is established according to analyze the cracking reason, produce mechanism of temperature crack. According to consideration of restriction and creep deform in mass concrete, based on the common purpose flat of ANSYS8.0 and MIDAS/Gen, which can simulate the transient temperature field and the thermal stress field in mass concrete, is compiled in this paper by using many internal functions of the finite element program ANSYS8.0 and MIDAS/Gen. The analysis of the stimulating data of temperature and thermal stress at the foundation of the Ningbo Telecom Building, study the regulation for changing of internal temperature field and thermal stress field of mass concrete. The results simulated from ANSYS8.0 and MIDAS/Gen indicates that interaction between concrete and soil should be considered enough when mass concrete temperature field of foundation in mass concrete is calculated. And choice the rational data of hydration coefficient is determined on calculating mass concrete of foundation. At last, combining the test data with the ANSYS8.0 and MIDAS/Gen result, some effective measures about crack control in construction are summarized. The temperature field and the thermal stress field of the Ningbo Telecom Building foundation is simulated and the computational results are compared with the experimental results. The results shown that the finite element model in this paper is correctly set to simulate the temperature field and the thermal stress field of the concrete in practice. It can be referred to the study on mass concrete of foundation for interaction between concrete temperature field and soil temperature field considered, choice range of hydration coefficient determined, and measures about crack control in construction summarized in this paper.