碾压混凝土坝非稳定温度场、温度应力及其温度控制

针对辽宁省九五重点工程某水库碾压混凝土坝的整体规划与设计要求，有关设计与施工部门一起，提出了九个有关大坝施工和温度控制方案．本文针对各个方案的大坝升层填筑方式，坝址气温变化条件，混凝土各种时变特性（强度特性、蠕变特性、自生体积变形、添加剂氧化镁自身体积变形，弹性模量等），提出了较为复杂的计算模型，并采用有限单元法对大坝进行了非稳定温度场，温度应力，总应力的计算，研究了各种大坝温度控制方案优越点，提出最佳方案．经工程会议鉴定，计算成果正确，计算精度较高，为相关设计、施工单位采纳为施工招标，设计与施工的依据之一．

The Analysis of Non-steady Temperature Field, Thermal Stress, Global Stress and Temperature Control for Roller Compacted Concrete Dam

Thermal Stress is the main stress of concrete dam. The finite element method is adopted in the emulation of thermal stress of roller compacted concrete gravity dam. The temperature field is calculated with explicit differential scheme. Solving of equations is not necessary and temperature on every time point can be calculated directly. The calculation of stress field for the dam includes the action of dead load, static hydraulic pressure, thermal stress, the self-volume deformation of different concrete, the elastic modulus changing in-time, the age the creep of concrete. Different Temperature control schemes are compared, and the optimal scheme is presented for engineering design and construction.