The Sensitivity Analysis on Thermal Stress of Rolled Compacted Concrete Dam Mixed Gentle MgO Swelling Concrete

摘要

Autogenous volume deformation is an important parameter for anti-cracking behaviors of concrete. In this paper, based on the heat transfer theory, elasticity creep theory and theory of finite element, the simulate program on calculating the temperature field and temperature creep stress field of rolled compacted concrete dam during construction period and operation period is compiled. The sensitivity analysis about the influence of concrete autogenous volume deformation on thermal stress of rolled compacted concrete dam is carried out based on simulation of temperature field. The results show that: (1) The stress compensation in the strong restrained zone of dam are apparent;(2) The higher curing temperature, the bigger autogenous volume deformation, it benefit to the dam body anti-crack; (3) The influence of rate of swelling to the thermal stress in early age is not big.