Sensitivity analysis of temperature control for concrete structure of inverted siphon underground culvert

In view of the character of concrete structure of inverted siphon underground culvert and the problem of concrete crack in the period of construction, this paper introduced the main factors which influence the temperature and stress of concrete structure, and the main cause of crack is closely related to placing delaminating, interval time, cold wave strike, diurnal amplitude, superficial thermal insulation and cooling pipe. A case is presented where the 3D FEM simulation of thermal field and stress field of concrete and the numerical algorithm of pipe cooling are adopted to study the sensitivity degree of these factors. It is considered that placing delaminating and interval time greatly Influence the Integrity Deformation Compatibility of concrete structure, and cold wave strike and diurnal amplitude induce adverse effects to crack prevention of surface, and suitable thermal Insulation and cooling pipe greatly improve anti-crack performance of concrete structure. Finally, the paper put forward temperature control measures for crack prevention based on the research results.