Research On Temperature Cracks Of Grouting Gallery Concrete In Rockfill Dam During Construction Period

In order to satisfy the construction and operation of concrete dam,normally we need to set various orifices and corridors in the dam.The temperature and distribution of stress will be changed by orifices at different degree,thus it will make the stress and deformation of concrete become complicated,produce many issues in concrete structure' stress concentration.This paper is about foundation cushion layer and corridor concrete structure of the core wall rock-fill dam,which are poured on the bed rock directly and constrained strongly by basis.Orifice structure normally owns many heat-dissipation layers which are of different ability in heat dissipating,it is complicated in the inner and outer constraints.Changes of temperature is a important factor in the cracks of hydraulic concrete structure,Analysis of temperature and the calculate of temperature will affect the function which temperature stress to cracks.In this paper the finite element software was used to build a model of foundation cushion layer and corridor concrete structure,make use of the FORTRAN language made by myself to analysis 3D unstable temperature field and creep stress field.By consulting domestic literature and data,summarizing the temperature control which can control cracks in concrete structure,introduce the numerical analysis method of concrete temperature field and stress field,and compare and analysis the influence of pouring temperature to the temperature field and stress field.At last,building a model of core wall rock-fill concrete construction,which can calculate different kinds of project to ma tch the concrete crack simulation results,then we can put out some measures to control temperature.The result turn out the measures we take are reasonable,it can put down the maximum of adiabatic temperature rising and stress,temperature differences between the inner and the outside of concrete decreases at the same time.