Finite Element Analysis And Testing Research Of Temperature Stress Of Nuclear Reactor Plant Raft With Merge Concreting

The base slab of the reactor building is one of the main support parts， which iscorroded by seawater in the coastal areas and is needed to prevent nuclear leakage，so it’s extremely strict about crack for the durability and tightness. Bulky pouring，high concrete strength and large heat of hydration make it difficult to controlconstruction cracks. At the foreign and domestic nuclear plants delamination orsubregion had been adopted normally for mass concrete construction， but theconstruction period extended and still had more serious cracks appeared， which hadpaid great costs to deal with them. With the rapid expansion of the nuclear powermarket and shorten the overall period， the merge concreting which can bring muchhigh benefit should be studied.This paper presents it is feasible to the merge concreting with multi-layersegment， and carry out the theoretical analysis and testing of mass concretetemperature and temperature stress-strain field under the guidance of the finiteelement method. Through compiling the finite element software and establishingmodel， the simulation analysis about the impact of different pouring thickness，different sliding ability， different conservation methods and technical indicators toconstruction temperature stress has been done. The results proved that the mergeconcreting is superior， waterproof layer acting as sliding layer is necessary，dynamic and differential construction curing methods are important to adjust thetemperature stress field and reduce the risk of cracking. At the same time， the papercarries out a comprehensive study of the shrinkage， and a unconstrained device forconcrete is developed for monitoring the free deformation in different curing methods.In short，the subject puts forward the dynamic design curing methods which givethe general ideas for construction crack control of mass concrete and can provide thehelp for optimizing and designing construction program. Practice has proved thatunder the theoretical system the base slab merge concreting of dozens China’s nuclearplant reach success. All these have created considerable economic and social benefitsfor our National economy.