Temperature Field Calculation And Inverse Analysis Of Shiplock Structures Located In Rock Mass During The Construction Period

With the development of economy, mass concrete structures are widely used inengineer practice, and their thermal stress problem continues to increasingly attract ourattention. However currently, the simulation analysis of mass concrete structures for theprocess incorporating multiple factors still faces many difficulties, which introduced a lotof challenging research. Focusing on some problems still unresolved in simulationanalysis, to ensure the precision of numerical simulation and the authenticity of calculatedparameters, some research works have been done this dissertation as follows:1.Under the reaction of conflicted factors such as the environment temperature change,water temperature, and hydration heat rise of concrete itself, concrete temperaturechanges greatly and heat transfers occur along every dimension. So in many cases, one ortwo dimensional heat transfer models reduce the calculating workload, but cannot satisfythe requirement of calculating precision, especially for the solution of temperature field inconstruction stage. It is needed to set up a3D heat transfer model to make analysis abouttemperature field. Based on the mass concrete of Changsha integrated hub, thisdissertation used the numerical to calculate the temperature filed and temperature stress.2.Take mass concrete on batholith as a typical, A mass concrete of size20m×17.5m×7.5m in Changsha integrated hub tail bay is taken prototype observation during theconstruction period. By analyzing the temperature filed, the main conclusion is asfollows: The temperature of mass concrete is rising rapidly caused by heat of hydration ofcement after casting. The temperature of node on the structure surface achieve themaximum cost only1~3days or so,while the node in the internal structure cost3~8days,and the maximum in the internal structure is higher than the maximum on the structuresurface in general; the thickness of the concrete is the most important effect of thetemperature, the greater the thickness, the higher the maximum of the concrete.3.On the basis of genetic algorithm which used for feedback analysis of thermalcharacteristic parameters, MATLAB and ANSYS are joint to feedback analyze thethermodynamic performance of mass concrete. The conclusion shows that the temperaturecalculated by the feedback thermodynamic performance and the measured data Thisdissertation agrees quite well, so that the inversion parameters can simulate thetemperature filed and temperature stress of mass concrete more accurate to guide theengineering.