Numerical Modeling Of The Stress Field On Typical Geological Structures And Research On Uplift Of Tibet Plateau

In the last ten years,accompanying with the development of computers' speed, as a research way for modeling Earth dynamics, numerical method have progressed substantially.These numerical methods help scientists to build up various Earth dynamic models on mechanics,calorifics,rheology and so on.It makes scientists understand the Earth dynamics process, and also make the further research on the deep structure movements.ANSYS-a great finite element analysis software, is the dissertation's foundation.The ANSYS software is an Computing Aided Engineering software(namely,CAE) to calculate and analyze various physical and coupling fields by means of the finite element technology.The reason why ANSYS software is used in the paper is directly to build up the best calculation method, avert from unnecessary numeribal problem and make it think easily to design modelings and mechanical problems. I will fully make use of the numerical modeling technlogy and build up various geological struction models on the platform. After that,the relationship between different kinds of the physical boundary conditions and the responding mechanical fields will be analized by the results of the modeling typical geological structures,and also provide basical principals for the further research on the dynamic of Tibet Plateau.Tibet Plateau,the world ridge,praised for the third pole,is the youngest and largest continetal structure on the land. It is one of the classical problems on the continetal dynamics, and one of the hot issues on the earth dynamic models.Currently according to uplifting of Tibet plateau,scientists build up five different kinds of dynamics styles(or models):diving style, extrusion and thicken style, continent extruded style, mantel convection style and compound style.Although,to some extent, these syles can explain evolution of Tibet plateau and lead to some results which is consisted to some geophysical evidence , they are very uncertain and much different to each other .Therefore it is necessary to test these styles by the results from the mechanic models.This paper will build models from the following aspects:1,Basic mechanic modeling of basin,uplifting,folding,rift and jostle will be built up and analized.2,Based on the research of the basic mechanic modeling,coupling with papers on the Tibet Plateau, I will build up the crust and mantel condition boundary.3,Based on the crust and mantel condition boundary,coupling with evolution styles on the Tibet Plateau, I will analyze the modeling of uplifting of Tibet Plateau.