Study On Dynamic Visualization Of Numerical Analysis For Deep Excavation Engineering

Excavation engineering is an ancient subject. But with the increase of the depth of excavation and density of surrounding constructions, the traditional method has not been suited to the development of excavation engineering. So the concept of deformation control design has been represented. With the appearance of this concept, the corresponding numerical analysis method to compute the deformation in the constructing is quite required in calculation. Since FEM(fmite element method) is one kind of simple theory, which can simulate different clay and retrain structure, the complicated boundary condition , and the process of multistep construction, it has been applied in many fields. But a great number of data will be created in the process of simulation, especially in the multistep excavation simulated by FEM. The excavation engineering could be more intuitively analyzed if the data is visualized, and the multistep construction will be learned more deeply when the result of multistep excavation is dynamically visually simulated. So an applicable and reliable dynamic visualization software is in great need.In this thesis, the theory of simulation for excavation by FEM is analysed. Then a dynamic visualization software--AFTERDRAW, which aims at 2D elastic-plastic FEM, is programmed. AFTERDRAW is capable of drawing the deformation figures of material, the regions of plasticity and the regions of tension distributing figures, primary stress vector figures and primary strain vector figures. Besides, ATTERDRAW could realistically dynamically simulate the deformation of the whole process of construction. Finally, a excavation project in Beijing was simulated by NCAP-2D and AFTERDRAW and the result is credible by deeply analyzing.At the end of the thesis, several questions about dynamic visualization simulation and the direction of later study have been put out.