关键词: 大陆碰撞, 板内应力, 三维模型, 数值模拟

Abstract: A three dimensional elasto-plastic model was established to explore the mechanical aspects of the India-Asia continental collision by finite element modeling. The results show that the orientations of the principal stresses and the potential faulting types depend on the loading boundary conditions. The push force of the moving India plate results in stress state of thrust and strike-slip types within the Asia continent. The iso-lines of the equivalent stress are characterized by northwest trending arc-form distribution which is consistent with the tectonic feature of west China. The heterogeneity of the model could rise significiant effects on the patterns of the crustal deformation and the stress distribution. The plastic flow in the lower lithosphere and the asthnosphere could make the stress transmitting in the upper lithosphere reach to a much greater extent. The existence of the harder blocks lead to appearance of the relative highstress gradient. For the India-Asia continental collision, the low-angle underthrustingmodel seems to be more reasonable and acceptable than the horizontal indenting model.

Key words: Continental collision, Stress of plate interior, Three dimensional model, Numerical modeling