【摘要】 本文依据渭河断陷盆地区地幔隆起，且隆起轴与盆地轴向基本一致，以及盆地区和周界断层的现今活动性均表现为正断活动特征这样一些事实，运用剖面和三维有限元数值分析手段，模拟了地幔隆起条件下盆地区的应力场。说明了地幔隆起可在盆地区产生拉张环境，正是这种拉张应力场导致了地裂缝的产生。通过数值模拟同时也揭示了地幔隆起与盆地沉陷之间的关系。文中还探讨了地幔隆起停止后应力场随时间变化的规律。更多还原

【Abstract】 Based on the facts of earth mantle rising and peripheral faults are normal-slip fault at Weihe Fault Basin, a 2-D and 3-D numerical simulation model of finite element method are used to analyze the present stress field. The simulation results show that a tension stress field is produced with mantle lifting up. It is responsible for ground fissures on the surface in the basin. The relationship between mantle rising and basin subsidence as well as the developing process of stress field when the earth mantle stops to rise are also discussed in this paper.更多还原