用有限元方法研究含摩擦多断层周围的应力场

本文使用有限元方法,研究了含摩擦多断层问题.在研究中,计算了几个物理模型（如共线、共轭等）和含摩擦多断层的应力场,并用计算机绘制出一批含摩擦多断层应力等值线图.结果表明,含摩擦多断层的应力场与单一断层相差甚远,在断层的交汇处,应力集中的范围和程度远大于断层的外端;断层的应力场在空间上分布很不均匀;高应力区和低应力区的分布随载荷作用方式和断层的形态各异.断层内的摩擦力对应力场的分布有很大的影响,并可能对断层的扩展行为起着非常重要的影响.

THE STRESS FIELD FEATURES IN THE MULTI-FAULTING MEDIUM WITH FRICTION

In this paper, we investigate the stress field features in the multi-faulting medium with friction by means of finite element method and give, to co-line and conjugate physical models, their contours of stress distribution respectively.The results show that the stress field features in the multi-faulting medium with friction are very different from ones in the medium with only single fault. At the places which faults are adjoined the intensity of the stress concentration is much larger than fhat outside fault. The pattern of the stress field varies with distribution of faults and loading ways as well as the friction between two sides of the fault which also plays very important role in the development of the faulting.