断层蠕滑作用下活动断裂带地应力分布研究

Geostress Distribution of Active Fault Zone under Fault Creep

采用非连续变形分析(DDA)方法研究断层蠕滑过程中嘉黎活动断裂带区域应力分布的变化规律。结果表明,断层蠕滑会导致岩体中应力明显增长,随着深度的增加应力有相近的变化趋势;断层破碎带中的应力普遍低于两侧岩体中的应力;断层蠕滑会使岩体内发育大量裂隙,造成破碎岩体中应力分布不连续;断层破碎带及其两侧岩体中出现应力集中的区域在不同深度下的分布有一定的相似性。

Based on discontinuous deformation analysis(DDA),we take an area from the Jiali fault region as an example to explore the changes of geostress distribution during the fault creep process.The results show that:the fault creep may lead to a significant increase of stress in rock mass and the stress has a similar trend with the increase of depth;the stress in fault fracture zones is lower than that in the surrounding rocks on both sides in general;the fault creep can cause the development of a large number of cracks in rock mass,resulting in the discontinuity of stress distribution;the areas of stress concentration in fault fracture zones and the surrounding rocks on both sides show the same distribution at different depths.