滇西北地区近年来应力场的数值模拟研究

建立滇西北地区三维有限元地质模型，将2009~2016年GPS速度场数据作为数值模拟的位移边界条件，模拟获取该地区的构造应力场。结果表明，在楚雄至滇西北地区整体显示张性应力区；出现由“洱源鹤庆断裂-红河断裂-程海断裂”圈起的低值张性区，区域内部张性应力明显低于外部，这种张应力低值区尤其在区域四周断裂边界处，往往是地壳断裂活动的频发区；曲江断裂北端及元谋-绿汁江断裂南端出现张性应力集中区，是今后重点关注的断裂结点。

The Numerical Simulation of Stress Field in Northwest Yunnan in Recent Years

In this paper, a three-dimensional finite element model is established for northwest Yunnan province. The tectonic stress field of the area is simulated by using 2009~2016 GPS velocity field data as the displacement boundary condition of numerical simulation. The results show that: Chuxiong to the northwest of Yunnan province shows overall tensional stress; in the area circled by Eryuan-Heqing, Honghe, Chenghai faults, the internal tensile stress is significantly lower than that of the outside; the low value area, especially around the boundary fault, is often in areas of frequent crustal faulting; the north of Qujiang fault and the south of Lüzhijiang fault present a tensional stress concentration zone, which will be focused on in the future.