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本文从基本的地质构造现象和地震活动特点出发,用平面应力问题的有限元模拟方法对我国活动性强、地震频度高、强度大的鲜水河断裂带的应力作用方式及区域应力场进行分析探讨。实验分两步,先采用全弹性体,然后结合弹塑性体进行模拟,互相对比印证。实验力求得到最佳结果和符合该区实际的解,有较充分的说服力和对比依据。结果在肯定印度板块对该断裂带形成的重要影响外,着重指出大陆东部板块不可忽视的作用。断裂带以东区域在东部板块的推动下向北西西方运动,与印度板块巨大推动的强制性限制,二者作用不均衡(失衡)而在特定部位产生剪切滑动,这可能才是该断裂带形成、强烈左旋错动以及频繁活动的主因。
Based on the basic geologic structure and the characteristics of seismic activity, this paper uses the finite element method of plane stress problem to study the stress mode and the regional stress field of Xianshuihe fault zone with high activity, high seismicity and high strength in China Analysis and discussion. The experiment is divided into two steps, first using the whole elastomer, and then simulating it in combination with elastomers to confirm each other. Experiments to achieve the best results and meet the actual solution in the region, there is more convincing and comparative basis. As a result, while affirming the important influence of the Indian plate on the formation of the fault zone, the paper points out that the eastern plate can not be neglected. The east of the fault zone moves northwest and west with the impetus of the east plate and compulsory limit of great push by the Indian plate. Both of them are in an unbalanced (imbalanced) role and cause shear slippage at a specific site, which may be the fault zone Formation, a strong left-handed movements and the main cause of frequent activities.