浙江江山古构造应力场研究

ON THE PALAEOTECTONIC STRESS FIELD IN JIANGSHAN REGION, ZHEJIANG PROVINCE

本文通过合理布设节理观测点,对各节理点的节理进行系统的观测和统计,并利用电子计算机进行多种分期和配套,确定出江山地区五期主要构造运动的主应力轴产状。结合该区的构造特征,采用有限单元法对各期古构造应力场进行数学模拟。并对不同构造运动时期古构造应力场的变化情况,进行了比较。了解了同一构造运动时期不同地段应力状态的变化规律和应力相对集中区,较好地解释了区内主要地质构退的形成和展布规律。

This Paper, on the basis of the reasonable assignment of joint observation points, the joints in every point are systematically observed and counted. With the help of computer, the joints are timed (geologically) and put into complete sets, thus the principal axes of stress of five main tectonic movements in jiangshan region are determined. Along With the characteristics of structures in the region, the palaeotectonic stress fields in different periods are mathematically imitated according to the finite element method, the varieties of palaeotectonic stress fields in different periods of tectonic movement are compared and the variety law of stress states at different locations amd relative stress concentration area in the same tectonic movememt are recognized. Lastly, the formation and distribution laws of main geological structures in the region are better interpreted.