黄金口“T”型褶皱构造的力学分析

THE MECHANICAL ANALYSIS OF HUANGJINKOU T TYPE FOLD

对川东北黄金口构造特征进行了较详细的描述，并在此基础上对其早晚两期应力场作了讨论，用赤平投影方法和计算机解析计算了最大主应力、最小主应力、最大剪应力和主偏应力方向和大小。对岩石有限应变作了Ｆｒｙ法测量和分析，并用弹性力学有关曲薄板在轴向压缩下屈曲原理对黄金口构造形成力学机理进行了初步探讨。

This paper gives full details of structural characteristics of Huangjinkou in the north part of east Sichuan. On this basis, the paper discusses its early and late stress fields. The maximum principal stress, the minimum principal stress, the maximum shear stress and the principal deviatoric stress are calculated by using the methods of stereographic projection and computer analysis. According to Fry method, restricted strain of the rock is analysied and measured. In the light of the theory of elastic mechanics, that is, the theory that the inflected sheet will be buckled under axial compression, the author studies preliminarily the mechanics mechanism of the Huangjinkou structure.