摘要
压力影是一种能够提供大量递进变形住信息的微构造.本文在北京周口店压力影构造的详细的显微分析和观察的基础上,利用二维弹塑性有限元方法对三种不同位态的压力影构造进行了计算机力学模拟.通过多次增量,在平面应变状态下计算压力影形成时应力和形变的分布特征,从而较为圆满地解决了压力影形成的三大问题:(1)影中矿物就位的空间:(2)影中矿物的物质来源:以及(3)压力影形成时核心矿物是否旋转.
According to the three-kinds of orientation of the central object in pressure shadows in Zhoukoudian, Beijing, three types of two-dimensional elasticoplastic finite element models have been constructed to simulate a rectangular object (e.g. pyrite)in an incompetent ground mass. The three models are first subjected to two kinds of differential pressure, and then deformed iteratively in order to gain a clear idea of the three basic problems concerning the formation of pressure shadows: retation of the central object, the forming of spaces infilled with shadow minerals, and the material origins of shadow minerals.
出处
《地质科技情报》
CAS
CSCD
北大核心
1990年第2期27-32,共6页
Geological Science and Technology Information
