糜棱岩形成过程的空洞损伤-局部低围压破碎机制  

Porosity-damage and local-low-ambient-pressure-crush mechanism in the formation of mylonite

作　　者：白嘉楠[1] 李和平[1] 胡宗军[1] 

机构地区：[1]合肥工业大学土木建筑工程学院,安徽合肥230009

出　　处：《合肥工业大学学报（自然科学版）》2002年第4期558-560,共3页Journal of Hefei University of Technology：Natural Science

摘　　要：提出一个糜棱岩形成过程中变形和破碎的新机制 :空洞损伤 -局部低围压破碎机制。认为原岩在糜棱化过程中经历了两个主要阶段 ,即由流动构造运动引起韧性的空洞损伤阶段和空洞损伤所形成的多孔介质受局部低围压效应影响发生的破碎阶段。使用有限元方法结合莫尔 -库仑破碎准则对这种多孔介质进行了破碎过程的数字模拟计算 。A new mechanism of deformation and crush in the formation of mylonite,porosity-damage and local-low-ambient-pressure-crush mechanism,is given in this paper. The former rock goes through two main periods in the course of mylonization: the period of tenacious porosity damage due to the flow construction motion and the period in which porous media formed by porosity damage are crushed by the local low ambient pressure. The finite element method and Mohr-Coulomb damage rule are used to calculate the porous media damage course. The result indicates that the damage of the porous media is completely possible.

关 键 词：形成过程 糜棱岩 多孔介质 围压效应 空洞损伤-局部低围压破碎机制 有限元 数值模拟 变形 

分 类 号：P588.332[天文地球—岩石学]