岩石圈流变机制的确定及影响岩石圈流变强度的因素

The Determination of Rheological Mechanics of Lithosphere and the Influencing Factors on the Rheological Strength of Lithosphere

讨论了确定岩石圈流变强度中存在的问题 .根据Byerlee定律 ,给出了在Anderson断层系统下三种断层的摩擦滑动强度公式 .利用小标本岩石实验结果外推 ,用大标本实验结果作约束 ,得到岩石圈几种典型岩石的脆性破裂规律 .利用上述结果和传统的方法 ,分别得到了鄂尔多斯和山西裂谷两个典型地区的流变强度随深度的变化 .结果表明 ,以往的计算对岩石圈流变强度的估计过高 ,对脆性形变区估计不足 ,流变机制估计不对 ;岩石圈有力学分层的特性 ,但各地分层的深度范围不同 ,使得成层和力学作用变得复杂 .讨论了水、应变率以及多相矿物对流变强度的影响 .

We studied transitions of rheological mechanics and their application in rheology of lithosphere. The formulas of friction for three types of fault under Anderson faults systems was gained based on Byerlee law; the rule and parameters of brittle fracture of typical rocks in lithosphere has been gained by comparing and analyzing many results of experiments; these results were applied to lithosphere of Huabei and the strengths of Eerduosi area and Shanxi rift has been attained; The results show that previous studies had higher deviation of strength; the lithosphere possesses stratified character of mechanics, but because depth of layers are not same in different sites, these layers and mechanics action will become more complex. Finally we discussed influence of water, stain rate and polyphase rocks on strength.