中间主应力对共轭平移断层中各序次应力场和断裂等构造形迹相互关系的影响  

INFLUENCE OF INTERMEDIATE PRINCIPAL STRESS ON MUTUAL RELATION OF DIFFERENT-ORDER STRESS FIELDS AND FAULT STRUCTURE TRACKS IN CONJUGATE STRIKE-SLIP FAULTING

作　　者：周小平[1] 郭映忠[1] 张永兴[1] 

机构地区：[1]重庆大学土木工程学院,重庆400045

出　　处：《地质科学》2005年第3期319-327,共9页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：国家自然科学基金项目(批准号:59879012;59649008);国家"十五"科技攻关项目(项目编号:2001BA604A02)资助。

摘　　要：从数学力学的角度定量分析了考虑中间主应力的影响时各类构造结构面之间的空间组合规律,并推导出相关的公式。首次提出了考虑中间主应力的影响时在预测或预报对区域稳定性或岩体稳定性具有重大影响的断裂构造的产状要素和派生构造应力场的方位和大小的方法。计算结果表明:中间主应力对构造结构面之间的空间组合规律具有重要影响。The Mohr-Coulomb strength criterion did not take effect of intermediate principal stress on yield and failure of rock into account so as to result in a disparity between results obtained by using Mohr-Coulomb strength criterion and those from experimental data. In this paper, the mechanical analysis of influence of intermediate principal stress on the spatial combination regularities of different kinds of structure planes was made, and some related formulae were de- rived. Based on the mentioned-above, the paper proposed a method to forecast and predict elements of the faults occurrence affecting the regional stability or rock masses stability, the orientation and amplitude of the derived tectonic stress field, then obtained a close form solution for mutual relation of different-order stress fields and fault structure tracks in conjugate strike-slip faulting. The numerical results showed that the intermediate principal stress weightily affected the spatial combination regularities of different kinds of structure planes.

关 键 词：中间主应力 定量分析 空间组合规律 岩体稳定性 区域稳定性 构造应力场 

分 类 号：P642.3[天文地球—工程地质学]