地壳岩石压剪断裂核形态探讨.pdfVIP

第24 卷 第16 期 岩石力学与工程学报 Vol.24 No.16 2005 年8 月 Chinese Journal of Rock Mechanics and Engineering Aug .，2005 地壳岩石压剪断裂核形态探讨 周群力，刘振洪，刘 樵，王良之 (湖南省水利水电勘测设计研究院，湖南 长沙 410007) 摘要：给出了当K Ⅰ＜0 时K Ⅰ，K Ⅱ，KⅢ地壳岩石压剪断裂核的形状方程；分析了K Ⅰ，K Ⅱ叶状压剪断裂核和K Ⅰ， KⅢ花蕾状压扭断裂核的形状与性状并介绍了岩石压扭直剪断裂试验和大理岩试件的破坏状况。在压剪断裂试件临 破坏前切口区域的微观照片中可见岩石破碎情况，与理论分析相符。探讨了地壳岩石压剪断裂核的延深长度，并 借矿床地质调查的成果加以实证。 关键词：岩石力学；岩石压剪断裂；压剪断裂核；压扭断裂核；岩石压扭直剪断裂试验 中图分类号：TU 459 文献标识码：A 文章编号：1000 –6915(2005)16 –2906 –06 DISCUSSION ON FORM OF ROCK COMPRESSION AND SHEAR FRACTURE NUCLEUS OF EARTH′S CRUST ZHOU Qun-li ，LIU Zhen-hong ，LIU Qiao ，WANG Liang-zhi (Hunan Hydro and Power Design Institute ，Changsha 410007 ，China) Abstract ：The shape equation of K Ⅰ，K Ⅱ，KⅢ for rock compression and shear fracture nucleus of the earth′s crust， when the coefficient K Ⅰ is less than 0 ，is given. The shape and character of K Ⅰ，K Ⅱ for compression and shear fracture nucleus with the shape of leaf，and K Ⅰ，KⅢ for compression and torsion fracture nucleus with the shape of bud are analyzed. Compression and torsion of direct shear fracture test and rupture state of marble samples are introduced. The rock rupture state can be seen in the microcosmic photo of the notched area of compression and shear fracture samples before failure. The results agree well with the theoretic analytic results. The extension length of rock compression and shear fracture nucleus of the earths crust is discussed ，and it is verified by in-situ findings of geological investigation. Key words ：rock mechanics ；compression and shear fracture of rock ；compression and shear fracture nucleus； compression and torsion fracture nucleus；direct shear fracture test of rock compression and