地壳岩石压剪断裂核形态探讨

DISCUSSION ON FORM OF ROCK COMPRESSION AND SHEAR FRACTURE NUCLEUS OF EARTH'S CRUST

给出了当KⅠ<0时KⅠ,KⅡ,KⅢ地壳岩石压剪断裂核的形状方程;分析了KⅠ,KⅡ叶状压剪断裂核和KⅠ,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。

The shape equation of KⅠ, KⅡ, KⅢ for rock compression and shear fracture nucleus of the earth＇s crust,when the coefficient KⅠ is less than 0, is given. The shape and character of KⅠ, KⅡ for compression and shearfracture nucleus with the shape of leaf, and KⅠ, 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 earth＇s crust is discussed, and it is verified by in-situ findings of geological investigation.