Rock Mesoscopic Structural Plane, Mesoscopic Anisotropy and Mesoscopic Anisotropy Index

In this article, we define rock structural planes caused by mineral orientation and layering distribution of some rock ingredients which is different from both rock mass scale structural planes and micro structural plane at crystal scale, as rock mesoscopic structural plane, and the rock anisotropy caused by the existence of these structural planes as rock mesoscopic anisotropy. Rock mesoscopic scale anisotropy index is introduced and its simple but efficient testing method is suggested. With the rock mesoscopic anisotropy index, the degree of rock mesoscopic anisotropy can be quantified easily and the process in simplified.