And the rock mass as the main object of most engineering practice is developed by all kinds of geotechnical action and force in the long geology history to the complex characteristic of continuous medium , crannied medium and granular medium , to the anisotropic and heterogeneous entity with elasticity , plasticity , viscidity , creepocity and rheology 作为主要工程对象的岩体是在漫长的地质历史发展过程中经受各种地质营力作用而形成的成因和构造复杂，岩性多样且包含了连续介质，裂隙介质和散体介质特征的，兼有弹性、塑性、粘性、流变性的各向异性的非均质地质体。
