卸载时摩擦力的作用方向会发生改变，并抑制裂隙面之间滑移变形的恢复，使岩样内部产生残余变形。
In unloading process the direction of friction will convert to prevent restoration of shear deformation between the fissures, which results in the residual deformation in the specimen.
随着裂隙摩擦系数的增加，变形模量有逐渐增加的趋势。
The deformation moduli increase with increment of crack friction coefficient and decrease with increment of crack density parameter.
随着裂隙密度参数的增加，变形模量有减小的趋势；随着裂隙摩擦系数的增加，变形模量有逐渐增加的趋势。
For the deformation of fractured rock mass, crack density parameter and crack friction coefficient are the most important parameters.
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