Usu-ally m_f adopts 1.5 in practice (that is, under ideal condition, fracture porosity index m_f = 1, the porosity index of rock matrix m_b = 2, the average is adopted).

• 在实际的工作中通常取m_f=1.；5(即取理想情况下的裂缝孔隙度指数m_f=1与基质岩块的孔隙度指数m_b=2的算术平均值)。