The result of analysis shows that the travel time of the refracted arrival of the longitudinal wave has a linear relationship with porosity over a fairly broad range, it has nothing to do with the variations of frequencies and coefficient of permeability.

• 结果表明:滑行纵波(第一类纵波)的声波时差与孔隙度在相当宽的范围里有近线性的对应关系而与频率和渗透系数的变化几乎无关;