【摘要】 从两方面研究了弹性变形中孔隙度的变化情况。首先,借助于岩石的4个压缩系数及其相互关系,从理论上证明了孔隙度的变化与净围压有直接的关系,即若净围压不变,孔隙度也不会改变;反之,孔隙度将变化。另一方面,从实验角度用反证法证明了弹性变形中孔隙度是变化的,即先假设孔隙度不变,推导出岩石骨架颗粒压缩系数的表达式,再借助于实验数据将计算值与实测的岩石骨架颗粒压缩系数值对比,若两者相差特别大,则原假设就不成立。理论与实验计算结果都表明,在一般情况下,岩石在弹性变形过程中,孔隙度是变化的,孔隙度不变性原则并不成立,因而孔隙度校正是有依据的。更多还原

【Abstract】 The variation of porosity in elastic deformation of rock is studied in two aspects.Firsly,based on the four compressibility factors in rock and their relations among them,it is proved theoretically that the porosity variation is related closely with the net confining pressure,showing that if the net confining pressure is invariable,so is the porosity;otherwise,the porosity is variable.Secondly,the experimental data are used to testify that the porosity is variable in elastic deformation.Such a disproof method means that the formula for rock matrix compressibility factor at constant porosity is deduced followed by substituting the experimental data into the formula,comparing calculated value with measured value of the compressibility factors.If the difference of both values is extremely large,the former hypothesis is not valid,namely the porosity is variable.The results from the theoretical and experimental analyses indicate that the porosity is normally variable during elastic deformation of rock,hence porosity correction has the basis,whereas the principle of porosity invariability is not valid.更多还原