Methods for determining the physical and mechanical properties of coal and rock—Part 4:Methods for calculating the porosity of coal and rock
中国煤炭工业协会
GB/T 23561的本部分规定了煤和岩石孔隙率计算的术语和定义、煤和岩石总孔隙率（即包括开口与闭合两部分孔隙）计算、煤和岩石有效孔隙率（即开口孔隙率）计算方法。
本部分适用于煤和岩石孔隙率的计算，其中有效孔隙率计算适用于遇水不崩解且体积不发生变化的试件。
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