在总结分析砾岩特点的基础上，简要介绍了包括CT扫描、图象分析、粒度统计、全直径分析等几种非常规孔隙度实验估测分析方法。
Based on analysing the gravel features, several non-conventional porosity laboratory prediction methods, such as ct scan, image analysis, grain statistics, full-diameter analysis, have been described.
合适颗粒直径的选择与孔隙率、压降和强度的要求有关。
The particle diameter selection then depends on the porosity, pressure drops, and plate strength.
试样的平均直径随着有效围压的增长而单调减小。在此，有效围压被定义为围压和孔隙水压之差。
The average diameter decreases monotonically with increasing effective confining pressure, which is defined as the difference between confining pressure and pore water pressure.
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