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基于沉积岩特征，在显微镜下对陆源碎屑岩的成分、碎屑颗粒粒径、胶结作用和胶结类型等进行定量统计，建立了微观结构与宏观力学性质之间的定量关系，认为碎屑岩中随着粒径大于 ０． ０３ ｍｍ（或小于５φ）的碎屑颗粒含量的增加，岩石力学性质“包络线”上的值存在二次明显变化，表现为岩石力学性质跃变。同时，随着φ值的增大（或粒径减少），岩石力学性质包络线上的值逐渐增大到峰值强度和峰值刚度（粒径为２．５φ）。达到峰值后，随着φ值的增大，岩石力学性质逐渐降低，呈现“粒径软化”特性，最后产生残余流动。
Based on the characteristics of sedimentary rocks, the composition of terrigenous clastic rocks, granularity of clastic particles, cementation and cementation types were quantitatively analyzed under a microscope. The quantitative relationship between microstructure and macroscopic mechanical properties was established. It is considered that in the clastic rocks With particle size greater than 0. 03 mm (or less than 5)) of the debris content increases, the rock mechanical properties of the “envelope” there are two significant changes in the value of the performance of the rock mechanical properties of the transition. At the same time, as the value of φ increases (or the particle size decreases), the value of the rock mechanics envelope gradually increases to peak intensity and peak stiffness (particle size of 2.5φ). After reaching the peak value, with the increase of φ value, the mechanical properties of rock gradually decrease, presenting the characteristics of “particle size softening” and finally residual flow.