12 : With the increasing axial stress, the gangue of different grain sizes began to be gradually compacted, resulting in the lateral deformation of the specimen showed a trend of gradual expansion around.
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Study on the macro-micro evolution of compaction characteristics of coal gangue with different grain sizes under side-limit compression conditions.
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The sentences
When the axial pressure reaches a certain threshold, with the increase of particle size, the deformation shows an increasing trend.