In the stage of compaction by initial damage, density damage increment of sandstone is positive and the rate ia positive.

在初始损伤的压密阶段，砂岩的密度损伤增量为正值，速率也为正；

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In the stage of compaction by initial damage, density damage increment of sandstone is positive and the rate ia positive.

在初始损伤的压密阶段，砂岩的密度损伤增量为正值，速率也为正；

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