There are only elastic deformation and brittle deformation on the process of hydraulic fracturing, and not compaction.
水力劈裂过程只有弹性变形和脆性破坏，不存在裂隙压裂过程中的第三种变形机理—压缩破坏。
The process and mechanism of sand compaction are elucidated.
阐述了其实砂过程及实砂机理。
Finally, it compares two different compaction process of graded broken stone, it also compares the compaction quality of different graded broken stone in the same compaction process.
最后对级配碎石进行了两种不同压实工艺的比较，并对同种压实工艺下不同级配碎石的压实质量进行了比较。
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