Times and sequence of roll or ram compaction must be correct to ensure that earthcompaction degree meets the requirement.
碾压或夯实的遍数和顺序必须正确，以保证土方密实度符合要求。
2
The key link of embankment dam construction is fil ling and compacting of earth and rock materials and the compaction quality depends on whether the compacting standard is properly executed.
土石坝施工的核心是土石料的填筑压实，压实质量的好坏，关键在于能否正确执行压实标准。
3
The results show that the laser surface melting treatment improves greatly the homogenization, compaction and the corrosion resistance of rare earth permeating layer under the condition of test.