Dynamic compaction is a kind of deepcompaction, it is a kind of method that tens tons of heavy hammers from tens of metres to consolidate soil.
强夯法是深层密实法的一种，是一种将几十吨的重锤，从几十米的高空落下，对土进行强力夯击的方法。
2
The formation of arch effects will bring the sand filling over the region of deep concavity hindered and the degree of compaction of molding sand at the deep concavity reduced.
它的形成会阻碍型砂向深凹区的填充，使得深凹处砂型紧实度降低。
3
Future research needs to study the dynamics of the compaction problem to determine how frequent moldboard or deep tillage is needed.