blockings造句

• As we know, when meeting these soils, many breakdown and danger will occur, such as the blockings, which has attracted attention of many construction personal on site . however, at present, there exist many unknown fields in blocking . firstly, the definition of blocking is not interpretative
  但是，如果地层是粘粒含量较少的卵石层、砂土地层、风化岩地层，进入压力舱的土体就很难形成这种“塑性流动状态”，从而严重阻碍施工进程甚至造成施工事故，闭塞就是常见的一种施工障碍，已经引相关方面的重视。