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,如果地層是粘粒含量較少的卵石層、砂土地層、風(fēng)化巖地層,進(jìn)入壓力艙的土體就很難形成這種“塑性流動(dòng)狀態(tài)”,從而嚴(yán)重阻礙施工進(jìn)程甚至造成施工事故,閉塞就是常見(jiàn)的一種施工障礙,已經(jīng)引相關(guān)方面的重視。