Experimental investigation on the filtration of a novel composite plastic blind drainage on expansive soil slope

摘要

Extensive clogging occurs to the blind drainage due to the high clay content of the expansive soil slope and the distinctly different grain composition between the matrix and the sand cushion. Thus, a novel composite plastic blind drainage was designed and its seepage performance was explored by laboratory filter test. Compared to the conventional system, adopting the new plastic blind drainage significantly reduced the demand of sand and gravel for field application. The results from the laboratory tests revealed that, the seepage of the drainage system with this novel composite plastic blind drainage functioned steadily in the long-term.