ISSN 2319-5347, ISI Impact Factor: 0.763

VOLUME 06 NO. 02 JULY 2017:

Title:           Effect of Clay Blanket and Chimney Filter against Seepage Failure
Authors:     Md. Mahmud Sazzad, Md. Mainur Rahman
Abstract:   This paper presents the effect of clay blanket, vertical and inclined chimney filters on the phreatic line, variation of pore water pressure and seepage discharge through earth dam. Numerical analyses are conducted by SEEP/W. The results are presented for homogeneous and zoned type earth dam with clay blanket or chimney filters. Numerical results depict that earth dam with vertical and inclined chimney filter located at downstream side brings down the phreatic line within the dam body that reduces the piping and sloughing danger. Also the pore water pressure is minimum in case of downstream vertical chimney filter that reduces the possibility of blowout at downstream toe. However, the seepage discharge is greater in magnitude in case with vertical and inclined chimney filter at downstream side that increases the piping danger. In case of upstream and downstream clay blanket, seepage discharge is much lower but pore water pressure is higher than downstream vertical and inclined chimney filter and is more susceptible to blowout failure at downstream toe. Seepage discharge is found to be minimum for dam provided with internal clay core only.

Keywords: Clay Blanket, Chimney Filter, Seepage Failure, Pore water pressure
Pages:        77-83

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