Construction of deep plastic concrete cut off wall in upstream coffer dam of Punatsangchhu-I Hydropower Project, Bhutan

DOI

10.2991/rare-16.2016.56How to use a DOI?

Keywords

abutment; foundation; coffer dam; plastic concrete; cut off wall; exploration

Abstract

Several examples of leakage through abutments and foundation of dams have been witnessed world over, but with the advent of modern technology and innovative approach, such problems are being tackled successfully. The piping and internal erosion within thick overburden in river valley was a major geotechnical issue for upstream coffer dam of Punatsangchhu-1 hydropower project, Bhutan. The plastic concrete cut off wall as diaphragm was designed and successfully installed as best option to encounter the water leakage through the dam body up to acceptable level. The key to the success was proper planning, thorough geological investigations by exploration, safe design, good workmanship and remedial measures adopted during construction for risk reduction. This paper highlights about delineation of bed rock profile by exploration and successful construction of 132m long and maximum 93m deep plastic concrete cut off wall, which is one of its own kinds and deepest diaphragm wall in the geologically complex Himalayan terrain

Copyright

© 2016, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - P.K. Gajbhiye
PY  - 2016/11
DA  - 2016/11
TI  - Construction of deep plastic concrete cut off wall in upstream coffer dam of Punatsangchhu-I Hydropower Project, Bhutan
BT  - Proceedings of the conference on Recent Advances in Rock Engineering (RARE 2016)
PB  - Atlantis Press
SP  - 353
EP  - 360
SN  - 2352-5401
UR  - https://doi.org/10.2991/rare-16.2016.56
DO  - 10.2991/rare-16.2016.56
ID  - Gajbhiye2016/11
ER  -