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- Title
Research on Seepage Stabilization and Drainage Strategy of Foundation Pit Advance Drainage Cofferdams.
- Authors
WU Du-du; ZHAO Yin-chao; ZENG Wei; XIANG Jin-hu
- Abstract
Cofferdam seepage and slope stability are related to the stability of the cofferdam itself and whether the dry construction conditions can be formed in time, which greatly affects the construction period of the main building. Based on the cofferdam construction and foundation pit drainage of TB hydropower station in Lancang River, ABQUAS and SLIDE software were used to study the seepage stability of cofferdam body and slope stability under the condition of sudden drop of foundation pit water level in each construction stage of the cofferdam cut-off wall. The results show that: with the gradual completion of the construction of the cut-off wall, the stabilization time of the seepage line of weir body is gradually reduced, and the seepage line stabilization time is longer under the condition of greater water level difference between the inside and outside of the foundation pit ; under the condition that the construction of the phase 1 trench of the cut-off wall is completed and the phase 2 trench is in the process of slurry retaining wall, if the water level plunge in pit can be controlled to not exceed 0.9 m per process, the cofferdam slope can remain stable, and at this time the foundation pit can be allowed to advance drainage. based on the result, the strategy and program of advance drainage of tb hydropower station pit were studied. the results of the study can provide reference for similar projects.
- Subjects
DRAINAGE; WATER levels; SLOPE stability; RETAINING walls
- Publication
China Rural Water & Hydropower, 2024, Issue 5, p243
- ISSN
1007-2284
- Publication type
Article
- DOI
10.12396/znsd.231664