2005, Volume 7, Issue 3
Strategic Study of CAE >> 2005, Volume 7, Issue 3
Treatment of Highly Weathered Rock Mass at the Abutment of Earth-Rock Dam in Qiaoqi Hydropower Project
Chengdu Hydroelectric Investgation & Design Institute of State Power Corporation , Chengdu 610072 , China
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Abstract
The abutment is the part where the by-pass seepage and contact erosion often happen to make the dam not work normally, which is the key point during design and construction, so Design Specifications for Rolled Earth-Rock Fill Dams (SL274-2001) require excavating into the slightly weathered rock mass for the core wall and the reversed filter and the abutment. The spreading gradation earth-rock fill dam with crushed-stone-earth core wall is 123m high, and the highly weathering natural depth of the phyllite and sandstone at abutments on both bank is 14.6～66.4m. According to the Specification, the excavation quantity is enormous. It is practically excavated into the highly weathering zone, which can not meet with the Specification. The treatment scheme for the highly weathering rock mass on both abutments and grouting tests and grouting technics are introduced in detail. The feasibility to adopt consolidation grouting and seepage treatment measures is argued and the treatment measures and construction control standards are proposed.
Keywords
Qiaoqi Hydropower Station ; earth-rock dam ; treatment of abutment ; highly weathered rock mass ; consolidation grouting ; curtain grouting
Figures
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References
[ 1 ] SL274一2001碾压式土石坝设计规范[S].北京;中国水利水电出版社,2002
[ 2 ] DL/T5148一2001水工建筑物水泥灌浆施工技术规范[S].北京:中国电力出版社,2002
[ 3 ] 林春.碾压式土石坝设计[M].郑州:黄河水利出版社,2003
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