| The concrete faced rockfill dam is regarded as an important type of dam in the hydraulic construction field because of some advantages such as: small, good safety and convenience of construction. It had a rapid development in china. It is widely used in all kinds of hydraulic electric projects, and lots of experiences of design theory, construction organization, project observation, maintenance and operation were accumulated.The Gongboxia Hydropewer Project is the fist Concrete Facing Rock-fill Dam in the Yellow River.In combination with the local geographical and geological conditions, the design and construction of the Gongboxia Concrete Face Rockfill Dam has many characteristics and gained good design and construction quality. These characteristics are as follows: a) the gravity high-toe walls with the height of 38.0m and 50.0 m were arranged in the two banks of the dam, which meets the needs of general layout of the key works; b) a strong pervious zone was arranged in the main rockfill area (3BI) to ensure the stability of anti-seepage of clam body; c) in combination of roller compaction test on the dam materials, the K30 method was adopted to test and study the filling quality of dam body; d)in the construction of the cushion slope, the crushing-type concrete side-wall construction method was adopted to replace the traditional construction technique, which not only can quicken the construction progress but also enhance the compaction quality of the slope of cushion material.Advanced experience in construction, especially dam base excavatingand treating, material making, quality method for dam filling and flattening, passing flood season method and construction of concrete face are summarized and discussed in this paper. Among them, some experience can be spreaded and widely used.The concrete crushing-type sidewall technology is the emphasis of this paper. It is a new method for constructing the upstream side-slope of concrete face rockfill dam. |
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