The Construction And Quality Control Of Concrete Cut-off Wall Of Dam At Yele Hydropower Station

The development process of concrete cut off wall is firstly stated in brief in this paper, and the general engineering situation of Yele Hydropower Station is immediately described, such as the Hinge situation, engineering geology, engineering hydrology, local weather, the engineering design of Seepage Control System of dam foundation, etc. The emphasis of the paper is put on the method of the construction quality control of concrete cut off wall, the layout of Seepage control system, the experimental research and matching ratio to the raw and processed materials of concrete cut off wall, and the detailed situation of spot construction of concrete cut off wall (including methods of construction, the layout of construction flat and the temporary' building system, the partition of slot and the mode of the tie-in, the disposal to the extraordinary situation during the construction of the concrete cut off wall, and the quality of continuous concrete cut off wall.) It settles the quality control problems of slope of deep slot and tie-in quality of cut off wall. And it breaks through the demand of existing construction criterion of concrete cut off wall, which provides a sufficient basis for the draft of the construction technical specification and its ration of concrete cut off wall, and in the same time accumulates the experiences about construction of concrete cut off wall in the cavity. The paper also brings forward the researching of impaction to the concrete arch of cavity that is made by the construction of upper slot of concrete cut off wall, and gives a comprehensive evaluation to the quality of continuous concrete cut off wall entity which is combined with other information, such as the quality of mode of hole, the quality of concrete at the mixer, core sampling, water testing, etc., At last, according to the existing information of construction some other problems are put forward, which need to be researched for the future construction of curtain grouting in the deep overlay.