Study On The Properties Of Soil-concrete Cut-off Wall And Its Application In Sichuan Wudu Diversion Cofferdam Project

Concrete cut-offer wall is an effective treatment of dam foundation seepage and engineering base. It is the underground continuous seepage wall pouring concrete in the mud or backfilling other impervious materials, which is on the loose pervious foundation or dam (weir) to form continuous pores in the slot with solid mud wall. Along with the development of science technology, its construction process and impervious material have greatly been improved. As the soil-concrete has various compositions, complex soil-concrete mix and rigorous quality of construction, all of these lead to the cost to go up.Firstly this paper introduced the development of concrete cut-offer wall construction technology at home and abroad at present, several wall materials and their characteristics. Combined the Wudu reservoir cofferdam projects, cut-offer wall with the characteristic of plastic concrete is studied by theory and experiment, including the mud used in construction of concrete cut-offer, the materials used in construction, the construction technology of concrete cut-off wall (the layout of construction platform, the arrangement of temporary system, the division of slot, the joint pore forming construction, the quality control, the solution of abnormal condition, etc). According to the actual situation of engineering, the suitable mix ratio is designed and applied in the engineering. Finally, based on the construction, it is evaluated comprehensively to meet the anti-seepage requirements and achieve good effects. The next deep curtain grouting construction is cancelled to save the project investment. Results have been successfully applied in Wudu Reservoir cofferdam projects. The results can be used for reference for the strengthening treatment of other dam impervious reinforcement, and can also be accumulated as the experience for study strengthening technique of the faulty and dangerous reservoirs.