GPS Real-Time Supervisory System of Compaction Quality and Its Application in Shuibuya Dam

摘要

In the quality management of filling construction of face rockfill dam the quality control method of "dual controls" is mainly adopted,of which is manually controlling the parameters of compaction including thickness and roughness of filling layer and rolled speed and rolled times of compaction machines etc.,the other is inspecting the test hole sampled manually on site. The traditional manual management mechanism can' t meet the demands of modern mechanized construction and schedule any more,with increasing of scale of face rockfill dam.Concrete face rockfill dam of Shuibuya in Qingjiang River of Hubei province,China,is as high as 233 m. The project has a total filling volume of more than 1.5×107 m3 and more than 6×105m3 for peak filling volume of a single month.If a single test hole method is used,it is bound to bring series of problems such as large work quantity,low detection efficiency,limited sampling frequency,and large construction disturbance. At the same time,because artificial parameter method of monitor compaction is strongly subjective and of bad sampling representativeness,it is prone to inadequate even missing compaction and other quality problems. Therefore,the GPS real-time supervisory system of compaction quality in Shuibuya dam is developed using GPS,modern communications,computers,networks and other technologies,and solves the problem that compacted earth-rock dam which is lack of effective monitoring "construction process". The composition and applied characteristics of GPS system,and the key technical problems and solutions of design are described. The height accuracy of GPS system is analyzed and the application is introduced.