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1、GPS Real-Time Supervisory System and Application in the Construction of Face Rockfill DamHUANG Sheng xiang LIU Jingnan ZENG HuaienABSTRACT According to the quality control needs of filling construction of the face rockfill dam, by means o f the global satellite positioning technology , the wireless
2、data communication technology, the computer technology and the data processing and analysis technology, and integrating with the roller compaction machine, the GPS real-time supervisory system is developed in this paper. It can be used to real-timely supervise the construction quality of the roller
3、compaction for filling engineering. The composition and applied characteristics of GPS system, and the key technique problem and solution of the design are discussed. The height accuracy of GPS system is analyzed and the preliminary application is introduced.KEY WORDS ：GPS; filling construction; qua
4、lity control; integrated system; face rockfill damIntroductionAt present , in the quality management of filling construction of the face rockfill dam，the quality control method of “dual controls”is mainly adopted, of which one is manually controling the parameters of roller compaction including thic
5、kness and roughness of filling layer and rolled times and rolled speed o f compaction machines,the other is inspecting the test hole sampling manually in the area. The method play a positive role in promoting domestic development of concrete faced rockfill dam. How ever, the traditional manual manag
6、ement mechanism cant meet the demands of mo- dern mechanized construction and schedule anymore, with increasing of scale of con- crete face rockfill dam. Concrete faced rockfill dam of Shuibuya project in Qing jiang River of Hubei Province, China,ranking first in dam height of the same type in the w
7、orld, is as high as 233 m. The project has a total filling volume of 1. 6 107 m3 and more than 6105 m3 for peak filling volume of a single month, so demands much more to control the quality of filling construction of the dam. For the sake of supervising the filling construction quality quickly in ti
8、me, it is very important to develop a supervisory system of the construction quality of the roller compaction for filling engineering, which has characteristics of real-time, continuity , automation andhigh precision. T he supervisory system has a great meaning for improving the const- ruction quali
9、ty of Shuibuya project .As a brand-new technology of modern spatial satellites navigation and position- ing system,GPS has g radually replaced the normal optical and electrical surveying equipment in more and more fields. Since 1980s, especially after 1990s,GPS techno- logy has lead the spatial posi
10、tioning technology , combining with modern communi- cation technology，to a revolutionary change. The method for simultaneously determ- ineing three dimensional coordinates by GPS has changed the traditional positioning technology from land with inshore to entire ocean and outer space, from statics t
11、o kinematics, from point positioning to network difference, from afterwards processing to real-time positioning and navigation, and absolute and relative positioning prcisi- on coming to meter level, centimeter level, even submillimeter level, therefore, expands the fields of application and effect
12、in every walk of life. The fast development and improvement of modern data communication technology, computer technology, electrical technology and the spatial positioning technology on behalf of GPS make supervision of high precision real-time continuity and automation feasible.According to the req
13、uirements o f construction quality management for roller compaction in filling engineering, by means of the global satellite positioning technology, the wireless data communication technology, the computer technologyand the data processing and analysis technology,and integrating with the roller comp
14、- action machine, in 2004 Wuhan University and Qing jiang Hydroelectric Develop- ment Corp. Ltd. Jointly developed a real-time supervisory system suitable for the quality management needs of roller compaction in filling engineering, i. e. real-timesupervisory system of filling construction quality(
15、GPS system for short afterwards) . The system has comprehensive functions of real-time, high precision, continuity, automation etc. , so can be applied to real-time supervising construction quality of filling compaction for dam, road, protection dike, airport etc. and becomes an effective assistant
16、of ensuring the construction quality for project . Combining with engineering needs and system characteristics, the composition, key techniques and schemes of the system are discussed in this paper. The height accuracy of the system is analyzed and the preliminary application is introduced.1 Composition and characteristics of GPS Real-time supervisory system1. 1 Composition of the systemHardware unit of the system mainly includes 3 parts as follows:1) Receiving system of GPS sate
