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New progress on anchorage techniques in rock-soil

HAN Jun,DING Xiu li,ZHU Jie bing (Yangtze River Scientific Research Institute,Wuhan 430010,China)  
The new progresses on anchorage techniques of rock soil are expounded in the paper.The working characteristics and applied effects of single hole composite anchorage system and repeatedly high pressure grouting anchor bar are analyzed.The application of heavy load anchor bar in the hydro engineering is introduced
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