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| Research on the Technology of Single - pipe Drill Level Retrograde Grouting for Completely Decomposed Granite |
| WANG Quan-sheng，XIAO Hong-qu, LI Zhi-guo |
| Scientific Research Institute, China Railway Tunnel Group Co. Ltd, Luoyang, Henan 471009, China |
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Abstract Research purposes ； The site experiment is done on the single-tube drill pipe level retrograde - grouting technology for the purpose of overcoming the bad effect of the forward - stage grouting for the rich water completely decomposed granite because it easily softens, collapses and even flows away, resulting in the open collapse and difficult opening.
Research conclusions ： Single - tube drill pipe level retrograde grouting can obtain better grouting effect，but the grouting process and technical parameters should be controlled strictly. In order to obtain a better result of stopping water, it is proposed to use ultra - fine cement or solute grouting liquid.
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Received: 21 May 2008
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2008, Vol. 25 
