Abstract:

In order to conquer F11 highpressure and waterrich fractured fault of Qiyueshan tunnel on YichangWanzhou railway, continuous innovations are made to the grouting design, grouting completion standard and execution concept on basis of the conventional pregrouting theory and the geological conditions. "Probing + grouting" mode, accurate tracing grouting design and combination of grouting and supporting are presented in detail. The importance of standard management and control of the borehole drilling, grouting and effect evaluation is emphasized. In the end, the grouting quantity is reduced, the grouting effect is guaranteed and the execution efficiency is improved. The paper can be served as reference for the design and execution of grouting in similar geological conditions in the future.

Key words: highpressure and , waterrich, fault, grouting design, construction technology