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| Technology for Blocking Water by Grouting for High - pressure Cranny Water of Qiyueshan Tunnel |
| ZHANG Min-qing, HUANG Hong-jian |
| Yichang-Wanzhou Railway Construction Headquarters of the Railway Ministry, Enshi, Hubei 445000, China |
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Abstract Research purposes：The strata of the Qiyueshan tunnel exit at PDK 366+ 295 - + 155 and the main tunnel at DK 366+ 296 - + 148 are the strata with the medium thickness seam quartz sandstone, and the stratum of vertical interval 3-10m of the tunnel in long itudinal direction is 20-90 cm thick shale rock and shed coal interlayer. The water in flow from the one exploration bore is 10 - 500 m3/h, with the water pressure of 2.1 - 3.2 MPa. The study and analysis of using which kind of grouting liquid to block the high - pressure canny water are made for achieving good result of water blocking and the grouting material and liquid are presented for ensuring safe excavation of the tunnel.
Research conclusions：The practices of 9 whirligigs to the parallel pilot tunnel and the 5 whirligigs to the main tunnel show the good result of water blocking with the amount of water seeping of 4.9 L/m per minute is achieved by adopting the single liquid slurry of Portland cement and double liquid slurry of Portland cement and water-glass to block the high pressure cranny water. If the tunnel section is not big ( e.g. the parallel pilot tunnel), the surrounding grouting can be adopted for blocking water and the water blocking range covers 3-5 meters outside of the tunnel. If the tunnel section is big ( e.g. the main tunnel), the water blocking range covers 5-8 moutside of the tunnel.
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Received: 15 July 2009
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2010, Vol. 27 
