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| The Cause Analysis and Treatment Ideas for Sand Boil Disease of a Railway Tunnel |
| FU Kai-long1, YI Xiao-juan2 |
| China Railway Eryuan Engineering Group Co. Ltd, Chengdu, Sichuan 610031, China |
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Abstract Research purposes: A railway tunnel located in the karst region of southwest China, there were not any abnormal situation in the construction process, but in the first and third years after operation，the tunnel encountered halting of the driving because of track bed burying by sand boil. To treat the sand boil effectively and completely, the paper discusses the cause of the sand boil and the treatment idea by the aspects of researching the sand inflow process, searching the circumstance of the karst in the region of the sand boil, adding hydro geological mapping around the tunnel, analyzing the karst and karst water environment in detail, discussing the reason of the sand inflow with rainfall. Research conclusions: After extreme rainstorms infiltration passing through karst fissure and conduit in rainy season, the ground water table rise to above the top of tunnel and the sand boil in the karst fractures carrying by pressuring ground water flow into tunnel and form sand boil; the similar tunnel located in seasonal variation belts of karst water with the ground water table rising encounter sand inflow under the condition of existing a lot of karst fractures and filling with silt, so this paper recommend the plan of drainage hole that can reduce ground water table of the tunnel effectively after rainstorm and be maintained easily; The research findings can be as a reference of the geological survey and design personnel for railway and highway tunnel construction.
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Received: 05 September 2013
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2014, Vol. 31 
