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| Prediction of Water-bursting Volume in Karst Tunnel under Different Geological Boundary Conditions |
| WU Zhi-sheng |
| The Fourth Survey and Design Institute of China Railways, Wuhan, Hubei 430063，China |
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Abstract Research purposes: At present, there are many methods in China of computing the water-bursting volume in karat tunnel. Although there are many methods, but they can rat completely meet the cannel design requirements far computing normal water-bursting volume and max. water-bursting volume with big gaps, so it is necessary to do the researches for the purposes of seeking new way. Research methods: A new method is obtained by adopting inversion derivation with long-term observed data about and surface spring water-bursting volumes in Naming Tunnel, a long shallow buried karat tunnel. Research results: The prediction method of big spring flow and curve inversion analysis method (new balance method) of water-bursting in tunnel are obtained through doing researches, and at the same time, many important hydrological and geological parameters and the ratios of water-bursting volumes in tunnel in different seasons are obtained with long-term observed data, including water-collection area，water-bursting volume in dry season, water-enriching volume for one unit length in dry season and the factor of rain penetrating into tunnel. Research Conclusions: The design and construction concepts on hydrological and geological parameters and sampling water-bursting volume should be changed, and the construction of karat tunnel should be evaluated with scientific development outlook.
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Received: 13 August 2007
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2007, Vol. 24 
