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| Prediction and Verification Analysis of Water Inflow for Daiyunslian Tunnel |
| YIN Shi - qing |
| (China Railway Siyuan Survey and Design Group Co. Ltd，Wuhan, Hubei 430063 , China) |
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Abstract Abstract ： Research purposes ： Daiyunshan tunnel is one of the high risk tunnels on Xiangtang - Putian Railway，and the correct prediction of water inflow^ is crucial to the tunnel design and construction. A kind of water inflow prediction method, which feathers for searching fissure water from steep dip angle in hard blocky rock tunnel with deep buried, has been developed on detailed comparison between site observed water inflow and the estimation water inflow that calculated by various methods during investigation stage. Research conclusions:( 1 ) The actual water inflow of Daiyunshan tunnel during construction corresponds with the predicted water inflow, which was obtained by using the water inflow calculation formula for partially penetrated well in steeply dipping phreatic aquifer from groundwater dynamics. This method has a prediction precision of 98.6%，and the ration of the sum of every water exits to the maximum water inflow predicted in the tunnel is 1.61. (2) The reason why the actual observed maximum water inflowexceeds the prediction value is that the most water inflow in initial stage is mainly from cracks, porosity and other static water. (3) The actual distribution of water gushing point has large different from investigation report. Hence，the high pressure fractured water，which stored in the vicinity of the secondary faults， plumose tension fissure around the compressional torsion fracture，should be paid attention to. (4)The research results can provide references for deep buried tunnel engineering investigation projects which feature for steep dip structural fissure water with hard rocky in railway, highway and hydro industries.
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Received: 09 October 2015
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2015, Vol. 32 
