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A Study on risk assessement approach of water inflow into a shaft in fractured rock mass

Motoshima, Takayuki*; Onoe, Hironori* ; Ijiri, Yuji*; Otsu, Hiroyasu*; Saegusa, Hiromitsu

Since water inflow into a tunnel significantly impacts construction costs and schedules, it is important to estimate the impact on these factors quantitatively based on prior information about hydrogeological properties. A simplified formula is proposed in order to estimate water inflow volume into tunnel and is validated through comparing the results of DFN model. This formula is able to calculate water inflow risk more quickly than DFN model. Monte Carlo simulation and sensitivity analysis about water inflow risk are performed by using this formula. Then relationships between water inflow risk and amount of information about fracture properties are obtained based on the sensitivity analysis.

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