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Analyses of Hydrology and Groundwater Level Fluctuation in Granite Aquifer with Tunnel Excavation  

Chung, Sang-Yong (Department of Environmental Geosciences, Pukyong National University)
Kim, Byung-Woo (Department of Environmental Geosciences, Pukyong National University)
Kang, Dong-Hwan (Department of Environmental Geosciences, Pukyong National University)
Shim, Byoung-Ohan (Korean Institute of Geosciences and Mineral Resources)
Cheong, Sang-Won (Department of Science Education, Chungbuk National University)
Publication Information
The Journal of Engineering Geology / v.17, no.4, 2007 , pp. 643-653 More about this Journal
Abstract
Average hydraulic conductivity was $2.64{\times}10^{-8}m/sec$ average RQD was 78%, average porosity was 0.51%, and range of groundwater level was $77.06{\sim}125.97m$ by measured in 8 boreholes at the Surak Mt. tunnel area. Groundwater level of two peaks in the Surak Mt. tunnel area were estimated through linear regression analysis for groundwater level versus elevation. And, average horizontal hydraulic gradient in the Surak Mt. tunnel area was calculated 0.267. Minimum, maximum, and average hydraulic conductivities that estimated by field tests were $5.56{\times}10^{-9}m/sec,\;6.12{\times}10^{-8}m/sec,\;and\;2.64{\times}10^{-8}m/sec$, respectively. Groundwater discharge rates per 1 meter that estimated using minimum, maximum, and average hydraulic conductivities and average horizontal hydraulic gradient were $0.00585m^2/day,\;0.06434m^2/day,\;and\;0.02775m^2/day$, respectively. Pure groundwater recharge rate per unit recharge area was calculated 223.96 mm/yr through water balance analysis. Prediction simulation of groundwater level fluctuation with minimum, maximum, and average hydraulic conductivities were conducted. Discharge rate into the Surak Mt. tunnel for minimum hydraulic conductivity was small, but groundwaer drawdown was highly. Discharge rate into the Surak Mt. tunnel for maximum hydraulic conductivity was higher, but groundwaer level was recovered quickly.
Keywords
Granite; Tunnel excavation; Hydraulic conductivity; Hydraulic gradient; Groundwater discharge rate; Groundwater recharge rate; Groundwater level fluctuation prediction;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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