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INVERSE PROBLEMS AND PREDICTION OF WATER INFLOW
IN TUNNELS OF JINPING II HYDROPOWER STATION |
| XIA Qiang1，2，WANG Xusheng1，POETER E2，WAN Li1 |
(1. School of Water Resources and Environment，China University of Geosciences，Beijing 100083，China；
2. International Ground Water Modeling Center，Colorado School of Mines，Golden 80401，USA) |
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Abstract Jinping II hydropower station is situated in a karst area with mountains and valleys. The excavation of large size tunnels will significantly change the conditions for groundwater flow，causing inflow in the tunnels and impacts on surrounding environment. As indicated by the discharge patterns of groundwater in the auxiliary tunnel during its construction，12 fractured zones with high vertical conductivity are existing in the Jinping mountain. Five three-dimensional stead state flow numerical models are built with MODFLOW. In the models，these fractured zones are typically considered. UCODE is employed to calibrate the models according to observations of groundwater inflow，and key parameters are identified and optimized for better modeling. Based on the waterproofing technique in the auxiliary tunnel，the models predict water inflows in all tunnels before and after waterproof protections，and the results are 40.35 and 31.19 m3/s，respectively. Excavation of the tunnels will causes drying of two major springs in the area，and the springs could not be recovered unless more effective waterproof protection is applied.
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Received: 16 December 2009
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MAO Yuting1, 2, HE Manchao1, 2, LIU Fangzhou3, BAI Xing4, YANG Xiaojie1, 2, TAO Zhigang1, 2*. Development and application of a large-scale physical model system for tunnel creep testing[J]. , 2026, 45(6): 1627-1638. |
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