Effects of the Excavation of a Hydraulic Tunnel on Groundwater at the Wuyue Pumped Storage Power Station
The tailwater tunnel of the Wuyue pumped storage power station is located in bedrock and extends to depths between tens and hundreds of meters. It is impossible to analyze and evaluate the whole engineering area from geological exploration data, and the hydrogeological conditions are complicated. In...
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MDPI AG
2023-04-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/13/8/5196 |
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| author | Tong Jiang Xun Pei Wenxue Wang Longfei Li Shihao Guo |
| author_facet | Tong Jiang Xun Pei Wenxue Wang Longfei Li Shihao Guo |
| author_sort | Tong Jiang |
| collection | DOAJ |
| description | The tailwater tunnel of the Wuyue pumped storage power station is located in bedrock and extends to depths between tens and hundreds of meters. It is impossible to analyze and evaluate the whole engineering area from geological exploration data, and the hydrogeological conditions are complicated. In the early stages of the tailwater tunnel’s construction, the drinking water wells in four villages dried up. This paper reports the results from a field investigation, in situ tests, laboratory tests, and numerical simulation carried out to determine how the groundwater was affected when the tunnel was excavated. A hydrogeological model of the region was established from the inverted regional natural flow field parameters. The model was validated, and an analysis of the errors showed that there was an average error of 1.98% between the natural flow field and the hydrogeological survey flow field. The model was then used to simulate the three-dimensional transient seepage fields under normal seepage conditions and limited seepage conditions, as far as was practical. The results showed that, as the excavation of the tailwater tunnel advanced, the water inflow to the tunnel also increased. When the water inflow increased from 1000 to 5000 m<sup>3</sup>/d, the water level at a distance of 100 m from the axis of the tunnel dropped from −0.956 to −1.604 m. We then analyzed how the water level changed as the water inflow varied and proposed a formula for calculating the extent of the influence on the groundwater. We studied how the water level changed at different well points to ascertain how a groundwater well became depleted and determined the factors that influenced seepage in the regional flow field. The water level in different areas of the project area was simulated and analyzed, and the extent of the groundwater area affected by the tunnel construction was clarified. We then studied how the groundwater in different areas of, and distances from, the project area was influenced by normal seepage conditions and limited seepage conditions and proposed a formula for calculating the extent of the influence on groundwater for different water inflows. We constructed a ‘smart site’ for visualizing data, sharing information, and managing the project. Time–frequency domain analysis was applied to explore the extent of the impacts and range of the vibration effects on residential housing at different distances from the project area caused by the different methods for excavating the tailwater tunnel. The results from this analysis will provide useful insights into how the excavation of this tailwater tunnel will impact the local residents and living areas. |
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| institution | Directory Open Access Journal |
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| language | English |
| last_indexed | 2024-03-11T05:16:30Z |
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| spelling | doaj.art-f5839310e8c04fbeaa4b56cbeed5b0682023-11-17T18:14:57ZengMDPI AGApplied Sciences2076-34172023-04-01138519610.3390/app13085196Effects of the Excavation of a Hydraulic Tunnel on Groundwater at the Wuyue Pumped Storage Power StationTong Jiang0Xun Pei1Wenxue Wang2Longfei Li3Shihao Guo4Henan Joint International Research Laboratory of Collapse-Landslide-Debris Flow Monitoring and Early Warning, North China University of Water Resources and Electric Power, Zhengzhou 450046, ChinaCollege of Geosciences and Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450046, ChinaHenan Key Laboratory Rock & Soil Mech & Struct Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450046, ChinaCollege of Geosciences and Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450046, ChinaCollege of Geosciences and Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450046, ChinaThe tailwater tunnel of the Wuyue pumped storage power station is located in bedrock and extends to depths between tens and hundreds of meters. It is impossible to analyze and evaluate the whole engineering area from geological exploration data, and the hydrogeological conditions are complicated. In the early stages of the tailwater tunnel’s construction, the drinking water wells in four villages dried up. This paper reports the results from a field investigation, in situ tests, laboratory tests, and numerical simulation carried out to determine how the groundwater was affected when the tunnel was excavated. A hydrogeological model of the region was established from the inverted regional natural flow field parameters. The model was validated, and an analysis of the errors showed that there was an average error of 1.98% between the natural flow field and the hydrogeological survey flow field. The model was then used to simulate the three-dimensional transient seepage fields under normal seepage conditions and limited seepage conditions, as far as was practical. The results showed that, as the excavation of the tailwater tunnel advanced, the water inflow to the tunnel also increased. When the water inflow increased from 1000 to 5000 m<sup>3</sup>/d, the water level at a distance of 100 m from the axis of the tunnel dropped from −0.956 to −1.604 m. We then analyzed how the water level changed as the water inflow varied and proposed a formula for calculating the extent of the influence on the groundwater. We studied how the water level changed at different well points to ascertain how a groundwater well became depleted and determined the factors that influenced seepage in the regional flow field. The water level in different areas of the project area was simulated and analyzed, and the extent of the groundwater area affected by the tunnel construction was clarified. We then studied how the groundwater in different areas of, and distances from, the project area was influenced by normal seepage conditions and limited seepage conditions and proposed a formula for calculating the extent of the influence on groundwater for different water inflows. We constructed a ‘smart site’ for visualizing data, sharing information, and managing the project. Time–frequency domain analysis was applied to explore the extent of the impacts and range of the vibration effects on residential housing at different distances from the project area caused by the different methods for excavating the tailwater tunnel. The results from this analysis will provide useful insights into how the excavation of this tailwater tunnel will impact the local residents and living areas.https://www.mdpi.com/2076-3417/13/8/5196pumped storageWuyue Reservoirtransient numerical simulationparameter inversionseepage field |
| spellingShingle | Tong Jiang Xun Pei Wenxue Wang Longfei Li Shihao Guo Effects of the Excavation of a Hydraulic Tunnel on Groundwater at the Wuyue Pumped Storage Power Station Applied Sciences pumped storage Wuyue Reservoir transient numerical simulation parameter inversion seepage field |
| title | Effects of the Excavation of a Hydraulic Tunnel on Groundwater at the Wuyue Pumped Storage Power Station |
| title_full | Effects of the Excavation of a Hydraulic Tunnel on Groundwater at the Wuyue Pumped Storage Power Station |
| title_fullStr | Effects of the Excavation of a Hydraulic Tunnel on Groundwater at the Wuyue Pumped Storage Power Station |
| title_full_unstemmed | Effects of the Excavation of a Hydraulic Tunnel on Groundwater at the Wuyue Pumped Storage Power Station |
| title_short | Effects of the Excavation of a Hydraulic Tunnel on Groundwater at the Wuyue Pumped Storage Power Station |
| title_sort | effects of the excavation of a hydraulic tunnel on groundwater at the wuyue pumped storage power station |
| topic | pumped storage Wuyue Reservoir transient numerical simulation parameter inversion seepage field |
| url | https://www.mdpi.com/2076-3417/13/8/5196 |
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