| Intelligent Prediction and Feedback |
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Relationship between reservoir bank deformation and reservoir-induced earthquakes during the impounding of high arch dams |
| WANG Xingwang1, LIU Yaoru1, LÜ Shuai2, YANG Qiang1 |
1. State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China;
2. Xuzhou Water Bureau, Xuzhou 221018, China |
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Abstract Reservoir bank deformation and reservoir-induced earthquakes have been observed during the impounding of arch dams. Reservoir-induced earthquakes may be precursors of widespread slope deformation, which can endanger the long-term, efficient and safe operation of arch dams. This paper presents an analysis of deformation monitoring data and seismic monitoring data before and after impounding of the Xiluodu arch dam. The results compare the reservoir bank deformation and the seismic activity variations in the reservoir area before and after impoundment which were used to analyze the mechanisms relating the reservoir bank deformation and the reservoir-induced earthquakes. The results show that the two processes are correlated with initially fast responses including hysteresis transitioning to slower responses and then to constant values. The fast response is due to the reduction of the effective stress caused by the mechanical action of the water that leads to irreversible plastic deformation and fault slip. The hysteresis is due to the decreased shear strength of the rock mass and faults due to the physicochemical action of the reservoir water, which leads to slow deformation of the rock mass and the sliding of faults. The correlation between the two phenomena provides a basis for intelligent monitoring and safety warnings of high arch dams during impounding.
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| Keywords
high arch dams
impounding
reservoir bank deformation
reservoir-induced earthquakes
correlation analyses
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Just Accepted Date: 31 March 2022
Issue Date: 31 March 2022
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2022,
Vol. 62
