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Microseismic Monitoring and 3D Finite Element Analysis of the Right Bank Slope, Dagangshan Hydropower Station, during Reservoir Impounding

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Abstract

The right bank slope of Dagangshan hydropower station in China has complex geological conditions and is subjected to high in situ stress. Notably, microseismic activities in the right bank slope occurred during reservoir impounding. This paper describes the microseismic monitoring technology, and three-dimensional (3D) finite element analysis is used to explore the microseismic activities and damage mechanisms in the right bank slope during reservoir impounding. Based on data obtained from microseismic monitoring, a progressive microseismic damage model is proposed and implemented for 3D finite element analysis. The safety factor for the right bank slope after reservoir impoundment obtained from the 3D finite element analysis, which included the effects of progressive microseismic damage, was 1.10, indicating that the slope is stable. The microseismic monitoring system is able to capture the slope disturbance during reservoir impounding in real time and is a powerful tool for qualitatively assessing changes in slope stability over time. The proposed progressive microseismic damage model adequately simulates the changes in the slope during the impoundment process and provides a valuable tool for evaluating slope stability.

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Abbreviations

\(D\) :

Damage variable

\(E\) :

Elastic modulus

\(K\) :

Safety factor

\(M\) :

Moment tensor

\(\dot{M}\) :

The rate of the moment tensor

RFPA-3D:

3D realistic failure process analysis

\(S_{\text{tep}}\) :

Load step

\(U^{\text{e}}\) :

Total releasable elastic strain energy

\(U_{\text{M}}\) :

Radiation energy

\(V\) :

Structure block volume

\(\Delta g\) :

Centrifugal loading coefficient

\(\Delta U\) :

Actual assigned energy

\(\gamma\) :

Material unit weight

\(\dot{\varepsilon }_{1}\) :

Principal extension strain rate

\(\dot{\varepsilon }_{2}\) :

Principal contraction strain rate

\(\dot{\bar{\varepsilon }}\) :

Mean strain rate

\(\eta\) :

Seismic efficiency

\(\mu\) :

Shear modulus

\(\nu\) :

Poisson’s ratio

\(\sigma\) :

Compressive strength

\(t\) :

Time interval

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Acknowledgements

The authors are grateful for the financial support from the Chinese National Programs for Fundamental Research and Development (973 Program) (No. 2014CB047100) and the Chinese National Natural Science Foundation (No. 51279024).

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Authors and Affiliations

  1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, 116024, China

    Xingzong Liu, Chun’an Tang & Lianchong Li

  2. Guodian Dadu River Dagangshan Hydropower Development Co., Ltd., Ya’an, 625409, China

    Pengfei Lv

  3. School of Engineering and ICT, University of Tasmania, TAS, 7005, Australia

    Hongyuan Liu

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  1. Xingzong Liu
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  2. Chun’an Tang
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Correspondence to Chun’an Tang.

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Liu, X., Tang, C., Li, L. et al. Microseismic Monitoring and 3D Finite Element Analysis of the Right Bank Slope, Dagangshan Hydropower Station, during Reservoir Impounding. Rock Mech Rock Eng 50, 1901–1917 (2017). https://doi.org/10.1007/s00603-017-1191-5

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