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Stability Analysis of Upstream and Downstream Dam Slopes with Water Level Drawdown Using Response Surface Function

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Abstract

This paper presents a framework combining uncoupled slope stability analysis with second order polynomial response surface function to fully investigate the stability and reliability of upstream and downstream dam slopes (denoted by UDS and DDS, respectively) during water level drawdown period. The transient seepage analysis with Seep/w is followed by a traditional limit equilibrium method with Slope/w to obtain the minimum factor of safety (denoted by FSmin) at a given time step t and the failure probabilities of UDS and DDS at the time step Tm when a minimum FSmin is achieved are calculated and compared to provide much insights. The proposed methodology is illustrated against a typical soil dam. The comparative studies have indicated that for a given drawdown rate v, the FSmin of UDS first drops dramatically as t increases from 0 to Tm and then it increases gradually to a constant value at T when the steady seepage field is achieved. The FSmin of UDS at Tm decreases significantly as v increases. Both T and Tm values decrease as v increases for UDS. An identical value of FSmin is observed for all v values at their respective T values for a specific drawdown range for both UDS and DDS. The FSmin of DDS first increases significantly and then increases slightly and finally remains at a constant value. Compared with the FSmin at Tm, the failure probability of UDS indicates more significant influence of v on stability of UDS. As v and/or drawdown range increases, the failure probability of UDS has a potential to exceed that of DDS demonstrating the necessity and importance of considering both UDS and DDS in the case of water drawdown period. The cross influence of slope angle of UDS and DDS on the stability of UDS and DDS is found and this influence should be taken into account for stability analysis of dam slopes during water level drawdown conditions.

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Availability of data and material

The data and material used to support the findings of this study are available from the corresponding author upon request.

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Funding

National Natural Science Foundation of China (Grant No. 51778313).

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Authors and Affiliations

  1. School of Civil Engineering, Qingdao University of Technology, Qingdao, 266520, China

    Dongxian Li, Liang Li, Liang Xu, Chunli Li & Kaiqi Meng

  2. Qingdao Xinhuayou Construction Engineering Group Co., Ltd, Qingdao, 266101, China

    Yuan Gao

  3. Institute of Geotechnical Engineering, China Institute of Water Resources and Hydropower Research, Beijing, 100048, China

    Zhengquan Yang

Authors
  1. Dongxian Li
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  2. Liang Li
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  3. Liang Xu
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  4. Chunli Li
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  5. Kaiqi Meng
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  6. Yuan Gao
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  7. Zhengquan Yang
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Contributions

DL—drafting the manuscript; LL—in charge of the whole paper; LX—carried out the numerical simulation under the different conditions; CL—collate all date from numerical simulation; KM—prepare for the data sets used in training RSF; YG—perform RSF simulations; ZY—theoretical support on methodology in this paper.

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Correspondence to Liang Li.

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Li, D., Li, L., Xu, L. et al. Stability Analysis of Upstream and Downstream Dam Slopes with Water Level Drawdown Using Response Surface Function. Geotech Geol Eng 40, 3107–3123 (2022). https://doi.org/10.1007/s10706-022-02082-0

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  • DOI: https://doi.org/10.1007/s10706-022-02082-0

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