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http://dx.doi.org/10.12989/gae.2021.27.4.405

An efficient approach for stability analysis of rock slopes subjected to a transient drawdown  

Hu, Yining (School of Civil Engineering and Transportation, Hohai University)
Ding, Ying (School of Automotive and Transportation Engineering, Hefei University of Technology)
Sun, Zhibin (School of Automotive and Transportation Engineering, Hefei University of Technology)
Publication Information
Geomechanics and Engineering / v.27, no.4, 2021 , pp. 405-417 More about this Journal
Abstract
Since the water drawdown in a reservoir easily triggers the instability of a nearby slope, chart research on slopes that are subjected to drawdown conditions has attracted extensive attention recently. However, most studies only consider the extreme 'rapid/slow' drawdown conditions and ignore the general 'transient' drawdown scenario. This paper proposes an efficient approach for stability analysis of rock slope subjected to a transient flow, and provide a chart study and a parametric analysis. To address the challenge of determining the bent phreatic surface in a transient flow and to employ the nonlinear Hoek-Brown criterion of rock masses, a phreatic equation was adopted in this paper, together with the discretization technique. In the framework of limit analysis, the external work rate and the internal energy dissipation rate were computed. A calculation flow was proposed for capturing the optimized factor of safety (FOS) based on the strength reduction technique. Then, following the evaluation of this approach, a set of stability charts and an application example were presented. A parametric analysis was conducted to evaluate the influences of the rock properties and the hydrodynamic parameters on the factor of safety.
Keywords
Hoek-Brown failure criterion; limit analysis; stability charts; transient flow; water drawdown;
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