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SEISMIC STABILITY ANALYSIS OF THE YANGHUYA FLY ASH TAILINGS DAM (2014)
The Yanghuya tailings dam, which is located in the city of Zibo, China, exposes the residential area below the dam to a high level of flood debris risk, and, as such, the stability of the tailings dam was evaluated. The seismic stability of the tailings dam was evaluated using pseudo-static and time-response approaches in the program FLAC, as the site is located in seismic intensity zone VII. The pseudo-static factor of safety (FOS) of the dam indicates that the FOS of tailings
dam is above 1.13, which is within the permissible limits of the China National Standard Safety Code, which requires that the FOS must be above 1.05. A dynamic time-response analysis indicates that slides or large displacements may occur in the embankment fill along the interface between the silty clay and the bedrock. The sensitivity of these displacements to the damping ratio and the shear strength was evaluated. Improvements to the monitoring program are also proposed.
Environmental & Engineering Geoscience, Vol. XX, No. 4, November 2014, pp. 371–391
School of Earth Science and Engineering, Nanjing University, XixiaDadao Road 163, Nanjing, 210093, China