Abstract
The paper deals with the stability analysis of tailings dam subjected to dynamic loading induced by mining shocks which occurred in neighbouring copper mine. The main goal of the paper was to model the dynamic response of the dam during two extreme paraseismic events which occurred in 2016 based on accelerograms recorded at the dam toe. Dynamic response of the tailings dam was calculated using finite element method and the implicit time-integration method implemented in commercial codes. The boundary condition corresponding to dynamic loading was determined by deconvolution procedure. The error analysis showed that most precise signal reproduction is achieved while using target signal with peak value reduced by 40% as a test signal. Both acceleration and displacement time-series were successfully reproduced. Moreover, the stability analysis was conducted for five independent signals with design peak horizontal acceleration and showed that no permanent displacements should occur. The temporary horizontal displacement of the dam crest should not exceed 13 mm, assuming equivalent linear material model.
Highlights
The paper deals with the stability analysis of tailings dam subjected to dynamic loading induced by mining shocks which occurred in neighbouring copper mine
Good agreement was achieved for equivalent linear model while using chirp signal as test signal
The peak horizontal ground acceleration (PHA) of test signals was reduced by 40% with respect to the measured one
Summary
The paper deals with the stability analysis of tailings dam subjected to dynamic loading induced by mining shocks which occurred in neighbouring copper mine. The dam is a part of huge Tailings Storage Facility (TSF) Zelazny Most being the only place for deposition of post-flotation tailings for whole the Polish copper production, Fig. 1. Two relatively strong mining induced seismic events which occurred in March and October 2016 were the motive of presented analyses. The analyses were carried out for the VIIIW cross-section of the Western Dam (Fig. 1) where on March 8th 2016 peak horizontal ground acceleration (PHA) equal to 683 mm/s2 occurred which was the highest ever recorded acceleration at the TSF Zelazny Most. The epicentral distance to the seismic station located at the dam toe for analysed seismic events was equal to 1008 m and 1235 m, respectively
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