Citas bibligráficas
Luzquiños, L., (2023). Cálculo de coeficiente sísmico para una presa de relaves a partir del análisis de respuesta de sitio [Trabajo de suficiencia profesional, Universidad Nacional de Ingeniería]. http://hdl.handle.net/20.500.14076/26876
Luzquiños, L., Cálculo de coeficiente sísmico para una presa de relaves a partir del análisis de respuesta de sitio [Trabajo de suficiencia profesional]. PE: Universidad Nacional de Ingeniería; 2023. http://hdl.handle.net/20.500.14076/26876
@misc{renati/1751694,
title = "Cálculo de coeficiente sísmico para una presa de relaves a partir del análisis de respuesta de sitio",
author = "Luzquiños Sánchez, Luis Carlos",
publisher = "Universidad Nacional de Ingeniería",
year = "2023"
}
This work is promoted by an act of operational supervisión carried out by OSINERGMIN (Supervisory Agency for Investment in Energy and Mining). The record leaves in writing that the mining company must carry out a site response analysis in the tailings dam No. 4A due to the presence of a deep soil deposit that underlies its foundation. The author, contemplating this previous analysis and a scenario of the operation of the tailings dam, obtains the pseudostatic seismic coefficient by the criteria of Bray et al. (2017) and performs a comparative analysis with the seismic coefficient obtained by the Hynes - Griffin and Franklin (1984) criteria. This work reviews and compiles information on the existing tailings dam, regarding its topography, geology, geotechnical investigations, geophysical explorations, and seismic hazard study. The tailings dam is in the operation stage and is classified as a high risk dam, based on the risk evacuation carried out by the mining company and in accordance with the CDA guide (2014). The seismic criteria of the guide suggest a return period corresponding to Tr = 2475 years for these described conditions. For the non-linear site response analysis, it was necessary to perform the spectral adjustment of time - history seismic records of Peru and Chile (07 earthquakes). The seismic records were adjusted to the objective spectrum for a return period of Tr = 2475 years detached from the uniform hazard spectrum presented in the seismic hazard study (ZER, 2017). Once the spectral adjustment was made, we proceeded with the modeling of the soil column for the site response analysis in the DeepSoil v7.0 software. Because the soil deposit that underlies the dam corresponds to a granular soil throughout its extension, the degradation curves proposed by Menq (2003) were used. The software results (surface average response spectrum) indicate that there are seismic amplifications in the range of periods from 0,3 to 3,0 s. This is coherent with the results of Seed and Idriss (1983) for this type of soil deposits with depths greater than 60 m. In addition, it is observed that this average response spectrum is below the design spectrum of the technical standard NTP E030-Earthquake resistant design (2019), which leads to the conclusión that the latter is conservative. The author with the previous information of the non-linear site response analysis obtained the seismic coefficient by the criteria of Bray et al. (2017), and performed a comparative analysis with the seismic coefficient obtained by the Hynes-Griffin and Franklin (1984) criteria. Using these criteria, the pseudostatic seismic coefficients of Ks = 0,172 and 0,287, respectively, were determined. The safety factors obtained in the pseudostatic analysis by limit equilibrium using the SlideV6.0 software show safety factors of F.S. = 1,23 and 0,983 respectively, which leads to the conclusion that the Hynes-Griffin and Franklin (1984) criterion leads to a factor safety that is below the recommended minimum safety factor, resulting in a very conservative design. Finally, a comparative analysis of the criteria was carried out, evaluating the assumptions adopted for the seismic behavior of a slope, reaching the conclusion that performing pseudostatic analyzes of tailings dams with the criteria of Hynes - Griffin and Franklin (1984) leads to coefficients high seismic and very conservative scenarios for seismic design. On the other hand, the criterion of Bray et al. (2017) leads to lower seismic coefficients, is more rational, and is therefore the most suitable for the choice of a seismic coefficient for pseudostatic analyzes of tailings dams.
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