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Report No.

Earthquake response analysis of a mine rubble deposit sites using NMM+DDA coupled analysis

Horikawa, Shigeo*; Sasaki, Takeshi*; Koshigai, Masaru*; Fukushima, Shigeru ; Ohara, Yoshiyuki

This paper aims to analyze the scope and environmental impact of the mine deposit rocks sliding down when an active-fault earthquake occurs at the site in Tottori Prefecture, southwest Japan. The authors analyzed the behavior prediction of waste rocks in earthquake using Numerical Manifold method (NMM) and Discontinuous Deformation Method (DDA) coupled analysis in this study. In order to evaluation on the seismic stability of the mine deposit rock site, dynamic stability analysis is performed by FEM based on time history data of seismic stress and seismic acceleration which is generally obtained by two-dimensional seismic response analysis (dynamic FEM analysis). And the sliding amount is calculated by dynamic time history calculation (Newmark method). However, the Newmark method is an analysis method which is used on the premise that it can be treated as a small deformation theory. An elastic-plastic deformation of the mine deposit rocks is not considered in the method. The consideration of numerical analysis modelling at the site, (i) the behavior of the bedrock as a continuum and the behavior of the waste rocks as a discontinuity must be coupled analyzed. (ii) if the mine deposit rocks collapse due to the earthquake, it will be necessary to evaluate the impact on the surrounding area by risk of mine deposit rocks discharge (risk management), that is, to evaluate the scope and environmental impact of waste rocks falling down, the environmental impact, and its countermeasure costs. Since, an analysis method that can consider even large deformation (elastic-plastic behavior) of mine deposit rocks were required for this reason. From these conditions, the authors solved the bedrock using NMM, which can solve stress-deformation analysis of discontinuous rock mass, and the waste rocks were analyzed by coupling them using DDA that can reproduce slope collapse phenomenon such as collapse shape, arrival time, and fall speed due to the earthquake.



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