Assessment of mining induced subsidence hazard in abandoned coal mine areas using the strength reduction technique
In abandoned coal mine areas, various mining hazards such as ground subsidence, soil pollution and acid mine drainage have been occurring that are highly prone to cause social and economic troubles. Especially, ground subsidence needs to be carefully managed because it is difficult to accurately predict the location, scale and time of its occurrence. The aim of this study is to develop a risk assessment method of ground subsidence in abandoned coal mine areas considering the effect of mined cavities and rock mass conditions. The strength reduction technique which is often used in the slope stability analysis was employed to calculate the factor of safety of the abandoned mines, and FLAC was used to implement the technique. Five variables, i.e. the depth, width, height, angle of cavity and rock mass condition, were considered in the analysis. A numerical prediction model for subsidence was derived from the regression analysis. In addition, application methods were suggested to estimate the influence area of subsidence at the ground surface and to evaluate the interaction between multiple cavities. Finally, to validate the developed approach in this study, a risk assessment analysis was performed on an abandoned coal mine site. Most subsidence traces surveyed in the real subsidence site well matched the subsidence risk contour map obtained in the prediction model analysis.
Byungkyu Jeon Seokwon Jeon
Department of Energy Systems Engineering, Seoul National University, Seoul, Korea
国际会议
西安
英文
152-165
2016-05-25（万方平台首次上网日期，不代表论文的发表时间）