A study on the subsidence risk evaluation using 3-D rock mass collapse simulation for abandoned mines. Issue 1 (2nd January 2017) - Son, Min
Abstract: This paper suggests a way to evaluate the subsidence risk applicable to abandoned mines. For the subsidence risk evaluation, a diagram modified from Sakurai's tunnel stability evaluation diagram was developed. To check the feasibility of the modified diagram, two typical mines to represent Korean mines, one gold mine including one steep goaf and one coal mine including two gently sloped goafs were selected and 3-D numerical analyses for the sections in which actual subsidence was occurred were performed. In the numerical analyses, the variation in relative displacement strain between the observation point and reference point placed over the goafs according to the location of the points was analyzed, and the strain was applied to the modified diagram to evaluate the subsidence risk. The results show that the critical factors in the subsidence risk evaluation are the relative locations of the observation and reference points from the goafs as well as joints existing between goafs and the ground.