지하채굴공동 안정성 해석을 위한 암반등급 분류법의 비교 연구

Abstract

The design of level and pillar is very important for safe mining work. The rock mechanic advancement is possible for the mechanical design of mining by numerical analysis that meets practice. Because the rock mass has an unreliable factor, the proper formation model representing an object ground in case of investigating behavior at underground carven excavation must apply to obtain the reliability of analysis result. On this study, It is compared with the stability of pillar to make a selection of numerical analysis by Hoek-Brown Model and Mohr-Coulomb Model at FDM analysis and so presented proper formation model. The RMi system is based on defined inherent parameters of the rock mass and is obtained by combining the compressive strength of intact rock and a jointing parameter and an improved method to determine the constants m and s in the Hoek-Brown failure criterion for rock masses. By using numerical analysis program for the accuracy of constants m, s calculated by RMi in Hoek-Brown failure criterion also compared with the constants calculated by RMR. The reliability of constants calculated by RMi is confirmed. The result of analysis to select proper numerical analysis model on this study site is comparatively high stress level and Hoek-Brown model is possible for a safe design. The parameter calculated by RMi is almost equal to the parameter calculated by RMR.