Study on physical and numerical simulation of failure laws of wall rock due to transformation from open-pit to underground mining
Abstract：Based on the engineering background of Jianshan Iron mine in Panzhihua city, the caving mechanism and moving area of wall rock during transformation from open-pit to underground mining using similar material physical models and numerical simulation was researched. Firstly the similar material physical model was monitored with stress database collection box, total station instruments and digital camera shooting equipment to obtain the stress-displace- ment characteristics and failure process. Systematic analysis was made on stress displacement and crack failure of wall rock to discover the basic caving and moving mechanism of wall rock. Secondly the stress and displacement change, plastic zone distribution and disturbed angle change of model was systematic analyzed using numerical simulation soft- ware. The results indicate that the wall rock stress undergoes a course from dramatic change to slow change and finally shows a tendency toward stabilization. The extent of damage and the plastic zone increases with the mining depth in- creasing. The shear failure of the rock mass mainly appears at the foot of the two sides slopes.
Keywords：openpit to underground miningfailure law of wall rockmodel experimentnumerical simulationcavedzone
Publication Date：2012-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 186-191 )