Stability and rockburst tendency analysis of fractured rock mass considering structural plane

Abstract

The stability analysis of surrounding rock mass is an important prerequisite and basis for judging the technical factors of tunnel excavation. In this research, the geological disasters such as roof falling, and rockburst have occurred at the oredrive located in the north wing of -630m level an underground mine belonged to Shandong Gold Group. Combined with the joint fracture scanning, rock mechanics test and PFC2D numerical simulation, the prediction of rockburst tendency and rock mass classification were carried out in this area. Based on the rock mechanics parameters of the complete rock mass, the rock mass mechanics parameters and the original rock stress were estimated. Results show that: A. The surround rock in this area is grade III rock mass, and the quality of rock mass is poor while accompanied by wedge caving; B. There is a medium to strong potential to experience rockburst, however, due to the development of joints in the area, the rock mass cannot store a large amount of elastic strain energy, which reducing the possibility of rockbursts in this area; C. The failure of rockmass in this area is dominated by structural plane.