Statics analysis model for rock burst of driving faces with stress inclusions

Abstract

Local dynamic phenomena or dynamic disasters such as rock burst often occur in the driving faces of underground rock roadway.In order to study its occurrence mechanism,based on the"locked in"stress hypothesis,a simplified mechanical model with a stress inclusion was established.Based on the basic theory of elastic mechanics,the stress distribution formula and the maximum principal stress formula of the driving face with a stress inclusion were derived.Based on the maximum principal stress criterion,when the rock roadway is located at a certain distance from the inclusion,the rock between the fracture planes along the direction of maximum principal stress could move to the excavation space under the combined action of overlying strata and stress inclusions,and form a V-shaped blasting pit.The research in this paper can explain the rock burst phenomena of driving face to a certain extent,and provide theoretical support for preventing rock burst.

Keywords

• driving face
• rock burst
• stress inclusion
• maximum principal stress