关键词: 深埋隧道, 岩爆, 结构面, 离散元

Abstract: On the basis of present research achievements on structure-type rockburst and with the project of Qamchiq tunnel in Uzbekistan as project background，the discrete element method is adopted to discuss the effect of occurrence，pacing and location of structural plane on rockburst under the condition of deep buried tunnel with single group structure plane.The most dangerous area of rock burst at tunnel，dig angle of the most easily induced rock burst and the most dangerous position of the structure plane are analyzed emphatically.Simulation results indicate that:under maximum horizontal principal stress conditions，the high risk position of rock burst mainly locates at stress concentration area around the top of arch tunnel vault with straight wall and the corner of side wall；Under single structure surface conditions，the occurrence of rock burst is basically concentrated on the steep position of structural plane，while the inclined plane generally does not occur rock burst；The occurrences of the plane will affect the failure mode of surrounding rock，where，inclined structure easily leads to the bending of surrounding rock，and steep structure is more likely to resulting in shearing or slipping along the direction of the structural plane.the spacing change of structural plane lead to the position change between structural plane and excavation boundary，thus affecting the rock burst；In generally speaking，the nearer the excavation boundary from the structural plane，the higher the stress is，and the more possibly rock-burst appears.This paper focuses on studying the affect of structural plane on rock-burst and analyzes the form of structural plane easily causing rock-burst.The research results play a guiding role in project positioning，rock-burst forecast and control.

Key words: Deep buried tunnel, Rockburst, Structural plane, Discrete element method