Research on the Influence of Structural Plane of Deep Buried Hard Rock Tunnel on Rockburst Failure Characteristics
The rockburst disasters are frequent during the excavation of deep buried hard rock tunnel,seriously threatening the construction safety and progress of the project,and the process of rockburst breeding and destruction is mainly affected by the structural plane.Based on the uniaxial compression test of rock samples in the rockburst area,this paper compares and analyzes the mechanical characteristics of different rock samples during the failure process,and re-veals the influence of structural plane on the rockburst failure characteristics in combination with typical rockburst cases during tunnel excavation.The results show that the rock samples with structural planes in the rockburst area of deep bur-ied hard rock tunnels have earlier macroscopic damage than intact rock samples,mainly characterized by reciprocating or secondary damage,while intact rock samples mainly exhibit stepwise damage in a stepped manner;The structural plane has a strong control effect on the failure process of rockburst.The probability of rockburst in the area where the structur-al plane exists is higher.The failure direction mainly extends along the development direction of the structural plane,and the scope and depth of damage are mainly controlled by the structural plane;The rockburst in the area where the struc-tural plane exists often occurs near the end of the structural plane or at the intersection of the structural plane.The re-search results can provide reference value for the prevention and control of rockburst disasters during the excavation of similar deep-buried hard rock tunnels.
deep buried tunnelhard rockrockburst disasterstructural planedestructive characteristics
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