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| Experimental study on damage characteristics of tunnel wall after rockburst based on CT scanning |
| LIANG Peng1，ZHANG Yanbo1，SUN Lin1，YAO Xulong1，TIAN Baozhu1，LIU Xiangxin1，HUANG Yanli2，CHEN Shaojie3 |
| (1. School of Mining Engineering，North China University of Science and Technology，Tangshan，Hebei 063210，China；2. School of Mines，China University of Mining and Technology，Xuzhou，Jiangsu 221116，China；3. College of Mining and Safety Engineering，Shandong University of Science and Technology，Qingdao，Shandong 266590，China) |
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Abstract The simulation test of rockburst in granite roadway is carried out and the three-dimensional space model of rockburst specimen is constructed by CT scanning. The failure mode of tunnel wall after rockburst is analyzed，and the process of rockburst development and its incubation mechanism are discussed based on the geometric shape and distribution characteristics of cracks. The results show that the failure pattern of tunnel wall after rockburst has significant duality in spatial distribution，which include V-shaped and pan-shaped two types of rockburst pits. The V-shaped rockburst pit is narrow and deep，and the pan-shaped rockburst pit is wide and shallow. The spalling phenomenon occurs on the tunnel wall，which produces many cracks approximately parallel to direction of principal stress. The farther away from the tunnel wall，the shorter the crack length，and the tensile fracture is the main failure mechanism. At the same time，many cracks nearly perpendicular to direction of principal stress are formed on the tunnel wall under shear stress，which is distributed within the diameter of the hole. The above cracks parallel and perpendicular to direction of principal stress interleave with each other，and bond to form a trap. After the rocks in the traps are ejected，rockburst pits are gradually formed. The occurrence mechanism of slab buckling rockburst can be summarized as follows：slab cracking failure，shear buckling fracture，rock mass ejection. Slab fracture and shear fracture are two core processes of rockburst，which are related to tension and shear fracture respectively. Among them，the plate cracking caused by tensional fracture provides the material basis of rockburst，and shear crack initiation and propagation provide a catastrophic "inducing factor" for the occurrence of rockburst，which is the key to the occurrence of rockburst. The research results provide strong evidence for revealing the mechanism of rockburst in roadway，which enrich and improve the understanding of the mechanism of slab buckling rockburst.
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2020, Vol. 39 
