基于CT扫描的巷道岩爆洞壁破坏特征实验研究

doi:10.13722/j.cnki.jrme.2019.0942

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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.

Key words： rock mechanics tunnel rockburst slabbing failure CT technology tensile crack inoculation mechanism

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	Articles by authors
	LIANG Peng1
	ZHANG Yanbo1
	SUN Lin1
	YAO Xulong1
	TIAN Baozhu1
	LIU Xiangxin1
	HUANG Yanli2
	CHEN Shaojie3

Cite this article:

LIANG Peng1,ZHANG Yanbo1,SUN Lin1, et al. Experimental study on damage characteristics of tunnel wall after rockburst based on CT scanning[J]. , 2020, 39(S1): 2612-2622.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2019.0942 OR http://rockmech.whrsm.ac.cn/EN/Y2020/V39/IS1/2612

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