接触面粗糙度对软岩隧道锚渐进破坏特征的影响研究

doi:10.13722/j.cnki.jrme.2022.0688

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Abstract To investigate the influence of the roughness of the interface on the progressive failure characteristics of tunnel-type anchorage(TTA) in soft rock，three similar models of TTAs with different interface roughnesses were made，and the digital image correlation technology was employed simultaneously to systematically compare and analyse the propagation and spatial distribution characteristics of cracks during progressive failure of TTAs. The results indicate that the ultimate bearing capacity of the TTA decreases gradually with the decrease of the roughness of the interface. Furthermore，the initiation angle of the crack in the surrounding rock increases gradually with the decrease of the roughness of the interface. Simultaneously，the initiation location of the main crack in the surrounding rock of the upper part of the plug body also gradually moves to the middle and front end of the crown of the plug body. The surrounding rock in the upper part of the plug body changed from the overall failure to the local failure. The failure range of surrounding rock is concentrated in the middle and front part of the crown. The cracks near the floor of the plug body gradually change from shear cracks into sporadic large-angle short cracks. The shear cracks are approximately parallel to the axis of the plug body and penetrate to the ground surface. The failure mode of the lower part of the plug body changed from a thin shear zone to slip along the interface. With the decrease of interface roughness，the failure sequence of the TTA changes from “compressive-shear(or tensile-shear) failure of rock mass at the back end of the crown→slip and debonding of interface→tensile-shear and tensile failure of rock mass at the middle front end of the crown” to “slip and debonding of interface→tensile-shear failure of rock mass at the front end of the crown→tensile failure of rock mass at the back end of the crown”. The research results can provide a basis for revealing the working characteristics and failure mechanism of TTAs and improving the design calculation theory.

Key words： rock mechanics tunnel-type anchorage in soft rock roughness of interface progressive failure；model test digital-image correlation

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	Articles by authors
	HAN Yafeng1
	2
	LIU Xinrong2
	3
	LIANG Ninghui2
	3
	LIU Mingwei1
	ABI Erdi1
	DENG Zhiyun2
	4
	LAI Guosen5

Cite this article:

HAN Yafeng1,2,LIU Xinrong2, et al. Influence of the interface roughness on the progressive failure characteristics of tunnel-type anchorage in soft rock[J]. , 2023, 42(7): 1650-1661.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0688 OR https://rockmech.whrsm.ac.cn/EN/Y2023/V42/I7/1650

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