复杂应力条件下裂隙网络扩展机制试验研究

doi:10.13722/j.cnki.jrme.2015.1544

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Abstract As one of the most common object in rock engineering，the fractures in the rock mass may appear initiation and propagation under the engineering disturbances. Fracture initiation and propagation will change the deformation and strength characteristics of rock mass obviously. Therefore，a series of uniaxial and biaxial compression tests are carried out for the fractured specimens through RMT–150C and lateral pressure-adding equipment. Combined with the characters analysis of fracture propagation path，failure modes，acoustic emission (AE) energy and the positions of AE events under different loading conditions，the mechanism of fracture propagation is researched. With the increase of lateral pressure，the ductility of stress-strain curves increases. The newly formed cracks propagate from the initial fracture tips under the whole conditions，while the propagation path changed hugely under the biaxial compression condition. The positions of AE events during the loading process match well with the macroscopical fracture propagation path. The ratios of AE events before fracture initiation and the whole loading process for the typical specimens are all above 80%，which proves that the fracture initiation and propagation is the result of microcracks development and damage accumulation in the specimen. The results are significant for simulating unstable process of engineering rock mass more effectively.

Key words： rock mechanics rock-like material fracture network complex stress condition physical tests propagation mechanism

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	Articles by authors
	LIU Xuewei1
	LIU Quansheng1
	2
	LIU Jianping1
	WEI Lai1

Cite this article:

LIU Xuewei1,LIU Quansheng1,2, et al. Experimental study on mechanism for fracture network initiation under complex stress conditions[J]. , 2016, 35(S2): 3662-3670.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2015.1544 OR https://rockmech.whrsm.ac.cn/EN/Y2016/V35/IS2/3662

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