常截面滚刀贯入试验中岩石破坏行为分析

doi:10.13722/j.cnki.jrme.2015.0532

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Abstract The rock loading system and acoustic emission monitoring system were employed to conduct the indentation tests on four rocks with different strengths，namely mudstone，granite，sandstone and cement mortar specimens with cubic dimensions，with or without lateral confinement. The complete load-penetration curves and acoustic emission parameters were analysed together，and the process，form and mode of the rock fragmentation by TBM constant cross section(CCS) disc cutter were studied. The load drop of the load-penetration curve for soft rock is not obvious and the rock fragmentation presents the failure characteristic of elastoplasticity，while the load drop is remarkable in accordance with the brittle rupture for hard rock indentation test. The rock fragmentation without lateral confinement can be regarded as obvious splitting fracture mode and the failure process of the confined specimen is controlled by the combined effect of both splitting fractures and lateral fractures. The curves of acoustic emission parameters are in good agreement with the load-penetration curves and can generally reflect the damage，degradation and fracture formation of the indented rock specimens. The indentation tests conducted on the rock-like material can reproduce the fragmentation process and failure mode of the natural rock at some extent，but due to the discordances of the strength and deformation properties between rock-like material and natural rock，the results obtained from similar material simulations should be further investigated.

Key words： rock mechanics tunnel boring machine(TBM) constant cross section(CCS) disc cutter indentation test acoustic emission(AE)

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	Articles by authors
	LIU Quansheng1
	PAN Yucong1
	LIU Jianping1
	KONG Xiaoxuan2
	SHI Kai3
	LIU Qi2

Cite this article:

LIU Quansheng1,PAN Yucong1,LIU Jianping1, et al. Analysis on fragmentation behavior of rocks in indentation tests by disc cutter[J]. , 2016, 35(S2): 3516-3525.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2015.0532 OR https://rockmech.whrsm.ac.cn/EN/Y2016/V35/IS2/3516

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