支护结构对层状及软弱岩体隧道支护作用机制

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Abstract

In order to analyze the action mechanism of tunnel support structure and its supporting characteristics in layered and weak rock tunnel，indoor physical simulation test and steel-concrete composite beam of the three point bending tests were conducted successively，and the mechanical and deformation characteristics of common screw bolt and steel pipe anchorage of rock under uniaxial compression tests and the steel arch bending performance were researched. The test results show that，the bolt mainly achieves the anchoring effect by improving the stress state of surrounding rock and improving the strength of surrounding rock，and also the improvement of strength to anchorage surrounding rock is mainly the effect of compression zone of pre stress，the repairing effect of anchorage agent on surrounding rock and the strengthening effect of anchor rod on the whole strength and density of anchor. Through the CT scanning of the anchor specimens after the test，it is found that the crack arresting effect of the anchor on the crack is the result of the weakening，shear and stop of the crack in the anchorage zone，and the crack arrest effect is related to the size of anchorage zone. The larger the anchorage zone is，the better the crack arrest effect is. According to the different characteristics of bolt and anchor roll steel pipes，explosive bolts can anchorage layered shale tunnel lithology good，while the function of grouting steel pipe is more suitable for the poor lithology of the soft fractured rock mass.

Key words： tunnel engineering support structure anchor test support mechanism field test

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	Articles by authors
	TENG Junyang1
	2
	TANG Jianxin1
	2
	CHEN Yulong3
	ZHANG Yuning4

Cite this article:

TENG Junyang1,2,TANG Jianxin1, et al. Mechanism of support structure for tunnel in layered and weak rock mass[J]. , 2018, 37(S2): 4221-4234.

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https://rockmech.whrsm.ac.cn/EN/Y2018/V37/IS2/4221

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