软弱隧道围岩拱顶塌方及锚杆支护效应试验研究

doi:10.13722/j.cnki.jrme.2016.0902

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Abstract In order to study the failure characteristics of weak rock mass and the anchoring effect of rock bolts，a series of geomechanical model experiments were carried out to simulate tunnel excavation in rock mass of grade Ⅳ，which includes two modes，unsupported and supported with bolts. Subsequently，the evaluation laws of displacement，stress and the macroscopic failure forms of the surrounding rock mass were analyzed through a comprehensive comparison. According to the experiment results，the following conclusions can be drawn. (1)The damage of surrounding rock induced by tunnel excavation starts from tunnel arch foot，extending upwards gradually and collapsing into arch eventually. (2) Due to the anchor suspension and extrusion effect of bolts combined with the rock beam effect，the rock collapse zone can be reduced significantly. (3) The bolts can improve the strength and toughness of rock mass owning to the applied anchor force，which is conducive to enhance the bearing capacity and the deformation resistance ability of surrounding rock. (4) The bolts can make the surrounding rock obtain a stable equilibrium with high energy，which not only makes the stress distribution in rock mass more balanced，but also delays the rock entering into the “softening” stage. The conclusions gained can provide references for the stability evaluation of soft rock mass during tunnel construction as well as the design and construction of the supporting structures.

Key words： tunnelling engineering weak rock mass progressive failure anchoring mechanism model experiment

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	Articles by authors
	CHENG Panpan1
	XU Qianwei1
	ZHU Hehua2
	DING Wenqi2
	CHEN Guozhong3
	WU Yongbo3

Cite this article:

CHENG Panpan1,XU Qianwei1,ZHU Hehua2, et al. Model experiment study on the failure characteristics of weak surrounding rock mass above tunnel arch and the anchoring effect of bolts[J]. , 2016, 35(S2): 3561-3569.

URL:

https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2016.0902 OR https://rockmech.whrsm.ac.cn/EN/Y2016/V35/IS2/3561

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