含软弱夹层隧道围岩松动破坏模型试验与分析

doi:10.13722/j.cnki.jrme.2015.0200

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Abstract Since weak interlayer often has a deterministic effect on the stability of tunnel surrounding rock mass. Its formation mechanism and area of loosening and failure zoon are the important basis for deciding reasonable support method. By taking a high way tunnel engineering through faults，lab similar model test was chosen to study the progressive process of surrounding rock mass loosening and failure zoon with weak interlayer in the case of no support system. An elasto-plastic damage constitutive model is introduced to numerically simulate the case of model test by FEM，which will be compared with model test. The study shows that：(1) the loosening zone and failure one of tunnel surrounding rock mass have similar formation mechanism with each other，which are initialize at lower part and expanded to upper one with arch shape because of the impact of interlayer. (2) The surrounding rock mass stress variations of upper part are obviously bigger than those of lower one after tunnel excavation. Based on the value of tangential stress increment，the area of loosening zone can be determinate. (3) Discriminating by damage variable in numerical analysis，the failure zoon of surrounding rock mass has a good agreement with that of model test，which is proved theoretically feasible.

Key words： rock mechanics weak interlayer tunnel surrounding rock loosening and failure model test numerical simulation

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	Articles by authors
	HUANG Feng1
	2
	ZHU Hehua3
	XU Qianwei4

Cite this article:

HUANG Feng1,2,ZHU Hehua3, et al. Model test and analysis about loose failure of tunnel surrounding rock mass containing weak interlayer[J]. , 2016, 35(S1): 2915-2924.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2015.0200 OR https://rockmech.whrsm.ac.cn/EN/Y2016/V35/IS1/2915

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