铁路隧道双指标高地应力界定及岩爆大变形分级标准

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Abstract Research purposes: At present, the classification of large deformation of rock burst in tunnels with high geostress environment is mainly based on theoretical research, and the results are different from the actual construction and excavation. Therefore, by summarizing 78 cases of railway, highway tunnels and hydropower diversion tunnel projects, this paper systematically studies the high geostress state of the tunnel surrounding rock and the classification and definition of the large deformation of rock burst. Combined with the relevant tunnel design specifications adopted in current practical projects, the traditional high geostress identification standard and the rock burst and large deformation classification standard are optimized, and a quantitative definition method that is more in line with the actual engineering is proposed.
Research conclusions: (1) Based on the statistical analysis of engineering cases, a dual-index high geostress quantitative definition method using the strength-stress ratio and the maximum geostress absolute value is proposed, and a dual-index high geostress quantitative identification table for hard rock and soft rock is proposed. (2) A rock burst grade classification standard based on the rock strength-stress ratio R/σ_max and the maximum geostress σ_max is proposed, and a large deformation grade based on the rock mass strength-stress ratio R_m/σ_max and the maximum geostress σ_max is proposed. (3) The research results can be applied to the identification of the high geostress state of the surrounding rock of railway tunnels and the classification of disaster grades, and are suitable for the field of engineering geological survey.

Key words： high geostress rock burst large deformation strength-stress ratio maximum geostress

Received: 20 May 2022

PACS:

P642

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	Articles by authors
	ZHANG Guangze
	JIA Zheqiang
	FENG Jun
	YUAN Chuanbao
	CHAI Chunyang
	CHEN Minghao
	FENG Tao
	TAO Yujing

Cite this article:

ZHANG Guangze,JIA Zheqiang,FENG Jun, et al. Definition for Dual-index High Geostress and Classification Standard for Rock Burst and Large Deformation in Railway Tunnels[J]. Journal of Railway Engineering Society, 2022, 39(8): 53-58.

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https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2022/V39/I8/53

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