西南山区某隧道地应力特征及岩爆危险性评价

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Abstract Research purposes: The granite tunnel in the southwest mountainous area is located in the Yarlung Zangbo River suture zone, the geological conditions are extremely complex and the regional tectonic action is strong, and the risk of high geo-stress and rockburst disaster in tunnel construction is extremely significant. According to the regional geological data, combined with the measured in-situ stress data of the nearby engineering area, the numerical calculation model of the tunnel was established by COMSOL, the initial in-situ stress field of the tunnel site area was analyzed by the boundary load adjustment method, the in-situ stress characteristics was studied, and the rock burst hazard level of the granite tunnel was discussed.
Research conclusions: (1)The maximum horizontal principal stress S_H of the granite tunnel axis is 5.1~33.5 MPa, the vertical principal stress S_v is 4.2~55.1 MPa, and 80.48% of the area along the tunnel is in the state of high to extremely high in-situ stress.(2)When the tunnel depth is less than 600 m, the granite tunnel is mainly dominated by horizontal tectonic stress, the stress field type is mainly S_H>S_v>S_h, and the stress structure is strike-slip type.When the tunnel buried depth exceeds 600 m, the vertical principal stress of large buried depth begins to dominate, and the stress field type is mainly S_v>S_H>S_h, indicating that the stress structure is a positive fault type.(3)The granite tunnel strata are mostly hard and brittle surrounding rocks of grade Ⅱ and Ⅲ. According to the test results of rock elastic energy index and brittleness coefficient, the medium grain amphibolite black cloud granite has the energy storage and energy release conditions of medium rockburst tendency.(4)Based on the evaluation method of the maximum initial stress value S_max and the rock strength stress ratio R_c/S_max, the total length of the granite tunnel is 13 047 m, and the risk section of strong and extremely strong rockburst is 9 000 m, accounting for 68.98%.(5)The research conclusion of this paper can provide data support for the investigation and design of deep-lying long tunnel and rockburst disaster prevention in complex mountainous areas under similar geological conditions.

Key words： southwest mountains granite tunnel in-situ stress characteristics rockburst tendency rockburst risk evaluation

Received: 11 October 2023

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TU45

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	Articles by authors
	ZHOU Hang
	ZHANG Guangze
	ZHAO Xiaoyan
	CHEN Shikuo
	XIE Rongqiang
	LIN Zhiheng
	LI Jiayu
	SHEN Wei

Cite this article:

ZHOU Hang,ZHANG Guangze,ZHAO Xiaoyan, et al. In-situ Stress Characteristics and Rockburst Risk Evaluation of a Tunnel in the Southwest Mountains[J]. Journal of Railway Engineering Society, 2023, 40(12): 48-54.

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https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2023/V40/I12/48

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