脆岩超大断面隧道双层初支支护时机研究

doi:10.13722/j.cnki.jrme.2023.0377

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Abstract By improving the existing failure approach theory，a safety evaluation index(BRSI) for assessing the mechanical state of brittle rock masses is established，enabling a quantitative expression of the elastic state，strain hardening state，brittle failure and residual state of brittle rock masses. Based on the quantitative relationship between the mechanical state of brittle surrounding rock and the BRSI index，a novel approach is proposed to determine the optimal timing for double-layer primary support during the sequential excavation of super-large section tunnels in brittle rock masses. The proposed method is analyzed and validated through three-dimensional numerical simulations conducted in the Xiabeishan Tunnel project. The results demonstrate that：(1) Under a low confining pressure，tuff undergoes brittle failure immediately upon reaching its ultimate strength. With the increase of the confining pressure，however，tuff shows the characteristics of gradual softening. (2) During tunnel construction，the development of BRSI value of the surrounding rock undergoes three stages as initial development，rapid development and gradual stabilization. (3) The excavation of the rock pillar of the middle pilot tunnel alters the stress state and failure mode of the tunnel wall?s surrounding rock，resulting in the optimal support timing for the middle pilot tunnel lagging behind the side pilot tunnels by 2–10 m. (4) The mechanical state of brittle surrounding rock can be accurately and intuitively characterized by BRSI index，and the proposed method for determining support timing is reasonable and reliable.

Key words： tunnelling engineering failure approach index brittle rock mass super-large section tunnel sequential excavation double-layer primary support support time

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	Articles by authors
	HE Jiaxin1
	HE Shaohui1
	LIU Xiabing2
	MA Jianfei1

Cite this article:

HE Jiaxin1,HE Shaohui1,LIU Xiabing2, et al. Study on supporting time of double-layer primary support for super-large section tunnels in brittle rock#br#[J]. , 2023, 42(12): 3010-3019.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2023.0377 OR https://rockmech.whrsm.ac.cn/EN/Y2023/V42/I12/3010

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