隧道爆破施工对初支混凝土的影响研究

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Abstract Research purposes:Relying on the Shenjiaba No. 1 tunnel of the Chengdu-Kunming railway double line, this paper establishes an experiment on the damage of the initial concrete when the tunnel is drilled and blasted, to analyze the damage of the initial concrete by comprehensive experiments and numerical values. The model is calculated to obtain the safe vibration velocity threshold of the initial concrete to ensure the safety and reliability of the initial concrete during tunnel construction.
Research conclusions:(1) The blasting vibration monitoring test is carried out in Shenjiaba No.1 tunnel. The Sadovsky empirical formula is analyzed by regression analysis. Combined with the numerical model of tunnel construction, the obtained results are compared with the calculated results of Sadovsky empirical formula, and the Sadovsky empirical formula of combined vibration speed is corrected to v_合=78×(3Q/R)^1.38. (2) Taking C25 initially supported concrete used in site construction as the object, the damage experiment of initially supported concrete under blasting is carried out, the damage value of concrete at different ages is measured, and the safe vibration velocity threshold of concrete at different ages is obtained. (3) The technical parameters of the initial concrete from this paper have guiding significance for other similar projects.

Key words： tunnel engineering blasting construction blasting vibration initial concrete safe step distance

Received: 25 June 2021

PACS:

U455.6

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	Articles by authors
	TANG Xianxi
	XIA Dingding
	LI Danhe
	WANG Yaowu

Cite this article:

TANG Xianxi,XIA Dingding,LI Danhe, et al. Analysis of the Influence of Tunnel Blasting Construction on Initial Concrete[J]. Journal of Railway Engineering Society, 2022, 39(1): 73-78.

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https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2022/V39/I1/73

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