互层岩体隧道爆破超欠挖控制技术研究

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Abstract Research purposes: The poor interlayer cementation and low overall stiffness of interbedded rock masses make it easy for over-under-excavation problems to occur during tunnel drilling and blasting. In order to investigate the influence of interlayer rock on tunnel blasting over-under-breaking, this paper takes the interlayer section of Jianshan tunnel project of new Zhongwei-Lanzhou dedicated passenger line as the research object, and uses discrete element numerical simulation method and laser scanning image to analyze the influence of interlayer dip angle and thickness on tunnel over-under-excavation, based on which the optimization plan of gun hole arrangement is proposed.
Research conclusions: (1) The problem of over-excavation in smooth blasting of interlayer tunnels is prominent, the over-excavation is mainly on the right side of the tunnel when the interlayer is left inclined, and the over-breaking is serious at the position where the direction of stress wave propagation is perpendicular to the direction of the structural surface. (2) The over-breaking at the top of the arch is the largest when the interlayer is close to horizontal, and the maximum over-excavation position shifts from the top to the foot as the inclination of the interlayer increases. (3) The increase in the thickness of the interlayer is beneficial to the stability of the surrounding rock, and the average amount of over-breaking after the layer thickness exceeds 0.7 m can meet the requirements of the specification, and it is recommended that the design of the hole must be optimized when the layer thickness is less than 0.7 m. (4) Through the optimization of hole arrangement around the location of easy over-breaking, the tunnel profile is formed more smoothly, and the maximum linear over-breaking is reduced by 60 cm, and the average over-breaking is reduced by about 36 cm. (5) The research results can provide reference for the control of over-under-breaking of smooth blasting in interbedded rock tunnel.

Key words： discrete element numerical simulation interbedded rock masses smooth blasting over-under-excavation

Received: 11 October 2021

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Cite this article:

DING Xiang. Research on the Control Technology of Over-under-excavation of Tunnel Blasting in Interbedded Rock Masses[J]. Journal of Railway Engineering Society, 2022, 39(3): 75-80.

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https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2022/V39/I3/75

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