小净距隧道先行洞爆破开挖对后行洞围岩稳定性影响研究

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Abstract In order to study the influence of blasting excavation on the stability of surrounding rock in the tunnel with a small clear distance, taking the Yidong high-speed Fangjun tunnel project in Zhejiang province as the engineering background, the calculation formula of surrounding rock vibration velocity during blasting construction was derived according to the law of energy attenuation. The finite element software MIDAS GTS NX was used to simulate the change law of surrounding rock vibration velocity and stress under different clear distance conditions. The numerical results of vibration velocity in surrounding rock are compared with the theoretical values to verify the accuracy of the formula. According to the relation between vibration velocity and stress, the threshold value of vibration velocity is proposed to ensure the safe construction of tunnels. The results show that: (1) The maximum relative error between the theoretical value and the simulated value is 5.9%, and the maximum relative error between the theoretical value and the field monitoring data is 7 %, which verifies the accuracy of the theoretical formula. (2) There is a negative correlation between the peak vibration velocity of the rear tunnel and the distance between the blasting center of the first tunnel, and the peak vibration velocity of the monitoring point on the blasting side of the surrounding rock is greater than that on the back explosion side. 2D is the minimum safe clear distance of the anti-military tunnel during blasting construction (D is the clear distance of the tunnel), at this time, the maximum peak vibration velocity of the excavation of the upper step is about 1.20 times that of the lower step. (3) After blasting excavation, the peak stress and vibration velocity of the surrounding rock are mainly concentrated near the arch waist and arch foot. With the increase in the clear distance, the influence of the advance tunnel on the rear tunnel gradually weakens and is eventually ignored. (4) Under the action of blasting, there is a certain linear relationship between the peak stress of surrounding rock and the peak vibration velocity, and the vibration velocity control threshold to ensure the safe construction of tunnel blasting is 1.9 cm∙s-1. The research results can provide a reference for the blasting construction of similar small clear-distance tunnel projects in the future.

Key words： small clear distance tunnel tunnel clearance blasting excavation vibration response； stability of surrounding rock numerical simulation

Received: 24 April 2023 Published: 15 April 2024

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	Articles by authors
	LI Xuzhe1
	LI Wenjie1
	BI Zhigang2
	LIANG Bin1

Cite this article:

LI Xuzhe1,LI Wenjie1,BI Zhigang2, et al. Effects of blasting excavation of 1st tunnel of small clear distance tunnels on surrounding rock stability of 2nd tunnel[J]. JOURNAL OF VIBRATION AND SHOCK, 2024, 43(7): 42-49.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2024/V43/I7/42

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