Effects of blasting excavation of 1st tunnel of small clear distance tunnels on surrounding rock stability of 2nd tunnel

被引：0
|
作者：
Li X. [1 ]
Li W. [1 ]
Bi Z. [2 ]
Liang B. [1 ]
机构：
[1] School of Civil Engineering and Architecture, Henan University of Science & Technology, Luoyang
[2] The 1st Construction Co., Ltd., China Railway Construction 15th Group, Xi'an
来源：
Zhendong yu Chongji/Journal of Vibration and Shock | 2024年 / 43卷 / 07期
关键词：
blasting excavation; clear distance between tunnels; numerical simulation; small clear distance tunnel; surrounding rock stability; vibration response;
D O I：
10.13465/j.cnki.jvs.2024.07.005
中图分类号：
学科分类号：
摘要：
Here, to study effects of blasting excavation of 1 st tunnel of small clear distance tunnels on surrounding rock stability of 2nd tunnel, taking Fangjun tunnel project of Yidong high-speed highway in Zhejiang Province as the engineering background, a formula for calculating vibration velocity of surrounding rock during blasting construction was derived based on the energy attenuation law, and the finite element software MIDAS GTS NX was used to simulate variation laws of vibration velocity and stress of surrounding rock under different clear distance conditions. The numerical results of vibration velocity of surrounding rock and the theoretical values were analyzed contrastively to verify the correctness of the vibration velocity calculation formula. Based on the relation between vibration velocity and stress, a vibration velocity threshold was proposed to ensure tunnel safe construction. The results show that the maximum relative error between the theoretical values and simulated values of vibration velocity of 2nd tunnel surrounding rock is 5. 9%, and the maximum relative error between the theoretical values and on-site monitoring data is 7% to verify the correctness of the theoretical formula; peak vibration velocity of 2nd tunnel is negatively correlated to 1st tunnel blast center distance; peak vibration velocity values of monitoring points on facing blast side of surrounding rock are larger than those on back blast side; 2D is the minimum safety clear distance during blasting construction of Fangjun tunnel, where D is the tunnel clear distance; at this time, the maximum vibration velocity peak value of upper step excavation is about 1. 2 times that of lower step excavation; after blasting excavation, stress peak value and vibration velocity peak value of surrounding rock are mainly concentrated near arch waist and arch foot; with increase in clear distance, effects of 1st tunnel on 2nd tunnel gradually weakens and is ultimately ignored; under blast action, there is a certain linear relation between stress peak value of surrounding rock and its vibration velocity peak value; the vibration velocity control threshold to ensure safe construction of tunnel blasting is 1.9 cm/s; the study results can provide a reference for similar small clear distance tunnels projects blasting construction in future. © 2024 Chinese Vibration Engineering Society. All rights reserved.
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页码：42 / 49and83
页数：4941
相关论文
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