Analysis of Influence of Drilling and Blasting Construction on Surrounding Rock Damage of Multi-arch Tunnel Based on Energy Method

被引：0
|
作者：
He Z.-M. [1 ]
Cai J. [2 ]
Huang F. [3 ]
Liu Y.-X. [1 ]
机构：
[1] School of Traffic and Transportation Engineering, Changsha University of Science & Technology, Changsha, 410114, Hunan
[2] School of Architectural Engineering, Hezhou University, Hezhou, 542899, Guangxi
[3] School of Civil Engineering, Changsha University of Science & Technology, Changsha, 410114, Hunan
来源：
Zhongguo Gonglu Xuebao/China Journal of Highway and Transport | 2019年 / 32卷 / 09期
关键词：
Damage of surrounding rock; Numerical simulation; Tunnel engineering; Vibration velocity;
D O I：
10.19721/j.cnki.1001-7372.2019.09.014
中图分类号：
学科分类号：
摘要：
The aim of this study was to address the problem of surrounding rock damage caused by blasting construction in a multi-arch tunnel without an advancing middle drift, based on the drilling and blasting construction of the Santaipo multi-arch tunnel without middle drifts at the Wu-ding to Yi-men Expressway in Yunnan Province. The attenuation formula of vibration velocity was derived by applying the attenuation formula of blasting energy. The results of the derivation formula were compared with those of a numerical simulation using FLAC3D software. The variation rule of vibration velocity and displacement at the joint of the tunnel surrounding rock and multi-arch tunnel during the blasting construction were analyzed. The results of the study indicate the following: The relative error between the results of theoretical calculation and numerical simulation of vibration velocity is small, which indicates that the formula for calculating the vibration velocity of the tunnel surrounding rock based on theoretical deduction is reliable; During blasting, energy propagates outward in the form of seismic waves; if a seismic wave arrives at the surface and is not fully attenuated, the energy will continue to attenuate in the form of reflected waves; During blasting construction, the maximum vibration velocity and displacement of surrounding rock are located in the surrounding rock of the arch roof of the excavated tunnel within 6 m from the face of the tunnel. Without supporting the tunnel, the vibration velocity of surrounding rock in the 8-m range of the tunnel vault is greater than 63.5 cm•s-1, which indicates damage. Therefore, it should be pre-reinforced before blasting construction. © 2019, Editorial Department of China Journal of Highway and Transport. All right reserved.
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页码：143 / 151and182
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