Affiliation:
1. School of Resources and Safety Engineering, Central South University, Changsha 410083, China
2. Guangxi Xinfazhan Communication Group Co., Ltd., Nanning 530029, China
Abstract
The number of excavated tunnels is increasing day by day, and the corresponding engineering scale is also getting increasing. Safe, efficient, and economically beneficial tunnel construction methods are indispensable in the process of crossing mountains and steep ridges in the southwest region. However, behind the improvement of transportation infrastructure in Southwest China is the support provided by the rapid development of blasting industry engineering technology in China. In the process of tunnel construction using the drilling and blasting method, in addition to blasting vibration disasters the phenomenon of overbreak and underbreak caused by blasting construction is a prominent problem. This phenomenon not only affects the safety and stability of the tunnel excavation but also seriously increases the construction cost. Based on a short mountain hard rock tunnel project in southwest China, this paper studies the effect of blasting construction on the blasting vibration of adjacent structures and the influence of tunnel contour forming quality. Through the monitoring and analysis of in situ blasting vibration, the Sadowski formula is used to study the attenuation law of blasting vibration velocity in different tunnel sites, which provides a theoretical basis for tunnel blasting vibration control. This article compares the use of overbreak and underbreak value with the traditional method to determine the degree of overbreak and underbreak. It introduces the analysis of contour section fractal dimension value and uses fractal theory in the Python image processing module to accurately and quantitatively describe the problems of tunnel overbreak and underbreak. The feasibility and accuracy of this method have been verified, by combining the total station and 3D laser scanner results of overbreak and underbreak measurements of the Brenner Base Tunnel and a short hard rock tunnel in a mountainous area of southwestern China. The blasting scheme was optimized from the aspects of cut hole form, detonator interval time, and peripheral hole charge structure, and the rationality of the optimized scheme was verified according to the on-site blasting experiments. It has a profound influence on strengthening the protection of adjacent tunnel structures and improving the economic benefit of mountain highway projects.
Funder
the Key science and technology project of the Guangxi transportation industry
Guangxi Key R&D Program Project
Reference54 articles.
1. A newly developed blasting cut in tunnels; application of “combined method” in small to medium-sized tunnels;Kumar;Tunn. Undergr. Space Technol.,2023
2. Propagation Characteristics of Explosion Wave and Explosion Gas in Blast-Hole;Zuo;Shock Vib.,2023
3. Dynamic responses and failure mechanisms of the existing tunnel under transient excavation unloading of an adjacent tunnel;Xu;J. Rock Mech. Geotech. Rock Eng.,2023
4. Ren, K., Jiang, A.N., Guo, X.P., and Min, Q.H. (2023). Research on Optimization Design of Tunnel Blasting Scheme Adjacent to Buildings. Appl. Sci., 13.
5. Monitoring and Analysis of Blasting Vibration in Daxuanling Tunnel with Small Clear Space;Liu;Blasting,2008
Cited by
2 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献