Vibration Safety Threshold and Control Technology for Blasting to Prevent Seawater Intrusion in Coastal Tunnel Sections Near Faults

IF 2.7 3区 地球科学 Q1 ENGINEERING, MARINE Journal of Marine Science and Engineering Pub Date : 2024-09-14 DOI:10.3390/jmse12091646
Xiaodong Wu, Xiaomeng Miao, Min Gong, Junpeng Su, Yaqi Zhu, Xiaolei Chen
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Abstract

Coastal underground engineering projects are prone to seawater intrusion during blasting operations, posing significant risks to the safety of construction personnel and the structural integrity of the projects. To ensure the safety of blasting operations in areas at risk of seawater intrusion, this study focuses on a section of a coastal tunnel that is at risk of such intrusion. Using fracture mechanics theory and silo theory analysis methods, the minimum safe distance between the workface and the fault to prevent seawater intrusion is determined. Numerical simulations are employed to analyze the dynamic response of the surrounding rock and the attenuation of vibrations as blasting excavation progresses near the fault-controlled zone. This study also explores the impact of dynamic excavation on fault stability. By employing a regression analysis, this study establishes quantitative relationships between the amount of explosive used and the peak particle velocity (PPV) at different distances, as well as between the range of rock damage and PPV at various distances. This analysis allows for the determination of a safe PPV threshold to prevent seawater intrusion in the fault-controlled area. The accuracy of the computational model is validated using field-measured data. Finally, an optimized blasting design and strategy based on electronic detonator initiation are proposed for the control area, ensuring construction safety. This study provides theoretical and technical references for achieving safe and efficient blasting excavation in coastal underground engineering projects.
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防止断层附近海岸隧道段海水入侵的爆破振动安全阈值和控制技术
沿海地下工程在爆破作业过程中容易受到海水入侵,对施工人员的安全和工程结构的完整性构成重大风险。为确保在有海水入侵风险的区域进行爆破作业的安全性,本研究重点关注有海水入侵风险的一段沿海隧道。利用断裂力学理论和筒仓理论分析方法,确定了工作面与断层之间防止海水入侵的最小安全距离。利用数值模拟分析了断层控制区附近爆破开挖过程中围岩的动态响应和振动衰减。本研究还探讨了动态开挖对断层稳定性的影响。通过采用回归分析,本研究确定了炸药用量与不同距离的峰值颗粒速度(PPV)之间的定量关系,以及岩石破坏范围与不同距离的峰值颗粒速度之间的定量关系。通过分析,可以确定一个安全的 PPV 临界值,以防止海水侵入断层控制区。计算模型的准确性通过现场测量数据得到验证。最后,为控制区提出了基于电子雷管起爆的优化爆破设计和策略,以确保施工安全。这项研究为实现沿海地下工程安全高效的爆破开挖提供了理论和技术参考。
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来源期刊
Journal of Marine Science and Engineering
Journal of Marine Science and Engineering Engineering-Ocean Engineering
CiteScore
4.40
自引率
20.70%
发文量
1640
审稿时长
18.09 days
期刊介绍: Journal of Marine Science and Engineering (JMSE; ISSN 2077-1312) is an international, peer-reviewed open access journal which provides an advanced forum for studies related to marine science and engineering. It publishes reviews, research papers and communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced. Electronic files and software regarding the full details of the calculation or experimental procedure, if unable to be published in a normal way, can be deposited as supplementary electronic material.
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