硬岩地层地铁盾构区间联络通道控制爆破技术
傅鑫晖1姚元辉2刘常涛1赵红岗2肖翔3覃坚鹏3
Controlled Blasting Technology for Connection Passage between Metro Shield Sections in Hard Rock Stratum
FU Xinhui1YAO Yuanhui2LIU Changtao1ZHAO Honggang2XIAO Xiang3QIN Jianpeng3
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作者信息:1.福建农业职业技术学院，350119，福州
2.中建海峡建设发展有限公司，350015，福州
3.中国建设基础设施有限公司，100029，北京
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Affiliation:1.Fujian Vocational College of Agriculture, 350119, Fuzhou, China
2.CSCEC Strait Construction and Development Co., Ltd., 350015, Fuzhou ,China
3.China Construction Infrastructure Co., Ltd., 100029, Beijing, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.09.026
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中图分类号/CLCN:U455.6
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栏目/Col:研究报告
摘要:
［目的］硬岩地层的联络通道施工目前尚未形成较为系统、成熟且快速的开挖施工工法。全断面硬岩中，区间联络通道断面小、操作空间有限，采用常规方法进行施工时效率较低，且存在较大的施工风险。为此，应对硬岩地层地铁盾构区间联络通道控制爆破技术进行深入研究。［方法］以福州地铁4号线某盾构区间联络通道为案例，提出了适用该项目的联络通道控制爆破技术。根据该项目的工程特点，对一次爆破最大单段药量所需的计算参数值进行了设置，根据设计联络通道与被保护对象间距离的远近，计算得到了3个等级的最大单段药量，进而提出了炮孔设计方案、装药结构方案及装药堵塞方案。选取了该联络通道上方地面的6个沉降观测点，得到了这6个测点在施工期间的地面沉降曲线，用以分析爆破施工对地面沉降的影响。［结果及结论］施工过程中制定的预留保护层、变岩体为岩墙、浅孔微分爆破、数码微差起爆等措施，有效地减小了爆炸冲击，降低了爆破振动，实现了该工程安全爆破、快速开挖的预期目标。
Abstracts:
［Objective］ At present, a relatively systematic, mature and rapid excavation construction method for the connection passage construction in hard rock stratum has not been formed yet. Due to the small cross-section and limited operating space in the connection passage, construction with the conventional construction method is less efficient with significant construction risks. Therefore, it is necessary to conduct in-depth study on the technology of controlled blasting in the connection passage of metro shield section in hard rock stratum. ［Method］ Taking the connection passage in a shield section of Fuzhou Metro Line 4 as a case study, the controlled blasting technology suitable for this project is proposed. According to the engineering characteristics of the project, the calculating parameters required by the maximum single blast charge for a single-section are set up. In addition, based on the distance between the designed connection passage and the objects to be protected, three levels of maximum single-section charges are calculated, and the schemes for blasting hole design, charge structure design and charge blockage are proposed. Six ground settlement measuring points are selected on the ground above the connection passage, and the settlement curves of the six points during construction are obtained to analyze the influence of blasting on ground settlement. ［Result & Conclusion］ The measures of reserving protection layers, treating rock masses as rock walls, shallow hole differential blasting, and digital micro-difference initiation being taken in the process of construction, effectively reduce the explosion impact and blasting vibration, achieving the preset goal of safe blasting and rapid excavation.
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