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Study on Induced-blasting Damage of Covering Rocks in Submarine Tunnel Construction
Author(s): 
Pages: 56-62
Year: Issue:  3
Journal: Journal of Shandong University of Science and Tech

Keyword:  爆破振动 损伤范围 覆盖岩石 海底隧道;
Abstract: 海底隧道掘进爆破开挖岩石的过程中,爆破振动必然会对隧道覆盖岩石造成损伤和破坏,危及隧道施工安全。阐述了质点峰值振动速度临界值作为爆破围岩损伤的判别标准和作用于炮孔壁上爆炸脉冲荷载计算公式。以青岛胶州湾隧道为背景,采用Abaqus软件,对周边眼爆破振动的覆盖岩石动力响应进行数值模拟,并对计算结果按照最小二乘法进行拟合,得到覆盖岩石质点峰值振动速度衰减公式。按质点峰值振动速度判别标准计算出了周边眼爆破引起的覆盖岩石损伤范围仅为0.3581 m。研究表明采用低爆速炸药、不耦合间隔装药光面爆破技术,爆破对海底隧道覆盖岩石损伤范围较小。
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