上部松动爆破对已建成邻近隧道影响分析
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摘要
结合重庆寸滩港区二期工程松动爆破的实际情况,应用数值模拟方法,模拟爆破松动作业对邻近寸滩隧道的影响问题,并进行了研究。结果表明,影响最严重的是已建成隧道的迎爆侧的侧墙、拱脚、拱顶等部位,施工中应对隧道迎爆侧进行重点监控;数值分析方法能很好地反映爆破荷载对隧道影响的变化规律。研究结论可为类似施工及现场监控量测提供参考。
Based on the practical situation of the second phase project of Cuntan Port tunnel, the influence of loosening blasting of it on an existing nearby tunnel was studied by means of numerical simulation. Results showed that, the most seriouly affected parts were the facing-blast wall, arch abutment, arch crown of the existing tunnel; the in -site monitoring should be focused on the facing -blast side of the existing tunnel; numerical simulation method can well describle the process of blast vibration on the existing tunnel. Conclusions are helpful for blasting control design, construction and in-situ monitoring of similar twin tunnels.
Based on the practical situation of the second phase project of Cuntan Port tunnel, the influence of loosening blasting of it on an existing nearby tunnel was studied by means of numerical simulation. Results showed that, the most seriouly affected parts were the facing-blast wall, arch abutment, arch crown of the existing tunnel; the in -site monitoring should be focused on the facing -blast side of the existing tunnel; numerical simulation method can well describle the process of blast vibration on the existing tunnel. Conclusions are helpful for blasting control design, construction and in-situ monitoring of similar twin tunnels.
引文
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