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某隧道因突泥涌水故增设泄水洞,泄水洞水文地质复杂,下穿一条既有线铁路无砟轨道,二条既有线有砟轨道,泄水洞拱顶开挖线与既有隧道仰拱底开挖线净距为5米,被视为该条铁路线第一风险,设计为非爆破开挖,因隧道尺寸小无法使用机械开挖,申请采用电子数码雷管错相减震爆破工艺,经成都铁路局和专家组对此方案的爆破参数、振速以及各类监测和防护措施等各方面进行了论证同意实施控制爆破,最终在实践过程中取得了良好的效果,研究的结论和实践经验对同类工程有较好的借鉴作用。
A tunnel due to sudden muddy water so the addition of additional drainage holes, drainage holes hydrogeological complex, under an existing rail line ballastless track, two existing lines have ballast tracks, drainage tunnel vault excavation line and the existing tunnel inverted arch The bottom of the excavation line spacing of 5 meters, is considered the first risk of the railway line, designed for non-blasting excavation, due to the small tunnel size can not use mechanical excavation, the application of electronic digital detonator phase damping blasting process, Through the Chengdu Railway Bureau and the Group of Experts on this program blasting parameters, vibration velocity and various monitoring and protective measures and other aspects of the demonstration agreed to the implementation of controlled blasting, and ultimately achieved good results in practice, the conclusions and practice of the study Experience of similar projects have a good reference.