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因2015年雨季兰渝高铁龙凤隧道内地下水涌出,致其停运,故在线下增建泄水洞,要求必须在2016年雨季前贯通。该泄水洞距上方运营高铁仅5 m,为保证高铁的运营安全,对爆破振速控制要求极为严格。介绍了此工程中所采用的爆破方法、爆破参数和起爆方式,并最终引入了电子雷管错相减振技术以及相应的起爆时差。由于施工区域地质复杂,围岩等级较高,岩石硬度大。通过试爆段的多次爆破监测数据显示,爆破振速以及主频都远远大于一般类似工程。传统非电毫秒延时方式已彻底无法满足工程要求,普通电子雷管逐孔起爆方法亦无法使得振速得到有效控制,所以最终采取了数码电子雷管错相减振技术。施工过程表明,电子雷管错相减振方式的工程爆破效果良好,减振效果明显,保证了泄水洞如期贯通,避免了高铁再次因雨停运。可为类似的工程作为参考。
Due to the flooding of groundwater in the Longfeng Tunnel of Lanzhou-Chongqing High Speed Rail in 2015, it was suspended. Therefore, a drainage tunnel was to be built under the line. The requirement must be met before the rainy season in 2016. The tunnel is only 5 m above the high-speed rail operated. In order to ensure the safe operation of the high-speed rail, the blasting speed control is extremely strict. The blasting methods, blasting parameters and detonating methods adopted in this project are introduced. Finally, the phase deactivation technology of electronic detonators and the corresponding time lag are introduced. Due to the complex geological conditions in the construction area, the surrounding rock has a high grade and the rock has a large hardness. Explosion through the test section of the number of blasting monitoring data show that the blasting speed and frequency are much larger than similar projects in general. Traditional non-millisecond time delay has been completely unable to meet the engineering requirements, the common electronic detonator hole-by-hole initiation method can not make the effective control of the vibration speed, so the final take the digital electronic detonator phase damping technology. The construction process shows that the engineering detonation effect of the electronic detonator in phase-by-phase damping mode is good and the vibration damping effect is obvious, ensuring that the drainage hole goes through as scheduled, thereby avoiding the high-speed rail being shut down again due to rain. For similar projects as a reference.