并设小净距隧道爆破振动响应分析及控爆措施研究

通过大量二维、三维数值模拟计算，分析了围岩、净距、埋深等条件对小净距隧道爆破振动特性的影响，研究了先行隧道不同支护体系、不同中岩墙加固措施及后行隧道不同施工方案等情况下，小净距隧道中后行隧道爆破开挖对先行隧道的影响。根据研究结果，提出了中岩墙加固宜采用注浆加固、先行隧道初期支护宜及时跟进并封闭、掏槽眼宜远离中岩墙以及开挖进尺不宜大于净距的1/3等小净距隧道爆破施工的控爆措施，以供小净距隧道爆破开挖设计、施工借鉴。

Analysis of blasting vibration response of parallel set small clear-distance tunnels and blasting control measures

Effects of surrounding rock, clear-distance and buried depth on blasting vibration characteristics of small clear-distance tunnel are analyzed by two and three-dimensional numerical simulations; and effects of blasting in lately excavated tunnel on early excavated tunnel are studied for different support systems, reinforcement measures of middle wall of early excavated tunnel and different construction plans of lately excavated tunnel. According to research results, such blasting control measures of tunnel construction are provided that middle wall should be reinforced by grouting, and primary support of early excavated tunnel should be closed down in time; and hole cut should be far away from middle wall and advance should not greater than one-third of clear-distance. All measures can be for reference in design and construction for blasting excavation of small clear-distance tunnels.