【摘要】 以重庆至怀化线增建工程中的复线隧道为研究对象,对小间距铁路隧道复线洞口段爆破开挖产生的动力效应进行了数值模拟,给出了爆破开挖在既有洞室洞口周边产生的动力效应的一般规律。研究结果表明:加强对敏感部位监控、采用合理爆破参数可有效减轻爆破应力波对既有隧道洞口段的不利影响。更多还原

【Abstract】 Taking the double-track railway tunnel on Chongqing-Huaihua railway as the background,numerical simulation was carried out to study the blasting vibration effect on the portal section of closely-spaced tunnels.General regulations of dynamic effects caused by blasting excavation on the existing tunnel perimeter were acquired.Results of the study indicated that unfavorable influence of blasting waves on the portal section could be alleviated by enforcing the monitor for sensible parts and by reasonable selection of blasting parameters.更多还原