新建引水隧洞下穿既有铁路隧道爆破施工影响研究

摘要

根据左权县西安村水电站1号引水隧洞下穿既有阳涉铁路半坡2号隧道工程实例,结合经验公式法和三维数值模拟计算方法,对引水隧洞下穿既有铁路隧道的爆破施工影响进行研究,分别得出引水隧洞控制爆破范围和既有铁路隧道受影响区段及变形规律,提出引水隧洞爆破施工时既有铁路隧道的处理措施,以确保既有铁路隧道衬砌结构和列车运行的安全.%In this paper, the project of No. 1 water diversion tunnel at the hydropower station in Xi'an village of Zuoquan County are taken as an example, which passes below the existing No. 2 Banpo Tunnel of Yangquan-Shexian Railway. By using the empirical formula and numerical calculation method, this paper gives an analysis of the influence of the blasting construction of the new water diversion tunnel passing below the existing railway tunnel. Then, some technical parameters are obtained, including the control range of the blasting of the water diversion tunnel, the affected zones and the deformation rule of the existing railway tunnel. Finally, the paper offers the protective measures for the existing railway tunnel in the process of constructing of the water diversion tunnel so as to ensure the safety of the lining structure and train operation on the existing railway tunnel.