西山特长隧道斜井进入正洞交叉口施工技术

Construction of the Intersection Joint of the Xishan Super-long Tunnel with Inclined Shaft

太古高速公路西山特长隧道全长13.654 km,是国内目前在建最长的公路隧道。在斜井进入正洞交叉口的施工中,成功采用台阶法矩形断面垂直挑顶直接转入正洞施工方案,通过优化调整设计参数,采取加强支护、减震爆破等技术措施,实现了斜井安全、简便、快速地转入正洞的施工。

The 13.654km Xishan super-long tunnel on the Taiyuan-Gujiao expressway is the longest highway tunnel under construction in China.During construction of the intersection joint of the inclined shaft with the main tunnel,bench excavation was adopted with the rectangular-section vertical adit directly entering into the main tunnel.By optimizing the design parameters,strengthening support,and using shock-absorbing blasting technology,the construction of the inclined shaft intersection joint with the main tunnel was implemented safely and efficiently.