浅埋隧道下穿高铁隧道设计方案探讨

Exploration on the Design Scheme for Shallow Buried Tunnel Undercrossing High-speed Railway Tunnel

文章以巫溪支线柏树林隧道下穿郑万高铁小田坪隧道交叉影响共建段为例,根据线路不同结构净距方案,采用了在郑万高铁隧道内设置竖井方案和在巫溪支线内加强支护方案,并从共建长度、施工工期、施工干扰、后期施工及总投资五个方面加以对比,得出在工期允许情况下,交叉处距离洞口200 m范围内宜采用下部隧道支护加强方案,超过200 m则宜采用竖井方案,为日后交叉共建隧道的设计方案提供参考。

Taking the cross co-construction section of Baishulin Tunnel on Wuxi branch line undercrossing Xiaotianping Tunnel on Zhengzhou-Wanzhou High-speed Railway as an example,according to the clear distance scheme of different structures of the line,the scheme of setting shaft in the tunnel of Zhengzhou-Wanzhou Highspeed Railway and the scheme of strengthening support in Wuxi branch line are adopted,and the comparison is made from five aspects:co-construction length,construction period,construction interference,later construction and total investment.It is concluded that when the construction period is allowed,the lower tunnel support reinforcement scheme should be adopted within 200 m from the entrance of the tunnel,and the shaft scheme should be adopted when the distance is more than 200 m,which provides a reference for the design scheme of cross-construction tunnel in the future.