重庆北站大断面立体交叉段施工技术研究

Research on the Construction Technology of Large Cross Section of Chongqing North Railway Station

研究目的:近距离交叉隧道修建带来的挑战日益增多,本文依托重庆北站10号线与环线交叉换乘车站工程,运用数值计算、理论分析、现场监测数据等手段,对应力、变形及实测数据进行对比分析,从而确定合理的施工方案,为类似地铁工程建设提供参考。研究结论:(1)在3个备选方案中选择了方案一:10号线先开挖,且10号线二次衬砌先施作;(2)对方案一的交叉段进行数值模拟,最大沉降及最大隆起分别为8.2 mm和4.04 mm,都没有超过安全值;(3)实测数据表明,地表建筑物沉降最大值为1.30 mm,净空收敛最大值为12.53 mm(爆破扰动),拱顶最大沉降为7.76 mm,可见采用方案一开挖交叉段可以很好地控制隧道围岩的稳定性,进一步验证了选择方案一的合理性;(4)该成果可供重庆地铁车站等类似地铁车站的施工参考。

Research purposes： The challenges caused by the construction of the near distance cross tunnel are increasing. Relying on the Chongqing North Railway Station line 10 and loop line cross transfer station project, this paper makes a comparative analysis of the stress, deformation and measured data, by means of numerical calculation, theoretical analysis, and field monitoring data, to determine the reasonable construction scheme, to provide reference for similar subway projects. Research conclusions： （ 1 ） We chose the first scheme in three alternatives ： that is line 10 first excavation and followed by line 10 lining. （2） By the numerical simulation of a cross section of the program, the maximum settlement and the maximum uplift were 8.2 mm and 4.04 ram, which are not more than the safety range. （3） The measured data shows that the ground building maximum settlement value is 1.30 ram, the maximum convergence value is 12.53 mm （ blasting disturbance） , the maximum settlement of crown is 7.76 mm. The stability of tunnel surrounding rock can be well controlled by the method of excavation cross section, which further verifies the rationality of the selection scheme. （4） The research results can provide reference for the construction of Chongqing Metro station and other similar metro station.