中文摘要：

为了统筹地铁区间隧道和车站施工,减少盾构施工中的非推进作业,提出在区间盾构隧道基础上扩挖双层地铁车站的结构施作方案(shield tunnel, cross鄄channel braced鄄frame, SCB),主要包括盾构隧道、横通道及框支结构等施作过程. 以北京地铁实际工程为背景,对该工法的施工特点及结构特性进行了分析,对车站行车隧道几何关系、盾构衬砌的分块设计及基坑支护等关键技术进行了研究,并将其施工工期及造价与原工程施工方案进行了对比分析. 研究结果表明,采用SCB 法修建的车站结构及施工方案可行,并可减少投入盾构机数量,提高盾构机的使用效率,有显著的工期优势与经济效益.

英文摘要：

In order to plan the subway station structure construction and the interval tunnel constructionas a whole, and to reduce non-promoting operation of the shield machine, an innovative subway stationstructure and its construction scheme named as SCB method, including several construction processessuch as shield tunnels, cross-channel, braced-frame and etc. , was developed based on the interval shieldtunneling. Taking a practical engineering of Beijing Subway as the background, the construction featuresand the structure characteristics with SCB method were analyzed. Several key techniques, such as thegeometrical relationship between the running tunnel and the station structure, the segment design of theshield tunnel lining and the retaining structure of the foundation pit, were researched and developed. Theconstruction period and cost with SCB method was compared with that by the original constructionscheme. The study shows that the station structure and construction scheme with SCB method is feasible,the number of the shield machine to be equipped is reduced and the service efficiency of the shieldmachine is improved, and the structure and construction scheme with SCB method will have significantadvantages in the construction period and cost.