敞口式盾构在北京地区的适用性分析

通过介绍敞口式盾构主要结构、工作原理、施工步骤，结合敞口式盾构确保开挖面土体稳定，具有较好的经济性、进度指标、特殊应对功能及风险应对能力等特点，对敞口式盾构针对北京地区地层条件的适用性进行了研究分析，认为敞口式盾构在北京地区隧道施工具有一定的适用性，并值得推广。

Analysis on Applicability of Open Shields in Beijing Area

The main structures, working principles and construction procedures of open shields are presented. In case open shields are used, the stability of the soil mass of the excavation face can be guaranteed. Open shields have such features as good economical efficiency, good construction progress rate, good special situation coping functions and good risk controlling capability. Analysis is made on the applicability of open shields in the geological conditions in Beijing area. The study shows that open shields can meet the requirements of the tunnel construction in Beijing area and are worth to be popularized.