北京地铁4#线西单站施工方案比选

Preferred Construction Solution for Xidan Station Engineering on Line 4 # of Beijing Subway

针对北京地铁4#线西单车站，提出盖挖顺作和盖挖逆作2种施工方案．分别给出这2种方案的围护结构设计参数和施工方法，分析了各自的优缺点；经过技术、经济、环境等方面的比较，选择了盖挖逆作方案，并给出了盖挖逆作施工工法．该车站选择盖挖逆作施工方法，施工造价略有增加，但降低了施工对环境的干扰，减少了对地面交通的影响，实践证明该方法安全可行．

Alternative construction solutions, including cut-and-cover method and cover-and-cut reverse method, are proposed for Xidan station engineering on Line 4# of Beijing subway. Design parameters and construction methods for the retaining and support structures are given, respectively; and their advantages and disadvantages are analyzed. Cover-and-cut reverse method is selected as the preferred construction solution based on the comparison of technology, economy and environment. The construction method about the coverand-cut solution are erected Although the preferred solution costs a little more than the alternative one, the construction scheme will have little effects from surroundings and the influence to transportations on the ground surface will be reduced. It is verified through practice that the cover-and-cut reverse method is safe and feasible.