中文摘要：

目前尚无地下车站主体结构分幅施工的先例,也没有此种情况下明确的不均匀沉降控制标准。兰州中川机场地下车站采取主体结构分幅施工,通过调研相关规范与文献,制定该地下车站不均匀沉降控制标准。采用FLAC3D软件,分析不考虑结构顶部回填土和考虑结构顶部回填土2类共7种工况下的地基不均匀沉降变形潜势及车站结构受力情况。结果表明：兰州中川机场地下车站变形潜势可分为安全、单指标预警、双指标预警、临界（一指标达到即可）、超限（一指标达到即可）等5个级别;对不均匀沉降而言,设后浇带左右半幅施工在施工期和长期均有利。对结构受力而言,设后浇带左右半幅施工在施工期有利,但对长期受力不利,推荐采用不设后浇带左右半幅施工方案;砂质黄土条件下地下车站主体结构不同施工工况变形潜势差异明显,左右半幅2种工况分别出现双指标预警和单指标预警的变形潜势等级。

英文摘要：

At present,there is no semi construction experience and settlement control standard for main structure of underground station. The main structure of Lanzhou Zhongchuan Airport Underground Station is constructed by semi construction method; and the uneven settlement standards for the underground station should be settled according to relevant standards and documents. The uneven deformation rules of the foundation and the stress of the station structure are analyzed under 7 conditions of the station structure with and without top roof backfill by software FLAC3 D. The study results show that： 1） The deformation potentials can be classified into 5 levels,i. e. safety,single index warning,double index warning,critical state（ as long as one index reached） and ultralimit（ as long as one index reached）. 2）The semi construction with post-cast strip is good for uneven settlement control during construction period and following long term. It is also good for structural stress during construction period but not for structural stress in long term. As a result,the semi construction without post-cast strip is recommended. 3） The deformation potentials of underground station in sandy loess under different working conditions vary obviously. The double index warning and single index warning occur under working conditions of semi construction.