中文摘要：

以北京地铁4号线动物园车站施工工程为例，研究采用盖挖逆作法施工时地铁车站结构变形的规律及其控制措施。采用Midas有限元计算软件对施工过程中车站结构变形进行模拟分析可知，在盖挖逆作施工过程中地层及结构动态力学响应可划分为5个卸载-加载过程。因此，基于变位分配原理，提出车站施工过程的分阶段控制方法。施工前，依据车站结构受力特点和破坏形式，通过模拟计算确定出各主要施工阶段车站结构差异沉降控制标准值，同时通过中桩静载及内力试验，保证结构自身具备足够的承载能力和抗变形能力；施工过程中，按照地层协调开挖、结构协调施作来优化施工工序，综合应用沉桩工艺控制与注浆加固等技术措施，利用信息化监测及反馈技术进行阶段性动态监控，实现车站结构变形的有效控制。实际监测结果表明，动物园车站在盖挖逆作施工过程中，各阶段结构差异沉降均在控制值之内，保证了车站结构的安全性和稳定性。

英文摘要：

Taking the construction engineering of the Zoo Station of Line 4 in Beijing Metro for example, the research was made on the deformation laws and its control measures of the station constructed by cut and cover reverse method. Structural deformation of the station during the construction process was simu- lated by Midas finite element method, and then the mechanical dynamic response of the stratum and structure in the whole construction process by cut and cover reverse method was divided into five ＂unloadingloading＂ phases. So, based on the deformation distribution method, ＂the whole process and stage control method＂ was put forward. In pre-construction stage, according to the stress characteristics and damage form of the station structure, structural differential settlement control standard values of the main construction stage were determined by back analysis. At the same time, king-pile static load and internal force test were carried out to make it have enough carrying capacity and non-deformability. During the construction stage, according to the stratum coordination excavation, structural coordination construction, the construction process was optimized. ＂Pile-sinking technology control＂ and ＂Grouting reinforcement＂ were synthetically used and the information monitoring and feed-back technology were adopted to realize station structural control. Actual monitoring results show that all construction stages differential settlement of Zoo Station has been controlled within the proper range to make the station structure safe and stable.