新型PBA工法初期支护施工地层沉降规律研究——以北京某地铁站为例

PBA（Pile-Beam-Arch）工法施工过程中地层沉降主要集中在初期支护施工过程。新型PBA车站是在传统单层4导洞PBA车站的基础上，将中间导洞联合，共用中隔壁，形成由CD法（中隔壁法）施工的大断面，初期支护施工过程地层沉降规律难以掌握。为了研究地层新型PBA车站初支施工过程地层沉降规律，依托北京采用新型PBA工法施工的某地铁车站，运用Peck理论、有限元数值分析和现场监测相结合的方法，对该车站新型PBA工法初期支护施工过程地层沉降规律进行分析。研究成果可为今后相同车站施工提供借鉴。

Study on the Formation Settlement Rule in the Initial Support Construction of the New PBA Construction Method：Taking a Subway Station in Beijing as an Example

During the construction process of the PBA(pipe beam arch) method, the settlement of the strata is mainly concentrated in the initial support construction process. The new PBA station is based on the traditional single-layer 4-guide tunnel PBA station, combining the middle guide tunnel and sharing the middle partition to form a large cross-section constructed by the CD （center diaphragm）method. The law of strata settlement during the initial support construction process is difficult to grasp. In order to study the settlement law of the strata during the initial support construction process of the new PBA station, relying on a subway station constructed by the new PBA method in Beijing, the Peck theory, finite element numerical analysis, and on-site monitoring methods are combined to study and analyze the settlement law of the strata during the initial support construction process of the new PBA method at the station. The research findings can provide reference for the construction of similar stations in the future.