在当今城市化高速发展的背景下，交通拥堵问题已成为制约城市经济进一步发展的瓶颈。地铁作为一种安全可靠、准时方便、舒适的交通方式，成为解决城市交通拥堵问题的重要手段。本书深入探讨了地铁车站施工中的多种方法及其对周边环境的影响，以具体工程施工为例，结合模型试验、理论分析和数值模拟等手段，研究了洞桩（PBA）法在开挖车站时引起的周边既有结构变形特点等问题，探讨了洞桩法在地铁施工中的地位和意义，以及其对地下工程的影响。
全面涵盖：本书涵盖了地铁交通的历史发展、不同施工方法、环境影响等多个方面，为读者提供了全面的了解。
理论与实践相结合：通过模型试验、理论分析、数值模拟等多种方法，将理论知识与实际案例相结合，使内容更具可操作性和实用性。
深入研究：本书对洞桩法在地铁施工中的地位、意义、影响等问题进行了深入研究，使读者有了深刻的认识。
前瞻性思考：通过对不同施工方法的分析，本书提出了关于地铁交通未来发展的前瞻性思考，引导读者对城市交通发展有更深入的了解。

1 Introduction
1.1 Research background
1.2 Research status of PBA method
1.3 Research significance
2 State of the art
2.1 Cut and cover method
2.2 Cover-cut method
2.3 New Austrian tunneling method
2.4 Shield method
2.5 Both sides heading method
2.6 Center drift method
2.7 NTR method
3 Introduction to PBA construction method
3.1 Pile-beam-arch(PBA) method
3.1.1 Principle of PBA method
3.1.2 Characteristics of the PBA method
3.1.3 Construction steps of the PBA method
3.1.4 Structural form of the PBA method
3.2 Selection of construction methods for subway stations
3.2.1 Comparison of construction methods
3.2.2 Construction method selection
4 Main structure construction of PBA method
4.1 Guide tunnel construction method
4.1.1 Small catheter support
4.1.2 Guide tunnel excavation
4.1.3 Construction of large pipe shed
4.2 Construction of bored piles at the side of the station
4.2.1 Preparation
4.2.2 Mechanical drilling construction
4.2.3 Construction of steel bars
4.2.4 Concrete pouring construction
4.3 Crown beam construction method
4.3.1 Preparation
4.3.2 Reinforcement formwork construction
4.3.3 Crown beam concrete construction
4.4 Bottom longitudinal beam construction method
4.4.1 Substrate treatment
4.4.2 Waterproof construction
4.4.3 Reinforcement installation
4.4.4 Installation of embedded parts
4.4.5 Concrete construction
4.5 Steel pipe column construction method
4.5.1 Manual digging pile construction
4.5.2 Steel pipe column construction
4.6 Top longitudinal beam construction
4.6.1 Formwork construction
4.6.2 Waterproof layer construction
4.6.3 Steel banding
4.6.4 Concrete infusion
4.7 Arch construction method
4.7.1 Arch construction steps
4.7.2 Initial support construction of arch
4.7.3 Earthwork excavation
4.7.4 Secondary lining construction of arch
4.7.5 Formwork construction
4.7.6 Concrete construction
4.8 Excavation of the subway station
4.8.1 Soil excavation
4.8.2 Shotcrete construction between piles
4.8.3 Medium plate and side wall construction
4.8.4 Platform wall and board construction
5 3D model simulation of construction steps of PBA method
5.1 Introduction to GTS NX
5.2 Constitutive model of geotechnical
5.2.1 Elastic model
5.2.2 Elastoplastic model
5.2.3 Model assumptions
5.3 Establishment of the subway station model
5.3.1 Setting of boundary conditions
5.3.2 Simplification of the PBA process
5.3.3 Mechanical parameters of the material
5.3.4 Simplification of model loads
5.4 Simulation of guide tunnel excavation scheme
5.4.1 Scheme 1 for guide tunnel excavation
5.4.2 Scheme 2 for guide tunnel excavation
5.4.3 Scheme 3 for guide tunnel excavation
5.4.4 Scheme 4 for guide tunnel excavation
5.5 Simulation of the excavation process
5.5.1 Construction of small conduits
5.5.2 Construction of small guide tunnels
5.5.3 Construction of beam and column system
5.5.4 Initial support of the arch
5.5.5 Secondary lining of the arch
5.5.6 Construction of the middle plate and side walls
5.5.7 Construction of the platform
5.6 Simulation analysis of tunnel excavation scheme
5.6.1 Guide tunnel excavation scheme model
5.6.2 Analysis of arch settlement of scheme 1
5.6.3 Analysis of arch settlement of scheme 2
5.6.4 Analysis of arch settlement of scheme 3
5.6.5 Analysis of arch settlement of scheme 4
5.6.6 Comparative analysis of arch settlement
5.6.7 Comparison of surface settlement
5.7 Analysis of ground surface settlement in subway station
5.7.1 Stage of small guide tunnel construction
5.7.2 Stage of pile and beam system construction
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