为解决高铁明挖隧道与机场综合交通换乘中心（简称GTC）、航站楼共构的设计难题，依托津潍高铁济南联络线（简称济滨高铁）机场2号隧道下穿GTC、遥墙机场T2航站楼工程，针对紧邻运营机场、直接承受上部超大荷载、隧道结构形式多变、地下水位高、地基承载力低等特点，通过调研、对比分析、数值模拟、现场实测等方法，对机场2号隧道与GTC、航站楼共构段的设计方案进行研究。结果表明： 1）分区分段采用混凝土桁架撑+对撑+钢支撑+钢支撑伺服系统的联合支护方式可有效控制“喇叭口”形状的深大基坑变形，并提高基坑开挖效率； 2）采用上部结构设置转换梁的方案，有利于隧道结构受力，便于荷载传递，从而可以减小隧道结构尺寸，节约工程投资； 3）多箱直墙平顶圆拱的隧道结构，可解决上部直接承受超大荷载的大跨隧道结构设计难题； 4）隧道底部采用长短桩均匀布置的方案，能有效控制隧道结构的沉降变形。

The common structure section between high-speed railway tunnel and airport poses great challenge to design work. The Airport No. 2 tunnel on the Jinan-Binzhou high-speed railway crosses underneath the ground traffic center (GTC) and Terminal 2 of Yaoqiang airport in Jinan, China, and faces various challenges, such as close to the airport, excessive upper loads, varying tunnel structures, high underground water level, and low foundation bearing capacity. Through data investigation, comparative analysis, numerical simulation, and on-site measurement, the design scheme of the co-constructed section of Airport No. 2 tunnel, GTC, and Terminal 2 is studied. The findings include: (1) The combined support method of using concrete trusses, diagonal bracing, steel supports, and steel support servo systems in a zoned and segmented approach effectively controls the deformation of the "horn-shaped" deep foundation pit and enhance the efficiency of pit excavation. (2) The scheme of using transfer beams in the upper structure facilitates the stress distribution of the tunnel structure and load transmission, thus reducing the size of the tunnel structure and save engineering investment. (3) The circular arch structure with multiple boxes straight wall flat top bears super large loads. (4) The scheme of uniformly arranging long and short piles at the bottom of the tunnel effectively controls the settlement and deformation of the tunnel structure.