根据工程类比法，采用CRD法优化厦门机场下穿34号楼隧道工程施工步骤。借助数值分析方法，分析既有建筑的沉降规律；根据现场实测及数值模拟结果，提出超前注浆、地面硬化及补偿抬升注浆、洞内全断面帷幕注浆、大管棚超前支护等多种施工辅助措施控制沉降，结果表明施工过程既有建筑结构沉降得到有效控制，最终沉降量小于40mm。

Wutongshan tunnel of Jichang Road project in Xiamen, China, which crosses underneath No. 34 building, is constructed by CRD method. The construction procedure of the tunnel is optimized by engineering analogy method. The settlement rule of the existing building is analyzed by numerical analysis method. Assistant construction measures, such as advance grouting, surface concrete paving, compensation grouting, fullface curtain grouting and advance reinforcement by large pipe roof, are proposed on basis of the measured settlement values and simulated settlement values. In the end, the settlement of the building caused by tunnel construction is effectively controlled, with the final settlement being less than 40mm.