盾构隧道近接既有房屋建筑的掘进施工具有不确定因素多和变形控制难等特点。本文采用有限差分软件FLAC3D建立三维地质模型，重点分析盾构隧道、地层、开挖工况下各自的施工力学行为，结果表明：盾构开挖完成后，盾构隧道中心线处地面沉降最大值为4.51 mm，盾构隧道中心线左右24.4 m为地表沉降影响范围；衬砌结构周围土体沉降约为15.5~16.6 mm，为控制隧道围岩土体损失，需加强盾尾注浆及二次注浆等施工措施。研究成果可为乌市相似地质环境的盾构近接建筑物的施工提供一定参考。
The tunneling construction of shielded tunnels adjacent to existing buildings has many uncertainties and difficult deformation control. In order to analyze the construction mechanical properties of the shield adjacent to existing buildings, a three-dimensional model of shield tunnel, stratum and adjacent existing buildings was established. The large-scale geotechnical software FLAC3D was used to simulate the whole process of the adjacent construction. The numerical analysis results show that after the completion of the left and right lines of the shield, the maximum settlement of the ground is about 4.51 mm, and the influence of the ground subsidence is within 24.5 m of the center line of the tunnel. The settlement of the soil around the lining structure is about 15.5 - 16.6 mm. In order to control the soil loss of the surrounding rock of the tunnel, it is necessary to strengthen the construction measures such as shield tail grouting and secondary grouting. The research results can provide a reference for the construction of shielded adjacent buildings in the similar geological environment of Urumqi.
Mroueh, H., et al. (2003) A Full 3-D Finite Element Analysis of Tunneling-Adjacent Structures Interaction. Computers and Geotechnics, 30, 245-253. https://doi.org/10.1016/S0266-352X(02)00047-2
