The accurate prediction of the maximum surface subsidence caused by shallow tunneling in soil environments is a valuable criterion for safe design and operation, especially in urban areas. To investigate the surface subsidence due to tunneling, the simultaneous impact of depth and diameter of the tunnel in both saturated and dry conditions have been investigated using a FLAC3D Finite Difference Method. Six models having different diameters (7 m, 8 m, and 9 m), depths (12 m, 16 m, and 20 m), and face pressures (0.34 MPa, 0.36 MPa, and 0.38 MPa) were developed. A step-by-step excavation process of the tunnel advance was considered in the modeling to account for deformations ahead of the face and the shield’s effect. Results showed that depth and diameter induce a significant effect on the ground surface displacement values and crown displacement values. As face pressure increases, the effect of tunnel depth and diameter on surface and crown displacements decreases, and the effect of saturation did not change.

准确预测土壤环境中浅层隧道开挖引起的最大地表沉降是安全设计和运营的重要标准，尤其是在城市地区。为了研究隧道开挖引起的地表下沉，使用 FLAC3D 有限差分法研究了隧道深度和直径在饱和和干燥条件下的同时影响。开发了具有不同直径（7 m、8 m 和 9 m）、深度（12 m、16 m 和 20 m）和面压力（0.34 MPa、0.36 MPa 和 0.38 MPa）的六个模型。在建模中考虑了隧道推进的逐步开挖过程，以考虑工作面前方的变形和盾构的影响。结果表明，深度和直径对地表位移值和冠部位移值有显着影响。随着工作面压力的增加，隧道深度和直径对地表和冠部位移的影响减小，饱和度的影响没有改变。