In this paper, using the finite element analysis and 3D modeling in Abaqus, the effect of different patterns of twin tunneling by the New Austrian tunneling method (NATM) on the ground surface settlement internal forces of a single pile is investigated. For this purpose, three commonly used tunneling patterns in NATM, including top heading (TH), central diaphragm wall (CDW), and sidewall drift (SD), are taken into account. The effect of tunneling patterns on a single pile was also studied. Comparison of the results shows that the TH pattern has the highest and the CDW has the lowest surface settlements. It was observed that in the twin tunneling, the increase and decrease of the magnitude of bending moment applied to the pile depended strongly on the tunneling patterns. In addition, in all tunneling patterns, the effective zone of maximum axial force distributed on the pile is within ± 2D (D is the diameter of the tunnel).

本文利用Abaqus中的有限元分析和3D建模方法，研究了新奥地利隧道方法（NATM）的双隧道不同模式对单桩地表沉降内力的影响。为此，考虑了NATM中三个常用的隧道模式，包括顶部航向（TH），中央隔板壁（CDW）和侧壁漂移（SD）。还研究了隧道模式对单个桩的影响。结果比较表明，TH图案的表面沉降最高，而CDW的表面沉降最低。可以看出，在双隧道中，施加到桩上的弯矩的大小的增加和减少在很大程度上取决于隧道的模式。此外，在所有隧道模式中，