There are an increasing number of cases wherein the soil around a tunnel is immersed in water, which adversely affects the tunnel. To study the influence mechanism of local immersion of loess stratum on metro shield tunnel in detail, a similarity model test and numerical simulation were used in this study. These were used to investigate the stress and deformation of tunnel lining and stratum and surface settlement after a local soil collapse in the tunnel, and the mechanical mechanism that causes this effect. Further, the influences of different methods of water immersion on the tunnel lining were studied using numerical simulation. The results showed that the larger the collapsing area, the larger the bending moment and the axial force increment of the tunnel lining and the surface settlement; the bending moment and axial force near the side of the collapsing area were larger than those of the non-wet side. Vertical stress in the collapsible area was reduced, while the vertical stress of the non-collapsible soil on both sides of the collapsible area was increased due to the transmission of stress. When the water immersion area was the same, different water immersion methods also made the internal force of the tunnel lining slightly different; however, the difference was not obvious.

越来越多的情况将隧道周围的土壤浸入水中，从而对隧道产生不利影响。为了详细研究黄土层局部浸入对地铁盾构隧道的影响机理，采用相似模型试验和数值模拟。这些用于调查隧道局部土层塌陷后隧道衬砌，地层的应力和变形以及地表沉降，以及引起这种效应的机械机理。此外，利用数值模拟研究了不同的浸水方法对隧道衬砌的影响。结果表明，塌陷面积越大，隧道衬砌的弯矩和轴向力增量越大，地表沉降越大。坍塌区域一侧的弯矩和轴向力大于非湿侧的弯矩和轴向力。由于应力的传递，减小了可塌陷区域的垂直应力，而可塌陷区域两侧的非可塌陷土壤的垂直应力却增加了。当浸水面积相同时，不同的浸水方法也会使隧道衬砌的内力略有不同。但是，差异并不明显。不同的浸水方法也使隧道衬砌的内力略有不同。但是，差异并不明显。不同的浸水方法也使隧道衬砌的内力略有不同。但是，差异并不明显。