In the long-distance shield tunneling process, the shield tail brush needs to be replaced after wear failure, especially in cross-river and cross-sea tunnel projects. Taking the shield tail brush replacement project of Qingchun Road tunnel in Hangzhou, China as the research background, a three-dimensional sequential thermo-mechanical coupled numerical simulation was carried out to study the shield tail brush replacement with liquid nitrogen freezing by ABAQUS software. The development of temperature fields and displacement fields of soil, and the deformations of the tunnel sections along the longitudinal direction induced by freezing were obtained. The numerical model was further validated by site measurement. In addition, the effects of the frozen wall thickness, buried depth, excavation radius, and coefficients of linear thermal expansion of soils on the frost heave were studied.

在长距离盾构掘进过程中，在磨损失效后需要更换盾构尾刷，尤其是在跨河和跨海隧道工程中。以杭州庆春路隧道盾构尾刷更换项目为研究背景，利用ABAQUS软件进行了三维顺序热力耦合数值模拟，研究了液氮冻结盾构尾刷的更换。得到了土壤温度场和位移场的发展，以及冻结引起的隧道段沿纵向的变形。通过现场测量进一步验证了该数值模型。此外，冻结壁厚，埋深，开挖半径，