Zhou Wenjiao, Fan Jiawei, Qiu Shumao, Zhang Yufang
China Academy of Railway Sciences Co. Ltd, Beijing, 100081, China.
State Key Laboratory of Track Technology for High Speed Railway, Beijing, 100081, China.
Sci Rep. 2025 Jan 25;15(1):3174. doi: 10.1038/s41598-025-86584-w.
The construction of tunnels can easily trigger the reactivation of old landslide bodies, posing a threat to the transportation safety. In this study, using methods such as engineering geological investigation, slope deformation monitoring, deep displacement monitoring, and numerical simulation, the interaction between landslides and tunnels was investigated from the perspective of landslide deformation and failure characteristics. The Walibie Tunnel (WLBT) of Shangri-La to Lijiang (XL) expressway was taken as an example. The results showed that there were two unstable slopes developed in the upper part of the tunnel, with the new active landslides. Shallow and deep creeping deformation zones also exist within the landslide area. Combining the position of the deformation zones of the unstable slopes and the actual tunnel damage observed, it was determined that the failure mode of the tunnel was longitudinal tensile fracture in the traction section-tunnel. Numerical simulation and field investigation revealed the mechanism of interaction between the WLBT and landslides: the traction section of the tunnel passed through the unstable slope parallelly, and during the continuous opening and expansion process at the rear edge of the unstable slope, a significant tensile force was exerted on the tunnel, resulting in initial tensile fracture damage.
隧道建设极易引发老滑坡体复活，对交通安全构成威胁。本研究采用工程地质调查、边坡变形监测、深部位移监测及数值模拟等方法，从滑坡变形破坏特征角度研究滑坡与隧道的相互作用。以香格里拉至丽江高速公路的瓦丽比隧道（WLBT）为例。结果表明，隧道上部发育有两处不稳定边坡，并伴有新的活动滑坡。滑坡区内还存在浅部和深部蠕变变形带。结合不稳定边坡变形带位置及实际观测到的隧道破坏情况，确定隧道的破坏模式为牵引段隧道纵向拉伸断裂。数值模拟和现场调查揭示了瓦丽比隧道与滑坡的相互作用机制：隧道牵引段平行穿过不稳定边坡，在不稳定边坡后缘持续张开扩展过程中，对隧道施加了显著的拉力，导致初期拉伸断裂破坏。
