Landslide-tunnel interaction mechanism and numerical simulation during tunnel construction: a case from expressway in Northwest Yunnan Province, China

Abstract The excavation of the tunnel on expressway in northwest Yunnan province induced landslide and a series problem such as ground surface cracks slope, sliding lining. This research aims to reveal interaction relationship between from prospective field monitoring numerical simulation. Firstly, engineering geological conditions slope where was located were obtained by investigation. “landslide traction segment-tunnel longitudinal tensile failure” mode put forward based spatial landslide. Secondly, methods adopted monitor displacement deep-seated landslide, propagation Finally, three-dimensional models established investigate stability under natural conditions, rainfall conditions. investigation results, simulation results illustrated that: (1) traversed segment body parallel, failure or shear dislocation would occur at different stages (2) Two layers discovered shallow creep layer deep layer, which corresponded modes proposed mode, respectively. (3) an unstable state disrupted initial stress equilibrium resulting release surrounding rock mass. Both exacerbate deformation tunnel. Eventually, control measures grouting technology steel floral tubes suggested counter with landslide-tunnel problems.