Study on the influence of construction of shallow-buried underground excavation tunnel on adjacent masonry buildings

摘要

This study simulated the condition of below-wall raft foundation supported masonry structure perpendicularly penetrated by shallow-buried and mining tunnelling using 3D MIDAS/GTS software with consideration of the coaction of structure, ground and tunnel. The load and deformation patterns of structure before and after the penetration of tunnelling excavation face were evaluated. Results from the study showed that: when the horizontal distance between the central axis of the structure and the axis of the tunnel L=0 m, the settlement of the structure increased before and after the penetration of tunnel through the masonry structure, and the settlement became stable after the tunnel passed through a certain distance (approximately 2.4 times of the thickness of ground cover);;the structure settled overall and the difference of settlement was relatively small;;the maximum first principal stress P1 and the maximum deformation rate E1 showed an overall increasing trend. With the increase of L from 0, inclination of the structure towards the tunnel was witnessed, the settlement of foundation appeared to be linearly distributed and the inclination rate of foundation first increased then reduced;;P1 showed a decreasing trend and E1 first reduced, then increased and decreased again.