Abstract：
Face stability of shallow-buried covered excavation tunnel is the precondition for tunnel construction. Soil stratum deformation may be caused at the covered excavation tunnel face arch due to extrusion and movement of excavation soil towards tunnel, and longitudinal soil arch could be formed after stress redistribution in soil stratum and could support the load of upper soil and keep the face stability. Unexcavated soil at tunnel face under longitudinal load and horizontal force at deep soil stratum formed slip crack surface, which is an oblique slip plane. Core soil action of cohesive and non-cohesive soil stratum and different strata were studied to determine the maximum excavation height of tunnel.
