关键词: 地铁隧道, 暗挖法, 软弱土层, 地表沉降, 变形控制

Abstract: The Shenzhen Metro Line 5 is excavated under crossing the OldPlum Garden with shallow foundation intensive buildings. The surrounding rocks are extremely fractured, and belonging to categoryVI. Deformation of soil layers is not easy to control during tunnel excavation. In order to guarantee the safety of construction and surface buildings, leading steel pipeline shed, rotary jet grouting pile and surface tracing compensation grouting are taken during tunnel construction. The leading steel pipeline shed plays a role of increasing the stiffness of the support and reducing the disturbance to the surrounding soil. The rotary jet grouting pile limits the lateral deformation of tunnel excavation. The surface tracing compensation grouting improves the mechanical properties of the soil layer and improves the compressive strength of the soil. Strata deformation requirement in the process of excavation of the underground running period has been effectively controlled. It makes subway tunnel running off through the area successfully.

Key words: subway tunnel, mining method, weak soil layer, ground settlement, deformation control