Abstract:In the construction of urban infrastructure, more and more municipal tunnels and metro projects intersect in space and time. In tunnel construction, it is necessary to reserve construction conditions for long-term planning of rail transit. This paper takes a tunnel project as an example to study the use of short diaphragm wall + long soil mixing wall in the design of tunnel foundation pits and related reinforcement and construction measures to ensure the safety and stability of the deep foundation pit excavation and structural rebuilding of the tunnel, and Prerequisites are reserved for the planning of the ultra-short-distance and large-angle crossing construction of the metro shield. According to calculation analysis and monitoring data, the deformation of the tunnel enclosure structure, ground settlement and overall stability during the construction of the scheme are all in line with the design conditions and specifications. In the later stage, the metro shield also achieved smooth crossing without affecting the tunnel structure. The overall foundation pit design scheme is economical and feasible, and can provide a certain reference for similar related projects in the future.
