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The subway station is in the busy traffic position such as the railway station, commerce or intersection, and its surrounding environment is quite complex, there are building structures and roads on the ground, and there are various pipelines and groundwater and poor soil quality underground, etc., so the foundation pit of the station often adopts enclosure excavation, and the pipeline survey is carried out to find out the underground above-ground obstacles before the foundation pit excavation, and then the construction of the enclosure structure, the waterproof curtain and the foundation reinforcement are carried out, wherein the enclosure structure and the waterproof curtain are to ensure the balance of water and soil pressure in the excavation process, Foundation reinforcement needs to take a certain amount of time to ensure the reinforcement effect and can provide the strength and lateral resistance of the passive soil, the engineering precipitation is carried out after the completion of the enclosure structure, the waterproof curtain and the foundation reinforcement, because the engineering precipitation will pump out the water in the formation and cause the formation to hollow drum, if the construction of the enclosure pile, the waterproof curtain or the grouting pipe is carried out after the engineering precipitation, the hollow drum formation will be disturbed and the formation settlement will be caused, so the engineering precipitation is constructed after the enclosure (waterproof curtain) and the foundation reinforcement, and the foundation pit excavation begins after the precipitation meets the requirements, In the process of excavation, the foundation pit is monitored in real time, and if there is deformation or internal force changes, the foundation pit deformation control is fed back in time, and the foundation pit construction process is summarized above: pipeline investigation→ enclosure structure, water barrier curtain and foundation reinforcement synchronous construction→ engineering precipitation → support and excavation alternate construction/slope excavation→ monitoring, measurement and deformation control
Subway station foundation pit
Pipeline surveys
Envelope structure
Waterproof curtain
Ground reinforcement
Engineering precipitation
Enclosure excavation
Grading excavation
Earthwork excavation
Deformation control
Monitoring and measurement