Comparison and Selection of Construction Methods for Foundation Excavation of Subway Station and Analysis of Excavation Deformation Characteristics
Taking the foundation excavation project of a subway station in Xi'an as the background,through the comparison and selection of construction methods,the technical characteristics of each construction method are summarized,and the appropriate construction method is selected based on the actual project.At the same time,the monitoring and analysis of site excavation are carried out to study the influence of the early excavation stage of the foundation excavation on the deformation of the retaining structure and the surrounding surface under the special geological conditions of the water-rich sand layer,and the deformation law of the foundation excavation excavation is summarized.The results show that from a variety of construction conditions,taking into account the impact of road traffic,economic benefits,technical difficulties,and time limit,the construction method of cover excavation and semi-reverse construction is the most suitable and feasible.The excavation of the foundation excavation causes the retaining structure to shift to the inside of the foundation excavation.During the whole excavation process,the release of soil stress causes the settlement of the retaining pile and the uplift and settlement of the surrounding ground surface.At the same time,the construction processes are closely connected and interact with each other.During construction,the relevant factors should be considered in many aspects in advance.The construction speed of semi-reverse construction is fast.The station structure should follow up on the construction in time to play a role in limiting the excavation deformation and ensuring construction safety.
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