Analysis of deformation monitoring of adjacent existing subway stations during deep excavation of foundation pits
With the rapid development of new first tier cities,it is inevitable that new buildings will be built near subway stations.The excavation of deep foundation pits for new buildings will have a certain safety impact on the operation of subway stations and subways.This article takes the excavation of deep foundation pits for the Zhongyuan Science and Technology City Innovation Park project,which is adjacent to the Longhu Zhonghuan North Station and its affiliated structures of Zhengzhou Metro Line 4,as an example.Through on-site monitoring of sub-way stations and the slopes around the foundation pits,monitoring data of the entrance and exit of subway stations,the main body of subway stations,and the slopes around the foundation pits are obtained,and in-depth analysis of the monitoring data is conducted.The research results indicate that double row pile support has a good support effect on construction structures such as foundation pit slopes,subway station entrances and exits,and station main bodies;During the excavation process,due to soil unloading,the entrances and exits of the subway station and the main body of the subway station are raised,and the slopes around the foundation pit experience settlement due to soil disturbance;When excavating to the raft slab,the vertical and horizontal deformation of the subway station en-trance and exit,the station body,and the surrounding area of the foundation pit reaches its maximum value,and gradually decreases with the construction deformation of the basement structure;The ratio of deformation values to control values at the entrance and exit of the subway station and the main body of the station is less than 0.6,and the warning monitoring level is A level,which allows for normal external construction.
deep and large foundation pitssubway stationson site monitoringdeformation response
万方数据
维普
