Deformation Monitoring and Analysis of Foundation Pit in Soil-rock Combined Stratum Under Moving Load of Portal Crane
YANG Xiaohua;China Railway Construction Investment Group Co.Ltd.;
The Miaolinglu station of Qingdao metro is a transfer station and its foundation pit was excavated by open-cut method in the soil-rock combined stratum which was specificly exiting in Qingdao area.There are many existing and constructing buildings close to the foundation pit.Various complex factors such as geological condition,construction condition and load condition would cause large deformation of the retaining structure of foundation pit and its surrounding soil during excavation,and so would have a great impact on the safety of the foundation pit.In order to meet the safety requirements of foundation pit construction and near buildings,on the basis of site mornitoring data,t he parameters such as ground settlement around foundation pit, lateral displacement of piles,pile top translocation,pile settlement,building foundation settlement and anchor internal force under moving load of portal crance were analyzed. The results show that the stress and deformation of support structure are within the design cortrol limit under the moving load of portal crance. The pile-anchor support system is reasonable and effective for deep foundation pit in soil-rock combined stratum under the portal crane.
【CateGory Index】： U231.3