Study on the Application of Screw Pile Composite Foundation for High-speed Railway in Huanghuai Alluvial Plain Area
Based on the screw pile composite foundation project of Lankao South Station of Zhengzhou-Xuzhou Passenger Dedicated Line,the key construction technology and quality control measures of screw pile in the Huanghuai alluvial plain area are studied through the test piles and the quality inspection of the pile body.At the same time,the bearing capacity characteristics of screw piles and post-construction settlement of composite foundation are analyzed.The results show that the pile body of screw thread section can be formed in silty clay,silt,fine sand and pebble soil layer in the Huanghuai alluvual,and the pile quality is good.The single pile bearing capacity and composite foundation bearing capacity of screw piles meet the design requirements.The ultimate bearing capacity of screw piles is about 24％higher than that of ordinary grouted piles under the same conditions in this area.The settlement of screw pile composite foundation mainly occurs in the filling period.By the hyperbolic method,it is predicted that the settlement of three observed sections is less than 15 mm,which meets the requirement of ballastless track laying.
alluvial plainscrew pilecomposite foundationbearing capacity testsettlement monitoringquality control
万方数据
维普
