Abstract
As a result of rapid development of a high-speed railway and infrastructure in China in recent years, the subgrade deformation and settlement control standards put forward more stringent requirements. Based on ABAQUS 6.14, established finite element model of screw pile group composite foundation. Then obtained the settlement, axial force distribution and pile side resistance distribution of center pile of pile group. Next design parameters sensitive analysis was made, such as pile length, pile spacing and so on, in order to obtain a reasonable design pile parameters by analysis of mechanical behavior.
Highlights
The high-speed railway line from Harbin to Mudanjiang is 293.2 kilometers long, with a planned investment of more than 35 billion yuan and a design speed of 250 kilometers per hour
The relationship between the working performance of screw pile group and pile length l0, pile distance D, screw pile thread length l, screw segment ratio k (k=l/l0), pile spacing d, thread spacing S and blade dip angle α are studied in order to find the reasonable parameters of screw pile group design for background engineering
The upper side friction increases with the increase of load, but with the increase of load from 2MPa to 10MPa, the upper pile side friction increases gradually from 7kPa to 25kPA, and there is no softening phenomenon of pile side friction.(2) notice that under the condition of pile spacing 5D and load 10MPa, the pile side friction reaches 26.62kPa, slightly larger than the limit lateral friction 24kPa. the analysis should be that the pressure at the bottom of the pile cap leads to the soil compression of the pile top
Summary
The high-speed railway line from Harbin to Mudanjiang is 293.2 kilometers long, with a planned investment of more than 35 billion yuan and a design speed of 250 kilometers per hour. Construction of the entire line was start in 2015, and the project will be completed by the end of 2018, with a total duration of 54 months. After the completion of the project, Harbin to Mudanjiang operation time only about 80 minutes. This study is based on the foundation reinforcement project of DK24 750.00-DK25 800.00 section of Harbin-Mudanjiang high-speed railway. Construction of Zhengzhou-Xuzhou high-speed railway at Yongcheng North Station foundation reinforcement in 2012 was the first time using a new screw cast-in-place pile technology. The excellent bearing capacity of screw pile and the advantages of reducing settlement and deformation of high-speed railway foundation were highlighted for the first time. The cumulative length of using screw pile in high-speed railway foundation reinforcement in China has reached about 500 km
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