High-speed Rail Soft Ground Bridge Pile Foundation Settlement Analysis

In order to keep high regularity and high stability of Bridge Track Structure in the high-speed railway,to ensure that its operation is safe and comfortable.High-speed railway proposed the very strict request to the settlements of bridge pile group foundation,especially in the post-construction settlement.As a result, the thesis developed the analytical study to calculate settlement and post-construction settlement of bridge pile group foundation,which provides the necessary technical support for high-speed railway and passenger dedicated line,and has important significance in high-speed railway.Based on in-situ dead load tests for the pile groups,the paper intended to make a research for the KunShan testing segment of the Beijing- Shanghai High-speed Railway. Firstly, the thesis presented the development of calculating settlement of pile group foundation and consolidation theory at present in details; Secondly,the paper introduced field test locale and test contents, including:field condition,disposal of deformation observation dot and observation data; Thirdly,the thesis studied the means that three-dimensional complex analysis bring forward to calculate settlement of pile groups, the result of which was compared with the that of calculation of current criterion,and was checked by the Finite Element Anylysis Software GTS at the same time;Finally,the paper introduced method based on consolidation theory to calculate post-construction settlement.The method is the calculation based on the Terzaghi one-dimensional consolidation theory to calculate the post-construction settlement of the bridge pier and abutment.With the listed above analysis ,the main characteristics of settlement behavior and the main factors of pile group foundation was be fully studied,and obtained some practical significance conclusion,which may supply the design of bridge pile foundation in the railway in similarity for future reference.