Influence of Bag Piles Construction in Soft Soil Subgrade for Additional New Line on Adjacent Operating Railway
In the project of adding the third and the fourth lines to the section of Ningbo Railway Hub from Zhuangqiao to Ningbo,bag piles were used to strengthen the soft soil foundation because the works was adjacent to operating railway.Based on this project,field monitoring was carried out on the construction of bag piles,and then contrast tests of high pressure jet grouting pile and cement mixing pile were also conducted to analyze the influence of the construction on the operating railway.The result shows that,the horizontal displacement and settlement of ground surface caused by the construction of bag piles were both less than 10 mm and did not exceed the control criterion for cumulative displacement of railway subgrade;during the construction,excess pore water pressure and soil pressure increase simultaneously,but the variation caused is small and will dissipate soon after the construction,and the soil pressure and excess pore water pressure negatively relate to distance in exponential function;the reach of construction is about 3.0 m;compared with the small disturbance caused by the construction of jet grouting pile and cement mixing pile on the surrounding environment,the impact of bag piles is minimum.
soft soil subgradeadditional railway linebag pilepore water pressureconstruction influencesettlement monitoringdisplacement control
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