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《Railway Engineering》 2018-09
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Analysis on Characteristics of Pile Foundation Under Stack Load

WANG Jun;MA Xuening;College of Civil Engineering,Lanzhou Jiaotong University;  
The lateral stack load nearby the pile of the D4 large bridge of the Zhengxu high speed railway line was studied in this paper.The finite element model of pile-soil interaction was established using.The distribution of skin friction and axial force,a nd the settlement of pile top were studied respectively, considering different stack load levels and distances.The results indicate that the negative skin friction is mainly distributed within the range of 0. 57 pile length away from the pile top. The larger surcharge level,the greater negative skin friction and axial force. The maximum negative skin friction appears at 0. 29 pile length and the maximum force occurs at 0. 52 pile length.The greater stack load distance,the smaller skin friction and axial force.When the stack load distance is greater than 5 times of the pile diameter, skin friction and axial force are significantly reduced.Higher level of the stack load leads to more significant effect on vertical displacement of the pile while larger stack load distance results in less influence on the vertical displacement.The calculation results are supportive for the controlling of lateral stack load nearby the pile.
【Fund】: 国家自然科学基金(41562014)
【CateGory Index】: U443.15
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