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LIU Wei-zheng, XU Lin-rong, ZUO Shen, LIU Zhang-hong, CHEN Peng-fei. Influence of pile-raft foundation reinforcement on subgrade of adjacent existing railway[J]. Journal of Traffic and Transportation Engineering, 2015, 15(3): 16-26. doi: 10.19818/j.cnki.1671-1637.2015.03.003
Citation: LIU Wei-zheng, XU Lin-rong, ZUO Shen, LIU Zhang-hong, CHEN Peng-fei. Influence of pile-raft foundation reinforcement on subgrade of adjacent existing railway[J]. Journal of Traffic and Transportation Engineering, 2015, 15(3): 16-26. doi: 10.19818/j.cnki.1671-1637.2015.03.003
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Influence of pile-raft foundation reinforcement on subgrade of adjacent existing railway

doi: 10.19818/j.cnki.1671-1637.2015.03.003
  • 1.

    School of Civil Engineering, Central South University, Changsha 410075, Hunan, China

  • 2.

    School of Transportation and Civil Engineering, Shandong Jiaotong University, Jinan 250023, Shandong, China

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  • Author Bio:

    LIU Wei-zheng(1982-), male, lecturer, PhD, +86-731-82656563, liuwz2011@csu.edu.cn

  • Received Date: 2015-01-13
  • Publish Date: 2015-06-25
    Abstract
  • During the process of pile-raft foundation reinforcement of new railway, the deformation and stress of subgrade for adjacent existing railway were measured in situ by using stress spade, horizontal strain gauge and inclinometer, and the mechanical characteristics and deformation laws of subgrade were analyzed. In order to minimize test error, a finite element model (FEM) was built to calculate the subgrade deformation and stability, the conversion factor of slope horizontal displacement was obtained, and the maximum shear stress and slope safety factors of subgrade under different excavation depths were calculated using the FEM. Based on the monitoring and calculated results, the optimized protection measures were proposed and applied during the construction process, such as pile-raft interval construction, changing pile eonstruction, and hunging mesh with steel band and grouting along the subgrade slope. The protection effect was verified with the data from track inspection car by using scoring method and standard difference method. Analysis result indicates that the cumulative slope horizontal displacement of slope foot for adjacent existing railway is 24.25 mm during construction process, and the lateral displacement per day is less than 0. 59 mm. The horizontal displacement is sensitive to the construction process and can be used as a key indicator to describe the stability of subgrade. The horizontal stress of foundation soil in the depth range from 0 to 9 m between the new railway and existing railway increases and then decreases, the compressive stress is less than 10 kPa and the stress level does not change significantly in different construction stages. The safety factor of slope decreases from 1.08 to 0.54 as the excavation depth reach 2.2 m under the soak condition, and then the state of subgrade is unstable failure, the protection measures must be adopted in the subgrade slope. The track quality index(TQI) of the existing line increases by 129.58~during the construction process, which indicates the large linear fluctuation of geometry for existing railway, but the TQI is less than its safety limit, which indicates that the deformation of subgrade is controlled effectively by using optimized protection measures.

     

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