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DONG Yun-xiu, FENG Zhong-ju, HAO Yu-meng, YAO Hong-sheng, ZHANG Xin-wang, XIE Fu-gui. Experiment on bearing capacity of bridge pile foundations in karst areas and reasonable rock-socketed depth[J]. Journal of Traffic and Transportation Engineering, 2018, 18(6): 27-36. doi: 10.19818/j.cnki.1671-1637.2018.06.004
Citation: DONG Yun-xiu, FENG Zhong-ju, HAO Yu-meng, YAO Hong-sheng, ZHANG Xin-wang, XIE Fu-gui. Experiment on bearing capacity of bridge pile foundations in karst areas and reasonable rock-socketed depth[J]. Journal of Traffic and Transportation Engineering, 2018, 18(6): 27-36. doi: 10.19818/j.cnki.1671-1637.2018.06.004
shu

Experiment on bearing capacity of bridge pile foundations in karst areas and reasonable rock-socketed depth

doi: 10.19818/j.cnki.1671-1637.2018.06.004
  • 1.

    School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China

  • 2.

    School of Civil Engineering, Longdong University, Qingyang 745000, Gansu, China

  • 3.

    CCCC Second Highway Consultant Co., Ltd., Wuhan 430056, Hubei, China

  • 4.

    China Construction Sixth Engineering Division Co., Ltd., Tianjin 300450, China

  • 5.

    Pingdingshan City Highway Administration, Pingdingshan 467001, Henan, China

  • 6.

    Chengdu Xingcheng Construction Management Co., Ltd., Chengdu 610000, Sichuan, China

More Information
  • Author Bio:

    DONG Yun-xiu(1989-), female, lecturer, doctoral student, DongYunxiu_0524@163.com

  • Corresponding author: FENG Zhong-ju(1965-), male, professor, PhD, ysf@gl.chd.edu.cn
  • Received Date: 2018-07-31
  • Publish Date: 2018-12-25
    Abstract
  • To study the bearing characteristics of bridge pile foundations in karst areas, with relevance to Xixie Overpass Project in Pingdingshan City, the pile foundatiion static load test was carried out.By placing strain sensors and displacement meters at the pile top and bottom, the internal forces of pile were measured, and pile top load (Q)-settlement (s) law of bridge in karst area was analyzed.Considering the limitations of current pile foundation design and combiningthe static load test results, the vertical ultimate bearing capacity of a single pile was predicted using different function models.Based on the wide beam mechanical model of rock-pile system and tensile-bending failure mode of karst cave roof, the calculation methods for the rock-socket depth of pile foundation were discussed, and an optimized calculation method for the rocksocketed depth of bridge pile foundations in karst areas was proposed.Research result shows that under different load levels, the Q-s curve exhibits slowly-varying developments.When the pile top load is small, the Q-s curve is basically linear.When the pile top load is greater than 6 000 kN, the Q-s curve becomes nonlinear.Although the pile is embedded deeply into limestone, it still shows typical friction pile characteristics.When loaded to 8 400 kN, the pile top settlement is3.69 mm, far less than the failure criterion of 0.03D (D is the pile diameter) or 40 mm.The pile tip resistance is 122.9 kN, accounting for only 1.6% of the pile top load.Bearing capacity of pile is still sufficient.Over the entire static load testing process, the stress state of pile is in the first stage of Kulhawy theory.The pile tip and side resistances develop synchronously.The fitting accuracy of hyperbola model is above 0.99 and the predicted value is determined to be safe.Thus, the model is recommended for use in similar projects.The proposed calculation method can reduce the rock-socketed depth of pile by 2.4 m, while meeting the requirements for safe thickness of karst cave roof, as well as bearing capacity and stability of pile foundation.

     

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