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Mechanism of Deformation Compatibility and Pile Foundation Optimum for Long-Span Tower Foundation in Flood-Plain Deposit Zone

Abstract

It is vital to control the settlement of ultra-high voltage and long span tower foundation because of the difficult construction and strict deformation control. Based on the thinking of deformation compatibility, the mechanical model of deformation compatibility between pile and soil is established. Relying on the long span tower project Lingzhou–Shaoxing ±800 kV DC transmission lines across the Yangtze River, through checking ultimate bearing capacity of existing pile foundation, it can be obtained that the present design foundation can effectively meet the upper 200–220 t load, but it cannot meet the load requirements about 300 t in the construction. The failures of tower foundation mainly display that piles cut into the soil with penetration type in the early condition. With the load increasing, the shallow soil and infrastructure gradually damage with the whole cap sinking, cushion layer destruction and the surrounding soil uplifting. As a result, tower foundation is unable to withstand the effect of upper overload and the whole tower becomes shear failure. The treatment scheme was proposed that it can improve the cushion thickness and strength combined with grouting consolidation to soil around the piles. Thus, the stability of tower foundation improves significantly and settlement was controlled within the permitted range of below 10 mm, which can meet the structure requirements. The results of numerical simulation based on deformation compatibility between pile and soil coincide well with field measured results.

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Acknowledgments

The work is supported by the Open Research Fund Program of Hunan Province Key Laboratory of Safe Mining Techniques of Coal Mines (Hunan University of Science and Technology, 201505), the National Natural Science Foundation of China (51004007; 51304057), the Science and Technology Project of Ministry of Housing (2014K5002), the Open Research Fund of State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences (Z013010), the Science and Technology Plan Project of Wuhan City Urban and Rural Commission (201620), the Fundamental Research Funds for the Hefei key Project Construction Administration (2013CGAZ0771) and the Construction Industry Science and Technology Project of Anhui Province (2014YF12, 2013YF-27). All financial support is gratefully acknowledged.

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Correspondence to Yi-xian Wang.

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Yuan, Hp., Zhao, P., Wang, Yx. et al. Mechanism of Deformation Compatibility and Pile Foundation Optimum for Long-Span Tower Foundation in Flood-Plain Deposit Zone. Int J Civ Eng 15, 887–894 (2017). https://doi.org/10.1007/s40999-016-0066-6

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Keywords

  • Pile-soil interaction
  • Deformation compatibility
  • Settlement
  • Numerical simulation
  • Pile foundation optimum