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Evaluating the Performance of Large-Diameter Bored Piles Socketed in Weathered Rock

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Abstract

The current design practice of the bored piles socketed in rock often ignores the end-bearing resistance and relies only on the side shaft resistance. This is due to the accumulation of soft soils as a result of improper cleaning of the slurry suspension at the bottom of the pile construction. This design practice significantly increases the length and cost of the pile foundation. The current study presents the bidirectional load test results on the large-diameter bored piles socketed in weak rocks at the Cua Dai bridge project, Quang Ngai province, Vietnam. The soil profile consists of medium loose to very dense silty sand underlain by the weathered granite rock. The test results and analyses showed that the ultimate shaft resistance and the maximum end-bearing resistance of the granite rock layer are much smaller than those estimated from the unconfined compressive strength of intact rock. The low shaft resistances are attributed to the presence of the slurry filter cake at the interface between the pile shaft and surrounding rock, while the low toe resistances are due to the presence of the soft soils below the pile toe. The importance of the allowable pile toe settlement and the presence of soft soils below pile toe have been addressed to consider the inclusion of end-bearing resistances in design.

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Acknowledgements

This work was supported by The University of Science and Technology, Da Nang University, Vietnam.

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Authors and Affiliations

  1. University of Science and Technology, The University of Danang, Danang, Vietnam

    Do Huu Dao & Thien Q. Tran

  2. The Charles Edward Via, Jr. Department of Civil and Environmental Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA, USA

    Thien Q. Tran

  3. Zachry Department of Civil and Environmental Engineering, Texas A&M University, College Station, TX, USA

    Surya S. C. Congress & Anand J. Puppala

  4. Geotechnical and Material Engineering, Testing and Inspection, Riner Engineering, Inc. (RINER), Houston, TX, USA

    Nguyen Minh Hai

  5. Department of Civil Engineering, Chonnam National University, Gwangju, Republic of Korea

    Young Sang Kim

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  1. Do Huu Dao
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Correspondence to Do Huu Dao or Thien Q. Tran.

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Dao, D.H., Tran, T.Q., Congress, S.S.C. et al. Evaluating the Performance of Large-Diameter Bored Piles Socketed in Weathered Rock. Indian Geotech J 52, 753–764 (2022). https://doi.org/10.1007/s40098-022-00623-1

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