Analysis and discussion on testing of large diameter and super-long piles in a project in Tianjin
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Tianjin North China Geological Exploration Bureau, Tianjin 300170, China

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TU473.1

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    Abstract:

    Testing of bearing capacity and integrity of foundation piles is the key step in acceptance inspection of concealed works. Usually, the testing method is planned in the design stage of pile foundation with the testing facilities placed or the ground treated in the construction stage, so as to facilitate the smooth execution of subsequent testing. The large diameter and super-long pile has high testing requirements due to the large design bearing capacity and complex pile conditions; thus, the principle of synchronous testing and design should be followed. On a project in Tianjin, the very negligence of prior design of foundation pile testing led to difficulty in large diameter and super-long pile testing. Though the conditions were limited, with professional technical analysis and many years of practical experience, and through formulation of testing methods and measures according to local conditions, the author has completed the bearing capacity verification test on large diameter and super-long piles with large tonnage surcharge by the step-by-step loading method, and integrity test on large diameter and super-long piles by combination of the low-strain method and the high-strain method, which provides valuable experience for similar works.

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History
  • Received:September 25,2020
  • Revised:March 03,2021
  • Adopted:March 19,2021
  • Online: August 13,2021
  • Published: August 10,2021