This study aims to establish an appropriate method to calculate the bearing deformation of large-diameter bored piles in alluvial deposits with soils characterized mainly by medium-dense to dense silt, fine sand, and plastic to hard plastic silty clay in the middle and lower reaches of the Yellow River. According to the field measurement results of 18 large-diameter bored piles in six sites of the third-ring expressway project in Zhengzhou, this study discusses the action laws of pile shaft friction with pile-soil shear displacements and pile tip resistances with pile end displacements. A pile shaft load transfer model and pile tip bearing model are then established for large-diameter bored piles. The calculation parameter values are also given. The feasibility and rationality of the calculation method are verified by an engineering example. According to the engineering example and by changing the parameters of the pile diameter and pile length, the properties of bearing capacities and deformations of the largediameter bored piles under this site condition are further analyzed. Results show that the inflection point of the pile Q s curve is obvious for large pile diameters. The pile bearing capacity and deformation property are significantly improved by increasing the pile diameter under a small load. The increase amplitude of the pile bearing capacity and deformation property obviously decreases with the increase in pile length. This result indicates that the improvement of the pile bearing capacity and deformation property by increasing the pile length is not effective. The pile without grouting shows an obvious puncture damage model. Moreover, the settlement of the pile without grouting is small with a large pile diameter or short pile length. The effective length and bearing capacity of a large-diameter bored pile can be greatly increased by pile tip post grouting. The increased value of the pile bearing capacity is high with a large pile diameter and pile length under pile tip post grouting conditions.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Load Transfer Calculation and Analysis of Large-Diameter Bored Piles According to Rules Based on Test Pile Measurement


    Contributors:
    Li, Yong-hui (author) / Zhu, Xiang (author) / Chen, Lu-jie (author) / Zhou, Tong-he (author)


    Publication date :

    2018-09-01


    Size :

    92018-01-01 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    Unknown



    Evaluation of the dynamic load test on bored piles in sandy soil

    Baeßler, Matthias / Niederleithinger, Ernst / Georgi, Steven et al. | HENRY – Federal Waterways Engineering and Research Institute (BAW) | 2012

    Free access

    Field Measurement and Analysis of Residual Stress in Bored Piles

    Nie, Ru-song / Leng, Wu-ming / Wu, Ai-hong et al. | ASCE | 2014


    Installation Technology for Bored Piles Foundations

    Stuglys, G. / Susinskas, S. / Aviza, D. et al. | British Library Conference Proceedings | 2014


    Comparison of static and dynamic load tests on bored piles in glacial soil

    Niederleithinger, Ernst / Baeßler, Matthias / Georgi, Steven et al. | HENRY – Federal Waterways Engineering and Research Institute (BAW) | 2014

    Free access