Research on analytical conversion method of self-balanced test pile results

Ou, Xiaoduo; Bai, Lu; Jiang, Jie; Lyu, Zhengfan; Qin, Jinxi

doi:10.1080/19648189.2021.1983470

Cited by 3 publications

(2 citation statements)

References 16 publications

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“…Determining the carrying capacity is an important consideration in pile foundation design, and regulations require sampling inspection of the piles' carrying capacity [25][26][27]. The O-cell static load testing method, a novel approach for assessing pile load-bearing capacity, has been extensively embraced in a multitude of engineering endeavors [19,20,39].…”

Section: Introductionmentioning

confidence: 99%

Investigate the post-grouting bearing property of drilled piles in heavily weathered mudstone strata based on the O-cell test method

Ou,

Sang,

Bai

et al. 2023

Preprint

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The study focuses on analyzing the bearing capacity of six cast-in-place drilled piles located in three distinct portions of the urban square at Ronghe East Station in Nanning was evaluated through static load testing using the Osterberg cell (O-cell) method, and the bearing deformation characteristics of post-grouting piles in heavily weathered mudstone stratum were analyzed. By fitting the resistance and relative displacement curves at the pile end and side, a load-settlement calculation method for post-grouting piles in a heavily weathered mudstone stratum was established by adopting the hyperbolic load transfer model, which has the tip hardening and the side softening. The accuracy of the method was verified through actual engineering test pile modeling and changed post-grouting piles' diameter and length to further examine their bearing properties. The bearing capacity exhibits a progressive increase with an increase in either the length or diameter of the pile. However, an effective length exists when the pile length is increased to increase the bearing capacity. The use of combined grouting technology can achieve a significant increase in bearing capacity, up to approximately 1.3 times, which can realize the economy and high efficiency of improving the bearing performance of pile foundations.

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Section: Introductionmentioning

confidence: 99%

Investigate the post-grouting bearing property of drilled piles in heavily weathered mudstone strata based on the O-cell test method

Ou,

Sang,

Bai

et al. 2023

Preprint

Self Cite

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show abstract

“…Currently, in engineering, the test results of self-balanced test piles are converted to conventional static load test Q-s curves by the exact conversion method and the simplified conversion method. With the simple conversion method, it is difficult to determine the exact value of the conversion coefficient in different soil layers [23,24,32], and it lacks of some theoretical support [33][34][35]. The precise conversion method also increases the burden on the test pile, since each micro-segment's displacement and internal force need to be measured with many specific displacement transducers [36].…”

Section: Introductionmentioning

confidence: 99%

Research on the Analytical Conversion Method of Q-s Curves for Self-Balanced Test Piles in Layered Soils

Huang

Bai

et al. 2022

Applied Sciences

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An analytical conversion method was developed for the self-balanced test results of monopile bearing capacity in layered soils to realize the better applicability of the self-balanced test theory for the bearing capacity test of foundation piles. To the additional settlement of the lower pile bottom brought on by the negative friction of the upper pile soil during the loading process in layered soils, the interaction effect between the upper piles and lower piles is first taken into account. To accurately convert the results of the self-balanced test pile into the traditional static load test curve form and solve the ultimate bearing capacity, the displacements and internal forces at micro-segment piles in each layer of soil were obtained using the finite difference method. Then, for verification, conventional static test piles and indoor model tests were conducted in a multi-layered ground foundation. The outcome demonstrates that the simplified conversion method’s bearing capacity of the test pile is greater than that of the traditional static pressure test, the analytical conversion method’s Q-s curve is relatively similar to the results of the conventional static load test, and the accuracy of the analytical conversion results is increased by about 9.3 percent. At the same time, the analytical conversion method was applied to the self-balanced test project of bored cast-in-place piles in Wutong Garden, Laibin, Guangxi, China, and the accurate bearing capacity and internal force deformation characteristics were obtained. The accuracy of the calculation result is improved by 12% compared with that of the simple conversion calculation result. Therefore, it can be widely promoted and applied in self-balanced pile bearing capacity test projects.

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Experimental study on controlling basement leakage for urban flooding mitigation

Yue,

Han,

Zhao

et al. 2024

Structures

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Research on analytical conversion method of self-balanced test pile results

Cited by 3 publications

References 16 publications

Investigate the post-grouting bearing property of drilled piles in heavily weathered mudstone strata based on the O-cell test method

Investigate the post-grouting bearing property of drilled piles in heavily weathered mudstone strata based on the O-cell test method

Research on the Analytical Conversion Method of Q-s Curves for Self-Balanced Test Piles in Layered Soils

Experimental study on controlling basement leakage for urban flooding mitigation

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