Bulging as a pile imperfection

Wakil, Amr Z. El; Kassim, Maznah Mat

doi:10.1016/j.aej.2010.07.004

Cited by 4 publications

(2 citation statements)

References 4 publications

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“…Huge test loads, and hence, high-capacity reaction systems should be used to accomplish the required enormous settlements. Thus, the targeted failure load may not always be practical to achieve, as reported in many case studies 27 – 29 .…”

Section: Introductionmentioning

confidence: 99%

Modified Meyerhof approach for forecasting reliable ultimate capacity of the large diameter bored piles

Al‐Atroush

Hefny

Sorour

2022

Sci Rep

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The static loading test is undoubtedly the most reliable method for forecasting the ultimate capacity of the large diameter bored piles (LDBP). However, in-situ loading of this class of piles until reaching failure is practically seldom due to the large amount of settlement required for shaft and base mobilization. Therefore, many international design standards recommend either capacity-based or settlement-based methods to estimate the LDBP ultimate capacity in case of the impossibility of performing loading tests during the design phase. However, those methods are invariably associated with various degrees of uncertainty resulting from several factors, as evidenced in several comparative analyses available in the literature. For instance, the settlement-based method of the Egyptian code of practice (ECP 202/4) usually underestimates the ultimate capacity of LDBP. In contrast, Meyerhof's capacity-based method often overestimates the LDBP’s ultimate capacity. In this paper, a modified approach has been proposed to forecast the ultimate capacity of the LDBP. This approach was modified from Meyerhof’s classical formula (1976) through three fundamental stages. First, an assessment study was performed to evaluate the reliability of the estimated LDBP ultimate capacity using Meyerhof’s classical method. For this purpose, results of full scale loaded to failure loading LDBP test and related twenty-eight parametric numerical models with various pile geometrical and soil geotechnical parameters have been used. Based on the assessment study findings, the essential modifications were suggested in the second stage to adapt Meyerhof’s classic method. In the third stage, the results of several numerical models and in-situ loading tests were employed to assess the accuracy of the developed modified method. This study showed that Meyerhof's classical method overestimated the ultimate capacity of LDBP with an error percentage ranging from 14 to 46%. On the other side, the proposed modified approach has succeeded in estimating the ultimate capacity of loaded to failure in-situ LDBP test and twenty numerical LDBP models with error percentages ranging from 0.267 to 7.75%.

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Section: Introductionmentioning

confidence: 99%

Modified Meyerhof approach for forecasting reliable ultimate capacity of the large diameter bored piles

Al‐Atroush

Hefny

Sorour

2022

Sci Rep

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“…Chan [7] reports that mixing soil material due to the collapse of the hole wall can result in a reduced pile bearing capacity. Wakil and Kassim [8] stated that bulging can increase the bearing capacity of the foundation even though it is still considered a defect in the pile. Therefore, changes in diameter are also considered in this analysis.…”

Section: Introductionmentioning

confidence: 99%

Bearing Capacity of Large Drilled Shafts Fully Embeded in Claystone and Sandstone Layers

Marwaji¹,

Arifin²

2022

Civense

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This paper focuses on analyzing the bearing capacity of large diameter drilled shafts that are fully embedded in the claystone and sandstone layers. The foundations used are the drilled shafts for the Pulau Balang bridge pylons built across the Balikpapan bay. Three bored pile foundations with a planned diameter of 2 meters by 60 meters were used. The bearing capacity of the foundation in the field was carried out using the Osterberg cell test. The bearing capacity of the upper side of the foundation is 32.77, 27.26, and 114.46 MN, and the lower parts are 26.98, 27.16, and 50.25 MN, respectively. The results show that the method closest to the upper part of the OC test is the method suggested by Kulhawy and Phoon, with a value of C = 0.5. As for the lower part, the closest approach is the combination of the Kulhawy and Phoon and the Rowe and Armitage methods. The combinations of methods that approximate the total bearing capacity of the field are the Kulhawy and Phoon (1993) and Rowe and Armitage (1987) methods for the dominant claystone layer, and the O'Neil and Reese (1993) and Rowe and Armitage (1987) methods for the main sandstone layer

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Characterizing Anomalies in Distributed Strain Measurements of Cast-in-Situ Bored Piles

Mohamad

Tee

Ang³

et al. 2016

Jurnal Teknologi

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This paper describes the method of identifying typical defects of bored cast-in-situ piles when instrumenting using Distributed Optical Fiber Strain Sensing (DOFSS). The DOFSS technology is based on Brillouin Optical Time Domain Analyses (BOTDA), which has the advantage of recording continuous strain profile as opposed to the conventional discrete based sensors such as Vibrating Wire strain gauges. In pile instrumentation particularly, obtaining distributed strain profile is important when analysing the load-transfer and shaft friction of a pile, as well as detecting any anomalies in the strain regime. Features such as defective pile shaft necking, discontinuity of concrete, intrusion of foreign matter and improper toe formation due to contamination of concrete at base with soil particles, among others, may cause the pile to fail. In this study, a new technique of detecting such defects is proposed using DOFSS technology which can potentially supplement the existing non-destructive test (NDT) methods. Discussion on the performance of instrumented piles by means of maintained load test are also presented

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Bulging as a pile imperfection

Cited by 4 publications

References 4 publications

Modified Meyerhof approach for forecasting reliable ultimate capacity of the large diameter bored piles

Modified Meyerhof approach for forecasting reliable ultimate capacity of the large diameter bored piles

Bearing Capacity of Large Drilled Shafts Fully Embeded in Claystone and Sandstone Layers

Characterizing Anomalies in Distributed Strain Measurements of Cast-in-Situ Bored Piles

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