Numerical analysis for the vertical bearing capacity of composite pile foundation system in liquefiable soil under sine wave vibration

Huang, Zhanfang; X, Bai; Yin, Chao; Yong-qiang, Liu

doi:10.1371/journal.pone.0248502

Cited by 3 publications

(5 citation statements)

References 16 publications

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“…The distribution curve of the CCPF at each moment intersected at −40~50 cm of the pile body, and the maximum value of the CCPF occurred at the bottom of the pile at each moment of vibration, from 0.75 at 0 s to 1.28 at 35 s; the maximum CCPF at 0 s and 15 s was less than 1. In line with previous research [16,21], no liquefaction occurred in the soil around the pile before 20 s of vibration, which indicates that the actual load on the top of the ZZ1 pile was less than the average of the total load. After 20 s of vibration, the soil began to liquefy, being approximately equal to 1 at 25 s, indicating that the load on the top of the pile was approximately equal to the average of the total load.…”

Section: Distribution Regularity and Characteristics Of Ccpf Along Th...supporting

confidence: 92%

Study on Vertical Load Distribution of Pile Group–Liquefied Soil System under Horizontal Seismic Environment

Huang

Bai

et al. 2023

Sustainability

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The dynamic responses of pile–liquefied composite soils are complex, and the bearing capacities of single piles or pile groups in liquefiable soils remain unclear. For friction piles, the friction resistance determines the vertical bearing capacity of the pile. In a pile–soil system, it is very important to study the friction resistance changes in the pile during vibration. Based on a shaking table test, this study investigated the vertical bearing capacity of a pile foundation–liquefied soil system under simulated horizontal seismic forces, using the MIDAS GTS software. The load borne by the top of the pile was studied under a horizontal earthquake with a certain vertical load, different pile spacings, and different vibration times, along with the cumulative coefficient CCPF of the pile side friction. The distributions of the CCPF along the pile body of a single pile and pile groups with different pile spacings were analyzed at different vibration times. It was found that the CCPF intuitively reflected the distribution law of the pile side friction during vibration. When the CCPF at the bottom of the pile was equal to 1, the load on the top of the pile was equal to the average value of the total load. When the CCPF at the bottom of the pile was less than 1, the load on the top of the pile was less than the average value of the total load. When the CCPF at the bottom of the pile was greater than 1, the load on the top of the pile was greater than the average of the total load.

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Section: Distribution Regularity and Characteristics Of Ccpf Along Th...supporting

confidence: 92%

Study on Vertical Load Distribution of Pile Group–Liquefied Soil System under Horizontal Seismic Environment

Huang

Bai

et al. 2023

Sustainability

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“…(3) Obtain 10 models with different training parameters and accuracy through steps (1) and ( 2); (4) Evaluate the model performance on the test data set T1;…”

Section: Test Resultsmentioning

confidence: 99%

“…According to the "Technical Specification for Testing of Building Foundation Piles", the following requirements are required for data collection: (1) The time domain data sampling points should not be less than 1024; (2) the sampling duration should be greater than 2 L/c + 5 ms; (3) the upper limit of the frequency range of amplitude-frequency data should not be less than 2000 Hz.…”

Section: Data Preprocessingmentioning

confidence: 99%

“…In engineering construction, foundation pile has been more and more widely used in recent years, as it has good load transfer performance, adaptability to complex geological conditions, and high bearing capacity [1][2][3]. However, it is followed by the increase in pile quality problems in the construction process, so the quality test of the pile foundation is of great significance for finding problems and taking necessary remedial means to ensure the construction quality of foundation pile in a timely manner [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

“…The characteristics of LSPT make it suitable for a wide range of surveys for foundation pile quality. In the testing technical specification, the number of foundation piles for pile integrity testing is stipulated: (1) If the design grade of the building pile foundation is Grade A, the number of tested piles shall not be less than 30% of the total number and shall not be less than 20; (2) for other pile foundation projects, the tested number should not be less than 20% of the total number of piles and should not be less than 10 piles. Therefore, there are a many foundation piles that need to be tested during construction, and LSPT is the best technical means to solve this problem.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Classification of Low-Strain Foundation Pile Testing Signal Using Recurrent Neural Network

Wang

Zhang

et al. 2023

Buildings

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The testing of the foundation pile is an important means to ensure the quality of the foundation pile in the construction process, and the low-strain pile test is one of the most commonly used testing technologies. However, in order to ensure that the testing signal is effective and reliable, it is necessary to provide the preliminary judgment results when acquiring the testing signal in the field. In this paper, we propose a data classification method for low-strain pile testing data using a recurrent neural network as the core. In this method, after identification, tailoring, and normalization, the input feature vector with a sequential structure is sent into this model. The model ensures the efficient use of data values while considering the sequential relationship among the data. At last, we designed and produced one complete model pile and six asymmetric model piles, which can form thirteen kinds of testing signals. The optimal application model was selected by the 10-fold cross verification method, and the influence of increasing the input feature dimension on the accuracy was discussed. Finally, compared with the other two methods, this model has the highest accuracy, at 98.46%, but it requires more training parameters and a longer training time.

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Determination of Piles Bearing Capacity using Empirical Methods and (AllPile 6) Software -Cases studies Portsudan and Khartoum Cities

2021

IJMMS

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Different methods have been used to determine the pile bearing capacity such as static equations, dynamic equations, empirical methods (EMs), numerical methods, computer software programs, and the pile static load test, these methods were giving different values for pile bearing capacity. In this paper, three empirical methods (Ems) have been selected (Brinch-Hansen, Chin-Kondner, and Decourt) and (AllPile 6) software (AP) has been applied to determine the capacity load of piles for six cases study of drilled concrete piles with a diameter ranging from 800 mm to 1500mm and embedded length ranged 10.5m to 26m. Four of those six piles are located at Portsudan city near the red seacoast and two piles are located in Khartoum city. The results of the pile bearing capacity (PC) calculations obtained using the above-mentioned different methods were compared with results produced by the pile load test. In all six cases study, the settlement of piles was limited, settlement failure was not reached. The results show that the AllPile 6 (AP) and the three mentioned empirical methods (Ems) gave reasonable piles bearing capacity, the (AP) and (BHM) gave the better result than the CKM and DM. While (DM) gave results similar to results determined using the (CKM). However, it was not preferred to use the (CKM) and (DM), unless the failure settlement has occurred in the pile load test.

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Numerical analysis for the vertical bearing capacity of composite pile foundation system in liquefiable soil under sine wave vibration

Cited by 3 publications

References 16 publications

Study on Vertical Load Distribution of Pile Group–Liquefied Soil System under Horizontal Seismic Environment

Study on Vertical Load Distribution of Pile Group–Liquefied Soil System under Horizontal Seismic Environment

Classification of Low-Strain Foundation Pile Testing Signal Using Recurrent Neural Network

Determination of Piles Bearing Capacity using Empirical Methods and (AllPile 6) Software -Cases studies Portsudan and Khartoum Cities

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