Field Test of Excess Pore Water Pressure at Pile–Soil Interface Caused by PHC Pipe Pile Penetration Based on Silicon Piezoresistive Sensor

Wang, Yonghong; Liu, Xueying; Zhang, Mingyi; Yang, Suchun; Sang, Songkui

doi:10.3390/s20102829

Cited by 7 publications

(3 citation statements)

References 30 publications

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“…In order to obtain the earth pressure and pore water pressure at the pile-soil interface, a silicon piezoresistive sensor was embedded in the model pile (Figure 2) [32]. e sensor range is specially customized according to the model experiments' earth pressure value, and the smaller the sensor's range, the smaller the sensor size.…”

Section: Sensor Layoutmentioning

confidence: 99%

Laboratory Tests on Open‐Close Pile Jacking and Load Bearing Characteristics in Saturated Clay Soil

Qiang¹,

Zhang

Zhou³

et al. 2022

Advances in Civil Engineering

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The stress characteristics of the pile-soil interface have an important influence on the effect and long-term bearing capacity of jacked piles. In order to obtain the stress characteristics of the pile-soil interface of the jacked pile in clay, the development law of pore water pressure and earth pressure for open- and closed-end jacked piles during the pile jacking process was studied using indoor model tests based on a saturated soft clay foundation. Test results show that, during the pile jacking process, the excess pore water pressure, earth pressure, and effective earth pressure at the pile-soil interface all increase gradually along penetration depth, and the increasing trend first increases linearly and then increases sharply at the pile end. The excess pore water pressure at the pile-soil interface of an open-end pile is smaller than that of a closed-end pile. The earth pressure and effective earth pressure at the pile-soil interface of the closed-end pile show a “lateral pressure degradation,” and the degradation becomes more and more significant with increasing depth. The pile-soil interface adhesion coefficient increases with increasing penetration depth, and the greater the adhesion coefficient is, the higher the tightness between the pile and soil will be. As a method of determining the interfacial tightness between the pile and soil, the adhesion coefficient is closely related to the excess pore water pressure and earth pressure generated during the pile jacking process and can accurately reflect the mechanical mechanism of pile jacking in saturated viscous soil. Results of this contribution can provide reference for theoretical research on the mechanical pile jacking mechanism in saturated viscous soil.

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Section: Sensor Layoutmentioning

confidence: 99%

Laboratory Tests on Open‐Close Pile Jacking and Load Bearing Characteristics in Saturated Clay Soil

Qiang¹,

Zhang

Zhou³

et al. 2022

Advances in Civil Engineering

Self Cite

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“…Numerous studies have tried to model the pore water response to pile installation or even other construction vibrations in the near-field analytically [5,30,31]. The initial stresses in the sandy soil before the pile is driven are the horizontal effective stress (𝜎 3 ), the vertical effective stress (𝜎 1 ), and the pore pressure (𝑈).…”

Section: Effect On Pore Water Pressurementioning

confidence: 99%

Archives of Civil Engineering

Kabeta

2022

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Several field and model tests have been conducted to investigate the impact of pile installation on bearing capacity. However, little is known about how piles behave during installation, how they interact with the surrounding soil, and how this affects sandy soil properties. This review paper investigates the effect of pile driving on surrounding sandy soil as it compacts sandy soil near to the pile. For this purpose, various related literature was studied based on the observation of the pile installation effect on earth pressure or lateral stress, relative density, and pore water pressure in the sandy soil. A change in the deformation and stress state of surrounding sandy soil due to pile driving was presented. The installation of fully displacement piles can lead to significant stresses and deformations in the surrounding sandy soil. This is one of the main causes of uncertainty in the design and analysis of pile foundations. According to this study, the sandy soil around the pile is compacted during pile driving, resulting in lateral and upward displacement. This leads to the densification effect of pile driving on loose sandy soil. Sandy soil improvement with driven piles depends on pile shape, installation method, and pile driving sequences. This study concludes that in addition to its advantages of transferring superstructure load to deep strata, the increased relative density of loose sand, the change in the horizontal stress, and the influence of compaction on the sandy soil parameters during pile driving should be considered during pile design and analysis.

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“…After the pile penetrates the soil layer, the excess pore water pressure of the relevant soil increases to its maximum value rapidly and then decays exponentially over time [10]. The dissipation trend of pore water pressure by different pile construction methods usually is different [11]. The generated pore water pressure decreases with the distance [12][13][14], and it takes a longer time to reach the peak value in a deeper position [13].…”

Section: Introductionmentioning

confidence: 99%

Field Test Study on Construction Disturbances of Driven Pile and PGP Pile

Shao,

Deng,

Chen

et al. 2023

Applied Sciences

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The pre-bored grouted planted (PGP) pile has been more and more used in recent years, but its precise disturbance effect in soft soil areas has not been studied deeply. Therefore, a comparative field test for the disturbances by PGP pile and driven pile construction in deep soft ground was carried out. It revealed that the excess pore pressure caused by the two kinds of piles decreases with the increase of radial distance, and the influence range is less than 7.5 d (d is pile diameter). The maximum excess pore pressure generated by PGP pile construction is about 100 kPa smaller than that generated by driven pile construction. The comparison of the soil pressure and lateral displacement between the two piles is related to the depth and soil type. The typical result is that the soil pressure caused by PGP pile construction is half that of the driven pile, and the maximum lateral displacement of the PGP pile is 50.7~53.8% of that of the driven pile. The noise generated during PGP construction was lower but continuous, and the maximum value at the same distance was reduced by 8 to 15% than the driven pile. The test results reveal the construction disturbance effect of PGP pile and provide a reference for the selection of pile construction method in soft soil areas.

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Field Test of Excess Pore Water Pressure at Pile–Soil Interface Caused by PHC Pipe Pile Penetration Based on Silicon Piezoresistive Sensor

Cited by 7 publications

References 30 publications

Laboratory Tests on Open‐Close Pile Jacking and Load Bearing Characteristics in Saturated Clay Soil

Laboratory Tests on Open‐Close Pile Jacking and Load Bearing Characteristics in Saturated Clay Soil

Archives of Civil Engineering

Field Test Study on Construction Disturbances of Driven Pile and PGP Pile

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