Laboratory Study on Load Carrying Capacity of Pile Group in Unsaturated Clay

Al-Omari, Raid R.; Fattah, Mohammed Y.; Kallawi, Abbas M.

doi:10.1007/s13369-018-3483-9

Cited by 14 publications

(9 citation statements)

References 9 publications

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“…is result indicated that superlong pile group can provide higher bearing Advances in Civil Engineering capacity, better settlement control, and significantly improved seismic behavior of a superstructure than a common pile group due to the long pile length. e present results are slightly different from the findings of Al-Omari et al [16] who showed that the settlement increases with the applied load until the load reaches some critical point at the start of load application, and then the curve of the load-displacement becomes steeper, and after this point, the settlement increases with almost constant load. e force settlement curves of the foundation piles in different position for different top loads are shown in Figure 4(b).…”

Section: Load-settlement Curvescontrasting

confidence: 99%

“…e effect of piled raft in reducing the settlement vanishes when the number of piles exceeds 6. Al-Omari et al [16] investigated the load transfer in pile groups constructed in saturated and unsaturated soil using aluminum model piles with six group configurations in addition to pullout test. Results of ultimate load capacity obtained from the load-displacement curves revealed an increase in the ultimate load with increasing the number of piles in the group for the same soil properties and an increase in pile capacity when the soil becomes in unsaturated state compared with saturated soil for the same pile group tested.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study on the Force Characteristics of Superlong Pile Groups in Silty Sand

Zhang

Liu

et al. 2022

Advances in Civil Engineering

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Laboratory model testing of single pile and superlong pile groups in saturated silty sand was conducted to investigate the response and bearing behavior of superlong pile groups with a high or low cap under vertical loads. The load transfer mechanism and bearing behavior of the pile shaft were discussed in detail. The load-settlement curve of the loaded superlong pile groups belongs to the type of gradual descent in silty sand. The transferred load decreased along the pile length during loading, but the gradients differed in different positions of the superlong pile group foundation with a high or low cap. The maximum shaft friction of the superlong pile groups with a high and low cap is about 2.5 times and 1.8 times, respectively, than that of the single pile. In addition, the tip resistance of the piles in the pile group foundation is about 2–3.5 times that of the single pile. The friction resistance of the superlong pile group foundation with a low cap was slightly larger than that of the high cap in the entire pile length, and two peaks and one peak, respectively, were observed. Under the ultimate load, the pile-soil maximum relative displacement of the friction on the pile side in the silty sand stratum was about 3% of the pile diameter. Under the ultimate load, the load sharing ratio of the pile side resistance of the two types of pile group foundations was about 60% of the total load. The load sharing ratios at the pile tip of the superlong pile groups with high and low caps are 40% and 33%. Furthermore, equations were proposed to determine the axial capacity of the superlong pile group based on the single pile bearing capacity and were applied to analyze the test pile. The calculated ultimate bearing capacity was similar to the measured value, with a maximum error of only 4.88%, thus validating the proposed method.

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Section: Load-settlement Curvescontrasting

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Force Characteristics of Superlong Pile Groups in Silty Sand

Zhang

Liu

et al. 2022

Advances in Civil Engineering

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“…Furthermore, Fu [17] carried out centrifuge model tests considering cyclic water lifting. Al-Omari et al [18][19][20][21][22] conducted a series of tests to evaluate the excess pore water pressure, the matric suction, the dynamic response and behavior of piles, the clay-pile adhesion, and the load transfer in piles in saturated and unsaturated soil.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Negative Skin Friction of the Pile Group Induced by Rising and Lowering the Groundwater Level

Zhang

Zhou

Wang

et al. 2021

Advances in Civil Engineering

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Negative skin friction (NSF) has been one of the important factors in the design of pile foundation; especially, the influence of water level on the pile negative skin friction should be paid attention. In this paper, a series of model tests were carried out to analyze the bearing characteristic of the pile group influenced by groundwater level. The pile axial force and negative skin friction, settlement, and soil pore pressure were investigated. The results showed that both the water level rising and lowering cycle could increase the axial force of the pile along the upper part of the pile, yet reducing it along the lower part of the pile; both the axial force and the negative skin friction of the pile presented a feature of time effect; the value of negative skin friction was positively correlated with that of the pile head load, and the neutral plane ranged from 0.57 L to 0.64 L as the water level changed; the soil featured settling in layers, and the change of pore water pressure was accordant with the water level changing regulation.

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“…Introducing parameter c, as a function of soil saturation, Bishop (1959) modified Terzaghi's model for unsaturated soils [9].…”

Section: Introductionmentioning

confidence: 99%

“…In unsaturated soil, matric suction plays an important role in the parameters of soil. However, due to the complexity of involving suction in the constitutive behavior of soil as a parameter affecting shear strength of soil, a few studies investigated the bearing capacity of a single pile or pile group in unsaturated soils [8,9]. some areas, the situation is different.…”

Section: Introductionmentioning

confidence: 99%

Numerical study on bearing capacity of a pile group next to a slope in unsaturated soils

2020

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The bearing capacity of a pile group mostly depends on parameters of the soil shear strength affected by the soil-water characteristics, especially in unsaturated soils. The soil shear strength is entirely affected by hydraulic stresses in unsaturated soil, such as precipitation and evaporation. Further, the bearing capacity of the pile installed on unsaturated soil depends on hydraulic stresses applied to the soil. Furthermore, slope vicinity may cause a severe decline in the pile bearing capacity. The present study aimed to investigate a pile group in unsaturated soil adjacent to a slope and analyzed the effect of the rainfall on the soil strength parameters. Thus, a numerical study has been performed using a finite difference software,i.e., FLAC2D. Besides, to investigate the model in a real situation, the intensity and duration of rainfall are considered to evaluate changes in hydraulic stresses. Finally, the results show that the rainfall causes a considerable decrease in soil strength parameters in unsaturated soil, leading to the reduction of the pile group bearing capacity and slope stability.

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Laboratory Study on Load Carrying Capacity of Pile Group in Unsaturated Clay

Cited by 14 publications

References 9 publications

Experimental Study on the Force Characteristics of Superlong Pile Groups in Silty Sand

Experimental Study on the Force Characteristics of Superlong Pile Groups in Silty Sand

Experimental Study on the Negative Skin Friction of the Pile Group Induced by Rising and Lowering the Groundwater Level

Numerical study on bearing capacity of a pile group next to a slope in unsaturated soils

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