Calculation Approach for Lateral Bearing Capacity of Single Precast Concrete Piles with Improved Soil Surrounds

Du, Guanglong; Wang, Anhui; Li, Liye; Zhang, Dingwen

doi:10.1155/2018/5127927

Cited by 8 publications

(5 citation statements)

References 25 publications

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“…To ensure the safety and reliability of the test, the bearing capacity of the pile (as shown in Table 3) was estimated by using formula (1) recommended in Chinese standard [48] before the test:…”

Section: Bearing Capacity Estimationmentioning

confidence: 99%

“…Pile foundations have been developed for thousands of years since the discovery of early pile foundation sites in the Republic of Chile. Up to now, pile foundations are also the most widely used building foundations or supporting structures [1][2][3][4]. When surface soils are too loose (soft) to support the shallow foundation safely and economically, such geotechnical structures can be used to better distribute the loads through the soil (friction piles) or transmit loads to a stronger soil layer at depths (end-bearing piles) [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

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A Full‐Scale Field Study on Bearing Characteristics of Cast‐in‐Place Piles with Different Hole‐Forming Methods in Loess Area

Zhou

Yang

Fan

2019

Advances in Civil Engineering

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This paper presents the results from a full-scale field study on the 3 different types of cast-in-place piles: rotary drilling piles (RDPs), manual digging piles (MDPs), and impact drilling piles (IDPs), for a bridge construction project of Wuqi–Dingbian Expressway, in Shaanxi. The results indicate that under the similar conditions, MDP exhibits the largest bearing capacity (11000 kN) in the loess area, followed by RDP (9000 kN) and IDP (8000 kN). And all tested values exceed the estimated value (7797.9 KN), indicating that the calculation formula of bearing capacity recommended by the Chinese standard is safe and conservative. During the load transfer process, the axial force attenuation rate of the pile body increases with pile side resistance. The average attenuation rate of MDP is the largest (24.2%), followed by RDP (19.72%) and IDP (16.69%). The bearing characteristics of these test piles are mainly pile side resistance, but the manual digging method created the least amount of disturbance to the soil around the pile, and due to its hole wall being rough, this enhances the pile-soil interactions. Hole-forming methods mainly affect the exertion of pile side resistance compared with pile end resistance. In view of pile side resistance and pile end resistance not taking effect at the same time, degree of exertion of these 2 resistances should be considered when designing cast-in-place piles in loess areas, and different partial coefficients should be used.

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Section: Bearing Capacity Estimationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Full‐Scale Field Study on Bearing Characteristics of Cast‐in‐Place Piles with Different Hole‐Forming Methods in Loess Area

Zhou

Yang

Fan

2019

Advances in Civil Engineering

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“…[3][4][5][6][7] With regard to lateral loads, the design criteria limit pile deflections and stresses to within tolerable values. 8 The lateral behavior of piles has also been extensively studied, [9][10][11][12][13][14][15][16][17][18][19] and various methods, such as finite element 20,21 and py curve, 22,23 are available for analyzing the pile response under lateral loading.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of lateral capacity for flexible drilled shafts in cohesionless soils

et al. 2022

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This study aimed to evaluate and improve the p– y curve method for use in the lateral analysis of flexible circular drilled shafts in cohesionless soils. Onsite circular drilled shaft lateral load test data from all over the world were collected, and the applicability of O’Neill and Murchison's p– y curve method was evaluated by comparing the measured values with the method's predicted values. Results showed that the current predictions were underestimated after applying the method to a database of flexible circular drilled shafts in cohesionless soils. Then, the difference (Δ Q) between the predicted value ( Qp) and measured value ( Qm) was normalized using the measured value (Δ Q/ Qm) to determine the percent difference, and an average value of − 47% was produced. The difference ratio between the measured and predicted values was proportional to the diameter of the pile. To calibrate the prediction of the current method, this study applied two parameters (α and β) as modifications to reduce Δ Q. The parameters were decided by using the average difference ratio and average absolute difference methods. The reliability and consistency of the prediction of the p– y curve method were enhanced by applying the recommended modifying parameters. Specific design recommendations were also provided based on the proposed modifications on the original p–y curve.

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“…However, there were some problems in the above research studies, such as the small size of the experimental models and the incomplete research on the combined application technology. With the development of computer technology, Dan and Shie [18]; Rollins et al [19,20], Zhou et al [21], Shi et al [22], and Du et al [23] used numerical simulations to study the effects of vertical and horizontal bearing, which broadened micropile research ideas and made use of multifactor analysis and repeatable calculation. However, the theoretical results of these studies could not be verified, and the model data were difficult to apply to actual projects.…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study of Horizontal Bearing Capacity of Vertical Steel Floral Tube Micropiles with Double Grouting

Wang

Shang

2018

Advances in Civil Engineering

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This paper examines the performance of a novel technology, vertical steel floral tube micropiles with double grouting. It is the combination of micropile technology and double grouting technology. A large-scale model tank was applied to impart horizontal bearing capacity, and the slope soil pressure and flexural performance of the micropile were investigated under four experimental conditions. The peak grouting pressure during the double grouting process was defined as the fracturing pressure of the double grouting, and it was positively correlated to the interval time between first grouting and secondary grouting. Compared with traditional grouting, double grouting increased the horizontal bearing capacity of the single micropile with the vertical steel floral tube by 24.42%. The horizontal bearing capacity was also 20.25% higher for the structure with three micropiles, compared with a 3-fold value of horizontal sliding resistance. In the test, the maximum bending moment acting on the pile above the sliding surface was located 2.0–2.5 m away from the pile top, and the largest negative bending moment acting on the pile below the slip surface was located 4.0 m away from the pile top. The ultimate bending moment of the single pile increased by 12.8 kN·m with double grouting, and the bending resistance increased by 96.2%. The experimental results showed that the double grouting technology significantly improved the horizontal bearing capacity of the micropile with the steel floral tube, and the soil reinforcement performance between piles was more pronounced. Also, the shear capacity and the flexural capacity were significantly improved compared with the original technology.

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Calculation Approach for Lateral Bearing Capacity of Single Precast Concrete Piles with Improved Soil Surrounds

Cited by 8 publications

References 25 publications

A Full‐Scale Field Study on Bearing Characteristics of Cast‐in‐Place Piles with Different Hole‐Forming Methods in Loess Area

A Full‐Scale Field Study on Bearing Characteristics of Cast‐in‐Place Piles with Different Hole‐Forming Methods in Loess Area

Evaluation of lateral capacity for flexible drilled shafts in cohesionless soils

An Experimental Study of Horizontal Bearing Capacity of Vertical Steel Floral Tube Micropiles with Double Grouting

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