Nonlinear Stress Analysis of Flexible Pile Composite Foundation by Energy Method

Wu, Youping; Fu, Liangming; Wu, Weimin; Cao, Yuanyuan; Zhou, Xuanyang

doi:10.1155/2018/8176398

Cited by 4 publications

(2 citation statements)

References 10 publications

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“…Therefore, the load-bearing performance and load transfer principle of a CFMP fly ash composite foundation under cyclic load are essential research directions [22][23][24]. Bai et al [25][26][27] used an indoor model test to study the deformation features of the composite foundation and the influencing factors of permanent settlement.…”

Section: Introductionmentioning

confidence: 99%

Model Test of Bearing Characteristics of Fly Ash Foundation under Cyclic Loading

et al. 2022

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Based on the vertical cyclic model test of the cement-fly ash mixing pile (CFMP) composite foundation, the effects of different dynamic load ratios on the long-term bearing characteristics of the composite foundation were studied. From the perspectives of foundation cumulative settlement, dynamic stiffness, pile axial force, and pile lateral friction, etc., the bearing mechanism of the CFMP fly ash composite foundation under cyclic load was investigated. By virtue of the assay herein, the authors discovered that the cumulative settlement under different load ratios exhibited the “threshold effect”, which could be divided into the attenuation type and destruction type. When the peak value of the cyclic load was close to the ultimate bearing capacity, the dynamic failure of the pile foundation occurred. The cyclic displacement ratio ranged from 1.05 to 1.23, satisfying the relation of quadratic equation. The cyclic load settlement could be predicted by the static load displacement. During cyclic loading, the proportion of the pile side sharing the upper load decreased persistently, and the fatigue degradation of side friction resistance occurred. The degradation could be alleviated by reducing the water content of fly ash and taking waterproof measures during construction.

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Section: Introductionmentioning

confidence: 99%

Model Test of Bearing Characteristics of Fly Ash Foundation under Cyclic Loading

et al. 2022

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“…erefore, the damage of building foundation is often accompanied by more complex damage, such as punching and torsion of the pile caused by the horizontal force [11,12]. Meanwhile, due to the properties of reinforced concrete and other materials [13], when the pile is damaged due to the horizontal load, a bending phenomenon will occur rather than simple rigid failure [14,15]. erefore, the bearing mechanism of a exible concrete expanded-plate pile (F-CEP pile) in the horizontal direction should be studied [16,17].…”

Section: Introductionmentioning

confidence: 99%

Influence of the α Angle of Flexible Concrete Expanded-Plate Piles on the Bearing Capacity under Horizontal Load

Qian

Chen

et al. 2022

Advances in Materials Science and Engineering

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Concrete expanded-plate piles have significant advantages in the bearing capacity, settlement, and construction period. The added bearing expanded plate is the key reason for their many advantages; moreover, the slope angle (α angle: the maximum diameter of the bearing expanded plate and the angle formed on the plate) of the bearing expanded plate is the main factor to control the longitudinal symmetry. However, the concrete expanded-plate piles in practical engineering do not exist in a rigid body state, and elastic deformation will occur under variable engineering conditions. In addition, the research in this paper mainly focuses on a flexible concrete expanded-plate pile (F-CEP pile). The flexible pile mentioned in this paper refers to the bending deformation of the pile body under horizontal load, which produces large pile top displacement. This study uses the two methods of small-scale half-plane pile model test and finite element simulation analysis of ANSYS, after referring to the equipotential pile test at the actual site. In this paper, the variation law of the displacement curve and the failure law of the soil around the pile under the horizontal force when the α angle changes are analyzed, and the calculation model of the bearing capacity of F-CEP pile under the α angle change is put forward. This research aims to verify the reliability of existing research and provides strong support for the application, promotion, design, and research of F-CEP piles in construction engineering.

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Scaling up resource recovery of plastics in the emergent circular economy to prevent plastic pollution: Assessment of risks to health and safety in the Global South

2022

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Over the coming decades, a large additional mass of plastic waste will become available for recycling, as efforts increase to reduce plastic pollution and facilitate a circular economy. New infrastructure will need to be developed, yet the processes and systems chosen should not result in adverse effects on human health and the environment. Here, we present a rapid review and critical semi-quantitative assessment of the potential risks posed by eight approaches to recovering value during the resource recovery phase from post-consumer plastic packaging waste collected and separated with the purported intention of recycling. The focus is on the Global South, where there are more chances that high risk processes could be run below standards of safe operation. Results indicate that under non-idealised operational conditions, mechanical reprocessing is the least impactful on the environment and therefore most appropriate for implementation in developing countries. Processes known as ‘chemical recycling’ are hard to assess due to lack of real-world process data. Given their lack of maturity and potential for risk to human health and the environment (handling of potentially hazardous substances under pressure and heat), it is unlikely they will make a useful addition to the circular economy in the Global South in the near future. Inevitably, increasing circular economy activity will require expansion towards targeting flexible, multi-material and multilayer products, for which mechanical recycling has well-established limitations. Our comparative risk overview indicates major barriers to changing resource recovery mode from the already dominant mechanical recycling mode towards other nascent or energetic recovery approaches.

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Nonlinear Stress Analysis of Flexible Pile Composite Foundation by Energy Method

Cited by 4 publications

References 10 publications

Model Test of Bearing Characteristics of Fly Ash Foundation under Cyclic Loading

Model Test of Bearing Characteristics of Fly Ash Foundation under Cyclic Loading

Influence of the α Angle of Flexible Concrete Expanded-Plate Piles on the Bearing Capacity under Horizontal Load

Scaling up resource recovery of plastics in the emergent circular economy to prevent plastic pollution: Assessment of risks to health and safety in the Global South

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