Analytical solution for longitudinal vibration of a floating pile in saturated porous media based on a fictitious saturated soil pile model

Cui, Chunyi; Meng, Kun; Xu, Chengshun; Liang, Zhimeng; Li, Haijiang; Pei, Huafu

doi:10.1016/j.compgeo.2020.103942

Cited by 166 publications

(53 citation statements)

References 34 publications

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“…Landfilling is a commonly used MSW management method all around the world [1,2]. Due to the biochemical reaction of degradable components in MSW, the releasing of polluted leachate and landfill gas will be a long-term process that may take years even decades [3][4][5][6]. Therefore, it is of great necessity to reduce landfill emissions so as to avoid long-term environmental risks [7].…”

Section: Introductionmentioning

confidence: 99%

Numerical Model of Leachate Recirculation in Bioreactor Landfills with High Kitchen Waste Content

Zhang

Liu

Jiang

et al. 2021

Water

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Surface spraying, horizontal trenches, and vertical wells are the most common leachate recirculation system used at landfills in engineering practice. In order to quantify the efficiency of the three aforementioned recirculation systems, a hydro–biochem–mechanical-coupled model was developed in the present work, which can describe hydrodynamic and biochemical behaviors in food-waste-rich landfills. A typical landfill cell was modeled in COMSOL. The results indicate that leachate recirculation can accelerate the decomposition of municipal solid waste (MSW) with food-rich waste content, relieving acidification, improving gas generation efficiency, and consequently, increasing the early settlement in landfills.

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Section: Introductionmentioning

confidence: 99%

Numerical Model of Leachate Recirculation in Bioreactor Landfills with High Kitchen Waste Content

Zhang

Liu

Jiang

et al. 2021

Water

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“…Ye’elimite, also known as tetracalcium trialuminate sulfate, is the dominant mineral in calcium sulfoaluminate (CSA) cement and exhibits high tailored dimensional expansion and early strength [ 1 , 2 , 3 ]. Since the 1970s, CSA cement has been widely used as a rapid repairing material and has recently been promoted for use in numerous domains, including soft soil stabilization and three-dimensional printing [ 4 , 5 , 6 ]. Moreover, CSA cement has been considered a promising alternative binder owing to its lower CO 2 emissions and energy consumption compared with Portland cement, in which ye’elimite plays an essential role [ 7 , 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

Phosphorus Substitution Preference in Ye’elimite: Experiments and Density Functional Theory Simulations

Zhao

Huang

et al. 2021

Materials

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Density functional theory (DFT) simulation has been recently introduced to understand the doping behavior of impurities in clinker phases. P-doped ye’elimite, a typical doping clinker phase, tends to form when phosphogypsum is used to manufacture calcium sulfoaluminate cement (CSA) clinkers. However, the substitution mechanism of P has not been uncovered yet. In this study, the influence of different doping amounts of P on the crystalline and electronic structure of ye’elimite was investigated using backscattered scanning electron microscopy–energy X-ray dispersive spectroscopy, X-ray diffraction tests, Rietveld quantitative phase analysis, and DFT simulations. Furthermore, the substitution preference of P in ye’elimite was revealed. Our results showed that increasing the doping amount of P increased the impurity contents in CSA clinkers, transforming the ye’elimite crystal system from the orthorhombic to the cubic system and decreasing the interplanar spacing of ye’elimite. Based on the calculation results of the defect formation energies, additional energies were required for P atoms to substitute Ca/Al atoms compared with those required for P atoms to substitute S atoms in both orthorhombic and cubic systems of ye’elimite. Combined calculation results of the bond length–bond order and partial density of states showed that the doped P atoms preferably substituted S atoms; the second possible substituted atoms were Al atoms, while there was only a slight possibility for substitution of Ca atoms. The substitution of P atoms for S atoms can be verified based on the elemental distribution in P-doped ye’elimite and the increasing residual CaSO4 contents. The transition of the crystal system and a decrease in the interplanar spacing for ye’elimite can also prove that the substitution of P atoms for Al atoms occurred substantially.

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“…At present, researchers have shown increased interest in pile design of pile-soil interaction [5][6][7][8][9]; however, it remains rough and ambiguous in reservoir areas due to limited awareness of NSF problems caused by water level changing periodically. Baihetan hydropower station, located in the lower reaches of the Jinsha River, stands as an important hydroelectric power station in China and offers electric power for the south-western area.…”

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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Analytical solution for longitudinal vibration of a floating pile in saturated porous media based on a fictitious saturated soil pile model

Cited by 166 publications

References 34 publications

Numerical Model of Leachate Recirculation in Bioreactor Landfills with High Kitchen Waste Content

Numerical Model of Leachate Recirculation in Bioreactor Landfills with High Kitchen Waste Content

Phosphorus Substitution Preference in Ye’elimite: Experiments and Density Functional Theory Simulations

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

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