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  • Thomas Telford Ltd.  (3)
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  • Thomas Telford Ltd.  (3)
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  • 1
    Online Resource
    Online Resource
    Long-term field performance of non-vegetated and vegetated three-layer landfill cover systems using construction waste without geomembrane
    Thomas Telford Ltd. ; 2022
    In:  Géotechnique
    Details
    In: Géotechnique, Thomas Telford Ltd.
    Abstract: This paper compares the field performance of non-vegetated and vegetated three-layer landfill cover systems utilising construction waste but without geomembrane at the Shenzhen Xiaping landfill site in humid climates over a monitoring period of 54 months. The top layer of each cover system was constructed using coarse-grained completely decomposed granite (CDG). The middle and bottom layers were compacted with coarse recycled concrete (CRC) and fine-grained CDG, respectively. Numerical analyses were also carried out. During the 54-month monitoring period, the cumulative rainfall recorded was 9800 mm. Retained pore water pressure in the vegetated cover was close to that in the non-vegetated cover after the heaviest rainfall recorded in Shenzhen during the monitoring period. The pore water pressure retained in the vegetated cover can be higher than that in the non-vegetated cover due to the increased saturated water permeability (k s ) induced by plant growth over 3 years. Surface runoff and water storage capacity in the vegetated cover were about five times and 9% higher than those in the non-vegetated cover, respectively. However, the long-term behaviour of the cover system in respect of these two aspects was influenced by the increase of k s due to the growth of grass roots. The middle CRC layer diverted infiltrated water by up to 51% of total rainfall. The measured average annual percolation of the non-vegetated and vegetated covers was about 23 mm and 21 mm, respectively. The measured data are supported by numerical analyses and they meet the US recommended criterion.
    Type of Medium: Online Resource
    ISSN: 0016-8505 , 1751-7656
    URL: Article
    DOI: 10.1680/jgeot.21.00238
    Language: English
    Publisher: Thomas Telford Ltd.
    Publication Date: 2022
    detail.hit.zdb_id: 240560-X
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  • 2
    Online Resource
    Online Resource
    An elasto-plastic numerical analysis of THM responses of floating energy pile foundations subjected to asymmetrical thermal cycles
    Thomas Telford Ltd. ; 2022
    In:  Géotechnique
    Details
    In: Géotechnique, Thomas Telford Ltd.
    Abstract: Although end-bearing energy pile foundations subjected to symmetrical thermal cycles have been extensively studied in the laboratory and in the field, the mechanisms underlying the thermo-hydro-mechanical (THM) interactions in floating energy pile groups and rafts, especially when subjected to asymmetrical thermal loads, are not well understood. In this study, an advanced thermo-mechanical bounding surface model was implemented in finite-element (FE) code to investigate the THM interactions of a two-by-two floating energy pile group and pile raft, focusing on asymmetrical thermal cycles. Computed results are compared with published centrifuge model test results in soft clay. It is revealed that the irreversible volumetric contraction of the soil adjacent to the energy piles accumulates with each thermal cycle, resulting in a decrease in the horizontal stress and hence shaft resistance of the floating piles. During thermal cycles, the stress states of the soil around the energy pile shaft and the soil beneath the pile toe approach the critical state line along different paths. The induced temperature in the soil adjacent to the non-energy pile (NEP) is 5°C lower than that in the soil at the energy pile EP1, which is flanked by the other two energy piles EP2 and EP3. Consequently, the induced excess pore pressure in the soil at the NEP is approximately 20% smaller than that in the soil at EP1. The irreversible volumetric soil contraction at the NEP is about half that at EP1, resulting in approximately 45% less toe settlement. The thermally induced ratcheting settlements of the head and toe of the NEP are less than those of the energy piles, resulting in unacceptable ratcheting tilting of the floating energy pile group. However, the excessive tilting can be reduced by the use of a pile raft.
    Type of Medium: Online Resource
    ISSN: 0016-8505 , 1751-7656
    URL: Article
    DOI: 10.1680/jgeot.22.00055
    Language: English
    Publisher: Thomas Telford Ltd.
    Publication Date: 2022
    detail.hit.zdb_id: 240560-X
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  • 3
    Online Resource
    Online Resource
    Unsaturated hydraulic properties of vegetated soil under single and mixed planting conditions
    Thomas Telford Ltd. ; 2019
    In:  Géotechnique Vol. 69, No. 6 ( 2019-06), p. 554-559
    Details
    In: Géotechnique, Thomas Telford Ltd., Vol. 69, No. 6 ( 2019-06), p. 554-559
    Abstract: Effects of plant roots on changes of soil hydraulic properties, including soil water retention curves (SWRC) and soil hydraulic conductivity functions (SHCF), are not well understood, especially when soil is unsaturated and vegetated with multiple plant species. The aim of this note is to quantify the root effects on both SWRC and SHCF of silty sand using the instantaneous profile method. Four types of vegetated soil, namely bare, grass-only, tree-only and mixed tree–grass silty sand, were subjected to a controlled drying–wetting cycle in a plant room. Plant roots affect the air-entry value, saturated hydraulic conductivity and reduction rate of unsaturated hydraulic conductivity (with respect to suction) most significantly, but the roots do not affect the reduction rate of volumetric water content much. When planted with single species (grass or tree), the air-entry value of silty sand increased, while the saturated hydraulic conductivity and reduction rate of unsaturated hydraulic conductivity with suction decreased. However, under the mixed planting conditions, opposite results are found.
    Type of Medium: Online Resource
    ISSN: 0016-8505 , 1751-7656
    URL: Article
    DOI: 10.1680/jgeot.17.T.044
    Language: English
    Publisher: Thomas Telford Ltd.
    Publication Date: 2019
    detail.hit.zdb_id: 240560-X
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