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3D numerical study of the performance of geosynthetic-reinforced and pile-supported embankments
Soils and Foundations ( IF 3.3 ) Pub Date : 2021-08-06 , DOI: 10.1016/j.sandf.2021.07.002
Tuan A. Pham 1, 2 , Daniel Dias 3, 4
Affiliation  

Geosynthetic-reinforced and pile-supported (GRPS) systems provide an economic and effective solution for embankments. The load transfer mechanisms are tridimensional ones and depend on the interaction between linked elements, such as piles, soil, and geosynthetics. This paper presents an extensive parametric study using three-dimensional numerical calculations for geosynthetic-reinforced and pile-supported embankments. The numerical analysis is conducted for both cohesive and non-cohesive embankment soils to emphasize the fill soil cohesion effect on the load and settlement efficacy of GRPS embankments. The influence of the embankment height, soft ground elastic modulus, improvement area ratio, geosynthetic tensile stiffness and fill soil properties are also investigated on the arching efficacy, GR membrane efficacy, differential settlement, geosynthetic tension, and settlement reduction performance. The numerical results indicated that the GRPS system shows a good performance for reducing the embankment settlements. The ratio of the embankment height to the pile spacing, subsoil stiffness, and fill soil properties are the most important design parameters to be considered in a GRPS design. The results also suggested that the fill soil cohesion strengthens the soil arching effect, and increases the loading efficacy. However, the soil arching mobilization is not necessarily at the peak state but could be reached at the critical state. Finally, the geosynthetic strains are not uniform along the geosynthetic, and the maximum geosynthetic strain occurs at the pile edge. The geosynthetic deformed shape is a curve that is closer to a circular shape than a parabolic one.



中文翻译:

土工合成材料加筋和桩支路堤性能的 3D 数值研究

土工合成材料加固桩支撑 (GRPS) 系统为堤防提供了一种经济有效的解决方案。荷载传递机制是立体的,取决于连接元素(如桩、土壤和土工合成材料)之间的相互作用。本文介绍了使用土工合成材料加固和桩支撑路堤的三维数值计算的广泛参数研究。对粘性和非粘性路堤土进行了数值分析,以强调填充土的粘性对 GRPS 路堤的荷载和沉降效果的影响。研究了路堤高度、软土地基弹性模量、改良面积比、土工合成材料抗拉刚度和填土性质对拱形效果、GR膜效果、差异沉降、土工合成材料张力和沉降减少性能。数值结果表明,GRPS系统在减少路堤沉降方面表现出良好的性能。路堤高度与桩间距的比值、底土刚度和填充土特性是 GRPS 设计中要考虑的最重要的设计参数。结果还表明,填充土的内聚力增强了土拱效应,并提高了加载效率。然而,土拱动员不一定处于峰值状态,而是可以达到临界状态。最后,土工合成材料应变沿土工合成材料不均匀,最大土工合成材料应变出现在桩边缘。土工合成材料的变形形状是一种比抛物线更接近圆形的曲线。和沉降减少性能。数值结果表明,GRPS系统在减少路堤沉降方面表现出良好的性能。路堤高度与桩间距的比值、底土刚度和填充土特性是 GRPS 设计中要考虑的最重要的设计参数。结果还表明,填充土的内聚力增强了土拱效应,并提高了加载效率。然而,土拱动员不一定处于峰值状态,而是可以达到临界状态。最后,土工合成材料应变沿土工合成材料不均匀,最大土工合成材料应变出现在桩边缘。土工合成材料的变形形状是一种比抛物线更接近圆形的曲线。和沉降减少性能。数值结果表明,GRPS系统在减少路堤沉降方面表现出良好的性能。路堤高度与桩间距的比值、底土刚度和填充土特性是 GRPS 设计中要考虑的最重要的设计参数。结果还表明,填充土的内聚力增强了土拱效应,并提高了加载效率。然而,土拱动员不一定处于峰值状态,而是可以达到临界状态。最后,土工合成材料应变沿土工合成材料不均匀,最大土工合成材料应变出现在桩边缘。土工合成材料的变形形状是一种比抛物线更接近圆形的曲线。数值结果表明,GRPS系统在减少路堤沉降方面表现出良好的性能。路堤高度与桩间距的比值、底土刚度和填充土特性是 GRPS 设计中要考虑的最重要的设计参数。结果还表明,填充土的内聚力增强了土拱效应,并提高了加载效率。然而,土拱动员不一定处于峰值状态,而是可以达到临界状态。最后,土工合成材料应变沿土工合成材料不均匀,最大土工合成材料应变出现在桩边缘。土工合成材料的变形形状是一种比抛物线更接近圆形的曲线。数值结果表明,GRPS系统在减少路堤沉降方面表现出良好的性能。路堤高度与桩间距的比值、底土刚度和填充土特性是 GRPS 设计中要考虑的最重要的设计参数。结果还表明,填充土的内聚力增强了土拱效应,并提高了加载效率。然而,土拱动员不一定处于峰值状态,而是可以达到临界状态。最后,土工合成材料应变沿土工合成材料不均匀,最大土工合成材料应变出现在桩边缘。土工合成材料的变形形状是一种比抛物线更接近圆形的曲线。

更新日期:2021-09-30
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