Soil arching evolution in GRPS embankments: Numerical spring-based trapdoor tests

IF 3.4 2区 工程技术 Q2 ENGINEERING, GEOLOGICAL
Ling Zhang, Mengchao Deng, Jie Zhou, Zeyu Xu, Shuai Zhou, Yunhao Chen
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Abstract

Soil arching is one of the main load transfer mechanisms of geosynthetic-reinforced and pile-supported (GRPS) embankments. This study established a numerical spring-based trapdoor model that can consider the coupling effect between embankment filling, horizontal geosynthetic, piles, and soft soil between piles by the discrete element method (DEM). The effects of multiple factors on the deformation pattern, load transfer, and the settlement at the top surface of GRPS embankments were analyzed, such as soft soil stiffness, geosynthetic stiffness, fill height, and pile clear spacing. The multiple spring-based trapdoor (MS-TD) model effectively replicated the actual deformation of soft soil between piles in engineering practice by elucidating the nonuniform settlement of the fill on the trapdoor. Although the geosynthetic indirectly reduces the load transferred to the pile top by weakening the soil arching, it can directly increase the load transferred to the pile top by the membrane effect, thereby increasing the total load transferred to the pile top. The effect of the geosynthetic on reducing settlement decreases with the increase of soft soil stiffness, and the displacement reduction ratio at the top surface remains unchanged when it exceeds a certain value. In addition, the shape of the soil arch evolves rather than unchanged during the growth of pile clear spacing.

GRPS 堤坝中土壤拱起的演变:基于数值弹簧的活门试验
土拱是土工合成材料加固和桩基支撑(GRPS)路堤的主要荷载传递机制之一。本研究通过离散元法(DEM)建立了基于弹簧的活门数值模型,该模型可考虑路堤填土、水平土工合成材料、桩和桩间软土之间的耦合效应。分析了软土刚度、土工合成材料刚度、填土高度和桩间距等多种因素对 GRPS 路堤顶面变形模式、荷载传递和沉降的影响。基于多弹簧的活门(MS-TD)模型有效地复制了工程实践中桩间软土的实际变形,阐明了活门上填土的不均匀沉降。虽然土工合成材料通过削弱土体拱起间接减少了传递到桩顶的荷载,但它可以通过膜效应直接增加传递到桩顶的荷载,从而增加传递到桩顶的总荷载。土工合成材料对沉降的减小作用随软土刚度的增加而减小,当软土刚度超过一定值时,顶面的位移减小比保持不变。此外,在桩清间距增长的过程中,土拱的形状会发生变化,而不是保持不变。
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来源期刊
CiteScore
6.40
自引率
12.50%
发文量
160
审稿时长
9 months
期刊介绍: The journal welcomes manuscripts that substantially contribute to the understanding of the complex mechanical behaviour of geomaterials (soils, rocks, concrete, ice, snow, and powders), through innovative experimental techniques, and/or through the development of novel numerical or hybrid experimental/numerical modelling concepts in geomechanics. Topics of interest include instabilities and localization, interface and surface phenomena, fracture and failure, multi-physics and other time-dependent phenomena, micromechanics and multi-scale methods, and inverse analysis and stochastic methods. Papers related to energy and environmental issues are particularly welcome. The illustration of the proposed methods and techniques to engineering problems is encouraged. However, manuscripts dealing with applications of existing methods, or proposing incremental improvements to existing methods – in particular marginal extensions of existing analytical solutions or numerical methods – will not be considered for review.
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