Benefits of geosynthetic reinforcement in widening of embankments subjected to foundation differential settlement

Miao, Linchang; Wang, F.; Han, Jie; Lv, Weihua

doi:10.1680/gein.14.00019

Cited by 43 publications

(11 citation statements)

References 10 publications

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“…is section compares the results of the analytical calculations by this study and a rubber water bag trapdoor test conducted by Miao et al [35]. Di erent from the Villard and Briançon's [22] test, Miao et al [35] adopted a gradeddrainage subsidence manner to evaluate the reinforcing mechanism of the geosynthetic. e advantage is that the changes of displacement and stress of embankment and the response of reinforcing behavior can be recorded stepwise.…”

Section: According To the Initial And Boundary Conditionsmentioning

confidence: 93%

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Evaluation of Geomembrane Effect Based on Mobilized Shear Stress due to Localized Sinking

Lü

Zhang

Liu

et al. 2019

Advances in Civil Engineering

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Installing geosynthetic reinforcement at the bottom of the embankment will provide positive support for subgrade stability and settlement control, if there is a void or a weak foundation. In routine design work, the geomembrane effect must be well estimated and the tensile strain should be precisely predicted. Conventional analytical methods often adopt the limit state method to calculate the overlying load on the deflected geosynthetic. However, this assumption does not necessarily apply to all conditions, especially when the foundation soil can provide certain resistance. In this study, a semiempirical prediction method for evaluating the geomembrane effect of the basal reinforcement was proposed, and an iterative solution for calculating tensile strains of a deflected geosynthetic was deduced. In derivation, a virtual inclined slip surface and interaction between the geosynthetic and soil were quantitatively evaluated by coupling the arching effect and the geomembrane effect. Moreover, the development of shear stress along the slip surface can be considered, as well as different segments of the basal reinforcement. en, the proposed method was validated by two large-scale experiments. Comparison of the results of this method with measurements and results of other analytical models confirmed that this analytical method can take good care of the varying process of the localized sinking, regarding the overlying loads on the geosynthetic and the subsequent tensile strains.

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Section: According To the Initial And Boundary Conditionsmentioning

confidence: 93%

“…e rubber water bag trapdoor test conducted by Miao et al[35]. Comparison of load on the geosynthetic layer due to local subsidence.…”

mentioning

confidence: 99%

Evaluation of Geomembrane Effect Based on Mobilized Shear Stress due to Localized Sinking

Lü

Zhang

Liu

et al. 2019

Advances in Civil Engineering

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“…They showed that the geogrid reduces the differential settlement and horizontal displacement of new embankment combined with the sensitivity analysis by numerical simulation. A Laboratory physical model test of embankment conducted by Miao et al (2014) settlement by 20−30 mm, which indicates that the geogrid effectively reduces the differential settlement. Zhao et al (2019) investigated that the total settlement of embankment surface and lateral displacement after embankment construction are significantly reduced when prestressed tubular concrete (PTC) piles and geogrids were used to reinforce embankment.…”

Section: Research Progress Of Embankment Separated Widening and Isolating Wallmentioning

confidence: 98%

Design Optimisation Analysis of Isolating Wall for Separated Widening Embankment on Soft Ground

Jiang

et al. 2021

BJRBE

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In this paper, the typical cases of subgrade separated widening project in China are summarised. The research progress of subgrade separated widening and isolating wall applications are reviewed in highway reconstruction and extension. A numerical model is established based on the PLAXIS finite element software, considering both material nonlinearity and geometric nonlinearity. The effect mechanism of the isolating wall is discussed on the settlement control of the new and existing embankment on soft ground. The effect rule of the core design parameters of the isolating wall is revealed on the settlement disturbance of the existing embankment, such as location, depth, thickness and elastic modulus, and the weight rank of the influence is analysed. The results indicate that the isolating wall effectively reduces the lateral displacement and vertical settlement of the existing embankment, and there is an optimal design location for the isolating wall. In addition, with the increase of design parameters of the isolating wall, including depth, thickness and elastic modulus, the overall settlement of the existing embankment tends to be uniform, and there are optimal values. Furthermore, the depth of isolating wall is given priority, compared to location, thickness and elastic modulus during the isolating wall design process. The research results lay a theoretical foundation for the design optimisation of the isolating wall in the separated widening project of soft ground.

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“…Aslam (2009a, 2009b) varied the stiffness of the subsoil by using two grades of EPS in their centrifuge tests. Chen et al (2008b) and Miao et al (2014) modelled the consolidation of the subsoil in their tests by gradually draining water out from water bags. Only a few (such as Zaeske 2001;Heitz 2006;Le Hello 2007, Chen et al 2008b, and van Eekelen et al 2012) included geosynthetic reinforcement.…”

Section: Introductionmentioning

confidence: 99%

Scaled model tests on influence factors of full geosynthetic-reinforced pile-supported embankments

Song

Han

2016

Geosynthetics International

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A geosynthetic-reinforced pile-supported (GRPS) embankment that consists of embankment fill, geosynthetic, piles, and foundation soils is a complex soil-structure system. Its key load transfer mechanisms include soil arching and tensioned membrane effects and subsoil resistance. Type of embankment fill (cohesive or cohesionless) and type of pile (end-bearing or floating) are expected to affect these load transfer mechanisms; however, their influence has not been well investigated. Six scaled model tests were conducted in this study to investigate the influence of the embankment fill properties, the clear spacing of pile caps, and the pile type on soil arching and tensioned membrane effects. This study used cohesive and cohesionless embankment fills and end-bearing and floating piles. The test results show that the cohesive embankment fill strengthened the soil-arching effect, increased the pile efficacy, and reduced the settlements of the subsoil between pile caps and the embankment crest under the same load as compared with the cohesionless embankment fill. The soil arching-effect was inversely proportional to the clear spacing of pile caps. Soil arching initiated at a low ratio of the embankment height to the clear spacing of pile caps (i.e. 0.5 to 0.7) and became stable at a higher ratio (i.e. 1.1 to 1.5). The embankment height when the soil arching becomes stable is also referred to as the critical height, at which full soil arching is formed. The measured vertical earth pressures at the edges of the pile caps were higher than those in the middle of the pile caps in all six model tests. When the end-bearing or floating piles were used, the loads on the piles (i.e. the pile efficacy) increased during the construction of the embankment. However, when the floating piles started to penetrate into the underlying soil under a higher load; the pile efficacy decreased with the embankment and the surcharge load. Floating piles resulted in less soil arching and larger settlement.

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Benefits of geosynthetic reinforcement in widening of embankments subjected to foundation differential settlement

Cited by 43 publications

References 10 publications

Evaluation of Geomembrane Effect Based on Mobilized Shear Stress due to Localized Sinking

Evaluation of Geomembrane Effect Based on Mobilized Shear Stress due to Localized Sinking

Design Optimisation Analysis of Isolating Wall for Separated Widening Embankment on Soft Ground

Scaled model tests on influence factors of full geosynthetic-reinforced pile-supported embankments

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