Rapid Construction and Settlement Behavior of Embankment Systems on Soft Foundation Soils

Farnsworth, Clifton B.; Bartlett, Steven F.; Negussey, Dawit; Stuedlein, Armin W.

doi:10.1061/(asce)1090-0241(2008)134:3(289)

Cited by 60 publications

(15 citation statements)

References 3 publications

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“…Amongst the lowdensity materials, expanded polystyrene (EPS) geofoam (available in block form) is more uniform with fairly reliable engineering properties and its stress-strain behaviour is controllable and predictable. Thus, the use of expanded polystyrene (EPS) geofoam blocks as a compressible inclusion has sparked interest in several different geotechnical applications such as road embankments, reinforced walls, buried pipes and culverts (Duskov, 1997;Zou et al, 2000;Zarnani and Bathurst 2007;Farnsworth et al, 2008;Hatami and Witthoeft, 2008; Barrett and Valsangkar, 2009;Horvath, 2010;Newman et al, 2010;Bartlett et al, J. 2015;Witthoeft and Kim, 2015;Keller, 2016;Meguid et al, 2017a,b).…”

Section: Introductionmentioning

confidence: 99%

Combining EPS geofoam with geocell to reduce buried pipe loads and trench surface rutting

Tafreshi

Darabi

Dawson

2020

Geotextiles and Geomembranes

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This paper reports full scale experiments, under simulated heavy traffic, of geocell and EPS (expanded polystyrene) geofoam block inclusions to mitigate the pressure on, and deformation of, shallow buried, high density polyethylene (HDPE) flexible pipes while limiting surface settlement of the backfilled trench. Geocell of two pocket sizes and EPS of different widths and thickness are used. Soil surface settlement, pipe deformation and transferred pressure onto the pipe are evaluated under repeated loading. The results show that using EPS may sometimes lead to larger surface settlements but can alleviate pressure onto the pipe and, consequentially, result in lower pipe deformations. This benefit is enhanced by the use of geocell reinforcement which not only significantly opposes any EPS-induced increase in soil surface settlement, but further reduces the pressure on the pipe and its deformation to within allowable limits. For example, by using EPS geofoam with width 0.3 times, and thickness 1.5 times, pipe diameter simultaneously with geocell reinforcement with a pocket size 110×110 mm 2 soil surface settlement, pipe deformation and transferred pressure around a shallow pipe were respectively, 0.60, 0.52 and 0.46 times those obtained in the fully unreinforced buried pipe system. This would represent a desirable and allowable arrangement.

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Section: Introductionmentioning

confidence: 99%

Combining EPS geofoam with geocell to reduce buried pipe loads and trench surface rutting

Tafreshi

Darabi

Dawson

2020

Geotextiles and Geomembranes

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“…Several researches on EPS geofoam application in geotechnical projects such as road construction, buried pipe and culvert protection, retaining walls, etc. have been conducted Zou et al, 2000;Negussey, 2007;Farnsworth et al, 2008;Barrett and Valsangkar, 2009;Kim et al, 2010;Horvath, 2010;Stark et al, 2012;Tanyu et al, 2013;Anil et al, 2015;Bartlett et al, 2015;Keller, 2016;Witthoeft and Kim, 2016;Ozer, 2016;Beju and Mandal, 2017;Meguid et al, 2017a,b;Gao et al, 2017a,b;Shafikhani et al, 2017;AbdelSalam and Azzam, 2017;Mohajerani et al, 2017;Pu et al, 2018). To figure out the background of research with a special focus on road and highway embankments, the following summary is presented.…”

Section: Introductionmentioning

confidence: 99%

Behavior of expanded polystyrene (EPS) blocks under cyclic pavement foundation loading

Siabil

Tafreshi

Dawson

et al. 2019

Geosynthetics International

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This study introduces a mechanism for initial assessment and further development to improve understanding of EPS behavior as a super-lightweight material for road construction. Large scale cyclic plate load tests on model pavements were performed. The effect of several factors including thickness of soil, thickness of subsequent EPS layers and density of EPS on the surface deformations, resilient modulus (Mr) and interlayer pressure transfer were investigated. The results indicated that compared to a covering soil layer of 300 mm, the rut depth on the loading surface reduced by 13.5% and 40.8% when the soil thickness was increased by 33% and 100%, respectively. With a constant soil thickness, increasing the thickness of an upper (denser) EPS layer with respect to a bottom (softer) EPS layer, from 200 mm to 600 mm, would only result in a 20% decrease in the peak settlements at the loading. Resilient modulus of the system was found to be dependent on soil thickness and a designer can choose an appropriate resilient modulus assuming the soil-EPS composite acts as subgrade or subbase. In order to extend the results to a wider range of geofoams, soils and layer thicknesses, a simple stress analysis method was also trialed.

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“…Application of position‐sensitive detector might be an alternative solution, but it still suffers from measurement inefficiency of detecting the emitting light spots embedded in the freeway. Although the photometry scan techniques, such as terrestrial laser scanning and ground‐based light detection and ranging, become available more recently, these methods still need local calibrations (e.g., the GPSs or the displacement transducers) to provide high resolution and accurate measurements, but heavy traffics can induce interfering noises in this case.…”

Section: Introductionmentioning

confidence: 99%

Development and implementation of horizontal-plane settlement indication system for freeway health monitoring during underpass construction

Chung

Lin

Chin³

et al. 2017

Struct Control Health Monit

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Summary This study introduced two major contributions for freeway health monitoring during the pipe roof construction and subsequent excavation to enlarge an existing underpass. First, a horizontal‐plane settlement indication system (HSIS) was developed to monitor inevitable settlement due to shallow overburden above the steel pipes. Second, the experience gained from the field monitoring program was detailed with emphasis on encountered problems and countermeasures for freeway safety decision‐making. On the basis of two microelectromechanical systems tilt sensors embedded as a differential pair, HSIS effectively minimizes the effect of ambient temperature whose fluctuation was expected at shallow depth. The measurement accuracy (≤4 mm) and repeatability (≤0.05 mm) were verified experimentally. Thereby, three HSIS arrays were positioned in the freeway pavement to continuously detect local settlement and based on which to issue possible alarm. The RS485 data acquisition protocol, which is characterized by fast synchronized communication, was applied for HSIS to reduce the dynamic error due to heavy traffics. The observed settlement was close to the alarm threshold, which is considered as the combination effects of the simulated settlement and the penetrating deviation during the pipe roof construction. Furthermore, an approach to account for false vertical drift due to instability of the fixed point of HSIS was proposed such that the settlement behavior during excavation phase could be effectively described. The unique implementation is a benefit to further HSIS application in practice.

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Rapid Construction and Settlement Behavior of Embankment Systems on Soft Foundation Soils

Cited by 60 publications

References 3 publications

Combining EPS geofoam with geocell to reduce buried pipe loads and trench surface rutting

Combining EPS geofoam with geocell to reduce buried pipe loads and trench surface rutting

Behavior of expanded polystyrene (EPS) blocks under cyclic pavement foundation loading

Development and implementation of horizontal-plane settlement indication system for freeway health monitoring during underpass construction

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