Application of geosynthetics on low-volume roads

Keller, Gordon

doi:10.1016/j.trgeo.2016.04.002

Cited by 31 publications

(11 citation statements)

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“…There was a layer of permeable geotextile between the filter layer and the drainage layer of A2. During the operation of the bioretention system, the fine particle filler moving with the runoff cannot pass through the permeable geotextile and remains on the upper surface of the permeable geotextile, forming a structure in which the upper half of the gap was large and the lower half it was very less [33], so that the runoff can be infiltrated faster. The permeable geotextile can increase the moisture content of the filter layer filler after the end of the outflow, shortening both the internal wetting phase of the bioretention system and outflow start time.…”

Section: Water Quality Analysismentioning

confidence: 99%

Hydrologic and Pollutant Removal Performance of Media Layers in Bioretention

Yang

Liu

et al. 2020

Water

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The current study was aimed to investigate the filler layer structure in modified bioretention systems. Three different structural layers in bioretention were proposed to evaluate their hydrologic performance and pollutant removal efficiency under different rainfall intensities. These layers were as follows: all three layers (filter, transition, and drainage layers), without transition layer, and without drainage layer. Synthetic stormwater was used for experimental purpose in current work. Results revealed that compared with “all three layers”, runoff control rate of “without transition layer” and “without drainage layer” was reduced by 0 to 7.4%, 0 to 10.1%, and outflow start time was advanced by 6 to 8 min and 1.5 to 4.5 min, respectively. Moreover, CODcr (chemical oxygen demand), NH4+-N (ammonium nitrogen), TN (total nitrogen) and TP (total phosphorus) removal rates were 86.0%, 85.4%, 71.8%, and 68.0%, respectively. Particle size distribution of the fillers revealed that during operation, particle moved downward were mainly within 0.16–0.63 mm size. Findings showed that transition and drainage layer played an important role in runoff control, and total height of the filler layer should not be less than 800 mm. Filter layer effectively reduce runoff pollution but the thickness of the filter layer should not be less than 500 mm. Whereas, transition layer has the function of preventing the filler loss of the filter layer; therefore, proper measures must be taken into consideration during structural optimization.

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Section: Water Quality Analysismentioning

confidence: 99%

Hydrologic and Pollutant Removal Performance of Media Layers in Bioretention

Yang

Liu

et al. 2020

Water

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“…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%

“…Soil-filled geocells can provide a three-dimensional cellular reinforcement. Many authors (Dash et al, 2007;Madhavi Latha and Rajagopal, 2007;Ling, 2012, 2013;Tanyu et al, 2013;Moghaddas Tafreshi et al, 2013, 2016Hegde and Sitharam, 2015a;Indraratna et al, 2015;Biabani et al, 2016;Trung Ngo et al, 2016;Oliaei and Kouzegaran, 2017;Dash and Choudhary, 2018;Satyal et al, 2018) have shown that a geocell layer, due to the frictional and passive resistance developed at the soil-geocell interfaces, appears to derive substantial anchorage from both sides of the loaded area and, as a result, decreases soil surface settlement and increases bearing capacity. Thus, the use of geocell reinforcement in the buried pipe system, beneath the loading surface might not only considerably negate the tendency of an EPS block to increase soil surface settlement, but it could also cause more reduction in the transferred pressure over the pipe.…”

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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“…Most often these techniques of strengthening is performed in order to increase the resistance of roadway, to reduce the effects of appeared settlement and another external influence. In order to meet a number of functions that significantly contribute to the improvement of roadway performance and subgrade quality, geosynthetics are successfully used (Gradkowski, 2007;Kazimierowicz-Frankowska, 2013;Szczygielski & Stopa, 2014;Keller, 2016).…”

Section: Introductionmentioning

confidence: 99%