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Embankment stabilization

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Embankment stabilization

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Embankmentstabilization  Low-levelcrossingsandembankmentprotectiononfloodplainsLowcostwatercrossingsmaybedesignedusingNovaGabionsastheprotectionandsupportforfillmaterialduringperiodsofflooding.Thedesignprocedureshouldfollowtheguidelinesrecommendedabove.Embankmentsorcauseways,whicharesubjecttoovertoppingduringperiodsofflooding,aresusceptibletoerosiononthedownstreamside. ifadequateprotectionisnotprovided.TheuseofNovaMattressesandGabionsonboththeupstreamanddownstreamsideshasprovidedaneconomicmeansofprotectingembankmentsandcausewaysfromfailureduetoovertopping.Fordownstreamprotection,thedesignprocedureadoptedusingNovaMattressesandGabionsshouldfollowcloselythatforslopedweirs.TheNovaGabions(orMattresses)shouldbeginatthecrestoftheembankment(orcauseway)andextendsuchadistancedownstreamsoastopreventerosionoccurringinthevicinityoftheembankment.Forthesetypesofstructures,edgedetailingoftheNovaGabionsandMattressesisimportanttoensurefailureofancillarystructuresadjacenttotheedgesoftheprotectionlayerdonotoccur.Iftheembankmentsupportsastructureonitscrest(suchasaroadpavementorrailwaytrack)thentheupperextremityoftheprotectionlayershouldabuttheedgeofthecreststructure(roadpavementorrailwaytrack).Forexample,oneAustralianrailwayauthorityhasfoundthataNovaGabionplacedatthedownstreamedgeoftherailwayballastlayerpreventsthewashingoutoftheballastduringperiodsofflooding.Theedgedetailingoftheprotectionlayeratthedownstreamextremityisalsoimportanttoensureunderminingdoesnotoccur.EitheraNovaGabionshouldheusedhereortheNovaMattresslayershouldbeslopedintothewadibed.Toensuresatisfactoryperformance,theNovaGabionsandMattressesshouldbeconstructedinaccordancewiththemanufacturer’sspecification,particularlywithregardtotherockgradingusedinthebaskets.ThetopofNovaGabionballastprotectionunitsshouldbeaminimumof100mmabovetheadjacentraillevel.(AlargerNovaGabion,1.0mx1.0m,mayberequired,dependingondepthoftheballast/trackstructureandconditionoftheformation,inordertoobtainthisminimumclearance.)Theextentofprotectiondownstreamofthetoeoftheembankmentdependsuponindividualcircumstances.ItisrecommendedthatinallapplicationswhereNovaGabionsandMattressesareusedtoprovideprotectiontoembankmentsandcausewayssubjecttoover-topping,asuitablegeotextilefilterbeplacedbeneaththeNovaGabionsandMattresses–seeSection2.5.Ifproperlydesigned,NovaMattressesandGabionsprovideveryeffectiveprotectiontoembankmentsandcausewayssubjecttoover-topping.
发布时间 ：
2019/03/05 17:12
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Product description

Embankment stabilization

 

 Low-level crossings and embankment protection on flood plains

Low cost water crossings may be designed using Nova Gabions as the protection and support for fill material during periods of flooding. The design procedure should follow the guidelines recommended above. Embankments or causeways, which are subject to overtopping during periods of flooding, are susceptible to erosion on the downstream side.  

if adequate protection is not provided. The use of Nova Mattresses and Gabions on both the upstream and downstream sides has provided an economic means of protecting embankments and causeways from failure due to overtopping. For downstream protection, the design procedure adopted using Nova Mattresses and Gabions should follow closely that for sloped weirs. The Nova Gabions (or Mattresses) should begin at the crest of the embankment (or causeway) and extend such a distance downstream so as to prevent erosion occurring in the vicinity of the embankment.

For these types of structures, edge detailing of the Nova Gabions and Mattresses is important to ensure failure of ancillary structures adjacent to the edges of the protection layer do not occur. If the embankment supports a structure on its crest (such as a road pavement or railway track) then the upper extremity of the protection layer should abut the edge of the crest structure (road pavement or railway track). For example, one Australian railway authority has found that a Nova Gabion placed at the downstream edge of the railway ballast layer prevents the washing out of the ballast during periods of flooding. The edge detailing of the protection layer at the downstream extremity is also important to ensure undermining does not occur. Either a Nova Gabion should he used here or the Nova Mattress layer should be sloped into the wadi bed . To ensure satisfactory performance, the Nova Gabions and Mattresses should be constructed in accordance with the manufacturer’s

specification , particularly with regard to the rock grading used in the baskets. The top of Nova Gabion ballast protection units should be a minimum of 100 mm above the adjacent rail level . (A larger Nova Gabion, 1.0 m x 1.0 m, may be required, depending on depth of the ballast/track structure and condition of the formation, in order to obtain this minimum clearance.) The extent of protection downstream of the toe of the embankment depends upon individual circumstances. It is recommended that in all applications where Nova Gabions and Mattresses are used to provide protection to embankments and causeways subject to over-topping, a suitable geotextile filter be placed beneath the Nova Gabions and Mattresses – see Section 2.5. If properly designed, Nova Mattresses and Gabions provide very effective protection to embankments and causeways subject to over-topping.