简介：Thispapergivesemphasisontheresearchoftheproblemoflocalheadlossofcrossfractureflowbyalotofmodelexperiments,andatheoreticalmodeloflocalheadlossofcrossfractureflowisfoundedbyuseofthemomentumlawofwaterflow.Throughthecorrelationanalysisbetweenmodelexperimentalresultsandtheoreticalmodel,thecorrectioncoefficientoftheoreticalmodelisdefinite.Theproposedcalculationformulaoflocalheadlossofcrossfractureflowcanbeusedtoanalyzetheproblemofnetworkfractureseepage.

简介：Themovementofwaterflowinunsaturatedfracturedrockwasinvestigatedwiththesandstonesamplethroughexperimentalresearchandnumericalsimulation.Theexperimentalresultsshowthatthearrivingtimeofwettingfrontisdelayedbythefracture,resultingintheincreaseofwatersaturationinthedomainontheupstreamsideofthefracture,whichwilllocallyenhancewaterflowthroughthematrix.Thenumericalsimulationwiththefinitevolumemethodcaptureseffectivelythesecharacteristics.Thecomparisonbetweensimulatedandobservedtraveltimeandarrivingtimeofwettingfrontshowsthattheirdifferenceareverysmallandthesimulatedresultsareinagreementwiththeobservedresults,whichimpliescalibratedparametersarereliableandeffective.Thenaccordingtothecalibratedparameters,fracturedmodelswereestablishedtoexaminehowthechangeoflargefracturedaperturewouldaffectthearrivingtimeofwettingfronts,pressureheadsandwatersaturationontheupstreamanddownstreamsidesoffracture.

简介：TheflowthroughasinglefractureisnumericallystudiedbymeansoftheFluentSoftware.Theresultsshowthattheroughnessofthefracturesignificantlyaffectsthehydraulicconductivityinthefractureascomparedwiththecubiclawmodelwidelyusedtodescribetheflowbetweentwosmoothparallelplates.Anewmodelisproposedinthispaper,thenon-symmetricsinusoidalfracturemodel,tosimulatetheflowinarealfracture.Thismodelinvolvestwosinusoidal-varyingwallswithdifferentphasestoreplacetheflatplanesinthecubiclawmodel.Therelationshipsbetweentheeffectivehydraulicaperturesandthephaseretardationfordifferentrelativeamplitudesandwavelengthsarenumericallyinvestigated.Asimpleexpressionoftheeffectivehydraulicapertureofthefractureisobtained,togetherwiththelawoftheeffectivehydraulicapertureagainsttheamplitude,thephaseretardationandthewavelengthoftwosinusoidal-varyingwalls.