高拱坝坝踵喷涂聚脲防渗层的性能与应用分析-(6271)

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1、高拱坝坝踵喷涂聚脲防渗层的性能与应用研究theinitialthicknesswhentheelongationof100％，about0．5timeswhentheelongationof300％．(2)Inordertoobtainthetensilefailuremorphologicalcharacteristicsofpolyureaelastomermaterial，thewholecoatingtensilefailuretestandscanningelectronmicroscopy(SE

2、M)forfracturewerecarriedout，thencombined研ththeuniaxialtensiletestresults，thedescriptionsofthemacroandmicroscopicfailurecharacteristicswhenuniaxialtension．thefailurecharacteristicswhentheoverallcoatingtensileweremade．111etestsresultsshowedthatpolyureaelasto

3、mermaterialinuniaxialtensionshowsatypicalsuper—elasticmaterialtoughnessfailurecharacteristics，thereissomereboundafterfractureandthepermanentdeformationislessthan0．4。Inthemicroscopicstate，thenaturalpolyureasurfacestructureshowsdensedefect，andthefracturechar

4、acteristicsoftensilefailureshowstypicalductilefractureandpermanentdeformationinasmallscale．it’Sconsistentwiththemacro—fracture。Theemergenceofneedleshapeholemarkedthetensilefailureofoverallpolyureacoating，thenholesexpandandconnectandeventuallycausethecoatin

5、gtotearfailure，tensilestrainisbetween500～600％whenemergenceofneedleshapeholeonpolyureasurface，it’Salsoconsistentwi廿1theresultsofquasi—statictensiletest．SOtheemergenceofaneedleholeasthesymbolofpolyureaanti-seepagecoatingisappropriate．(3)Acoatingresistanttowa

6、terpressuretestdevicewasself-designedandproduced．Thedevicehashighflexibility，onitsimulationofdifferentdegreescrackingcanbeachievedbyfastreplacementofspecimens，andthetimeofasingletestprogramisgreatlyshortenbyindependentspecimenandvolumespraying．Inthedevice，

7、Aorganicglasswindowswasdesignedtoensurereliableobservabilityandsecurity，andbeforeeachexperiment，postawater-solublefluorescentpaperandinstallacameravideoatthebottomofdevice．Accuratelyloadcanbeachievedwithhydraulicservosystemofhighprecisiontriaxialapparatus，

8、andtheloadofeachlevelispreciselyadjustable．Aencapsulationtestwascardedoutbeforethetest，andresultsshowedthattheoverallencapsulationofthedevicemeetthetestrequirements．onthisbasis，aback—pressurecurvewasplottedto