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1、施工技術(shù)2017年1月上54CONSTＲUCTIONTECHNOLOGY第46卷第1期DOI:10.7672/sgjs2017010054*不同筋材界面剪切試驗(yàn)研究1，211111李麗華，高萌，羅詩哲，陳艷君，石安寧，文貝(1．湖北工業(yè)大學(xué)土木建筑與環(huán)境學(xué)院，湖北武漢430068;2．中國科學(xué)院武漢巖土力學(xué)研究所巖土力學(xué)與工程國家重點(diǎn)實(shí)驗(yàn)室，湖北武漢430071)［摘要］為了研究廢舊輪胎、土工格室和土工格柵3種不同土工合成材料的筋-土界面抗剪特性，對試樣開展了一系列大型直剪試驗(yàn)。對比了3種筋材的加筋效果，
2、并研究了豎向荷載對筋-土界面抗剪強(qiáng)度和剪應(yīng)力-剪切位移曲線特征的影響。試驗(yàn)結(jié)果表明:筋-土界面的剪切應(yīng)力與剪切位移關(guān)系為非線性;幾種不同筋材加筋效果較為顯著，其中廢舊輪胎的加筋效果最為明顯;筋-土界面的黏聚力提高較大，內(nèi)摩擦角變化相對較小，表明筋-土界面主要依靠提高黏聚力增大其抗剪強(qiáng)度。確定了各筋材加筋界面抗剪強(qiáng)度指標(biāo)，并分析了3種筋材的加筋機(jī)理。［關(guān)鍵詞］直剪試驗(yàn);土工合成材料;剪切特性;試驗(yàn)［中圖分類號］TU458［文獻(xiàn)標(biāo)識碼］A［文章編號］1002-8498(2017)01-0054-04Study
3、onCharacteristicsofDifferentGeosyntheticsandSandInterfaceinDirectShearTest1，2111LiLihua，GaoMeng，LuoShizhe，ChenYanjun，11ShiAnning，WenBei(1．InstituteofCivilEngineeringandArchitecture，HubeiUniversityofTechnology，Wuhan，Hubei430068，China;2．StateKeyLaboratoryof
4、GeomechanicsandGeotechnicalEngineering，InstituteofＲockandSoilMechanics，ChineseAcademyofSciences，Wuhan，Hubei430071，China)Abstract:Inordertostudyontheinterfaceshearcharacteristicsbetweenreinforcementmaterialsandsoilofthreekindsofgeosyntheticsincludethescrap
5、tire，geocellandthegeogrid，aseriesoflarge-scaledirectsheartestareconductedonthesamples．Thereinforcementeffectofthreekindsofreinforcementmaterialsarecompared，andtheinterfacebetweenreinforcementmaterialsandsoildirectshearstrengthcharacteristicsandshearstress
6、-displacementcharacteristicsofgeosyntheticsunderdifferentverticalstressesareanalyzedcomparatively．Theresultshowsthat，therelationshipcurveofshearstress-displacementoftheinterfacebetweenreinforcementmaterialsandsoilisnonlinear，thereinforcementeffectofsevera
7、lreinforcedmaterialsaregreatandthemostsignificanteffectofmaterialisscraptire．Thecohesiveforceoftheinterfacebetweenreinforcementmaterialsandsoilincreasedgreatly，comparativelythefrictionanglechangesless，indicatedthattheshearstrengthimprovedmainlybyincreasin
8、gcohesionoftheinterfacebetweenreinforcementmaterialsandsoil．Theshearstrengthindexesofinterfacereinforcedsoilandthereinforcementmechanismofsoilaredetermined，andthereinforcedmechanismofthethreegeosyntheticsareanalyzed
