不同筋材界面剪切试验研究.pdf

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1、施工技术2017年1月上54CONSTＲUCTIONTECHNOLOGY第46卷第1期DOI:10.7672/sgjs2017010054*不同筋材界面剪切试验研究1，211111李丽华，高萌，罗诗哲，陈艳君，石安宁，文贝(1．湖北工业大学土木建筑与环境学院，湖北武汉430068;2．中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室，湖北武汉430071)［摘要］为了研究废旧轮胎、土工格室和土工格栅3种不同土工合成材料的筋-土界面抗剪特性，对试样开展了一系列大型直剪试验。对比了3种筋材的加筋效果，

2、并研究了竖向荷载对筋-土界面抗剪强度和剪应力-剪切位移曲线特征的影响。试验结果表明:筋-土界面的剪切应力与剪切位移关系为非线性;几种不同筋材加筋效果较为显著，其中废旧轮胎的加筋效果最为明显;筋-土界面的黏聚力提高较大，内摩擦角变化相对较小，表明筋-土界面主要依靠提高黏聚力增大其抗剪强度。确定了各筋材加筋界面抗剪强度指标，并分析了3种筋材的加筋机理。［关键词］直剪试验;土工合成材料;剪切特性;试验［中图分类号］TU458［文献标识码］A［文章编号］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