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ID:41120413
大小:937.03 KB
页数:9页
时间:2019-08-16
《加筋粗粒土直剪力学行为和颗粒破碎特性》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、加筋粗粒土直剪力学行为与颗粒破碎特性徐佳俊1,陈宇龙2,曾成华3,刘昌庚1,张士举1(1.攀枝花学院资源与环境工程学院,四川617000;(2.清华大学水沙科学与水利水电工程国家重点实验室,北京100084;3.攀枝花学院生物与化学工程学院,四川617000)摘要:粗粒土是一种天然填筑材料,在工程中应用广泛。大量学者对加筋粗粒土的力学性质进行了研究,但对直剪过程中颗粒破碎特性尚无人研究。本文采用大型直剪仪,对粗粒土和加筋粗粒土进行了直剪试验研究,研究了其直剪力学行为与直剪过程中的颗粒破碎特性。试验结果表明:粒径和垂直压力越大,峰值强度越大;加筋后,粘聚力均大幅提高,而内摩擦角
2、有一定程度的减小,粘聚力和内摩擦角均随着粒径的增大而增大;土工格栅除了受到与土的摩擦力外,还受到土体对横肋的阻挡力,阻挡力大幅提高了粘聚力;由不同方法计算得到的颗粒破碎率均随着垂直压力的增大而增大。垂直压力越大,颗粒间的接触越紧密,相互作用越剧烈,破碎率越大。同时在相同垂直压力下粒径越大,破碎越严重。加筋后颗粒破碎率显著降低,加筋可以有效防止颗粒破碎。关键词:粗粒土;加筋土;大型直剪;颗粒破碎中图分类号:TU44文献标志码:AMechanicalbehaviorsandparticlebreakagefeaturesofreinforcedcoarse-grainedsoil
3、indirectsheartestXUJiajun1,CHENYulong2,ZENGChenghua3,LIUChanggeng1,ZHANGShiju1(1.SchoolofResourcesandEnvironmentalEngineering,PanzhihuaUniversity,Sichuan617000,China;2.StateKeyLaboratoryofHydroscienceandEngineering,TsinghuaUniversity,Beijing100084,China;3. Chemistry EngineeringCollege,Panzh
4、ihuaUniversity,Sichuan617000,China)Abstract:Coarse-grainedsoilisnaturalfillingmaterialthatwidelyusedinengineering.Alargenumberofscholarshavestudiedthemechanicalpropertiesofreinforcedcoarse-grainedsoil,whiletheparticlebreakagecharacteristicsofcoarse-grainedsoilhavenotbeeninvestigatedyet.Inth
5、isarticle,mechanicalpropertiesandparticlebreakagecharacteristicsofcoarse-grainedsoilsandreinforcedcoarse-grainedsoilswerestudiedinlarge-scaledirectsheartests.Resultsshowedthatanincreaseinparticlesizeandverticalpressureproducedlargerpeakstrength.Reinforcedcoarse-grainedsoilshadincreasingcohe
6、sion,butdecreasinginternalfrictionangle.Cohesionandinternalfrictionangleincreasedwiththeincreaseofparticlesize.Besidesthefrictionbetweensoilandgeogrid,thecrossribproducedresistancetosoils,greatlyimprovingthecohesion.Particlebreakageindexesfromdifferentcalculationmethodsincreasedwiththeincre
7、aseofverticalpressure.Largerverticalpressureresultedinintensercontactbetweenparticles.Thestronginteractioncausedmoreparticlebreakage.Thereinforcementsignificantlydecreasedparticlebreakageindex.Themoreparticlebreakageoccurredwithlargerparticlesize.Reinfor
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