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ID:52221540
大小:1.57 MB
页数:5页
时间:2020-03-25
《石灰改良膨胀土强度试验研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第42卷,第5期公路工程V01.42,No.50石灰改良膨胀土强度试验研究庄心善,彭伟珂,吴镜泊(湖北工业大学土木建筑与环境学院,湖北武汉430068)[摘要]以南阳某公路试验段膨胀土为对象进行石灰改良膨胀土强度试验,研究了无侧限抗压强度、内摩擦角及粘聚力与石灰掺量、养护龄期之间的关系。试验结果表明:无侧限抗压强度与石灰掺量成三次多项式关系,与养护龄期成线性关系,进一步给出了考虑石灰掺量与养护龄期的无侧限强度计算公式。内摩擦角及粘聚力与石灰掺量均成线性关系,内摩擦角与养护龄期成线性关系,石灰掺量为0时粘聚力与养护龄期成线性关系,石灰掺量不为0时粘聚力与养护龄期成二次多项式关系。石
2、灰对改良膨胀土粘聚力的影响很大而对内摩擦角的影响很小,这是因为在石灰和膨胀土颗粒之间主要产生灰结作用和凝聚作用以提高膨胀土的抗剪强度。给出了最优掺灰量和最优养护时间。【关键词]膨胀土;石灰改良;无侧限抗压强度;养护时间;粘聚力【中图分类号】U416.1+67[文献标识码】A[文章编号】1674—0610(2017)05—0001—05ExperimentalStudyontheStrengthofLimeTreatedZHUANGXinshan,PENGWeike,WUJinbo(SchoolofCivilArchitectureandEnvironment,HubeiUnive
3、rsityofTechnology,WuhanHubei430068,China)[Abstract]TakingtheexpansivesoilofaNanyanghighwaytestsectionasthetestobjectforthelimeimprovedexpansivesoilstrengthtest.Therelationshipamongunconfinedcompressivestrength,in。ternalfrictionangle,cohesionandlimecontent,curingagewerestudied.Experimentalresu
4、ltsshowthattheunconfinedcompressivestrengthandtheamountoflimeintothreepolynomialrelationship,thean—confinedcompressivestrengthofalinearrelationshipwiththecuringperiod.Basedontheabovetwo,theformulaforcalculatingtheunconfinedstrengthoflimecontentandcuringageisgiven.Theinternalfric-tionangleandc
5、ohesivestrengthoftheimprovedexpansivesoilarelinearlyrelatedtotheamountoflime.Internalfrictionangleandcuringageintoalinearrelationshipbetweenthem,whentheamountoflimeis0,betweencohesionandcuringageintoalinearrelationship,whentheamountoflimeisnot0betweencohesionandcuringageintoquadraticpolynomia
6、lrelation.Theeffectoflimeonthecohesivestrengthofexpansivesoilisgreatandtheinfluenceonthefrictionangleofthemodifiedexpansivesoilisnegligible.ThisisbecausethatthelimeandexpansivesoilparticlesmainlyproducetheeffectofAshinteractionandAggregationinordertoimprovetheshearstrengthofexpansivesoil..Put
7、forwardtheoptimallimecon-tentandoptimalcuringtime.[Keywords]expansivesoil;Limetreated;nconfinedcompressivestrength;curingtime;cohesion引言膨胀土是一种吸水膨胀,失水收缩的高塑限粘土,含有大量的强亲水性矿物成分蒙脱石和伊利石会给膨胀土地区工程建设带来一系列工程事故和问题,如路面开裂、地基隆起、边坡失稳等,这些问题在国内或国外均时有发生‘1’31。膨胀
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