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1、第42卷,第5期公路工程V01.42,No.50石灰改良膨脹土強(qiáng)度試驗(yàn)研究莊心善,彭偉珂,吳鏡泊(湖北工業(yè)大學(xué)土木建筑與環(huán)境學(xué)院,湖北武漢430068)[摘要]以南陽某公路試驗(yàn)段膨脹土為對(duì)象進(jìn)行石灰改良膨脹土強(qiáng)度試驗(yàn),研究了無側(cè)限抗壓強(qiáng)度、內(nèi)摩擦角及粘聚力與石灰摻量、養(yǎng)護(hù)齡期之間的關(guān)系。試驗(yàn)結(jié)果表明:無側(cè)限抗壓強(qiáng)度與石灰摻量成三次多項(xiàng)式關(guān)系,與養(yǎng)護(hù)齡期成線性關(guān)系,進(jìn)一步給出了考慮石灰摻量與養(yǎng)護(hù)齡期的無側(cè)限強(qiáng)度計(jì)算公式。內(nèi)摩擦角及粘聚力與石灰摻量均成線性關(guān)系,內(nèi)摩擦角與養(yǎng)護(hù)齡期成線性關(guān)系,石灰摻量為0時(shí)粘聚力與養(yǎng)護(hù)齡期成線性關(guān)系,石灰摻量不為0時(shí)粘聚力與養(yǎng)護(hù)齡期成二次多項(xiàng)式關(guān)系。石
2、灰對(duì)改良膨脹土粘聚力的影響很大而對(duì)內(nèi)摩擦角的影響很小,這是因?yàn)樵谑液团蛎浲令w粒之間主要產(chǎn)生灰結(jié)作用和凝聚作用以提高膨脹土的抗剪強(qiáng)度。給出了最優(yōu)摻灰量和最優(yōu)養(yǎng)護(hù)時(shí)間?!娟P(guān)鍵詞]膨脹土;石灰改良;無側(cè)限抗壓強(qiáng)度;養(yǎng)護(hù)時(shí)間;粘聚力【中圖分類號(hào)】U416.1+67[文獻(xiàn)標(biāo)識(shí)碼】A[文章編號(hào)】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引言膨脹土是一種吸水膨脹,失水收縮的高塑限粘土,含有大量的強(qiáng)親水性礦物成分蒙脫石和伊利石會(huì)給膨脹土地區(qū)工程建設(shè)帶來一系列工程事故和問題,如路面開裂、地基隆起、邊坡失穩(wěn)等,這些問題在國(guó)內(nèi)或國(guó)外均時(shí)有發(fā)生‘1’31。膨脹