資源描述:
《風(fēng)化砂改良膨脹土膨脹力試驗(yàn)研究.pdf》由會(huì)員上傳分享,免費(fèi)在線閱讀,更多相關(guān)內(nèi)容在應(yīng)用文檔-天天文庫(kù)。
1、第33卷第4期重慶交通大學(xué)學(xué)報(bào)(自然科學(xué)版)V01.33No.42014年8月0URNALOFCHONGOINGJIAOTONGUNIVERSITYfNATURALSCIENCEAug.2014dol:10.3969/j.issn.1674—0696.2014.04.22風(fēng)化砂改良膨脹土膨脹力試驗(yàn)研究楊俊,楊志,張國(guó)棟r,唐云偉。(1.三峽大學(xué)三峽地區(qū)地質(zhì)災(zāi)害與生態(tài)環(huán)境湖北省協(xié)同創(chuàng)新中心,湖北宜昌443002;2.三峽大學(xué)土木與建筑學(xué)院,湖北宜昌443002;3.宜昌市交通運(yùn)輸局,湖北宜昌443002)摘要:以湖北省宜昌市某
2、一級(jí)公路施工路段的膨脹土為研究對(duì)象,利用當(dāng)?shù)貜V泛分布的風(fēng)化砂來(lái)對(duì)膨脹土進(jìn)行改良。在膨脹土中分別摻入0%,10%,20%,30%,40%,50%的風(fēng)化砂,然后依次按照干密度為1.6,1.7,1.8。1.9,2.0g/cm]進(jìn)行制樣。通過(guò)室內(nèi)平衡加壓的方式,研究了不同的摻砂比例及不同的初始干密度對(duì)風(fēng)化砂改良膨脹土膨脹力大小的影響。試驗(yàn)表明:當(dāng)初始干密度相同時(shí),隨著風(fēng)化砂摻量的增加,膨脹力先緩慢增大后急劇減小,風(fēng)化砂摻量與膨脹力之間呈三次多項(xiàng)式的函數(shù)關(guān)系;當(dāng)摻砂比例一定時(shí),隨著初始干密度的增加,膨脹力逐漸增大,初始干密度與膨脹力之
3、間呈對(duì)數(shù)函數(shù)關(guān)系。摻砂比例越大,膨脹力減小的幅度越??;初始干密度越大,膨脹力減小的幅度越大。風(fēng)化砂能較好地抑制膨脹土的膨脹。關(guān)鍵詞:巖土工程;膨脹土;風(fēng)化砂;初始干密度;摻砂比例;膨脹力中圖分類號(hào):TU411.3文獻(xiàn)標(biāo)志碼:A文章編號(hào):1674—0696(2014)04-106.04SwellingForceofWeatheredSandofImprovedExpansiveSoilYangJun一,YangZhi一,ZhangGuodong一,TangYunwei(1.CollaborativeInnovationCent
4、erofGeologicalHazards&EcologicalEnvironmentinThreeGorgesAreainHubeiProvince,ChinaThreeGorgesUniversity,Yichang443002,Hubei,China;2.SchoolofCivilEngineering&Architecture,ChinaThreeGorgesUniversity,Yichang43002,Hubei,China;3.YichangTransportBureau,Yichang443002,Hubei
5、,China)Abstract:BasedontheexpansivesoilofacertainhighwayconstructionsectionofYichanginHubeiprovince,theweatheredsanddistributedwidelyatthelocalwasusedtomodifytheexpansivesoil.0%,10%,20%,30%,40%,50%0ftheweatheredsandwasmixedintoexpansivesoilrespectively.Sampleswerem
6、adesuccessivelyaccordingtothedrydensity,thatiS1.6.1.7.1.8,1.9。2.0g/em.Theinflueneeofdifierentsandratiosanddifferentinitialdrydensitiesontheswellingforceoftheweatheredsandmodifiedexpansivesoilwasresearchedbytheindoorbalancedway.Experimentsshowthat:whentheinitialdryd
7、ensityisthesame,withtheincreaseofweatheredsandcontent,theswellingforceincreasesslow—lyatfirstandthendecreasesrapidly,andtherearethreetimesofpolynomialfunctionrelationbetweenweatheredsandcon—tentandswellingforce;whenthesandratioisdetermined,withtheincreaseofinitiald
8、rydensity,theswellingforceincrea-sesgradually,andtherelationbetweeninitialdrydensityandexpansionforceislogarithmfunction.Thegreaterthesandra—tioi