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1、交通荷載作用下西寧地區(qū)非飽和黃土動(dòng)力特性試驗(yàn)研究肖進(jìn)李輝張善俊蔣寧山馬艷霞青海大學(xué)土木工程學(xué)院曰本神奈川大學(xué)理學(xué)部摘要:為丫研究西寧地區(qū)非飽和黃土的動(dòng)力特性,文屮利用GDS動(dòng)三軸儀進(jìn)行室閃動(dòng)三軸試驗(yàn),研宂了不同振次、含水率和固結(jié)比對西寧地區(qū)非飽和黃土滯回圈、動(dòng)彈性模量,軸向應(yīng)變的影響。結(jié)果表明:當(dāng)振動(dòng)次數(shù)增加時(shí),滯回圈由應(yīng)變軸左側(cè)向右側(cè)移動(dòng),且由稀疏變得緊密,含水率、固結(jié)比越大滯回圈越靠近應(yīng)變大的方向;隨著含水率的升高非飽和黃土的動(dòng)彈性模量減小,軸向應(yīng)變增加;隨著固結(jié)比的增大動(dòng)彈性模量增大,軸向應(yīng)變也增大;動(dòng)彈性模量和固結(jié)比具有相同的增減特性,軸向應(yīng)變和含水率、固結(jié)比也都具
2、有相同的增減特性。研宂結(jié)果可為交通荷載作用下非飽和黃土地區(qū)動(dòng)力特性的研宄和防災(zāi)減災(zāi)提供參考。關(guān)鍵詞:交通荷載;動(dòng)三軸試驗(yàn);滯回圈;動(dòng)彈性模量;軸向應(yīng)變;作者簡介:肖進(jìn)(1991一),男,湖南懷化人,青海大學(xué)在讀碩士研宄生。作者簡介:李輝,E-mail:365329508@qq.com收稿日期:2017-05-12基金:清華大學(xué)水沙科學(xué)與水利水電工程國家重點(diǎn)實(shí)驗(yàn)室開放基金項(xiàng)目(sklhse-2016-D-02)ExperimentalstudyondynamicresponseofunsaturatedloessinXiningundertrafficloadXIAOJinL
3、IHuiZHANGShanjunJIANGNingshanMAYanxiaSchoolofCivilEngineering,QinghaiUniversity;FacultyofScience,KanagawaUniversity;Abstract:InordertostudythedynamiccharacteristicsofunsaturatedloessinXining,thedynamictriaxialtestwasconductedindoorusingGDSdynamictriaxialapparatus.Theeffectsofdifferentvibra
4、tiontimes,moisturecontentandconsolidationratiotohysteresisloop,dynamicelasticmodulusandaxialstrainofunsaturatedloesswereinvestigated.Theexperimentalresultsshowthat:whenthevibrationtimesincreases,thehysteresisloopmovesfromstrainaxislefttorightandfromsparsetotight.Thegreatermoisturecontentan
5、dconsolidationratio,thenearerthehysteresislooptolargestraindirectionis.Withtheincreaseofmoisturecontent,thedynamicclasticmodulusdecreasesandtheaxialstrainofunsaturatedloessincreases.Withtheincreaseofconsolidationratio,thedynamicelasticmodulusandaxialstrainincreases.Dynamicelasticmodulusand
6、consolidationratiohavethesamefeaturesofincreaseordecrease.Theaxialstrain,moisturecontentandconsolidationratiohavethesamefeaturesofincreaseordecrease.Theresearchresultscanprovidereferenceforthestudyofdynamiccharacteristicsanddisasterpreventionandmitigationofunsaturatedloessundertrafficload.
7、Keyword:trafficload;dynamictriaxialtest;hysteresisloop;dynamicelasticmodulus;axialstrain;Received:2017-05-12黃土是在干燥氣候條件下形成的多孔性具有柱狀節(jié)理的黃色粉性土,其分布面積相當(dāng)廣泛,主要分布在我國青海、甘肅、陜兩、山丙、寧夏等地,其中青海省黃土分布面積為2.48萬km2[l]。隨著我國西部人開發(fā)戰(zhàn)略的實(shí)施,西部經(jīng)濟(jì)得到丫空前的提升,公路,鐵路的修建更是達(dá)到丫一個(gè)新高度,公路、鐵路的修建不可避免的要穿越黃