資源描述：
《列車振動(dòng)荷載作用下原狀黃土動(dòng)力特性試驗(yàn).pdf》由會(huì)員上傳分享，免費(fèi)在線閱讀，更多相關(guān)內(nèi)容在行業(yè)資料-天天文庫(kù)。
1、第39卷第2期煤田地質(zhì)與勘探Vb1．39NO．22011年4月COALGB0】L()GY&E．0Rr10NApr．2011文章編號(hào)：1001—1986(2011)o2-0047—05列車振動(dòng)荷載作用下原狀黃土動(dòng)力特性試驗(yàn)萬(wàn)戰(zhàn)勝，楊，王家鼎(1．長(zhǎng)安大學(xué)公路學(xué)院，陜西西安710064；2．中煤西安設(shè)計(jì)工程有限責(zé)任公司，陜西西安，710054；3．西北大學(xué)地質(zhì)系大陸動(dòng)力學(xué)國(guó)家重點(diǎn)實(shí)驗(yàn)室，陜西西安710069)摘要：在動(dòng)三軸試驗(yàn)的基礎(chǔ)上，對(duì)列車振動(dòng)荷載作用下原狀黃土的動(dòng)力特性進(jìn)行研究。試驗(yàn)結(jié)果表明：原狀黃土在一定的動(dòng)應(yīng)力作用下，應(yīng)變隨著振次的增大而增大，隨固結(jié)應(yīng)力的增大而減小。應(yīng)變與動(dòng)應(yīng)力在一定
2、條件下近似為雙曲線模型。當(dāng)動(dòng)應(yīng)力比較小時(shí)，應(yīng)變與動(dòng)應(yīng)力呈近似的直線關(guān)系，但隨著動(dòng)應(yīng)力增大超過了某一臨界值時(shí)，原狀黃土所產(chǎn)生的應(yīng)變急劇增加，且增加速率隨著振動(dòng)次數(shù)的增加而增加。在一定的振動(dòng)次數(shù)下，土樣的應(yīng)變隨振動(dòng)頻率的增大而減小，且頻率越小的土樣越先出現(xiàn)轉(zhuǎn)折點(diǎn)。原狀黃土在固結(jié)應(yīng)力比為1時(shí)，動(dòng)彈性模量隨著動(dòng)應(yīng)變的增加而減小，且逐漸趨于穩(wěn)定。動(dòng)阻尼比隨應(yīng)變?cè)龃鬀]有明顯的增大趨勢(shì)，分布比較離散，但其值均在0．10～0．30的范圍以內(nèi)變化。關(guān)鍵詞：列車振動(dòng)荷載；原狀黃土；動(dòng)應(yīng)力；動(dòng)應(yīng)變；動(dòng)彈性模量；動(dòng)阻尼比中圖分類號(hào)：TU4文獻(xiàn)標(biāo)識(shí)碼：ADOI：10．3969／j．issn．1001—1986．20
3、11．02．O1lExperimentalstudyondynamicpropertiesofintactloessundertrainvibratingloadWANZhansheng．YANGZhe．WANGJiading(1．HighwayCollege，Chang~nUniversity，30'an710064，China；2．ChinaCoalXi"anDesigneeringCo．，Ltd,Xi'an710054，China；3．GeologicalDepartmentofNorthwestUniversity，StateKeyLaboratoryofContinentalDy
4、namics，Xi'an710069，China)Abstract：Basedonalotofdynamictriaxialtests．somedynamiccharacteristicsonintactloessunderthetrainvi．brationloadarestudies．Thetestresultsshowedthatwhentheintactloesswasundercertaindynamicstress，strainincreasedwiththeincreaseofthenumberofvibration．a(chǎn)nddecreasedwiththedecreaseof
5、consOlidatiOnstress．Therelationbetweenstressandstraincanbefittedwithhyperbolicmodelundercertainconditions．Whendynamicstresswassmaller,straincouldbefittedlinearlywithdynamicstress．Butwithdynamicstressincreasedmorethanacertainthreshold，strainofintactloesswouldbeincreaseddramatically．Andthegrowthrate
6、ofstrainincreasedwiththeincreaseofthenumberofvibration．Underthecertainnumberofvibration，strainofloessdecreasedwiththeincreaseofvibrationfrequency．Andthefrequencywassmaller，theturningpointappearedearlier．Dynamicmodulusofintactloessdecreasedwiththeincreaseofdynamicstrainandthetrendwasbasicallysimila
7、rwhenisequalto1．Dynamicdampingratiodidnothaveobviousincreasingtrendbuthadscatterdistributionwhenthestrainincreased．itsdiscretevalueswereintherangeof0．10to0．30．Keywords：trainvibratingload；intactloess；dynamicstress
