資源描述:
《遼西風(fēng)積土特性及凍融后結(jié)構(gòu)性演變?cè)囼?yàn)研究》由會(huì)員上傳分享,免費(fèi)在線閱讀,更多相關(guān)內(nèi)容在學(xué)術(shù)論文-天天文庫。
1、Y8皇§7虬分類號(hào)TU411UDC....................................?密蝣,?公?開?編號(hào)?????學(xué)位論文THESISFORDEGREE遢蓐.凰積土.持推孱瀛。融后績.構(gòu).憔.演.變.遮艙溉窕.作者?~蓑??題??申請(qǐng)學(xué)位級(jí)別?碾?±一專業(yè)名稱..羞±.量程?LIAONINGTECHNICALUNIVERSITY遼+卜1:程技術(shù)人學(xué)碩士學(xué)僥論文摘要通過對(duì)風(fēng)積士的含水量、密度、比重、顆粒分布等指標(biāo)進(jìn)行測試、系統(tǒng)地研究了風(fēng)積土的物理性質(zhì)。通過對(duì)飽和土樣、擾動(dòng)土樣和原
2、狀土樣的固結(jié)試驗(yàn),發(fā)現(xiàn)在相同壓力下,飽和土樣的變形量最大,擾動(dòng)土次之,原狀土樣的變形量最小。申新地區(qū)風(fēng)積土的結(jié)構(gòu)屈服壓力大約為lOOkpa,用綜合結(jié)構(gòu)勢表示的結(jié)構(gòu)性參數(shù)在壓力達(dá)到結(jié)構(gòu)強(qiáng)度以的較高,而且隨壓力的增大略有提高。本文研究的風(fēng)積士與其它地區(qū)土的結(jié)構(gòu)性明顯不同。通過對(duì)風(fēng)積土的凍融試驗(yàn)研究,發(fā)現(xiàn)土體凍脹過程中,水分由暖端向冷端遷移,溫度和含水量對(duì)土體凍脹影響很大,凍融后土體的強(qiáng)度明顯發(fā)生變化。利用顯微鏡對(duì)土體的凍融過程進(jìn)行了觀測,發(fā)現(xiàn)由于水相變成冰體積膨脹,改變了土的微觀結(jié)構(gòu)。關(guān)鍵詞:風(fēng)積土結(jié)構(gòu)性
3、凍融強(qiáng)度孔隙遼1≯I:程技術(shù)人學(xué)頸士學(xué)俯論文AbstractThroughthetestofwatercontent,density,proportionandthedistributionofpelletofthewindwardsoil,hasstudiedthephysicalpropertyofthewindwardsoilsystematically.Throughthesolidifiesexperimentofthesaturatedsoilsample,thedisturbedsoil
4、sampleaJldtheundisturbedsoilsample,thedisplacementofthesaturatedsoilsampleisthebiggest,thedisturbedsoilisnextandtheundisturbedsoilsampleisthesmallestunderthesamepressurearediscovered.ThestructuresubmitspressureoftheaeoliansoilofFuxinareaisprobably100kpa
5、,theconstitutiveparameterexpressedbythecompositeconstructionpotentialishighbeforeitreachtoitsstructuralstrength,moreover,itincreasesalongwiththepressureslightly.Theaeoliansoilstudiedinthisarticleisdifferentwithotherlocalearthconstitutivepropertiesobviou
6、sly.Throughtheaeoliansoil’Sfreezingandthawingtestresearch,discoveredintheheaveprocessofsoilbody,themigrationtheofmoisturecontentisfromthewarmendtothecoldend,thetemperatureandthewatercontenthavegreatinfluencetothesoilbodyheave,afterthefreezingandthawingt
7、hesoilbodyintensityobviouslychanges.HascarriedontheobservationusingthemicroscopetOtheprocessoffreezingandthawingofsoilbody,discoveredthat:becausetheaqueousphasetllrnstheicevolumeexpansion,changedtheearthmicroscopicstructure.Keywords:theaeoliansoilstruct
8、urefreezing-thawingstrengthhole遼1j。}:科技術(shù)人學(xué)碩士學(xué)位論文1緒論1.1選題來源及意義本論文為國家自然科學(xué)基金項(xiàng)目“凍融和滲流耦合作用下風(fēng)積土路基結(jié)構(gòu)性演變的研究”的前部分工作,研究風(fēng)積土的物理性質(zhì),對(duì)風(fēng)積土的結(jié)構(gòu)性作全面的評(píng)判,并研究jxl積土在凍融過程中結(jié)構(gòu)性的變化。風(fēng)積土在我國分布范圍較廣,主要分布在東部季風(fēng)區(qū)、西北干旱區(qū)和青藏高原區(qū)。該種風(fēng)積土具有明顯的結(jié)構(gòu)性,特別是東北的區(qū)的風(fēng)積土,在季節(jié)性凍脹、應(yīng)力、含水量