凍土動態(tài)力學(xué)性能的實(shí)驗(yàn)研究.pdf

1、中國科學(xué)技術(shù)大學(xué)碩士學(xué)位論文凍土動態(tài)力學(xué)性能的實(shí)驗(yàn)研究姓名：陳柏生申請學(xué)位級別：碩士專業(yè)：工程力學(xué)指導(dǎo)教師：胡時(shí)勝20060601ABSTRACTFrozensoilisnormalinourdailylifo，itisabundantallovertheworldEverfrosttakesabout223％ofourcountryrankednumberthreeintheworldWiththedevelopmentoftheWe

2、stRegionswemustknowmoreaboutthedynamicsmechanicbehaviorsoffrozensoilfortheMineralsexploitationunderitandconstructionsoveritThebestwaytoknowdynamicbehaviorindetailistheSplitHopkinsonPressureBarFirs_吣，accordingtothetesting

3、environment，wedesignedanefficientrefrigerantsystemtontthefrozensoiltestinginSHPBByusingthenewfrozensystemtemperaturecanbecontrolledtofluctuateslowtoO1roundthetargettemperature，andtheresistancetemperaturewasplacedmuchclos

4、etothetestingsample，sotestingtemperaturecanindicatedtrulyandsamplesinthefrozenboxcanbefrozento一50in8minutesitismuchmoreefficientthanotherfrozensystemsSecondlyfrozensoilsampleswereinvestigateatstrainrate0001(1／s)，0ol(1，s)

5、in4di仟erenttemperaturesbyusingDaojinmaterialtestingsystemFinally，frozensoilsampleswereinvestigatedatstrainratesupto1450(1／s)andtemperaturesdownto一20‘。byusingtheSHPBTheresultsshowedthatfrozensoilexhibitsstrainrateeffect，t

6、emperatureeffect，dynamicbrittleandfrozenbrittlebehaviorThetemperatureandstrainrateeffectsindicate坩stimetemperatureequivalentpropertyAccordingtoresults。weconcludethatdynamicdestructionalformsoffrozensoilaremainlyarosefrom

7、flawsiniceConvergenceofstrainstresscurvesareinducedbyicecomminution，andoscillationofcurvesareinducebytheflaws’growth，flaws’spreadingandflawsarrestKeywords：frozensoil；refrigerantsystem；dynamicmechanicalbehaviors；SHPB；stra