资源描述：
《毛乌素沙漠地区风积沙工程特性试验研究》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。
1、Researchonengineeringpropertiesofwind-blownsandintheMaowusudesertADissertationSubmittedfortheDegreeofMasterCandidate：GengNanSupervisor：Prof.ZhouZhijunChang’anUniversity,Xi’an,China摘要本文在沙漠地区选取典型沙样，系统地开展了风积沙工程特性试验研究，主要工作如下：（1）针对陕西、新疆、内蒙沙漠地区风积沙，开展了颗粒筛分和化学成份等物理化学试验。（2）对风积沙进行底部振动、表面振动及重型击实等试验。根
2、据不同表面压力、含水率、振动时间、振动频率及振幅等工况下的试验结果，提出了不同细颗粒含量（d≤0.074mm）时风积沙最大干密度确定方法，并对底部振动确定风积沙最大干密度时试验仪器、试验步骤及注意事项提出了明确要求。（3）风积沙的静力特性直接影响路基的强度和稳定性，其主要指标包括压缩模量、抗剪强度、加州承载比CBR及回弹模量等参数。试验过程中，通过变化风积沙的含水率及压实度等参数，得出含水率、压实度与静力特性指标之间的统计规律。（4）通过分析加州承载比CBR、压缩模量、抗剪强度、回弹模量等试验结果，得出了风积沙的压力——变形规律，其中风积沙在干燥状态下，应力——变形基本呈线
3、性关系，表现为弹性性质；含水率变化时，对风积沙单位变形具有一定影响。关键词：道路工程；风积沙；压实特性；静力特性；最大干密度iAbstractTypicalaeoliansandsamplesinMuUsdesertareawerechoosedandroadperformancetestresearchwassystematicallycarriedout,themainworkofthispaperisasfollows:(1)Firstly,theaeoliansandsamplesaretestedforbasicphysicalandmechanicalprope
4、rty,mainlyincludinggraincomposition,chemicalproperties,particleshape,etc.(2)Inordertostudycompactioncharacteristicofaeoliansandsample,heavycompactiontest,surfacevibrationcompactiontestandbottomvibrationcompactiontestiscarriedout.Parameterssuchasvibrationfrequency,amplitude,vibrationtime,su
5、rfacepressure,moisturecontentandgradationetcarechangedinbottomvibrationtest.Accordingtothetestresults,thedeterminationmethodofmaximumdrydensityofaeoliansandunderdiversegradingconditionsisconfirmed;testinstrument,testprocedureandtestcautionsaresummarized.(3)Thestaticbehaviorofaeoliansanddir
6、ectlycontroltheintensityandstabilityofaeoliansandsubgrade.ThestaticcharacteristicparametersincludingparameterssuchasCBR(Californiabearingratio),reboundmodulus,shearingstrengthandcompressionmodulusetc.Duringthetrial,bychangingparameterssuchasmoisturecontentofaeoliansandandcompactiondegreeof
7、aeoliansand,statisticallawamongmoisturecontent,gradationandstaticcharacteristicparametersareconcluded.(4)BasedontestresultsofCBR(Californiabearingratio),resilientmodulus,shearstrengthandmodulusofcompression,stressandstraindeformationlawofaeoliansandisconcluded
