采煤塌陷土壤水分變異及凍融特征.pdf

1、分類號S15學校代碼101299UDC65.020.01學號2011304017采煤塌陷土壤水分變異及凍融特征StudyonSoilWaterVariabilityThawFrozenprocessafterCoalMiningSubsidence申請人：包斯琴學科門類：農學學科專業(yè)：水土保持與荒漠化防治研究方向：荒漠化防治指導教師：高永教授論文提交日期：二〇一五年六月StudyonSoilWaterVariabilityThawFro

2、zenprocessafterCoalMiningSubsidenceAbstractThepapertookShendongCoalfieldindaliutaminingareaastheresearchobjectbyusingfieldtestsinsitumonitinglabatyanalysisexpledkeywaterholdingacteristicsvariationincoalminingsubsidenceof

3、soilseasonalfrozensoildepthsoilmoisturecontentdistributionmoisturemigrationacteristicsduringfreezethawprocessattemptedtorevealthecoalminingsubsidencefreezestagnantwatervariabilitymechanismsthusprovidingtechnicalsupptfari

4、dsemiaridsyareainecologicalrestationcollapserationalusageofwaterresources.Themainconclusionsareasfollows:Thecompositiononthewholeoftheparticlesinthestudyareawasmainlysiltfinesaveragesparticlecontentwasmethan85%within060c

5、msoilsiltOntheverticalsoilprofilewithsoildepthincreasingthecontentoffineparticleshadthesametrendaswell.Aftercoalminingsubsidencesurfacemicroenvironmentchangedsubsidencecoarsegrainedparticlesbecameprominent040layersofsoil

6、compositiononlycontainedswithroughsoiltextureverticalvariationofsoilparticlesshowedthatwithincreasesofdepththeparticlesbecamefiner.MiningSubsidencemadethesoilsubjectedtoexternalfcethusstructuredefmationloosedresultinginl

7、owersoildensitysoilbulkdensitydecreasedgreatlywithdepth.Soilposityincreasedwithsoildepthhadevidenttrend80100layersoilposityincreasedto41.38%from39.02%.Surfacesubsidenceresultindisturbancesthisdisturbanceoccurredineverysl

8、opeposition.thetopdlepositionofthehillwasthemostintense.Htonfmulafwindsinfiltrationratehadgoodapplicabilityunderthiscircumstance.Differentwidthofthecrackshaddifferentinfluenceonthesurroundingsoilstrengthshowingdifferents

9、patialvariabilityofsoilmoisturewiththecrackwidthincreasedthespatialvariabilityofsoilwatercontentincreased.ThespatialdistributionofsoilleveltrendsshowedcracksfartherawaythemecalmthemoisturechangewatercontentclosetoCVateve

10、rypointinthecrackshadthelowestwatercontent.Ftheseasonalfrozensoilsetcrackasthecenterasthehizontaldistanceincreasedthemaximumdepthoffrostedsoildecreasedtheexistenceofcracksaltereditsspatialdistributionofsoilfreezingwithin