三峽—秦巴地區(qū)典型滑坡形成機(jī)理及演化過程研究.pdf

1、中國地質(zhì)科學(xué)院博士后學(xué)位論文三峽—秦巴地區(qū)典型滑坡形成機(jī)理及演化過程研究姓名：楊為民申請學(xué)位級別：博士后專業(yè)：地質(zhì)工程指導(dǎo)教師：吳樹仁20061101AbstractBasedOllfieldinvestigationsendlaboratorytestsfortypicallandslidesinthreegol譬esofYangtzeRiverandQiuiingDabeshan代衄andc∞mbtningwi脅researchre

2、sultofliteranm=inprintthisreportsummarizesthebaalcgeologjcalcharacterisgcsofloosedepositlandslideandrecklandslideandslidedebrisflowsystematicallyAccordingtogrowthanddistributionregulationsofthelandslidesintheregionofGehe

3、yanreservoiralongQingRiverofwes啪HubuitheonntrolfactorsoflandslideformationhasbeenanmyzodInallusiontogeologicalenvironraentandcharacteristicsofthetypicallandslide，theformationm∞hanlsmandevolvementprocessofthreekindsofland

4、slideshavebeenstudiedThewcakAmcharacteristicsoflandslidehasbeeninvestigatedwhenrockandsoilofslidem鼬meetwaterFurthermorethecomfimterelationshipoftherocksoilstrengthweakeninthelandslidehasbeenbuiltelementarilybymdm3ofdamag

5、emechanicstheoriesThemainlyconclusionsareobtainedasfollows：(1yrbestatisticalanalysesfortypicallandslidesshowthatthere啪manyinfluencingfactorsofslopestabilityHoweverforcertainspeciallandslideinncertainregionthereisonlyoneo

6、rtwokey蠡c幻颼forcontrollinglandslidestabilityForexampledeformationanddevelopmentofthelandslidesintheregionofOeheyanreservoiralongQingRiverw啪conuolledbyreservoirfluctuationandrainfallinrecenttenyearsFoliumaccumulationlandsl

7、idesofdebrisflowsinQingBaMoun切ineremainlycontrolledbyhighandsteepslopeandprecipitationrainfallMoreovermostofrocklandslides礬pfi刪Iydominatodbystmctmalface(cspeciallyslipfaceandborder)anditsstreng赴(2)Theloosedepositlandslid

8、einQingBaMmmminoocureintheQumemmylooseaccumulativelayerTherocksoilslructureofthelandslideislo慨Theslopeofaccumulativeformationc鯽formdoubleormultilayersslideunderthelmticuiarconditionThetintslipface，thatischiefslip臼∞，mainl

9、yoccursalongtheinterfacebctw∞naccumulativelayerandthebedrockwhilethesecmndmyslidefacesmybepotentialimerf讎which瓣arousedbypartsuh掘瑚∞differenceinaccumulativeI刪org峨senntr01Thus，thefollnmionandslidingregulationfainberesearche

10、dbyg∞logicalandmechanicalmodelsonmultislidingThecriticaldepⅡIofeveryslipfacec鋤bepredictedbythebuiltmodelGenerallythiskindoflandslideismostlycausedbY啊缸In咖andIongtimerainfallwhichwilltriggeranabruptlandslide徹ctimeorcreepsl

11、idesseveraltimes(3)ThegeologicalcharactodsticsofQianjiangpingandMaopingandTonzlmigoulandslidesshowthatrocklandslideusuallyocctm可intheregionwherevalleyiserodeddeeplyandcrustmovementrisesintensivelyTherockme∞structuresofth

12、elandslidemoctiymecataclasticanddispersalThemechanicalpcopeftyofthelandslidemostlyisp山ltypeearlierthenchangetopmhtypeTherocklandslidemostlyhashighpotentialcl礎(chǔ)f鼢soithasaquickslidingspeedandfarslidingdistanceafteritlosesit

13、sstabilityItisusuallytriggeredbyrainfallandreservoirfillingandcutslopeetcTheoccun℃f_ceoftheI‘ndslidemusthavethe翻【istedmuctoralplaneThereiscommonlyIoclappan(orfhchl伸fbu刪nhcad)inthefromed薩orslipfacebelowthelandslideBecxmse

14、theIockuppertis妯ea腳andthecentralizedshearstressisreleasedsoddenly’increasedrapidlyporewaterandairp∞端mofsfidezoncleadstoappear“aircushioneffect“11Ⅺgreatwaterandairpressuremakeseffectivestressofslipfacetodecreasetozeroandi