26205.層狀半空間中沉積谷地對(duì)斜入射平面波的三維散射

1、天津大學(xué)碩士學(xué)位論文層狀半空間中沉積谷地對(duì)斜入射平面波的三維散射姓名：任強(qiáng)強(qiáng)申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：防災(zāi)減災(zāi)工程及防護(hù)工程指導(dǎo)教師：梁建文201112ABSTRACTIthasbeenfullyverifiedthatadepositionalvalleyhassignificanteffectsontheseismicgroundmotionasalocalsiteSiteresponseanalysisofvalleywhichis

2、oneofthemostimportantlocalsites，hasbeenanattractiveresearchtopic，andha8animportanttheoreticalmeaningTheindirectboundaryelementmethod(IBME)isusedtosolvethet‘equencydomainsolutionof3Dscatteringofincidentplanewavesbyadeposi

3、tionalValIeYinalayeredhalfspace，analyzethedifferencesbetweenthecaseof2Dwavescatteringandthatof3D，anddiscusstheeffectoftheincidenceangleonsurfacedisplace：mentandtheeffectsofthestiffnessandthethicknessofthelayeronthedispla

4、cementbytakinganalluvialvalleyinonelayeroverhalfspaceasanexampleThepape。alsopresentsthescatteringofincidentRickerwavebyandepositionalvalleyintimedomainbvtheinverseFouriertransformonthebasisoffrequencydomain，andanalvsesth

5、etimedomainscatteringeffectofhorizontalincidenceangle，stiffnessandthicknessofsollItisshownthatthereisessentialdifferencebetweenthecaseof3Dwavescatteringandthatof2DSoweCaR’tsimplymaketheincidenceplanewavesintothedecomposi

6、tionofinplaneandantiplaneinthecrosssectionofthevalley，thencalculateandsuperposerespectivelyTheamplificationdependsonhorizontalincidenceangle，stiffnessandthicknessofsoilgreatlyAstheanglebetweenincidentdirectionandaxisofth

7、evalleyincreasesgraduallydisplacementofhorizontalandverticaldirectionchangesobviouslyStiffnessratiooftherockandsoilhasagreatinfluenceonthedisplacementamplitudenearthevalleybutaffectsthespatialdistributionlessThicknessofs

8、oilnotonlyaffectsthesurfacedisplacementamplitudes，butchangesthesurfacedisplacementofthespatialdistributionInthetimedomainscatteringeffect，vibrationdurationwithinthedepositionislongerthanthedepositionoutside，andhorizontal