資源描述：
《汶川震區(qū)地震動(dòng)三維地形效應(yīng)的譜元法模擬》由會(huì)員上傳分享，免費(fèi)在線閱讀，更多相關(guān)內(nèi)容在行業(yè)資料-天天文庫(kù)。
1、第47卷第4期蘭州大學(xué)學(xué)報(bào)(自然科學(xué)版)Vl01．47No．42011年8月JournalofLanzhouUniversity(NaturalSciences)Aug．2011文章編號(hào)：0455—2059(2011)04—0024—09汶川震區(qū)地震動(dòng)三維地形效應(yīng)的譜元法模擬胡元鑫，劉新榮1,2羅建華。，張梁，葛華1．重慶大學(xué)土木工程學(xué)院，重慶4000452．中國(guó)人民解放軍后勤工程學(xué)院建筑工程系，重慶4013113．重慶市地質(zhì)礦產(chǎn)勘察開(kāi)發(fā)局南江水文地質(zhì)與工程地質(zhì)隊(duì)，重慶4011214．中國(guó)地質(zhì)調(diào)查局成都地質(zhì)調(diào)查中心，成都61
2、0081摘要：針對(duì)三維波動(dòng)彈性動(dòng)力方程推導(dǎo)了譜元法算法，并考慮三維真實(shí)地形及介質(zhì)的衰減特性，基于并行計(jì)算環(huán)境采用譜元法和ASTERDEM模型對(duì)5．12汶川地震動(dòng)的地形效應(yīng)進(jìn)行了模擬．模擬結(jié)果表明陡峻地形對(duì)地震波兩個(gè)水平分量的影響要大于對(duì)豎向分量的．震中附近區(qū)域的PGA最大值為671cm／s，高PGA區(qū)多分布于山頂及山脊區(qū)域．與平坦地形相比，PGA相對(duì)地形放大系數(shù)為-12％~110％，不同地點(diǎn)的向速度分量波幅遵循峰頂、山脊得到放大或溝谷得到降低的模式．這說(shuō)明與已有的二維概化模型計(jì)算結(jié)果相比，三維真實(shí)地形對(duì)地震動(dòng)的影響比二維概化
3、模型更為復(fù)雜．關(guān)鍵詞：地震動(dòng)；地形效應(yīng)；譜元法；汶川地震中圖分類(lèi)號(hào)：P315文獻(xiàn)標(biāo)識(shí)碼：ASimulationofthree-dimensionaltopographicefectsonseismicgroundmotioninWenchuanearthquakeregionbaseduponthespectral-elementmethodHUYuan—xin。LIUXin—rong1,2LUOJian—hua3。ZHANGLiang，GEHua41．CollegeofCivilEngineering，ChongqingU
4、niversity，Chongqing400045，China2．DepartmentofArchitecture&CivilEngineering．PLALogisticsEngineeringCollege，Chongqing401311，China3．NanjiangHydrogeology&EngineeringGeologyBrigade．ChongqingBureauofGeologyandMineralsExploration，Chongqing401121，China4．ChengduCenterofChin
5、aGeologicalSurvey，ChinaGeologicalSurvey，Chengdu610081，ChinaAbstract：TheefectsoftopographyonseismicgroundmotionofWenchuanearthquakeweresimulatedbaseduponelastodynamicequationfor3Dwavepropagation，thespectral—elementmethod，ASTERDEMmodelandparallelcomputationenvironmen
6、tandincorporatedrealistic3Dtopographyandattenuationofmedia．Thesimulatedresultsshowthattopographicefectsduetogreatroughterrainontwohorizontalcomponentsofseismicwavearebiggerthanthoseonverticalcomponent．ThemaxPGAvalueinzonenearepicentreis671cm／s，whilelargePGAvaluesar
7、ealmostlocatednearmountaintopsandridges．Comparedwiththemodelwithouttopography，therelativetopographicamplificationfactorsofPGAinthezoneneartheepicentreare一12％一110％，whiletheZvelocitycomponentatdiferentsitesareinaccordancewiththepatternofamplificationonmountaintopsand
8、ridges，andthereisadecreaseinvalleysandbrooks．Itcanbeconcludedthattheefectsof3Drealistictopographyonseismicgroundmotionaremorecomplexthanthoseofth
