Cone model for two surface foundations on layered soil     

陈文化 《地震工程与工程振动(英文版)》2006,5(2):183-187

In this paper, the cone model is applied to the vibration analysis of two foundations on a layered soil half space. In the analysis, the total stress field in the subsoil is divided into the free-field and the scattering field. Seed＇s simplified method is adopted for the free-field analysis, while the cone model is proposed for analyzing the dynamic scattering stress wave field. The shear stress field and the compressive stress field in the layered stratum with two scattering sources are calculated by shear cone and compressive cone, respectively. Furthermore, the stress fields in the subsoil with two foundations are divided into six zones, and the P wave and S wave are analyzed in each zone. Numerical results are provided to illustrate features of the added stress field for two surface foundations under vertical and horizontal sinusoidal force excitation. The proposed cone model may be useful in handling some of the complex problems associated with multi-scattering sources.  相似文献   

Diagnostic study of apparent heat sources and moisture sinks in the south china sea and its adjacent areas during the onset of 1998 SCS monsoon   总被引：2，自引：0，他引：2  

Wang Shiyu  QianYongfu 《大气科学进展》2000,17(2):285-298

1.IntroductionItiswellknownthattheSouthChinaSea(SCS)monsoonisnotonlyamajormemberoftheEastAsianmonsoon,butalsohasanimportantfunctionontheweatherandclimateintheSouthChinaSea,theneighboringareasandtheworld.Manyscholarsathomeandabroadhavedonevariousresearchesaboutit.Jinngetal.(1993a,1993b)foundthatthetroposphericheatingincreasesabruptly,andtheheatsourcesandthemoisturesinksbecomestrongobviouslyinthesoutheasternTibetanPlateauandtheeastplainofChinawhentheSouthChinaSeamonsoononsets.Additionally…  相似文献   

Climate and floods in Central Europe since AD 1000: Data, Methods, Results and Consequences     

Rüdiger Glaser  Heiko Stangl 《Surveys in Geophysics》2004,25(5-6):485-510

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豫北某地岩溶水中氯化物污染原因初探     

仝长水  高义丰  聂新良  毕大园  孙继云 《水文地质工程地质》2004,31(5):68-71

本文简要介绍了豫北某地较为丰富的岩溶水资源及其氯化物升高的趋势，通过对制碱废渣的静溶和淋溶试验，分析了碱渣淋滤液的产生过程，同时分析了碱渣堆放场与该市岩溶水中氯离子浓度升高的关系，这将对渣场以后的废渣处理及周围的环境质量评价有极其重要的意义。  相似文献   

Variable Impact of the Subducted Slab on Aleutian Island Arc Magma Sources: Evidence from Sr, Nd, Pb, and Hf Isotopes and Trace Element Abundances   总被引：5，自引：0，他引：5  

JICHA  B. R.; SINGER  B. S.; BROPHY  J. G.; FOURNELLE  J. H.; JOHNSON  C. M.; BEARD  B. L.; LAPEN  T. J.; MAHLEN  N. J. 《Journal of Petrology》2004,45(9):1845-1875

Major and trace element compositions and Sr, Nd, Pb, and Hfisotope ratios of Aleutian island arc lavas from Kanaga, Roundhead,Seguam, and Shishaldin volcanoes provide constraints on thecomposition and origin of the material transferred from thesubducted slab to the mantle wedge. ⁴⁰Ar/³⁹Ar dating indicatesthat the lavas erupted mainly during the last  相似文献   

Chemical Composition of Urban Street Sediments and Its Sources     

Doris Stüben 《中国地质大学学报(英文版)》2004,15(1):75-83

INTRODUCTIONBeijingfacesseveredustpollutionduetosuchsourcesasdustimportedfromwesterndeserts,industryandpowerplants,domesticcombustionprocessesandtraffic .Inthelastdecades ,theurbanpopulationhasgrowntomorethan10million .TheeconomicgrowthofChinahasalsoleftitsfootprintsinBeijing .Newindustrialzonesanddomesticar easweredeveloped ,inducinganincreasingtrafficcirculation(Shi,2 0 0 1) .Thedroughtclimateinalmostthewholeyear ,thestrongmonsoonsinwinterbringingdustsfromtheGobidesert,theheavytraffic…  相似文献   

Caractérisation de zones sources de DNAPL à l'aide de traceurs bisolubles : mise en évidence d'une cinétique de partage     

Martine Bohy  Gerhard Schäfer  Olivier Razakarisoa 《Comptes Rendus Geoscience》2004,336(9):799-806

Pollution source characterization by the Partitioning Interwell Tracer Test method requires the assessment of the partitioning coefficient of the tracers with the pollutant. Experiments conducted on batch tests (static) and laboratory columns (dynamic) indicated a partitioning kinetics between the reactive tracer (4-methyl 2-pentanol) and the organic phase (trichlorethene); the partitioning coefficient decreases when the flow velocity through the porous medium increases. This partitioning kinetics has been confirmed by the interpretation of the tracer breakthrough curves with a first-order kinetic transfer model. To cite this article: M. Bohy et al., C. R. Geoscience 336 (2004).  相似文献   

基于高性能瞬变电磁辐射源的城市地下空间多分辨成像方法研究          下载免费PDF全文

李文翰  刘斌  李术才  李贺  鲁凯亮  李貅 《地球物理学报》1954,63(12):4553-4564

城市地下空间的高精度、多分辨探测是城市地下合理开发的前提.由于城市探测环境的特殊性,需要探测方法具备抗干扰能力强、分辨能力好、分异多尺度地下目标等特性,现有的物探方法难以兼顾城市地下空间的探测需要.本文利用三维矢量有限元方法为正演手段,在瞬变电磁高性能辐射源进行微分脉冲扫描的基础上,对探测数据进行多时窗的扫时波场变换,将微分脉冲扫描后的多分辨响应信息,进行多分辨信息提取.同时通过地震探测中的多次覆盖处理,提高探测场对地下目标的分辨能力,最后对多次叠加后的虚拟波场进行拟地震偏移成像,最终实现城市地下空间的高精度探测.  相似文献   

用模式识别方法划分辽宁及其邻区的潜在震源区   总被引：1，自引：0，他引：1       下载免费PDF全文

蒋秀琴  王国新 《地震地质》1993,15(1):51-56

采用Cora-3修改方法和Hamming方法对辽宁及其邻区的地震地质、地球物理场和地震活动性特征进行研究,划分了6级、6.5级和7级以上潜在震源区,两种方法所得结果基本一致。经k值试验、删除对象试验和删除特征试验,均表明结果比较稳定可靠。这一成果弥补了辽宁地区这方面工作的不足,并为确定辽宁及其邻区的潜在震源区提供了依据  相似文献   

Radiation from point sources in general anisotropic media   总被引：2，自引：0，他引：2  

Dirk Gajewski 《Geophysical Journal International》1993,113(2):299-317

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