Comparative Analysis of Seismic Response Characteristics of Pile-Soil-Stnicture Interaction System

The study on the earthquake-resistant performance of a pile-soil-structure interaction system is a relatively complicated and primarily important issue in civil engineering practice. In this paper, a computational model and computation procedures for pile-supported structures, which can duly consider the pile-soil interaction effect, are established by the finite element method. Numerical implementation is made in the time domain. A simplified approximation for the seismic response analysis of pile-soil-structure systems is briefly presented. Then a comparative study is performed for an engineering example with numerical results computed respectively by the finite element method and the simplified method. Through comparative analysis, it is shown that the results obtained by the simplified method well agree with those achieved by the finite element method. The numerical results and findings will offer instructive guidelines for earthquake-resistant analysis and design of pile-supported structures.     

Spatial analysis of the impact of land-use on surface runoff and soil erosion-a case study of western Jilin

IntroductionNever before hasit beensotrue than now,thatlandis ali mitedresource.Population growth and as-sociated human activities,especially agricultureacross the world have not only led to land degrada-tion,but soil loss at rates that have pushed arablesoils to frontier thresholds.In the absence of arablesoil,the human environment would cease to groworeven demise(Ramet al.,2006).Studies haveshownthat in many regions of the world,runoff andsoil erosion differ withland-use type.Judson(1965)re…     

AN OVERVIEW ON THE URBAN-RURAL INTERACTION IN THE PAST 50 YEARS IN CHINA

１ＩＮＴＲＯＤＵＣＴＩＯＮＢｙｄｅｆｉｎｉｔｉｏｎｕｒｂａｎｉｚａｔｉｏｎｉｓｔｈｅｐｒｏｃｅｓｓｏｆｒｕｒａｌａｒｅａｓｃｈａｎｇｉｎｇｉｎｔｏｕｒｂａｎａｒｅａｓｉｎｎａｔｕｒｅｆｏｒａｓｏｃｉ-ｅｔｙｉｔｉｓａｎａｔｕｒａｌｌｙｈｉｓｔｏｒｉｃａｌｐｒｏｃｅｓｓｏｆｔｈｅｔｒａｎｓｉｔｉｏｎｆｒｏｍａｔｒａｄｉｔｉｏｎａｌｒｕｒａｌｏｒａｇｒｉｃｕｌｔｕｒａｌｓｏｃｉｅｔｙｔｏａｍｏｄｅｒｎｉｚｅｄｕｒｂａｎｓｏｃｉｅｔｙＧＡＯ１９９１．Ｉｎｂｒｉｅｆｉｔｒｅｐｒｅｓｅｎｔｓａ…     

加拿大伊佐克湖块状硫化矿床地质

伊佐克湖位于斯累夫构造区北部(北纬65度39分,西经112度49分),地处耶洛奈夫以北约225英里,科珀曼东南190英里。目前只能乘坐雪橇或装有浮筒的飞机去到那里。     

FORECASTING OF A NONLINEAR CASCADE FOR WATERSHED RUNOFF

Forecasting of a nonlinear cascade was developed for modeling watershed runoff, and was tested by computing the direct runoff hydrograph for two rainfall- runoff events on a small watershed in China . The forecasting model was superior to Ding s variable unit hydrograph method and the method of limited differences for these two events.     

计划与制定勘探程序

为寻找有实际意义的矿床,编写地质勘探计划,和确定勘探程序,就找矿小组而言,要求完成一些必要的基本活动.无论找矿小组是隶属于私人公司还是国家机构,也无论所找的是什么矿种或是在什么地区勘探,均须如此. 简单地说,要完成的工作包括: (1)规定勘探计划的目标.要找什么矿?     

石榴石表面的颤动痕可作为古沉积物冰川作用的指示

引言观察曾经历过冰川搬运的石榴石,可见到这些石榴石颗粒表面具有特殊的颤动痕,而非冰川搬运的石榴石却未见有这种特殊的痕迹。技术的应用正如Folk(1975),Gravenor,Mclelwain和Stupavsky (1978)和Gravenor(1979)所指出,未变动的具颤动擦痕的石榴石与冰川搬运距离具有函数关系。如     

根据激发极化数据估计硫化物含量

在四个斑岩铜矿床露天采掘坑中,对99处各种岩石和各种类型蚀变带上,进行了157次相位和电阻率测量,并从这些地方取回岩样在室内进行了化学分析,研究其蚀变特征和矿化特征,还确定了其硫化物含量.所得结果总地讲,随硫化物含量的增高,电阻率值降低,相位滞后增大.测得的数据很分散,无法总结出有用的规律.但如果取其相位与电阻率的比值,则可以使数据的分散性减小.因此,在许多情况下,可以用相位与电阻率的比值来确定硫化物的含量.其数理基础如下. 百分频率效应(PFE)和金属传导因数(MCF)的     

湖泊沉积物研究和利用的新见解

近几年来,苏联坚持不懈地和定向地实行自然资源合理利用和环境保护的措施。特别是湖泊天然资源的利用问题更为迫切,因为它对于发展渔业、提供动力和水源,灌溉农田以及寻找沉积矿床等具有重要的国民经济意义。在解决许多实际问题时,应用古植物学方法进行古地理研究具有重要的作用。