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

KONG Desen  LUAN Maotian  and WANG Weiming School of Civil Engineering  Harbin Institute of Technology  Harbin  P.R.China School of Civil  Architectural Engineering  Shandong University of Science  Technology  Qingdao  P.R.China Institute of Geotechnical Engineering  Dalian University of Technology  Dalian  P.R.China 《中国海洋大学学报(英文版)》2006,(1)

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.  相似文献   

FINDING CAUSES OF OUTLIERS IN MULTIVARIATE ENVIRONMENTAL DATA     

FOREST C.GARNER MARTIN A.STAPANIAN KIRK E.FITZGERALD Lockheed Engineering  Sciences Co.  E.Flamingo R  Las Vegas  NV  U.S.A. 《地理学报(英文版)》1991,(3)

Multivariate outliers in environmental data sets are often caused by atypical measurement error in a singlevariable.From a quality assurance perspective it is important to identify these variables efficiently so thatcorrective actions may be performed.We demonstrate a procedure for using two multivariate tests toidentify which variable‘caused’each outlier.The procedure is tested with simulated data sets that havethe same correlation structure as selected water chemistry variables from a survey of lakes in the WesternUnited States.The success rates are evaluated for three of the variables for sample sizes of 50 and 100,significance levels of 0.01 and 0.05 and various amounts of mean shift.The procedure works best forhighly correlated variables.  相似文献   

Research on ground heat exchanger of Ground Source Heat Pump technique     

LIUDong-sheng SUNYou-hong GAOKe WUXiao-hang 《东北亚地学研究》2004,7(2):196-199

Ground Source Heat Pump technique and its operating principle are described in this paper. Ground heat exchanger is the key technique of ground source heat pump and its pattems are discussed. Software is helpful to design ground heat exchanger. A project of Chinese Ground Source Heat Pump is introduced and its market is more and more extensive.  相似文献   

青藏高原多年冻土概论     

郭鹏飞  王健  边纯玉 《青海国土经略》1995,(2)

本文较系统地阐述了青藏高原多年冻土的地带性规律、冻土构造以及融区的类型和分布特征,详细论述了不同作用下形成的冻土(冰缘)地貌,并对青藏高原的冰缘期进行了初步划分与对比。  相似文献   

湖南有色金属生产矿山扩大接替资源的对策     

戴塔根 《地质通报》2005,(Z1)

湖南省境内有色金属矿产十分丰富,享有“有色金属之乡”的美誉,但经过多年的开采,90%以上的矿山都面临储量危机的困难,而找矿难度日益增大,常规的找矿技术路线已很难打开找矿效果不佳的局面。因此,在找矿预测过程中,必须以新的理论为指导,采用新的思路,从新的成矿与控矿因素、新的矿床成因类型与成矿模式入手,结合有效的常规手段与新技术,进行系统而科学的研究,并深入分析前人已有成果和投入大量现场调查研究工作,才有可能实现储量危机矿山找矿预测的突破。  相似文献   

铜陵凤凰山铜矿区角砾岩特征及其成因分析   总被引：3，自引：0，他引：3  

毛政利  杨斌  赖健清 《矿物岩石》2004,24(1):29-32

凤凰山铜矿区矿体附近不同类型角砾岩的分形统计分析结果表明,其中角砾状花岗闪长岩的形成以化学作用为主,其颗粒大小分布的分维值达到了1．389,说明其在形成过程中经历了机械破裂过程,其破裂过程中的能量达到中等。角砾状矿石和角砾状大理岩均为水力致裂角砾岩,角砾状矿石的颗粒大小分布的分维值(1．526)大于角砾状大理岩(1．24),指示了角砾状矿石形成时的能量大于角砾状大理岩。  相似文献   

风沙流中沙粒浓度分布的实验研究   总被引：9，自引：0，他引：9  

王洪涛  董治宝  张晓航 《地球科学进展》2004,19(5):732-735

利用粒子图像测速技术（PIV）,在风洞内对与天然沙接近的石英沙风沙流沙颗粒浓度沿高度分布进行了研究。对 3种不同轴线风速研究结果表明,风沙流中沙粒浓度沿水平方向基本不变,而随高度呈指数衰减,而且其衰减速率与风速密切相关。风速越大,衰减速率越慢;风速越小,衰减速率越快。风沙运动一旦发生时,靠近沙床表面的沙粒浓度随风速变化很小,可以认为趋于稳定,达到最大值。  相似文献   

Calculation of the Model of Coesite Inclusions and Analysis of Their Retrometamorphic Paths     

MENG Dawei  DING Xiaokun  WU XiulingFaculty of Materials Science  Chemical Engineering  China University ofGeosciences  Wuhan  Hubei Testing Centre  China University of Geosciences  Wuhan  Hubei 《《地质学报》英文版》2004,78(1):166-169

The process and path of retrometamorphism of coesite have great significance to our understanding of the P-T tracks of the exhumation of ultrahigh-pressure metamorphic rocks. Most of the coesites in the eclogite from Shima, Anhui Province, the Dabie Mountains, China, are found degraded to quartz partly or wholly, with ruptures occurring in the shells, outside which include the coesite and quartz. According to the microscopic observation, the sample of coesite inclusion is composed of garnet, quartz and coesite, based on which we have built a three-shelled composite sphere model to compute the transition of coesite. Based on the crystal growth formulas and pressure conditions of the ruptures in the garnet, we have calculated the radius of the quartz sphere, which depends on temperature, and eventually drawn the different retrometamorphic paths for different retrometamorphism rates.  相似文献   

Intracontinental Collisional Orogeny During Late Permian-Middle Triassic in South China: Sedimentary Records of the Shiwandashan Basin   总被引：2，自引：0，他引：2  

LIANG Xinquan  LI Xianhua  QIU Yuanxi Guangzhou Institute of Geochemistry  Chinese Academy of Sciences  Guangzhou  Guangdong Geoscience Department  Zhongshan University  Guangzhou  Guangdong 《《地质学报》英文版》2004,78(3):756-762

Sedimentary response to an orogenic process is important for determining whether South China had compressional or extensional orogeny during the period from the Late Permian to the Middle Triassic besides the tectonic and magmatologic evidence. An intracontinental collision event took place between the Yangtze and Cathaysia blocks in the Late Permian. Beginning at the Late Triassic, the tectonic movement was completely changed in nature and entered a post-collisional extensional orogenic and basin-making process. This paper presents sedimentological evidence from the Late Permian to the Middle Triassic in the Shiwandashan basin at the southwestern end of the junction zone between the Yangtze and Cathaysia blocks.  相似文献   

A Simple Monte Carlo Method for Locating the Three-dimensional Critical Slip Surface of a Slope   总被引：2，自引：0，他引：2  

XIE Mowen Institute of Environmental Systems  Kyushu University  Hakozaki --  Higashi Ku  Fukuok  Japan College of Resource Engineering  the University of Science  Technology Beijing  Xueyuan Ro  Haidian District  Beijing  China 《《地质学报》英文版》2004,78(6):1258-1266

Based on the assumption of the plain-strain problem, various optimization or random search methods have been developed for locating the critical slip surfaces in slope-stability analysis, but none of such methods is applicable to the 3D case. In this paper, a simple Monte Carlo random simulation method is proposed to identify the 3D critical slip surface. Assuming the initial slip to be the lower part of a slip ellipsoid, the 3D critical slip surface is located by means of a minimized 3D safety factor. A column-based 3D slope stability analysis model is used to calculate this factor. In this study, some practical cases of known minimum safety factors and critical slip surfaces in 2D analysis are extended to 3D slope problems to locate the critical slip surfaces. Compared with the 2D result, the resulting 3D critical slip surface has no apparent difference in terms of only cross section, but the associated 3D safety factor is definitely higher.  相似文献