2.0GPa-室温至1160℃条件下安山岩纵波速度与相变          下载免费PDF全文

周文戈  谢鸿森  赵志丹  白武明 《地球科学》1999,24(3):261-264

利用ＹＪ－３０００ｔ压力机的弹性波速度测量装置在２．０ＧＰａ室温到１１６０℃条件下就位测量了湖北大冶陈贵安山岩纵波速度,并在相应条件下获取了实验产物,对其观察表明,对应着岩石弹性波速度的变化。实验样品已经发生了相变。  相似文献   

浅论不同应力状态下坝基层间剪切带弹性力学性质   总被引：1，自引：0，他引：1  

施建新 《水文地质工程地质》1999,26(2):45-47

本文以万家寨水利枢纽坝基Ｓｃｊ０８层间剪切带声波测试资料为依据,论述了不同应力状态下、剪切带弹性力学性质变化过程和机理,其成果对坝基施工过程控制和基础稳定性分析具有一定指导意义。  相似文献   

瞬态瑞雷波法在工程检测中的应用研究   总被引：2，自引：0，他引：2  

童立元  方磊 《水文地质工程地质》1999,26(6):52-56

本文简要介绍了瞬态瑞雷波法的工作原理,野外观测及数据采集系统,并总结出了资料处理解释流程图,同时从工程实践出发,探讨了该项新技术应用于高速公路建设中的优点,存在问题及未来发展趋势。  相似文献   

The application of a shift theorem analysis technique to multipoint measurements     

M. E. Dieckmann  S. C. Chapman 《Annales Geophysicae》1999,17(3):321-327

A Fourier domain technique has been proposed previously which, in principle, quantifies the extent to which multipoint in-situ measurements can identify whether or not an observed structure is time stationary in its rest frame. Once a structure, sampled for example by four spacecraft, is shown to be quasi-stationary in its rest frame, the structure’s velocity vector can be determined with respect to the sampling spacecraft. We investigate the properties of this technique, which we will refer to as a stationarity test, by applying it to two point measurements of a simulated boundary layer. The boundary layer was evolved using a PIC (particle in cell) electromagnetic code. Initial and boundary conditions were chosen such, that two cases could be considered, i.e. a spacecraft pair moving through (1) a time stationary boundary structure and (2) a boundary structure which is evolving (expanding) in time. The code also introduces noise in the simulated data time series which is uncorrelated between the two spacecraft. We demonstrate that, provided that the time series is Hanning windowed, the test is effective in determining the relative velocity between the boundary layer and spacecraft and in determining the range of frequencies over which the data can be treated as time stationary or time evolving. This work presents a first step towards understanding the effectiveness of this technique, as required in order for it to be applied to multispacecraft data.  相似文献   

太阳风中Alfven脉动耗散   总被引：5，自引：1，他引：4  

卢先和  魏奉思  刘四清  宋礼庭 《地球物理学进展》1999,14(Z1):1-24

本文从动力论Ａｌｆｖｅｎ 波理论出发, 导出太阳风中的Ａｌｆｖｅｎ 脉动的耗散长度理论由太阳向外传播的Ａｌｆｖｅｎ 脉动存在Ｌａｎｄａｕ 衰减和脉动串级数值计算表明, 该理论能够解释Ｂａｖａｓｓａｎｏ〔３〕等人描述的Ａｌｆｖｅｎ 脉动耗散长度与频率的关系; 同时还表明串级的时间尺度对耗散长度有影响  相似文献   

台湾海峡7.3级地震水震波特征研究   总被引：2，自引：2，他引：0  

庄光国 《地震》1999,19(2):199-203

台湾海峡７．３级地震是９０年代地震活跃期在我国的一个标志地震。根据全国８１口一观测井水震波资料,对其水位振荡、水位阶变、记震距离等方面作了分析。研究结果表明,本次地震显示水位振荡快衰减也快以及水位阶变多、幅度大和不存在最佳记震距离等主要特征,水震小存着丰富的地球信息内涵,这对地震孕育、发生信息的提取有其意义。  相似文献   

深部地应力探测技术理论探讨   总被引：7，自引：1，他引：6  

王文祥  杨宏宽 《地球物理学进展》1999,14(3):89-100

地应力测量的研究已有几十年的历史,但是对于地下深部地应力非钻孔式测量探测技术的发展,则一直进展很慢。本文依据天然电磁波场源,利用光弹实验模型原理,研制了ＤＹＬ型地应力探测仪,并在淮南地区地庆力状态普查过程中,取得了明显的应用效果。  相似文献   

双相介质中的地震波运动学特征   总被引：1，自引：0，他引：1  

周民都  李清河  张元生 《高原地震》1999,(4)

以 Biot理论为基础 ,推导了双相介质中弹性波的本构关系、运动方程及解。结果表明 :在均匀双相介质中可获得第一 P波、第二 P波和 S波。第一 P波近似于弹性介质中的 P波 ,第二 P波称为慢波 ,其速度一般小于 S波 ,但在个别介质模型中大于 S波。选择了合理的参数 ,对均匀双相介质中的波速进行了数值模拟  相似文献   

Application of Weibull model for redefined significant wave height distributions     

G. Muraleedharan  N. Unnikrishnan Nair  P. G. Kurup 《Journal of Earth System Science》1999,108(3):149-153

It is well accepted that the parent distribution for individual ocean wave heights follows the Weibull model. However this model does not simulate significant wave height which is the average of the highest one-third of some ‘n’ (n- varies) wave heights in a wave record. It is now proposed to redefine significant wave height as average of the highest one-third of a constant number (n-constant, say,n = 100) of consecutive individual wave heights. The Weibull model is suggested for simulating redefined significant wave height distribution by the method of characteristic function. An empirical support of 100.00% is established by Χ²-test at 0.05 level of significance for 3 sets of data at 0900, 1200 and 1500 hrs at Valiathura, Kerala coast. Parametric relations have been derived for the redefined significant wave height parameters such as mean, maximum one-third average, extreme wave heights, return periods of an extreme wave height and the probability of realising an extreme wave height in a time less than the designated return period.  相似文献   

不规则波远破波对直墙的作用   总被引：2，自引：0，他引：2  

李玉成  刘大中  齐桂萍  苏小军 《海洋学报》1999,21(2):99-107

基于物模试验、理论推理、因次分析和工程实例验证等综合分析方法,就不规则波远破波对直墙作用力的计算方法进行了研究,用推荐的方法得到的结果与工程实例符合较好.  相似文献