夯扩桩半模夯扩试验及夯扩机理探讨   总被引：6，自引：0，他引：6  

陈荣  俞季民 《岩土力学》1996,17(2):16-22

设计了夯扩桩半模夯扩试验，采用读数显微镜直接测读上体质点位移，获得了不同密度的均匀砂土中砂粒的位移，由此确定土体的位移场和密度场。借鉴魏西克（Ｖｅｓｉｃ）球形孔穴膨胀理论和梅耶霍夫（Ｍｅｙｅｒｈｏｆ）塑性剪切理论，结合模型试验成果，对夯扩机理作了探讨，并定性地提出了夯扩机理模式。  相似文献   

古潜山火成岩裂缝带划分与孔隙度计算   总被引：3，自引：0，他引：3  

李瑞  李能根 《物探化探计算技术》1996,18(2):167-170

针对火成岩岩性成分复杂，常规测井难以正确划分岩性，严重阻碍了储层参数的定量计算。本文提出模糊聚类划分岩性，采用综合概率法与混合体积模型计算裂缝孔隙度、有效孔隙度等参数。其测井解释结果与井壁取心和地质描述资料对照，完全吻合。  相似文献   

多电极直流探测系统及其应用效果   总被引：2，自引：0，他引：2  

李志武  周燕云  刘永东  贺宁波 《物探与化探》1996,20(6):461-470,473

本文介绍地质矿产部机电所研制的多电极直流探测系统的主要技术性能,硬件和软件设计特点,数据处理软件的配置以及在不同领域勘探应用实例。  相似文献   

泡沫泥浆钻进工艺及护壁堵漏机理研究          下载免费PDF全文

朱宗培  费立  陈礼仪  吴飞 《探矿工程》1996,(5):34-36

介绍了所研制的ＤＦ－１型泡沫剂组分及性能；对泡沫泥浆钻进的配方进行了研究，得出的最优配方应用于现场，取得了较好的效果，并对泡沫泥浆的护壁机理进行了研究。  相似文献   

地震和测井资料联合反演储层物性参数的方法   总被引：2，自引：0，他引：2  

沙磊  叶霞 《物探化探计算技术》1997,19(1):12-18

为了充分利用测井资料较高的纵向分辨率及其反映井壁周围物性直接准确的特点和地震资料良好的横向可追踪性，针对厚储层和薄储层地震—地质模型分别提出了利用测井和地震资料联合反演纵横波速度和密度参数的方法。理论模型的计算结果表明，反演方法是切实可行的  相似文献   

三维任意形体高密度电阻率法数值模拟方法     

杨文强 《物探化探计算技术》1997,19(3):270-273,278

为研究高密度电阻率法对各种三维地电体的反映规律，本文介绍了正演程序编制的方法并给出了计算实例。  相似文献   

地球物理反问题中的随机反演理论     

周竹生  陆江南 《物探化探计算技术》1997,19(4):289-297

本文从最大后验概率密度观点出发，在数据噪音向量和待求模型向量为具有零均值的独立高斯随机过程的假设前提下，建立起了随机反演的非线性系统方程；给出了模型方差估计的函数表达式，并在文章最后，证明了反演解的稀疏性，即解释了随机反演的输出解的高分辨率特征。文章在最小二乘反演方法的基础上，发展并完善了随机反演方法的理论基础；揭示了随机反演方法与最小二乘反演方法之间的本质区别；阐述了随机反演方法的优越性，并指出了其广阔的应用前景。  相似文献   

A bivariate meta-Gaussian density for use in hydrology   总被引：3，自引：0，他引：3  

K. S. Kelly  R. Krzysztofowicz 《Stochastic Environmental Research and Risk Assessment (SERRA)》1997,11(1):17-31

Convenient bivariate densities found in the literature are often unsuitable for modeling hydrologic variates. They either constrain the range of association between variates, or fix the form of the marginal distributions. The bivariate meta-Gaussian density is constructed by embedding the normal quantile transform of each variate into the Gaussian law. The density can represent a full range of association between variates and admits arbitrarily specified marginal distributions. Modeling and estimation can be decomposed into i) independent analyses of the marginal distributions, and ii) investigation of the dependence structure. Both statistical and judgmental estimation procedures are possible. Some comparisons to recent applications of bivariate densities in the hydrologic literature motivate and illustrate the model.  相似文献   

Methodical approach to distribution of epilithic and drifting algae communities in a French subalpine river: Inferences on water quality assessment   总被引：2，自引：0，他引：2  

Thierry Rolland  Stéphanie Fayolle  Arlette Cazaubon  Stéphane Pagnetti 《Aquatic Sciences - Research Across Boundaries》1997,59(1):57-73

In a sub-alpine river, the Asse, with an unpredictable discharge regime, chlorophyll, density and taxonomic diversity of both drifting and periphytic communities were studied from a methodical approach. The investigations based on stamping two close cross-sections to know their spatial distributions in a heterogeneous bed substrate showed a heterogeneous pattern of colonization mainly influenced by hydrological variables as the current velocity, the size of the substrata (gravel-pebble-boulder). For the drifting algae, mainly composed with benthic species temporarily unhooked to the substrata, the heterogeneity of the distribution was reduced in fast flow which induced a mixing of the whole mass of water. For the periphyton, some results indicated that the greatest diversity and the highest chlorophyll concentration were found on pebble substratum where the current velocity was moderate. These results have also shown that the classical methods used to day for investigations were inadequate for most Mediterranean rivers. It was really difficult to estimate the water quality from classical index created for use in regular large plain rivers.  相似文献   

The law of dislocation between two sides of active faults in China and their geodynamic force     

Shuangzhong Yu  Xungang Shi  Wenping Li 《中国科学D辑(英文版)》1997,40(6):613-620

By contrasting and analyzing the characteristics of gravity field nearby some important active faults in the continent of China, it can be found that the crust blocks where Bouguer anomalies are regionally positive (or relatively positive) are moving towards the terrestrial poles and the blocks where Bouguer anomalies in a tremendous area are negative (or relatively negative) are moving towards the equator. By analysis of mechanics and mathematics calculation and based on lots of practical data, the authors hold that the change in density of a crust block is a decisive factor that causes the horizontal movement of the continental crust, while magma activity is an important factor that leads to the change in density of a crust block.  相似文献