云南省孟连西7.3级地震前跨断层形变反映   总被引：2，自引：0，他引：2       下载免费PDF全文

张兴华  宋金玲 《地球物理学报》1996,39(2):286-286

云南省孟连西７．３级地震前跨断层形变反映张兴华，宋金玲（云南省地震工程研究所，昆明６５０２０４）１９９５年７月１０日、１２日在滇西南孟连以西（北纬２２．１°东经９９．３°）连续发生Ｍｓ６．２级和７．３级强烈地震．１９９３年１月─１９９５年５月，云南中...  相似文献   

粘性土微结构形态要素及其定量信息处理技术   总被引：5，自引：1，他引：5  

胡瑞林  李向全  官国琳 《地球学报》1996,17(Z1):229-236

本文论述了粘性土微结构的形态要素及其层次关系，提出了11种结构参数并难予了相应的图像定义；以分形理论为基础确定了7项非线性结构要素的定量描述方法及其分维指标，并对其定量信息获取手段——粘性土微结构图象处理系统（MIPS）作了简要介绍。  相似文献   

活性石灰的工艺性能与方钙石的显微结构     

罗忠英  程玉保 《矿物岩石》1995,(2)

本文主要研究ＹＦ优质石灰石基本性能及其活性石灰的煅烧条件和方钙石的显微结构。结果表明煅烧温度和保温时间是影响活性石灰工艺性能及方钙石显微结构的决定性因素。  相似文献   

SSQ-1 Digital Tape Recording Horizontal Pendulum Tiltmeter     

Hu Zhu  Hai-Ying Feng  Fa-Cheng Gao  Zhong-Guo Tang  Biao Ouyang 《地震学报(英文版)》1993,6(4):1031-1039

The SSQ-1 Digital Tape Recording Horizontal Pendulum Tiltmeter is an instrument of high sensitivity to detect the changes of ground tilt. It uses a quartz horizontal pendulum held by Z?llner bifilar suspension to sense vertical displacement, the eddy-current transducer on the pendulum converts its displacements into electric signals. Then a microcomputer is used for data acquisition and printing as well as digit tape recording. And at the same time, a filtering pen recorder is used for visible recording. The scale value of the instrument is calibrated by computer using the known tilt angle of the bulging plate — mercury cup. The scale value is 0.3–0.5 m(″)/mV. The following are the testing results for the earth tide observation obtained from the east-west component at Baijiatan Seismic Station, Beijing: r(O₁): 0.6490±0.0179 α(O₁): −3.83°±1.58° r(K₁): 0.8049±0.0128 α(K₁): 1.40°±0.90° r(M₂): 0.6699±0.0040 α(M₂): −0.27°±0.34° r(S₂): 0.7316±0.0075 α(S₂): 2.83°±0.58° r(M₃): 0.8497±0.0964 α(M₃): 1.61°±6.51° The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,15, 353–359, 1993. In this work also participated Mr. Huai-Wen PAN and Wei-Jin ZHANG. And we here give special thanks to Yun-Zao XI, Qin-Wen XI, Bo-Xong TANG, Yi-Hui CHEN and An-Xu WU for their kind help in the development and test of the instrument. This paper is translated by Mr. Zhong ZHENG.  相似文献   

Diversification of skeletal microstructures of organisms through the interval from the latest Precambrian to the Early Cambrian     

冯伟民  陈哲  孙卫国 《中国科学D辑(英文版)》2003,46(10):977-985

From the latest Precambrian to the Early Cambrian was the most important phase throughout the evolutionary history of life on the earth. The diversification of latest Precambrian multicellular organisms was obvious and some of them began to form primary s…  相似文献   

多重分形在海积软土微观结构研究中的应用   总被引：2，自引：0，他引：2  

柳艳华  张宏  杜东菊 《水文地质工程地质》2006,33(3):83-87

本文将多重分形谱引入到土微观结构分形研究中,对天津市滨海新区三个不同地点海积软土原状样及不同固结压力后土中孔隙的多重分形特征进行研究,从多重分形的角度对孔隙的不均匀性进行定量描述,并建立孔隙多重分形谱各特征参数与荷载之间的关系.结果表明三个地点的海积软土孔隙多重分形特征存在差异.  相似文献   

海进体系域碳氧同位素地球化学响应——以黔西南地区三叠系为例     

李荣西  ;魏家庸  ;肖家飞  ;王兴理  ;Lehrmann DJ 《西安地质学院学报》2007,(1):1-5

层序地层研究表明，位于扬子地块西南缘的黔西南地区在中三叠世末期（相当于Ladinian-Carnian期）出现了一次与全球同步的大规模海侵，形成了一个向上变深的碳酸盐岩台地淹没沉积层序。垄头组顶部和竹竿坡组分别是海进体系域（TST）的下、上部分。碳、氧同位素研究表明，垄头组顶部自下而上δ（^18O）持续增大，而δ（^13 C）先逐渐增大，后在顶部界面附近快速下降，反映了垄头组顶部在暴露环境下氧化作用的结果。竹竿坡组δ（^13 C）自下而上逐渐增大，δ（^13 C）总体呈现逐渐减小趋势，反映了海平面变化特征。研究认为，海进体系域的δ（^13 C）和δ（^18 O）演化不但反映了海平面和沉积环境变化，同时对密集段（CS）、层序界面和古暴露面等也有很好的识别作用，在层序地层研究中具有重要的意义。  相似文献   

冻融循环对盐渍土黏聚力影响的试验研究   总被引：1，自引：0，他引：1  

陈炜韬  王鹰  王明年  李姝  王玉锁 《岩土力学》2007,28(11):2343-2347

通过室内试验,测试了冻融循环对不同含盐量和不同含盐类别盐渍土黏聚力的影响规律。从结晶体位置变化、微观结构、盐类性质及未冻结水含量三个方面分析了冻融循环对盐渍土黏聚力的作用机理。研究结果表明,在含水率一定的情况下,无论是向土中加入Na2SO4,或者是CaCl2,经冻融循环后黏聚力都随冻融次数的增加而减小,且第1次和第2次循环为主要减小阶段;加入CaCl2后黏聚力的减小程度比加入等量Na2SO4后小;冻融循环过程中结晶体析出时位置的变化是土体黏聚力和干密度减小的主要原因;经SEM图片分析,大孔隙占总孔隙面积的比例随冻融次数的增加而减小;盐渍土中CaCl2溶液的含量对冻融循环中黏聚力的变化有重要影响。  相似文献   

高速铁路地基黄土微结构的分形研究   总被引：1，自引：1，他引：1  

任权  王家鼎  袁中夏  谷天峰 《水文地质工程地质》2007,34(6):76-78,82

基于分形理论,结合Photoshop等图像分析处理软件,在图像处理过程中选择适当的阈值,本文对郑州—西安客运专线地基黄土在动荷载作用下变形前后的孔隙微观结构进行分形研究。研究表明,黄土孔隙微观结构具有分形特征,揭示了黄土孔隙分形分维同孔隙比之间有近似直线的关系,且孔隙微结构分形分维越大,土体强度越大,反之越小。  相似文献   

Geo-engineering properties of expansive soil treated with xanthan gum biopolymer     

Suresh Prasad Singh  Ritesh Das 《Geomechanics and Geoengineering》2020,15(2):107-122

ABSTRACT

This paper presents the effectiveness of xanthan gum (XG) biopolymer in stabilising the expansive soil. The XG biopolymer is mixed with expansive soil in different proportions such as 0%, 0.2%, 0.5%, 0.8% and 1.0% by weight of the dry soil mass. The plasticity, compaction, swelling, compressibility, hydraulic conductivity, strength and durability characteristics of the treated and un-treated expansive soil are examined. Results show that the plasticity index of the treated soil mass initially increases but beyond 0.5% biopolymer addition it decreases sharply. The optimum moisture content and maximum dry density of treated soil, found out from light and heavy compaction tests, do not follow any definite trend. It is also found that increasing XG content increases compressibility slightly but, it reduces swelling pressure, differential free swelling value and hydraulic conductivity remarkably. On the other hand, time-dependent compressive strength and resistance to mass loss increases with increasing XG content. Microscopic examination confirms the formation of gel-like linkage, which brings about the modifications in the treated expansive soil.  相似文献