红河断裂带测区古构造残余应力随深度分布X射线测量     

安欧  高国宝 《地震研究》1993,16(2):169-177

以岩体正交各向异性弹性理论为基础,用X射线衍射法,在红河断裂带测区,选用12个大口径钻孔用金刚石钻头钻取的岩芯,测量了岩体中三维宏观残余应力和微观残余应力及其弹性应变能密度随深度的分布,分析了它们沿深度的分布规律。  相似文献   

Improvements to Griggs-type apparatus for mechanical testing at high pressures and temperatures   总被引：2，自引：0，他引：2  

Tracy N. Tingle  Harry W. Green Jr.  Thomas E. Young  Ted A. Koczynski 《Pure and Applied Geophysics》1993,141(2-4):523-543

New and improved techniques and apparatus for testing the mechanical properties of materials at high presures and temperatures are described. These include an improved Griggs-type deformation apparatus designed to operate to 5 GPa and associated servo-controlled hydraulic drive and electronics, the design of hydrostatic (molten alkali halide mixtures) pressure assemblies to measure flow stresses as low as a few MPa, the characterization of temperature gradients and friction in such assemblies, measurement of the melting curve of an alkali halide mixture used as a confining pressure medium, and the measurement of acoustic emissions.  相似文献   

COMPARISON OF SINGLE-STATION LIGHTNING LOCATION WITH THREE-STATION MEASUREMENTS AND RADAR DATA          下载免费PDF全文

Tao Shanchang  Li Xi  Meng Qing  Liu Guangbao 《Acta Meteorologica Sinica》1993,7(2):232-243

A single-station or monostatic lightning detection and ranging system (M-LDARS),that is based on Wait's wave propagation theory and arrival-time differences between sky- and ground-wave atmospherics,has been developed by the University of Science and Technology of China (USTC).Lightning location by the system was compared with a three-station lightning location (TLL) system during July and August 1991 in Beijing,under the support of Chinese Academy of Meteorological Sciences (CAMS).The experimental results show that M-LDARS system can be used to observe direction,distance,intensity and polarity of cloud-to-ground strokes with good confidence for ranges less than about 250 km.90 percent of M-LDARS location points were within radar echoes,i.e.about 90% of the points were inside of the 0 dB isoline or outside,but within 10 km of the 0 dB isopleth.Average direction deviation and relative average deviation of distance between the single- and three-station measurements are respectively 12.8° and 14.1%.  相似文献   

围岩监控量测技术在浅埋大断面公路隧道中的应用   总被引：2，自引：0，他引：2       下载免费PDF全文

胡时友  姜昭群 《探矿工程》1994,(2):16-18

以安楚公路２、３号隧道围岩监测资料为基础，以进出口边玻和Ｋ７５＋４２０～Ｋ７５＋４３０段作为实例，介绍了应用监测技术提供的围岩变形信息来指导施工、确保安全的情况。  相似文献   

北京及其周围地区重力重复测量资料的研究   总被引：1，自引：0，他引：1  

马丽  李志雄 《地震地磁观测与研究》1994,15(5):10-17

针对北京及其周围地区重复重力测量资料所进行的重力非潮汐信息的处理程式，对该区１９８４－１９８８年期间重力变化机制进行了研究。结果表明，地下水位的变化是１９８４－１９８８年期间北京及其周围地区影响重力重复测量的主要因素。校正后的重力资料显示出，１９８７－１９８８年在北京以西地区策略变化比东部地区的变化幅值大。据分析，这种变化可作为研究１９８９年大同地震的地震孕育场依据之一。  相似文献   

滑坡体的射气测量     

徐建华 《地质科技情报》1994,13(3):90-93,98

探讨了放射性射气测量用于滑坡研究的基本原理，介绍了国外采用射气测量研究滑坡的几个实例，提出了几种比较适宜于研究滑坡体的射气测量方法并就其在三峡工程中的中应用前景进行了分析。  相似文献   

逐步波形反演方法及应用     

姚殿义  刘家琦 《中国地震》1994,10(3):230-237

本文针对天然地震波形反演面临的困难及其复杂性，提出了逐步波形反演方法，第一步，运用波形反演中的试错法，求得地震台站下方成层介质的初步结构；第地一步，以第一步结果为初值，令各层厚度不变，反演速度；第三步，以第二步结果为初值，令速度不变，反演厚度。以上各步还可交替进行，直至得到满意结果。  相似文献   

大同地区几次中强震前后的重力变化   总被引：5，自引：0，他引：5  

马丽  李家正 《地震工程学报》1994,16(1):33-39

本文对华北北环重力重复测量资料进行了分析研究，探讨了排除浅层干扰因素，提取与地震相关的重力变化的途径。以大同地震为例，详细分析了地震前后重力场变化，结果表明，其变化是明显的，远远超过了各项误差。  相似文献   

花岗岩类岩体中岩石包体应变测量方法讨论     

杨坤光 《地质科技情报》1993,12(3):98-104

以鄂东铁山、大王寨岩体为例,讨论了花岗岩类岩体中包体拟采取的应变测量方法,其中包括主应变值的测定、包体的原始轴比的确定以及包体与寄主岩存在明显粘性差条件下的应变测量方法。  相似文献   

Accretion rates on some debris slopes in the Mt. Rae area,Canadian Rocky Mountains   总被引：1，自引：0，他引：1  

James S. Gardner 《地球表面变化过程与地形》1983,8(4):347-355

Accretion of debris was monitored on six slopes in the Mt. Rae area of the Canadian Rocky Mountains for the period 1975–1982. Monitoring was accomplished by measuring annually the accumulated debris on fabric mats which were placed on the long profile of the slopes. Annual rates of accretion were extremely variable between points on the same slope, between slopes, and between years. The data do not show a systematic decrease in accretion downslope but indicate that an absence of accretion is more likely on the lower half of the slopes. In general, annual rates are comparable to previously published values from the Rockies and the maximum rates of 30 to 40 mm per year are comparable to those from Karkevagge in Scandinavia. Extremely high rates of accretion were all related to extreme events such as debris flows or full depth snow avalanches. The variation in accretion rates is not explained by single environmental factors such as lithology and slope exposure.  相似文献