KZWY91—1000型钻孔瓦斯压力测定仪的应用   总被引：2，自引：0，他引：2  

孟钧周  王合贤 《煤田地质与勘探》1994,22(2):61-64

通过对山西省云台山5次瓦斯测压试验,系统介绍了钻孔瓦斯压力测定仪的结构、工作原理和测试程序。并从测压泥浆质量管理、提高封孔效果和把握卸压环节总结出一整套测试经验。分析了测试原理、各主要部件性能、成功率高低、经济效益等。   相似文献   

河北省变质核杂岩   总被引：8，自引：0，他引：8       下载免费PDF全文

傅朝义 《地质找矿论丛》1999,9(3):10-16,49

河北省变质核杂岩形成于中一新生代,围绕华北拗陷盆地呈环带状分布在太行山,燕山地区。分为穹状和长垣状两种。同美国科迪勒拉式变质核杂岩相比,在主拆离断层内缺失巨厚的韧性剪切带。其形成的动力机制包括岩浆底辟、区域大陆伸展和地幔（亚）柱上隆作用。  相似文献   

YCOⅡ型岩心定向钻具          下载免费PDF全文

马克新 《探矿工程》1999,(4):6-7

分析了岩心定向钻具的作用和应用前景,介绍了ＹＣＣ－Ⅱ型岩心室向钻具的工作原理及性能特点,并就其工业性生产应用作了总结与分析。  相似文献   

MZ150型全液压多功能锚杆钻机的研制          下载免费PDF全文

潘淑璋  郑午  郑治川  王智明 《探矿工程》1999,(2):6-8

ＭＺ－１５０型全液压多功能锚杆钻机由变角机构、动力头回转机构、给进机构等几部分组成,采用液压传动方式,对钻机的总体方案,机构设计及主要参数作了介绍。亲机经过工业性试验,效果良好。  相似文献   

承受负摩擦力的桩基沉降计算的迭代法   总被引：12，自引：1，他引：11  

赵锡宏  张启辉  张保良 《岩土力学》1999,20(2):17-21

结合负摩擦力产生的机理,认为软土地区的桩基的负摩擦力问题主要是沉降问题,而不是强度问题。利用半理论半经验的桩基沉降计算方法［１］ ,对承受负摩擦力的桩基的中性点及桩基的沉降、桩的分担比进行简单的迭代计算,由此可确定承受负摩擦力的桩基的沉降,计算结果与实测结果的对比表明,该法简单可行。  相似文献   

外地核中U、Th的分布、核裂变及其对地球动力学的影响   总被引：1，自引：1，他引：0  

鲍学昭 《地质论评》1999,45(7):82-92

笔者认为地球的外地核中存在大量的生热元素U和Th,它们正是驱动地球内部物质运动、包括板块运动的主要动力。按照地震波资料,地球内部最热的地区在太平洋中部,地磁资料表明地磁中心及相应的热对流中心也向太平洋板块偏离400km,因此U、Th更多地富集在太平洋之下的外地核中。前寒武纪天然核反应堆的发现及行星质量与光度的研究显示,外地核中的U、Th存在周期性核裂变,太平洋热点火山岩及其包体中富集与U、Th核裂变或衰变有密切成因联系的惰性气体也说明了这一点。外地核中的U、Th存在周期性的核裂变可能是地质历史中超静磁带形成的主要原因,也可能是地球上火山活动等地质作用存在节律性及地球膨胀的原因。  相似文献   

钻探技术的非传统业务方向及其发展现状   总被引：1，自引：1，他引：0  

赵鹏大  鄢泰宁 《地质与勘探》1999,35(2):49-51

阐述了钻探技术的非传统业务方向及非传统钻探技术的研究现状及应用前景,相信它将为我国国民经济的可持续发展发挥重要作用。  相似文献   

河流与含水层水力耦合模型及其应用   总被引：16，自引：0，他引：16  

蒋业放  张兴有 《地理学报》1999,54(6):526-533

本文在分析河水与地下水相互作用规律的基础上,提出了河流－含水层相互作用水力耦合模型的建模思路、数值解法及应用实例。河流模型采用忽略河槽调蓄作用的圣维南连续方程,含水层模型为潜水二维渗流方程,二者通过动态水量交换机制实现耦合,模型的水量交换机制可以分别模拟含水层顶托排泄、河流压力渗和淋滤渗漏等不同方式的水量转换过程。河水模型和地下不模型分别用欧拉法和三角网格差分法来求解。实际应用表明耦合模型能较准确  相似文献   

Ostracode stratigraphy and paleoecology from surficial sediments of Lake Tanganyika, Africa     

T.M. Wells  A.S. Cohen  L.E. Park  D.L. Dettman  B.A. McKee 《Journal of Paleolimnology》1999,22(3):259-276

We report here on the first detailed ostracode stratigraphic record to be obtained from late Holocene sediments of Lake Tanganyika. We analyzed four cores, three from the northern lake region and a fourth from a more southern lake locality, that collectively record ostracode assemblages under a variety of disturbance regimes. These cores provide a stratigraphic record of ostracode abundance and diversity, as well as depositional changes over time periods of decades to millennia. We have investigated the fossil ostracodes in these cores by looking at temporal changes of species diversity and population structure for the species present. All four cores provided distinct patterns of ostracode diversity and abundance. BUR-1, a northern lake core obtained close to the Ruisizi River delta, yielded a sparse ostracode record. Karonge #3, another northern core from a site that is closely adjacent to a river delta with high sediment loading, yielded almost no ostracodes. The third core 86-DG-14, taken from a somewhat less disturbed area of the lake, suggests that there have been recent changes in ostracode populations. Through most of the lower portion of this core, ostracode abundance is low and species richness is relatively constant. Above 7 cm there is a marked increase in ostracode abundance and a corresponding decrease in species richness, probably signaling the onset of a major community disturbance, perhaps due to human activities. The southernmost core, 86-DG-32, is from a site that is well removed from influent rivers. Ostracode abundance varies erratically throughout the core, whereas species richness is relatively constant and high throughout the core. The temporal variation evident in ostracode community makeup both within and between the studied cores may be a result of naturally patchy distributions among ostracodes, coupled with local extinctions and recolonizations, or it may reflect inadequate sampling of these high diversity assemblages. In either case, these cores illustrate the potential to obtain high resolution ostracode records from the rich, endemic fauna of Lake Tanganyika that can be used to address questions about the history of community structure and human impacts in this lake.  相似文献   

A Light Portable Steam-driven Ice Drill Suitable for Drilling Holes in Ice and Firn     

Erich Heucke 《Geografiska Annaler: Series A, Physical Geography》1999,81(4):603-609

The purpose of this contribution is to explain the characteristics of a newly developed ice drill which is particularly geared to the needs of glaciologists. It is primarily designed for drilling holes for ablation stakes and for measuring water levels or temperatures in firn areas. Its distinguishing features are its light weight, making it easy to carry even over long distances, and the variety of tasks to which it can be adjusted. Furthermore, it is easy to operate even by one person.
Water is heated in a boiler by two gas flames to produce steam, which flows through an insulated hose to a nozzle. When the valve is opened the issuing steam condenses, and the heat released in the process melts the ice. The heater is constructed in such a way that it can easily be adapted to any form of gas supply locally available. It can be used for drilling in ice as well as in firn. The maximum drilling depth is 13 m in ice and 30 m in firn; hole diameters range from 25 to 45 mm. Mean drilling time is 16 min for 6 m, 35 min for 12 m in ice. The total weight is somewhat less than 16 kg, including all parts needed for drilling holes of 10 m in depth as well as the gas supply for one day. In recent years, devices of this type have been used successfully by scientists in various glaciated regions.  相似文献