深厚漂卵石地层中超大直径钻井冲抓工艺的研究及应用

介绍了在直径8.3 m、深度285 m钻井井筒内,应用冲抓锥抓取漂卵石进尺并与回转钻进工艺相结合,完成超大直径钻井的工艺技术。主要包括冲抓设备参数的选取、冲抓工艺及技术参数的确定等。     

冲抓锥在砂层基础桩中的应用

我队承担一组高压电网铁塔基础桩的施工任务,桩径1米,桩深10.5米;下入钢筋笼长10米,笼φ840毫米,地处江边纯砂质地层,交通不便,采用了冲抓锥冲抓成孔,汽车吊下笼,灌注混凝土成柱。在施工过程中,始终掌握二条原则:一是保证泥浆粘度和孔内注满泥浆,以实现平衡压力;二是冲抓锥的平稳操作,以免碰刮孔壁。从而保证了工程的顺利实施。给我们提供了成功的经验。冲抓锥用来施工第四纪大口径水井和基桩孔,或作为基岩端承桩前期工程配套工艺,由于其可拆性强。工程简单,对交通条件不好,施工场地狭窄都能适应,是值得重视的一项钻探工艺。     

单绳冲抓锥自动脱挂装置的设计

介绍了单绳冲抓锥自动脱挂装置的结构和操作原理，通过对脱挂过程进行了的平衡分析，找出了影响脱钩灵活性和挂钩可靠性的主要因素，阐明了自动脱挂装置的设计原理。     

曝气污水处理井成井工艺

介绍了采用综合成井工艺完成曝气污水处理井的器具及方法。覆盖层用冲抓一沉井，以反力架使井筒下沉。基岩中采用钻、扩，结合锅锥取碴。     

CGJ1500新型全套管设备研制和试验成功

国土资源部勘探技术研究所最新研制的两台套“CGJ1500全套管冲抓成孔设备”(包括全套管钻机、液压泵站、套管和冲抓斗等)于2004年10月26日至11月3日在杭州进行了实钻生产试验，试验获得圆满成功。     

滇西北地区第三纪的逆冲－推覆构造

滇西北地区始新－渐新世的逆冲断裂系走向南北，向西倾，向东变晚，受新特提斯闭合和碰憧控制；中新世晚期－上新世早期的逆冲断裂系走向东西，朝北倾，与青藏高原的隆升有关，见于高原边缘。它们构成前导叠瓦扇，局部有反冲现象，以推覆距离小、影响深度浅为特征，控制了磨拉石盆地、浅成斑岩和膏盐底辟体的发育，在其西和其北分别发育与之对称的逆冲断裂系，构成科伯构造。     

藏南浪卡子地区新生代构造特征及构造演化

随着雅鲁藏布江缝合带的碰撞闭合，青藏高原进入了超碰撞阶段，伴随着西瓦里克A型俯冲带的形成和发展，导致藏南地壳的大幅度增厚和整个青藏高原的强烈隆升，而增厚隆升的主要方式就是由北向南的逆冲推覆和随之相伴生的伸展剥离，逆冲推覆造就了全球最壮观的山链，而伸展剥离则形成了青藏高原特殊的盆－岭相间的地貌景观，藏南浪卡子地区在新生代超碰撞阶段形成了多层次，多期次，多式样的逆冲推覆构造和伸展剥离构造。     

影响冲抓成孔灌注桩质量的因素

从成孔工艺原理、技术、装备、砼拌制及灌注技术管理等方面分析了影响冲抓成孔灌注桩质量的因素，并提出了改进措施。     

高含沙水流特性和滩槽冲淤特征浅述

综述高含沙水流特性和滩槽冲淤特征的国内外相关研究进展,国内相关学者在产、汇流特性、流变特性、流动特性、输沙特性等方面做了大量的研究工作,国外目前关于高含沙水流的研究遵循与借鉴了我国的方法和理论。对滩槽冲淤特征的研究大多集中在黄河、渭河流域,成果集中在对河道冲淤规律的探讨和冲淤机理、冲淤特性、输沙用水量等的研究,对泾、渭河高含沙洪水的异常现象如洪水位抬高、贴边淤积等的研究相对较少,需进一步研究探索。     

中国北方中生代逆冲推覆构造研究进展

推覆构造是陆内构造变形中地壳缩短的重要方式之一, 是记录盆山结合带-造山带形成演化过程的重要载体。中国北方位于中亚造山带南部及周缘地区, 分布了多个逆冲推覆构造带。本文通过对这些推覆构造相关的几何学、运动学和年代学等资料的综合收集分析, 梳理了中国北方众多中生代逆冲推覆构造的时空展布特征、形成时代及形成机制等。在空间展布上, 这些推覆构造沿中国北方近东西向展布, 推覆距离几十~几百公里不等, 属于浅层次脆性变形。在形成时代上, 这些推覆构造的时代可以和燕山运动主挤压变形期相对应, 分为早(170~160 Ma)和晚(150~135 Ma)两期。在动力学机制上, 本文将推覆体可分为东西两段, 西段主体的逆冲方向为北东—南西向, 可能受控于鄂霍次克洋闭合和班公湖—怒江缝合带闭合的综合影响; 东段主体逆冲方向为北西—南东向, 可能主要受控于鄂霍茨克洋的闭合与古太平洋板块俯冲的远程应力影响。     

The terrestrial fauna of the Late Triassic Pant-y-ffynnon Quarry fissures,South Wales,UK and a new species of Clevosaurus (Lepidosauria: Rhynchocephalia)

Pant-y-ffynnon Quarry in South Wales yielded a rich cache of fossils in the early 1950s, including articulated specimens of new species (the small sauropodomorph dinosaur Pantydraco caducus and the crocodylomorph Terrestrisuchus gracilis), but no substantial study of the wider fauna of the Pant-y-ffynnon fissure systems has been published. Here, our overview of existing specimens, a few described but mostly undescribed, as well as freshly processed material, provides a comprehensive picture of the Pant-y-ffynnon palaeo-island of the Late Triassic. This was an island with a relatively impoverished fauna dominated by small clevosaurs (rhynchocephalians), including a new species, Clevosaurus cambrica, described here from a partially articulated specimen and isolated bones. The new species has a dental morphology that is intermediate between the Late Triassic Clevosaurus hudsoni, from Cromhall Quarry to the east, and the younger C. convallis from Pant Quarry to the west, suggesting adaptive radiation of clevosaurs in the palaeo-archipelago. The larger reptiles on the palaeo-island do not exceed 1.5?m in length, including a small carnivorous crocodylomorph, Terrestrisuchus, and a possible example of insular dwarfism in the basal dinosaur Pantydraco.     

The effect of water on accessory phase solubility in subaluminous and peralkaline granitic melts

The solubilities of columbite, tantalite, wolframite, rutile, zircon and hafnon were determined as a function of the water contents in peralkaline and subaluminous granite melts. All experiments were conducted at 1035 °C and 2 kbar and the water contents of the melts ranged from nominally dry to approximately 6 wt.% H₂O. Accessory phase solubilities are not affected by the water content of the peralkaline melt. By contrast, solubilities are affected by the water content of the subaluminous melt, where the solubilities of all the accessory phases examined increase with the water content of the melt, up to 2 wt.% H₂O. At higher water contents, solubilities are nearly constant. It can be concluded that water is not an important control of accessory phase solubility, although the water content will affect diffusivities of components in the melt, thus whether or not accessory phases will be present as restite material. The solubility behaviour in the subaluminous and peralkaline melts supports previous spectroscopic studies, which have observed differences in the coordination of high field strength elements in dry vs. wet subaluminous granitic glasses, but not for peralkaline granitic glasses. Lastly, the fact that wolframite solubility increases with increasing water content in the subaluminous melt suggests that tungsten dissolved as a hexavalent species.     

Quaternary stresses revealed by calcite twinning inversion: insights from observations in the Savonnières underground quarry (eastern France)

Calcite samples were extracted both from the rock matrix and the superficial coating of a karstified fault plane of an underground quarry, located in the eastern border of the Paris basin. The karstification is dated as Quaternary. Analysis of mechanical calcite twinning reveals that only the calcite matrix has also undergone a compression trending WNW that can be attributed to the Mio-Pliocene alpine collision. Both coating and matrix have undergone a strike-slip regime with σ₁ roughly trending north–south, that could correspond to the regional present-day state of stress, a strike-slip compression rather trending NNW, modified by local phenomena. To cite this article: M. Rocher et al., C. R. Geoscience 335 (2003).     

HYDROGEOLOGY

正20141756 Chen Ruige(Mathematical College,China University of Geosciences,Beijing100083,China);Zhou Xun Numerical Simulation of Groundwater Level Fluctuation in a Coastal Confined Aquifer with Sloping Initial Groundwater Level Induced by the Tide(Geological Bulletin of China,ISSN1671-2552,CN11-4648/P,32(7),2013,p.1099-1104,6 illus.,16 refs.) Key words:confined water,groundwater level     

METAMORPHIC PETROLOGY

正20141408 Cai Jia(Institute of Geology,Chinese Academy of Geological Sciences,Beijing100037,China);Liu Fulai Petrogenesis and Metamorphic P-T Conditions of Garnet-Spinel-Biotitebearing Paragneiss in Danangou Area,Daqingshan-Wulashan Metamorphic Complex Belt(Acta Petrologica Sinica,ISSN1000-0569,CN11-1922/P,29(7),     

SERIALS

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GEOPHYSICAL EXPLORATION

正20142386An Guoying(China Aero Geophysical Survey and Remote Sensing Center for Land and Resources,Beijing 100083,China)Application of Satellite Remote Sensing in Regional Hydrogeological Investigation:Taking Cenozoic Strata in Wenquan Sheet(1∶250 000)of Karakoram Range as an Example(Geosci-     

QUATERNARY GEOLOGY & GEOMORPHOLOGY

正20141016An Chengbang(Key Laboratory of Western China’s Environmental Systems,Ministry of Education,Lanzhou University,Lanzhou 730000,China);Zhao Yongtao Lake Records during the Last Glacial Maximum from Xinjiang,NW China and Their Climatic Impli-     

PETROLEUM GEOLOGY

正20141538 Cao Qing(School of Earth Sciences and Engineering,Xi’an Petroleum University,Xi’an 710065,China);Zhao Jingzhou Characteristics and Significance of Fluid Inclusions from Majiagou Formation,Yichuan Huangling Area,Ordos Basin(Advances in Earth Science,ISSN1001-8166,CN62-1091/P,28(7),2013,p.819-828,7 illus.,3 tables,43 refs.)     

GEOCHEMISTRY

正20142002 Wei Hualing(Institute of Geophysical and Geochemical Exploration,Chinese Academy of Geological Sciences,Langfang065000,China);Zhou Guohua Element Content and Mineral Compositions in Different Sizes of Soil in Tongling Area,Anhui Province(Geological Bulletin of China,ISSN1671-2552,CN11-4648/P,32(11),2013,p.1861