大口径工程施工用滚刀钻头的研究

在大口径基岩和水井工程施工中,回转钻进破岩目前被国内外认为是一种快速、有效、经济的工艺方法.而回转钻进中常用的刀具主要是各种形式的滚刀钻头.破岩滚刀从结构形式上大致分为镶齿、楔齿和盘型滚刀.镶齿滚刀主要用于硬岩钻进,因价格昂贵难以用于基桩工程和水井施工.在楔齿滚刀中,传统的楔齿主要采用喷涂、电焊GW合金、激光熔敷等方法进行强化刀齿表面处理,效果不甚理想.而盘型滚刀只是将刀齿作圆周状分布,其刀齿材料和处理方式同楔齿和镶齿大致相同,主要用于反井钻进和巷道掘进,价格较高.针对这种情况,我们于1989年开始立项研究CG经济型滚刀及滚刀钻头.CG型滚刀的最大特点就是采用高强度、高硬度、高耐磨性的钢结硬质合金作为刀齿,合金密封,大大提高了滚刀钻头的可靠性和使用寿命,降低了产品成本.该型滚刀钻头在基岩中钻进最高寿命达140 m,在中硬地层中钻速最高可达0.5 m/h,在硬地层中钻进最高钻速达到0.3 m/h,充分显示了其在基岩钻进中的优势.这种经济型滚刀于1993年通过了部级鉴定.1995年获<国家级新产品证书>,并被定为河北省科技开发项目.1996年该型滚刀又获原地质矿产部科技成果三等奖.     

平底改锥体滚刀钻头及应用效果

以滚刀钻头破岩理论及常规锥底翼状钻头破岩理论为指导，分析提出了平底滚刀钻头在易斜地层钻进偏斜度大的机理，并设计了改进锥底滚刀钻头的关键结构及主要参数，改平底滚刀钻头为锥底滚刀钻头并进行了施工应用，取得了非常理想的工程效果。     

CG型液刀钻头及使用效果

介绍了滚刀钻头破岩机理，滚刀的分布规律，以及钻进参数等因素对钻进效果的影响，并通过施工实例对目前滚刀钻头使用中所存在的主要问题进行了分析。     

CG型滚刀钻头的钻进机理及使用效果分析

本文介绍了滚刀钻头破岩机理、滚刀的分布规律，以及钻进参数等因素对钻进效果的影响，并通过施工实例对目前滚刀钻头使用中所存在的主要问题进行了分析。     

镶齿滚刀及滚刀钻头嵌岩技术的研究

根据大口径嵌岩桩施工的需要，研制了镶齿滚刀及滚刀钻头，介绍了镶齿滚刀硬质合金齿的选择、布置，镶齿及密封技术，滚刀钻头的结构设计及钻进参数的确定。经生产性试验取得了良好的效果。     

CG经济型滚刀钻头的研究及应用

介绍了滚刀钻头的特点、破岩机理、分布规律以及钻进参数等因素对钻进效果的影响,并通过施工实例对目前滚刀钻头使用中所存在的主要问题进行了分析     

滚刀钻头在温州世贸中心大厦桩基工程中的应用

介绍了滚刀钻头在温州世贸中心大厦桩基工程中的应用情况，阐述了镶齿、焊齿两种滚刀钻头适应的地层和各自耐磨情况，并对各自的优缺点进行了分析、对比。     

襄樊汉江四桥大口径灌注桩成孔施工实践

介绍了使用泥浆护壁气举反循环回转钻进工艺进行襄樊汉江四桥大口径嵌岩桩的施工实践。施工中采用下置双护简隔离卵石层，合理选用钻头类型(卵砾石层采用五翼合金刮刀钻头，基岩采用球齿滚刀钻头)和钻进参数(混合器沉没深度，尾管长度，孔内空气流量与压力)，摸索与总结出一套复杂地层成孔施工经验。     

电焊硬质合金刀齿破岩滚刀：当前最耐磨的新材质滚刀

竖井钻机目前已广泛用于大口径工程井及煤田竖井施工。其破岩滚刀的寿命直接影响施工效率和成本．因此，国内外都对提高被岩滚刀刀齿耐磨性作了大员研究工作。我们经过十余年的试验研究，研制出一种耐磨性极好的电焊硬质合金刀齿破岩滚刀，在破中硬以下砂岩的工况下，其使用寿命比进口破岩滚刀高三倍。     

电焊硬质合金刀齿破岩滚刀—当前最耐磨的新材质滚刀

竖井钻机目前已广泛用于大口径工程井及煤田竖井施工，其破岩滚刀的寿命直接影响施工效率和成本，因此，国内外都对提高破岩滚刀刀盼耐磨性作了大量的研究工作，我们经过十 余年的试验研究，研制出一种耐磨性极好的电焊硬质合金刀齿破岩滚刀，在破中破以下砂央的工况下，其使用寿命比进口的破岩滚刀高三倍。     

Définition d'une limite multicritère ; stratigraphie du passage Campanien–Maastrichtien du site géologique de Tercis (Landes,SW France)Definition of a multi-criteria boundary; stratigraphy of the Campanian–Maastrichtian interval of the geological site at Tercis (Landes,SW France)

Lithostratigraphy, physicochemical stratigraphy, biostratigraphy, and geochronology of the 77–70 Ma old series bracketing the Campanian–Maastrichtian boundary have been investigated by 70 experts. For the first time, direct relationships between macro- and microfossils have been established, as well as direct and indirect relationships between chemo-physical and biostratigraphical tools. A combination of criteria for selecting the boundary level, duration estimates, uncertainties on durations and on the location of biohorizons have been considered; new chronostratigraphic units are proposed. The geological site at Tercis is accepted by the Commission on Stratigraphy as the international reference for the stratigraphy of the studied interval. To cite this article: G.S. Odin, C. R. Geoscience 334 (2002) 409–414.     

Late Wuchiapingian (Late Dzhulfian,early Late Permian) limestone olistolites within the Tertiary flysch of Glypia Unit (Mount Parnon,central–eastern Peloponnesus,Greece)

Some olistolites reworked in a Tertiary flysch of Mount Parnon (Peloponnesus, Greece) exhibit a Late Permian assemblage, dominated by Paradunbarula (Shindella) shindensis, Hemigordiopsis cf. luquensis and Colaniella aff. minima. This association corresponds to the Late Wuchiapingian (=Late Dzhulfian), a substage whose algae and foraminifera are generally little known. Contemporaneous limestones crop out in the middle part of the Episkopi Formation in Hydra, but they are rather commonly reworked in Mesozoic and Cainozoic sequences. The palaeobiogeographical affinities shared by the foraminiferal markers of Greece, southeastern Pamir, and southern China, are very strong (up to the specific level), and are congruent with the Pangea B reconstructions. To cite this article: E. Skourtsos et al., C. R. Geoscience 334 (2002) 925–931.     

PALEONTOLOGY

正20141596 Liu Yunhuan(School of Earth Sciences and Resources,Chang’an University,Xi’an 710054,China);Shao Tiequan Early Cambrian Quadrapyrgites Fossils of Xixiang Boita in Southern Shaanxi Province(Journal of Earth Sciences and Environment,ISSN1672-6561,CN61-1423/P,35(3),2013,p.39-43,3 illus.,20 refs.)     

GEOCHEMICAL EXPLORATION

正20141719 Chen Zhijun(State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Wuhan 430074,China);Chen Jianguo Automated Batch Mapping Solution for Serial Maps:A Case Study of Exploration Geochemistry Maps(Journal of Geology,ISSN1674-3636,CN32-1796/P,37(3),2013,p.456-464,2 illus.,2 tables,10 refs.)     

MICROPALAEONTOLOGY

正20140962 Chen Fenning(Xi’an Institute of Geology and Mineral Resources,Xi’an710054,China);Chen Ruiming Late Miocene-Early Pleistocene Ostracoda Fauna of Gyirong Basin,Southern Tibet(Acta Geologica Sinica,ISSN0001-5717,CN11-1951/P,87(6),2013,p.872-886,6illus.,56refs.)     

PETROLOGY

正1.IGNEOUS PETROLOGY20142008Cai Jinhui(Wuhan Center,China Geological Survey,Wuhan 430205,China);Liu Wei Zircon U-Pb Geochronology and Mineralization Significance of Granodiorites from Fuzichong Pb-Zn Deposit,Guangxi,South China(Geology and Mineral Resources of South China,ISSN1007-3701,CN42-1417/P,29(4),2013,p.271-281,7illus.,     

ENVIRONMENTAL GEOLOGY

正20141205Cheng Weiming(State Key Laboratory of Resources and Environmental Information System,Institute of Geographic Sciences and Natural Resources Research,CAS,Beijing 100101,China);Xia Yao Regional Hazard Assessment of Disaster Environment for Debris Flows:Taking Jundu Mountain,Beijing as an     

PROSPECTING EXPLORATION

正20141266Fan Chaoyan(Guangdong Provincial Key Laboratory of Mineral Resources and Geological Processes,Guangzhou 510275,China);Wang Zhenghai On Error Analysis and Correction Method of Measured Strata Section with Wire Projection Method(Journal of     

OCEANOGRAPHY & MARINE GEOLOGY

正20140582 Fang Xisheng(Key Lab.of Marine Sedimentology and Environmental Geology,First Institute of Oceanography,State Oceanic Administration,Qingdao 266061,China);Shi Xuefa Mineralogy of Surface Sediment in the Eastern Area off the Ryukyu Islands and Its Geological Significance(Marine Geology Quaternary Geology,ISSN0256-1492,CN37     

ENVIRONMENTAL GEOLOGY

正20141810 Bian Yumei(Geological Environmental Monitoring Center of Liaoning Province,Shenyang 110032,China);Zhang Jing Zoning Haicheng,Liaoning Province,by GeoHazard Risk and Geo-Hazard Assessment(Journal of Geological Hazards and Environment Preservation,ISSN1006-4362,CN51-1467/P,24(3),2013,p.5-9,2 illus.,tables,refs.)