SYZX75绳索取心液动锤在破碎地层中的应用   总被引：4，自引：0，他引：4  

周宗奇  熊家勤  余慎军 《中国煤炭地质》2011,(1):64-65

SYZX75绳索取心液动锤钻具由双喷嘴复合式液动潜孔锤与绳索取心钻具结合而成。为解决绳索取心在极破碎岩层钻进中的岩心堵塞,从而造成频繁打捞问题,湖北煤炭地质局在宜昌董家堡磷矿勘探区进行了SYZX75绳索取心液动锤钻进的试验应用。为了使试验数据具有对比性,采取了在一个孔内相近地层进行对比试验,从试验所得数据来看,绳索取心液动锤钻进工艺与普通绳索取心工艺相比,平均回次进尺提高了40.5%,平均每日进尺提高了48.1%。据此认为该项技术可在破碎岩层的勘探区中推广应用。  相似文献   

Surface and sub‐surface Schmidt hammer rebound value variation for a granite outcrop     

Barbora Černá  Zbyněk Engel 《地球表面变化过程与地形》2011,36(2):170-179

This study presents rock strength variations at granite outcrops and in subsurface vertical profiles in the Jizerské hory Mountains, Czech Republic. Schmidt hammer rebound values in subsurface profiles change gradually from the bedrock surface downward. An exponential relation has been observed between the R‐values and depth in rock outcrops to a depth of around 4·5 m. The exponential nature of the curve indicates that rock hardness increases more rapidly with depth in the uppermost 1?m section of the rock profile. A detailed study of rebound values obtained from both intact and polished rock exposures reveal effects of surface grinding on results of the Schmidt hammer method. The range of data collected increases after grinding, allowing more precise discrimination of rock surfaces in respect of age and weathering. The Schmidt hammer method may be used effectively as a relative‐age dating tool for rock surfaces that originated during the Late Pleistocene. It is concluded that this time limitation can be significantly mitigated by surface grinding before measurement. Copyright © 2010 John Wiley & Sons, Ltd.  相似文献   

小秦岭复杂地层潜孔锤反循环钻探技术试验研究   总被引：1，自引：0，他引：1       下载免费PDF全文

田敏  赵志强  曾石友  殷其雷  李金朋  杨宽才 《探矿工程》2013,40(11):1-4

贯通式潜孔锤反循环连续取心钻进技术具有效率高、钻孔质量好、钻探成本低等特点,尤其对复杂地层有较强的适应性。在反循环钻头及钻具进行优化组合的基础上,结合小秦岭金矿田程村矿区钻探项目开展野外生产试验。试验结果表明：潜孔锤反循环钻进系统对复杂地层条件适应性强,解决了该矿区的系列钻探技术难题。试验深化了对贯通式潜孔锤反循环钻探机理和反循环钻头结构的创新研究,对贯通式潜孔锤及配套钻具的进一步合理优化,实现高效率、低成本、短工期和良好的地质利用效果提供了技术支撑。  相似文献   

绳索取心液动锤在中国岩金勘查第一深钻的应用和最新进展          下载免费PDF全文

董海燕 《探矿工程》2013,40(10):9-12

在中国岩金勘查第一深钻ZK96—5钻孔的深部施工中,应用绳索取心液动锤技术在破碎复杂地层中钻进,增加回次进尺,提高时效,延长钻头寿命;在比较完整地层中提高钻速,减少辅助时间,体现了绳索取心液动锤技术的优越性,目前3911．34m的使用深度创造了绳索取心液动锤适应孔深的最新记录。对绳索取心液动锤在深部钻进的优势和易出现的问题进行了分析总结。  相似文献   

液动锤钻进减轻岩心堵塞机理的研究          下载免费PDF全文

赵远刚  张伟 《探矿工程》2013,40(7):81-83

通过对液动锤取心钻进过程中钻具的受力分析,论述了液动锤减轻岩心堵塞的作用机理,阐明了液动锤钻进技术的适用地层范围,介绍了其在汶川地震断裂带科学钻探工程WFSD-4号孔中应用取得的成果。  相似文献   

Schmidt hammer exposure‐age dating (SHD) of late Quaternary fluvial terraces in New Zealand     

Timothy Stahl  Stefan Winkler  Mark Quigley  Mark Bebbington  Brendan Duffy  Daniel Duke 《地球表面变化过程与地形》2013,38(15):1838-1850

Schmidt hammer (SH) R‐values are reported for surface clasts from numerically dated Holocene and Pleistocene fluvial terraces in the South Island of New Zealand. The R‐values are combined with previously obtained weathering rind, radiocarbon, terrestrial cosmogenic nuclide and luminescence terrace ages to derive SH R‐value chronofunctions for greywacke clasts from four distinct locations. Our results show that different weathering rates affect the form of the SH R‐value versus Age curve, however a fundamental dependency between the two remains constant over timescales ranging from 10² to 10⁵ years. Power law scaling constants suggest changes in clast weathering rates are primarily affected by climatic (precipitation and temperature) and sedimentologic variables (source terrane petrology). Age uncertainties of ~22% of the surface age suggest that Schmidt hammer exposure‐age dating (SHD) is a reliable calibrated‐age dating technique for fluvial terraces. Copyright © 2013 John Wiley & Sons, Ltd.  相似文献   

潜孔锤反循环钻进技术在某水电站的试验应用   总被引：1，自引：0，他引：1  

殷其雷  殷琨  柳鹤  甘心 《吉林大学学报(地球科学版)》2014,44(3):961

水利工程中的钻孔工程具有特殊的工况,采用正循环潜孔锤钻进方法在狭窄封闭的洞室内进行钻孔施工,粉尘污染严重,施工环境恶劣,影响作业工人的身体健康。为了解决施工洞室内的粉尘污染问题,在某水电站的排水孔施工中,首次应用了潜孔锤反循环钻进技术,并在上仰孔和下行孔施工试验中获得成功,有效控制和降低了洞室内的粉尘问题,有利于维护良好的施工环境。设计的A、B两种结构类型钻头主要差别是内喷孔的位置不同,A型钻头的内喷孔设计在花键上的各个平键之间,B型钻头的内喷孔则设计在花键的平键上。CFD数值模拟计算结果显示,A型钻头对环空抽吸的空气量是0.199 987 04 kg/s,略大于B型钻头的0.177 524 64 kg/s,说明A型钻头的抽吸能力优于B型钻头。上仰孔和下行孔的钻进试验结果表明,内喷孔设计在花键上的各个平键之间且具有双排12个内喷孔的A型钻头结构更为合理,在施工中A型钻头比B型钻头的孔口粉尘少。从反循环排渣效果看,A型钻头破碎的大部分岩粉和大颗粒岩块从中心通道排出,反循环排渣效果优于B型钻头。  相似文献   

Assessing the rock glacier kinematics on three different timescales: a case study from the southern Swiss Alps          下载免费PDF全文

Cristian Scapozza  Christophe Lambiel  Claudio Bozzini  Stefano Mari  Marco Conedera 《地球表面变化过程与地形》2014,39(15):2056-2069

Surface temperature increases since the 1990s have often been associated with an increase in the speed of rock glaciers. Evidence of similar links on the centennial to millennial scale are, however, still lacking due to less focus to date on the medium‐ and long‐term kinematics of these landforms. In order to assess (palaeo)climatic variations in rock glacier kinematics, we analysed the movements of the Stabbio di Largario rock glacier in the southern Swiss Alps using three different timescales. The Schmidt hammer exposure‐age dating (SHD) was applied to study long‐term kinematics in order to extrapolate the minimal age of the formation of the rock glacier, which may have started its development after the Mid‐Holocene climate optimum, and to detect possible accelerations of the horizontal surface velocity during the Medieval Warm Period. Georeferentiation and orthorectification of six historical photographs of the rock glacier taken between ad 1910 and today were analysed using monoplotting to detect the rock glacier displacement on the decennial scale from the end of the Little Ice Age. Finally, differential global positioning system (dGPS) monitoring data available since ad 2009 were used to assess annual and seasonal creep rates of the rock glacier at present. Our results show a link between the periods of increase in mean air temperature on different timescales and variations in rock glacier kinematics and provide important new insights into rock glacier development and evolution on the long‐term scale. Copyright © 2014 John Wiley & Sons, Ltd.  相似文献   

Comparison of electronic and mechanical Schmidt hammers in the context of exposure‐age dating: are Q‐ and R‐values interconvertible?          下载免费PDF全文

Stefan Winkler  John A. Matthews 《地球表面变化过程与地形》2014,39(8):1128-1136

Application of Schmidt‐hammer exposure‐age dating (SHD) to landforms has substantially increased in recent years. The original mechanical Schmidt hammer records R‐(rebound) values. Although the newly introduced electronic Schmidt hammer (SilverSchmidt) facilitates greatly improved data processing, it measures surface hardness differently, recording Q‐(velocity) values that are not a priori interconvertible with R‐values. This study is the first to compare the performance of both instruments in the context of field‐based exposure‐age dating with a particular focus on the interconvertibility of R‐values and Q‐values. The study was conducted on glacially polished pyroxene‐granulite gneiss, Jotunheimen, southern Norway. Results indicate that mean Q‐values are consistently 8–10 units higher than mean R‐values over the range of values normally encountered in the application of SHD to glacial and periglacial landforms. A convenient conversion factor of ±10 units may, therefore, be appropriate for all but the softest rock types close to the technical resolution of the instruments. The electronic Schmidt hammer should therefore be regarded as a useful complement and potential replacement for the mechanical Schmidt hammer. Conversion of published R‐values data to Q‐values requires, however, careful control and documentation of instrument calibration. Copyright © 2014 John Wiley & Sons, Ltd.  相似文献   

Geomorphology and glacial history of Rauer Group, East Antarctica     

Duanne A. White  Ole Bennike  Simon L. Harley  Kevin Kiernan  Bernd Wagner 《Quaternary Research》2009,72(1):80-90

The presence of glacial sediments across the Rauer Group indicates that the East Antarctic ice sheet formerly covered the entire archipelago and has since retreated at least 15 km from its maximum extent. The degree of weathering of these glacial sediments suggests that ice retreat from this maximum position occurred sometime during the latter half of the last glacial cycle. Following this phase of retreat, the ice sheet margin has not expanded more than ∼ 1 km seaward of its present position. This pattern of ice sheet change matches that recorded in Vestfold Hills, providing further evidence that the diminutive Marine Isotope Stage 2 ice sheet advance in the nearby Larsemann Hills may have been influenced by local factors rather than a regional ice-sheet response to climate and sea-level change.  相似文献