共查询到20条相似文献，搜索用时 468 毫秒
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通过辽西某厂泥石流灾害的实地调查,阐述了泥石流发生的条件,介绍了泥石流危害,分析了泥石流的现状并预测了发展趋势,提出了防治措施。 相似文献
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过去15年(2005—2020年),我国浅层地热能产业发展迅猛.在理论和技术等方面取得了重大突破,主要成就包括:创立了浅层地热能地质学理论体系,开展了一系列关键技术及浅层地热能成因机理的研究,创新了浅层地热能规模化开发理念,建成了一批具有重大影响的示范项目,创建了浅层地热能研究和创新体系,推广工作取得了显著成效,促进了... 相似文献
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简要回顾了水文测验发展的过程,介绍了中国测验工作的现状,总结了近二十余年水文测验业务建设的重大举措,评价了水文测验技术应用成果,指出了当前中国水文测验存在的主要问题和面临的挑战,提出了今后水文测验工作发展的具体建议。 相似文献
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概括了网格定义并介绍了网格计算发展中的关键技术问题,分析了网格协议Globus体系结构,对最新发展的开放网格服务架构OGSA作了介绍,并对其在地球信息科学中的应用进行了展望. 相似文献
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如果你控制了石油,你就控制了所有国家;如果你控制了粮食,你就控制了所有的人;如果你控制了货币,你就控制了整个世界。——亨利·基辛格 相似文献
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塔里木盆地地质环境演化及钾矿寻找研究进展 总被引：4，自引：0，他引：4
描述了我国钾盐资源的现状,总结了世界上大型钾盐矿床的分布和形成规律:物质基础、地质构造、岩相古地理及气候条件.分析了塔里木盆地的基本概况,阐述了在晚自垩-古近纪这一历史上重要的成盐期,塔里木盆地的地质环境演化历史,分析了塔里木盆地晚白垩纪和古近纪沉积相特点,确定了塔里木盆地的两个浓缩中心--库车凹陷和塔西南凹陷,综述了塔里木盆地的地质找钾状况,为钾盐的找矿工作做了良好的地质铺垫. 相似文献
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基于三维有限元的地下连续墙深基坑逆作法施工方案设计 总被引：4，自引：0，他引：4
基于三维有限元,对采用"逆作法"施工的地下连续墙深基坑进行了设计方案研究,按变形控制提出了设计方法,并以天津某基坑为例进行了计算.首先,对结构进行了竖向荷载作用下的结构设计计算,然后,在结构计算的基础上提出了3种基坑施工方案,分别建立了三维有限元模型.对各方案的不同工况进行计算模拟,获得了各方案在不同工况下的连续墙和楼板的应力应变结果,找出了施工的控制工况和受力的薄弱部位.最后,结合实际情况分析了各方案的优点和不足之处,对方案进行了优选,可为最终设计方案的确定提供参考. 相似文献
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对大桥桥体漏水原因及危害进行了分析，提出了多种治理方案，并进行了方案优选，简介了优选方案的施工效果。 相似文献
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Emily Keeble David I. Whiteside Michael J. Benton 《Proceedings of the Geologists' Association. Geologists' Association》2018,129(2):99-119
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. 相似文献
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The effect of water on accessory phase solubility in subaluminous and peralkaline granitic melts 总被引：4，自引：0，他引：4
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. 相似文献
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Muriel Rocher Stéphane Baize Stéphane Jaillet Edward Marc Cushing Yannick Lozac&#x;h Francis Lemeille 《Comptes Rendus Geoscience》2003,335(8):701-708
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). 相似文献
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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 相似文献
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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), 相似文献
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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- 相似文献
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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- 相似文献
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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.) 相似文献
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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 相似文献