共查询到20条相似文献，搜索用时 109 毫秒
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上海市地下水超采现状及防范措施 总被引：1，自引：0，他引：1
本文通过对上海市各承压含水层采灌现状的分析,进行了地下水可开采量的预测。针对上海市因过量抽取地下水,造成大范围的地下水水位降落漏斗,并导致地面沉降等环境地质问题,提出了做好人工回灌、调减限制地下水开采量等防治措施。 相似文献
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天津市地下水开采对地面沉降影响的多元回归分析 总被引：1，自引：0，他引：1
地下水的过量开采是天津市引起地面沉降的主要原因。因此天津市提出了“压缩地下水开采量”、“地下水人工回灌”、“调整地下水开采层次”等控制地面沉降的3大技术措施。经过多年的努力,控制地面沉降效果明显。如何解决地下水开发与控制地面沉降的关系,更好的贯彻这3大技术措施,是该文编写的初衷。即在开采同样地下水量的情况下,如何使地面沉降量最小;或在地面沉降量容许的情况下,如何开采最大量的地下水。压缩地下水开采量是治理地面沉降的根本措施,亦即如何压缩采水量或调整开采层次会达到最好效果。论文对天津市某区各个地下水开采层的多年累计开采量、累计沉降量进行数据统计分析,建立了该地区累计沉降量及各个地下水开采层的多元相关方程。在此基础上,分析了各个地下水开采层对地面沉降影响的相关程度。以此为该区控制地面沉降的提供依据。 相似文献
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控制上海地面沉降措施是压缩地下水开采量、人工回灌及调整地下水开采层次等综合作用的结果。人工回灌对地下水水质仅有点状污染,而对区域地下水水质基本无影响。 相似文献
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浅层地下水人工回灌应用于上海市工程性地面沉降防治的试验研究 总被引：1，自引：0，他引：1
上海地面沉降主要由过量开采地下水资源和大规模工程建设等因素共同影响,工程性地面沉降引起的地面沉降漏斗严重影响了周边地区生命线工程的建设及运营安全。通过开展试验研究,将深部承压含水层中应用成熟的地下水人工回灌技术引入浅部含水层中,但由于浅部含水层砂层结构及水动力条件与深部含水层差异较大,回灌工艺及方法也存在差异。本次试验工作中,改进了地下水人工回灌工艺流程,并通过同步地面形变监测分析了浅层地下水人工回灌对控制地面沉降的作用效果。结合上海地区实际地层特征以及各种回灌工艺的实际效果,评价了浅层地下水人工回灌技术在防治工程型地面沉降中推广应用的可行性及适用性。 相似文献
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梁靖 《中国地质灾害与防治学报》2007,18(1):64-67
广东省地下水开发利用程度虽低,但不同地区地下水的开采极不均衡。一些主要开采区,因过量开采地下水出现了诸如区域地下水位大幅度下降、地裂缝、房屋开裂、地面塌陷、地面沉降及海水入侵等一系列环境地质问题。据其严重性分为I级、Ⅱ级和Ⅲ级共3个等级(区)。针对这些环境地质问题,提出了诸如加强监督管理,严格控制地下水开采量,优化地下水开采布局;实施人工回灌,增加地下水补给;健全地下水动态监测网,建立地下水资源管理模型,加强水情监测和预报等防治措施。 相似文献
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《上海国土资源》2021,(2)
上海自1921年发现地面沉降,至今已经100年历史。上海采取压缩地下水开采和进行地下水人工回灌等措施,使地面沉降得到有效控制。尤其21世纪上海市进入微量沉降阶段。地面沉降速度显著减小,地面沉降防治进入分区管控的新阶段。本文从上海市防治分区角度出发,对2001～2017年间上海地面沉降变化特征及其与地下水采灌关系进行分析研究。结果表明上海地面沉降量总体呈减小趋势,地面沉降防治效果显著。地面沉降量变化趋势与深部土体变形量变化趋势大抵相同,2001～2008年间各防治区地面沉降量大幅减小,2009～2017年间减小速率较平缓。2001～2008年间,重点防治区地面沉降量相比次重点及一般防治区年均沉降量差值约10mm,2009～2017年间差值减至约3mm,重点防治区地面沉降防治效果相对更明显。重点防治区在2001～2017年间地面沉降虽然减缓但持续发展,而次重点和一般防治区则在2009年后由地面沉降转变为地面回弹。各防治区深部土体在2009年左右开始回弹,浅部土体年压缩量变化不大且几乎不回弹或微量回弹。2001～2017年间上海各防治区地面沉降量及深部土体变形量变化趋势与净抽水量变化整体响应良好,压缩开采、增大回灌能有效防治地面沉降灾害。2009年后深部含水层开始回弹,之后随着净抽水量继续减小回弹变化缓慢;除一般防治区外其它防治区回弹量在3mm内轻微波动。人工回灌对于增大深部土体回弹的效果不明显。 相似文献
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一、控制上海市地面沉降研究工作现状及存在问题上海市“控沉”研究工作经过十多年各方面协同努力,使市区地面沉降得到了基本控制。但是以往工作中过于强调了“过量”抽汲地下水是造成市区地面沉降的主要因素。并把人工回灌作为“控沉”的唯一手段。 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