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大面积静压群桩对邻近场地挤土变形影响试验研究 被引量:15
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作者 李双龙 魏丽敏 +2 位作者 杜猛 廖鹏庆 何群 《中国铁道科学》 EI CAS CSCD 北大核心 2020年第3期31-40,共10页
依托鲁南高铁曲阜东站并轨段路基工程,开展预应力管桩群桩成桩现场试验,研究大面积静压群桩对邻近场地挤土变形影响。结果表明:大面积静压群桩过程中,土体横向水平位移与地表隆起位移随成桩排数的增多而逐渐增大;位移发展经历快速、慢... 依托鲁南高铁曲阜东站并轨段路基工程,开展预应力管桩群桩成桩现场试验,研究大面积静压群桩对邻近场地挤土变形影响。结果表明:大面积静压群桩过程中,土体横向水平位移与地表隆起位移随成桩排数的增多而逐渐增大;位移发展经历快速、慢速及逐步稳定3个阶段;横向水平位移沿深度总体上呈减小趋势,其分布与土层性质有关;地表隆起位移随距试桩区水平距离的增大呈指数型衰减;该试验条件下,先成桩的微型桩对后压入的管桩挤土效应具有隔离作用,引孔深度15和20 m对横向水平位移及地表隆起位移的防控效果显著;压桩完成时,地表横向、竖向位移的影响范围分别约为88倍和30倍桩径;单排压桩新增位移量随压桩排数的增加呈先增后减趋势,表明前排压桩引发的挤土变形影响比后排压桩更大。 展开更多
关键词 铁路路基 邻近场地 静压群桩 挤土效应
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Some Results of Paleozoic Paleomagnetic Research
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作者 Minasyan Juliete 《Journal of Earth Science and Engineering》 2014年第11期703-708,共6页
This application note discusses the preliminary results of paleomagnetics studies of several incisions of the Paleozoic period the territory of Armenia and neighboring regions (Minor Caucasus). It is supposed that b... This application note discusses the preliminary results of paleomagnetics studies of several incisions of the Paleozoic period the territory of Armenia and neighboring regions (Minor Caucasus). It is supposed that before the Permian period the Armenian-lranian Mezocontinent was uniform with Afro-Arabia and only at the end of the late Paleozoic the formed Mesozoic ocean separated these areas from each other. A result of application of the complex laboratory investigations were identified from samples of primary magnetization the direction of which corresponds to the time of formation of the studied rocks. On the basis of paleomagnetic researches of Triassic, Permian, Devonian, Carbonian rocks a preliminary conclusion has been made about the dipole configuration of the geomagnetic field throughout Paleozoic. The comparison of the obtained data to paleomagnetic definitions of African, Arabian plates, Europe and the Siberian platform leads to the conclusion that the Minor Caucasus existed separately from the present general lithosphere blocks of Greater Caucasus and Europe. 展开更多
关键词 PALEOMAGNETIC magnetic field PALEOZOIC Afro-Arabian plates.
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Identification of Cholera Source in Mariupol City
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作者 Valeriia Shavkun Alexey Kapustin 《Journal of Environmental Science and Engineering(A)》 2012年第11期1288-1291,共4页
The cases of cholera in Mariupol and adjacent areas which were observed within the period of May-August, 2011 are investigated. Thirty-two diseased and 22 vibriocarriers were found on the territory of the city in the ... The cases of cholera in Mariupol and adjacent areas which were observed within the period of May-August, 2011 are investigated. Thirty-two diseased and 22 vibriocarriers were found on the territory of the city in the course of epidemic. The potential sources of infection are specified. The ways to avoid similar situations in the future are suggested. The analysis of the locations of the cholera contamination sources results in the obvious conclusion that most of them are connected with the place where the river Kalmius meets the Azov Sea. Waste flow from the residential solid waste landfill brings a considerable harm to the river Kalmius and the Azov Sea. 展开更多
关键词 CHOLERA EPIDEMIC residential solid waste landfill Azov Sea.
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Analysis of Space-time Characteristics of Energy Field of Seismicity in Jiangsu and Its Neighboring Areas
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作者 Wang Jun Sun Yejun Zhan Xiaoyan Zheng Jiangrong Jiang Haolin Huo Zhuqing 《Earthquake Research in China》 2010年第4期445-455,共11页
The paper analyzes the variation characteristics of energy fields of seismicity 2.1≤M L ≤4.5 in Jiangsu and its neighboring areas during the period between January 1970 and December 2007.It also analyzes the variati... The paper analyzes the variation characteristics of energy fields of seismicity 2.1≤M L ≤4.5 in Jiangsu and its neighboring areas during the period between January 1970 and December 2007.It also analyzes the variations of time "weight" coefficients of the major typical energy fields,using random function theory with seismic energy fields as a space-time random function field based on Empirical Orthogonal Function (EOF) expansion methods.The results show that the expansion accuracy of the first seven typical fields is 0.9244.The strength of seismic energy varies remarkably in different tectonic blocks in the study area.High value areas are in middle and southern Jiangsu,and the south Yellow Sea.The distribution of the typical fields also shows that it is an area that affects most significantly the seismic energy fields of the study region.The time "weight" coefficients of the first six typical fields vary with time,and the amplitude of the variations has strong temporal correlations with moderate-strong earthquakes in the region. 展开更多
关键词 Jiangsu and earthquakes its neighboring areas Energy Empirical Orthogonal Function field of moderate and small Space-time characteristics
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