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基于农田电力灌溉站渠道防渗的施工技术分析研究
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作者 李丹 《水利科技与经济》 2024年第3期134-139,共6页
研究以滁州市南谯区施集镇泵站为研究对象,从防渗效果、材料稳定性和经济性等方面,分析农田电力灌溉站渠道防渗施工技术的应用效果。结果表明,在25MPa压力下,渠道土体的形变实测值小于2.0%,孔隙度小于20%,表明土壤的压缩性和抗剪强度较... 研究以滁州市南谯区施集镇泵站为研究对象,从防渗效果、材料稳定性和经济性等方面,分析农田电力灌溉站渠道防渗施工技术的应用效果。结果表明,在25MPa压力下,渠道土体的形变实测值小于2.0%,孔隙度小于20%,表明土壤的压缩性和抗剪强度较高,土壤的紧密程度较高,有利于提高渠道的防渗效果。此外,灌溉渠道施工实际成本低于计划成本,成本节约率约为57.4%,显示出较高的经济性。研究结果可为灌溉站渠道设计和施工提供有益的经验和参考。 展开更多
关键词 灌溉站 渠道防渗 施工方案 质量控制 BIM 土体形变 孔隙度
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我国采动地裂缝形成机理研究进展 被引量:45
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作者 陈超 胡振琪 《煤炭学报》 EI CAS CSCD 北大核心 2018年第3期810-823,共14页
煤矿区采动地裂缝可对岩土工程的稳定及土地生态安全造成严重威胁,研究其形成机理有助于实现矿区资源与环境协调开发。根据采动地裂缝的力学成因进行分类,系统梳理了不同类型采动地裂缝形成机理研究进展,分析了采动地裂缝的影响因素与... 煤矿区采动地裂缝可对岩土工程的稳定及土地生态安全造成严重威胁,研究其形成机理有助于实现矿区资源与环境协调开发。根据采动地裂缝的力学成因进行分类,系统梳理了不同类型采动地裂缝形成机理研究进展,分析了采动地裂缝的影响因素与研究方法,讨论了相关的关键科学问题。分析认为,岩层破断与表土层形变过程尤其是基岩与松散层接触面的应力-应变机制、动态地裂缝多周期形成机理、顾及多因素耦合影响效应的力学模型构建、多技术手段的综合运用、深部开采与生态脆弱矿区高强度开采以及煤炭开采新技术引起的地裂缝形成机理等将是未来研究的难点与发展趋势。 展开更多
关键词 采煤沉陷 地裂缝 形成机理 岩层破断 土体形变
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The Creeping Shores of the Golden Horn
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作者 Ergtin Togrol Yalgun Eyigtin Serkan Ktiman 《Journal of Civil Engineering and Architecture》 2012年第2期174-181,共8页
In a soft clay layer overlain by a thick man made ground layer, as in the case of the Unkapam shores of the Golden Horn, excess pore pressures have remained for long periods and the soft clay layer has hardly undergon... In a soft clay layer overlain by a thick man made ground layer, as in the case of the Unkapam shores of the Golden Horn, excess pore pressures have remained for long periods and the soft clay layer has hardly undergone few volumetric deformations. Along the shores of the Golden Horn such creep of the soil towards the sea has been detected at more than 40 mm in the last 26 months. The measurements of those movements are examined in this paper. Our research points out that the local failure of a soil element or of a particular layer differs from the general failure of the soil mass. Furthermore, the large masses of unfailed soil which overlie the soft layer along the shores of the Golden Horn delay the general failure of the slopes. We conclude that the shear strains producing excessive pore pressures is the cause of the creep observed. Because a proper solution still need to be found for a sustainable stability of the area, it is necessary to continue with the measurements of the Golden Horn's creeping shores. 展开更多
关键词 Pore pressure dissipation CREEP slope stability.
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Role of yttrium content in twinning behavior of extruded Mg−Y sheets under tension/compression
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作者 Yan-qin CHAI Dong-di YIN +4 位作者 Shen HUA Guang-hao HUANG Hao ZHOU Jiang ZHENG Qu-dong WANG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2022年第11期3534-3549,共16页
The influence of Y content on the grain-scale twinning behavior in extruded Mg−xY(x=0.5,1,5,wt.%)sheets under uniaxial tension and compression along the extruded direction was statistically investigated.An automatic t... The influence of Y content on the grain-scale twinning behavior in extruded Mg−xY(x=0.5,1,5,wt.%)sheets under uniaxial tension and compression along the extruded direction was statistically investigated.An automatic twin variant analysis was employed,based on large data sets obtained by electron backscatter diffraction(EBSD),including 2691 grains with 977 twins.The{1012}tension twinning(TTW)dominance and prevailing anomalous twinning behavior(Schmid factor(m)<0)under both tension and compression were found.The anomalous twinning behavior was more pronounced as Y content increased under tensile loading,indicating a promoted stochasticity of twin variant selection for more concentrated Mg−Y alloys.However,the trend for the Y-content dependent anomalous twinning behavior was opposite in compression.The fractions of the anomalous TTWs were found to be well correlated with the maximum Schmid factor(m_(max))values of basal slip and prismatic slip in the corresponding parent grains for compression and tension,respectively,indicating that twinning and dislocation slip might be closely related in the present Mg−Y alloys. 展开更多
关键词 Mg−RE alloys deformation twinning twin variant selection Schmid factor anomalous twin
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