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金水桥石拱结构的抗震分析 被引量:3
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作者 杜义欣 刘晶波 +1 位作者 聂建国 樊健生 《建筑结构》 CSCD 北大核心 2005年第8期43-45,51,共4页
金水桥是具有重要历史意义的石拱桥,利用ANSYS有限元软件,选取混凝土单元Solid65,按照现行规范,进行了抗震分析。结果表明金水桥在8度地震作用下不会发生破坏,在遭遇9度地震作用时会发生局部破坏,特别是拱圈1/4和拱顶处,建议对拱圈石块... 金水桥是具有重要历史意义的石拱桥,利用ANSYS有限元软件,选取混凝土单元Solid65,按照现行规范,进行了抗震分析。结果表明金水桥在8度地震作用下不会发生破坏,在遭遇9度地震作用时会发生局部破坏,特别是拱圈1/4和拱顶处,建议对拱圈石块的缝隙进行局部的抗震加固。 展开更多
关键词 金水桥 石拱结构 抗震设计 拱圈石块 加固措施 地震作用
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Arch structure effect of the coal gangue flow of the fully mechanized caving in special thick coal seam and its impact on the loss of top coal 被引量:9
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作者 Zhang Ningbo Liu Changyou 《International Journal of Mining Science and Technology》 SCIE EI CSCD 2016年第4期593-599,共7页
Based on the characteristics of the top coal thickness of the fully mechanized caving in special thick coal seam,the long distance of coal gangue caving,as well as the different sizes of the coal gangue broken fragmen... Based on the characteristics of the top coal thickness of the fully mechanized caving in special thick coal seam,the long distance of coal gangue caving,as well as the different sizes of the coal gangue broken fragment dimension and spatial variation of drop flow,this paper uses laboratory dispersion simulation experiment and theoretical analysis to study the arch structure effect and its influence rule on the top coal loss in the process of coal gangue flow.Research shows that in the process of coal gangue flow,arch structure can be formed in three types:the lower arch structure,middle arch structure,and upper arch structure.Moreover,the arch structure has the characteristics of dynamic random arch,the formation probability of dynamic random arch with different layers is not the same,dynamic random arch caused the reduction of the top coal fluency;analyzing the dynamic random arch formation mechanism,influencing factors,and the conditions of instability;the formation probability of the lower arch structure is the highest,the whole coal arch and the coal gangue arch structure has the greatest impact on top coal loss.Therefore,to prevent or reduce the formation of lower whole coal arch structure,the lower coal gangue arch structure and the middle whole coal arch structure is the key to reduce the top coal loss.The research conclusion provides theoretical basis for the further improvement of the top coal recovery rate of the fully mechanized caving in extra thick coal seam. 展开更多
关键词 Extra thick coal seam Coalgangue flow Top coalloss Dynamic random arch effect
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