移动式防洪墙防洪系统渗漏特性及力学性能试验研究
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摘要
移动式防洪墙是一个安全高效的城市防洪系统,目前已在欧洲广泛应用,但在国内对移动式防洪墙构件的力学性能和渗漏特性研究甚少。依托国内某市实际工程,规划移动式防洪墙试验基地,设计与实际工程同等条件下的移动式防洪墙结构参数。通过防洪墙整体蓄水试验、ANSYS仿真分析,研究了防洪墙渗漏特征、挡板力学性能。研究结果表明:移动式防洪系统在水头超过0. 80 m后发生渗漏,超过1. 70 m后渗漏加速,渗漏部位发生在底部挡板;挡板与立柱连接处及同一挡板高度下的防洪挡板应变随水头的增加越来越大,其中挡板高度为40 cm的应变最大,最大应变为4 595με;固定水头1. 60 m下,仿真计算值略小于试验数据,初步分析由墙身渗漏、预埋件安装精度不高等因素导致。研究成果可为移动式防洪墙的国产化应用提供理论支撑。
Mobile floodwall is a safe and efficient urban flood control system,which has been widely used in Europe at present.However,little research has been done on the mechanical properties and leakage characteristics of the mobile flood-wall components in China. Therefore,relying on the actual project a certain city in China,planning the mobile flood-wall test base and designing the structural parameters of the mobile flood wall under the same conditions of the actual project,the whole flood test of the flood-wall and ANSYS simulation analysis are conducted to study the characteristics of the flood-wall leakage and baffle mechanical properties. The results show that the mobile flood control system seepage occurs when the water head exceeds 0. 80 m,and the leakage accelerates when the water head exceeds 1. 70 m. The leakage site occurs at the bottom baffle. The strains of the connection between the baffle,the column and the flood barrier at the same baffle height increase with the increase of the water head. The maximum strain is 4 595 με and occurs at the height of the baffle-plate of 40 cm. The calculated value is slightly less than the experimental data at the fixed head of 1. 60 m,which is verified to be caused by the leakage of the wall body and the poor accuracy of the installation of the pre-embedded parts through an initial analysis. The research result provide theoretical support for the localization of the mobile flood-wall.
Mobile floodwall is a safe and efficient urban flood control system,which has been widely used in Europe at present.However,little research has been done on the mechanical properties and leakage characteristics of the mobile flood-wall components in China. Therefore,relying on the actual project a certain city in China,planning the mobile flood-wall test base and designing the structural parameters of the mobile flood wall under the same conditions of the actual project,the whole flood test of the flood-wall and ANSYS simulation analysis are conducted to study the characteristics of the flood-wall leakage and baffle mechanical properties. The results show that the mobile flood control system seepage occurs when the water head exceeds 0. 80 m,and the leakage accelerates when the water head exceeds 1. 70 m. The leakage site occurs at the bottom baffle. The strains of the connection between the baffle,the column and the flood barrier at the same baffle height increase with the increase of the water head. The maximum strain is 4 595 με and occurs at the height of the baffle-plate of 40 cm. The calculated value is slightly less than the experimental data at the fixed head of 1. 60 m,which is verified to be caused by the leakage of the wall body and the poor accuracy of the installation of the pre-embedded parts through an initial analysis. The research result provide theoretical support for the localization of the mobile flood-wall.
引文
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[2]任双立,吕勋博.北京城市副中心防洪对策研究[J].水利水电技术,2017,48(10):56-62.
[3]张文渊.对城市防洪中几个问题的认识[J].城市道桥与防洪,2000(2):30-32.
[4]刘兴昌,黄广文.城市防洪及其规划问题的思考[J].水土保持通报,2002,22(4):57-61.
[5]刘树坤.国外防洪减灾发展趋势分析[J].水利规划与设计,2000,20(1):2-9.
[6]杨钧,李琳.从“德国神器”到“中国神器”[J].视听纵横,2016(5):106.
[7]徐朝辉.移动式防洪墙:中国,CN 103306237. A[P]. 2013.
[8]李志鹏,岳金文,洪顺军.快速组装移动式防洪墙:中国,CN104499460. A[P]. 2015.
[8]刘加海.装配式钢闸板组合防洪墙研究[D].成都:四川大学,2005.
[9]吴军君,倪立建,陈海云,等.移动式防洪墙挡水试验研究[J].水电能源科学,2017,35(3):85-88.
[10]陈守开,李慧敏,王远明,等.移动式防洪系统力学性能及渗漏特性试验研究[J].农业工程学报,2017,33(20):83-89.
[11]王新敏. ANSYS工程结构数值分析[M].北京:人民交通出版社,2007.
[12] MAZZOLAN F M,Piluso V. Prediction of the rotation capacity of aluminium alloy beams[J]. Thin-walled structures,1997,27(1):103-116.
[13]王誉瑾,范峰,钱宏亮,等. 6082-T6高强铝合金材料本构模型试验研究[J].建筑结构学报,2013,34(6):113-120.
[14] MOEN L A,MATTEIS G D. Rotational capacity of aluminum beams under moment gradient. II:numerical simulations[J]. Journal of structural engineering,1999,125(8):921-929.
[15]中国建筑股份有限公司.建筑工程施工过程结构分析与监测技术规范:JGJ/T 302—2013[S].北京:中国建筑工业出版社,2013.