水平地震作用下绿色加筋格宾挡土墙动力特性试验研究
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摘要
设计并完成了1:2.5比例尺的绿色加筋格宾挡土墙大型模型试验。试验模型长×宽×高为3.00m×0.85m×2.00m,坡角为70°,填料采用工程现场所用的红砂岩材料制备。双绞合六边形金属格宾网由聚氯乙烯(PVC)包裹,并镀锌防腐,网面单元长×宽为80mm×100mm。通过输入不同类型和幅值的地震波激励,探讨地震作用下模型挡墙的动力特性与动力响应规律。试验结果表明:绿色加筋格宾挡土墙对输入加速度有明显的放大效应;沿墙高方向,水平加速度放大倍数的增量比较平缓,随着墙高的增大,水平加速度有增大趋势;在不同类型地震波作用下,加速度响应有明显差异;墙面板的水平加速度放大倍数随振幅增大呈现明显的递减趋势,基本上呈线性变化;竖向加速度峰值响应在墙面及墙顶显著增大,可达到台面水平加速度峰值的50%左右。
A large-scale model test of green reinforced gabion walls with the scale of 1:2.5 was introduced. The model wall filled with red sandstone was built with length of 3.00 m, height of 2.00 m, width of 0.85 m, and a slope angle of 70°. PVC-coated heavy galvanization of double twisted hexagonal wire mesh was used in the test, and the wire mesh specimens were 80 mm×100 mm. A series of tests were performed with different input seismic wave kinds and amplitudes. The dynamic characteristics and dynamic responses of model wall under horizontal seismic loading were discussed. The results show that there is a significant amplification effect of input acceleration in green reinforced gabion walls. The increment slope of horizontal acceleration magnification times are flatter with the wall height. With the increase of high wall, there is an augmentation trend to horizontal acceleration. Acceleration response has significant difference under the function of different types of seismic waves. The magnification times of lateral acceleration tend are less obvious with the increase of amplitude, and the whole change shows a mainly linear stage. Vertical acceleration peaks both in the wall face and at the top of the wall increase greatly, reaching about 50% of lateral acceleration peak of table.
A large-scale model test of green reinforced gabion walls with the scale of 1:2.5 was introduced. The model wall filled with red sandstone was built with length of 3.00 m, height of 2.00 m, width of 0.85 m, and a slope angle of 70°. PVC-coated heavy galvanization of double twisted hexagonal wire mesh was used in the test, and the wire mesh specimens were 80 mm×100 mm. A series of tests were performed with different input seismic wave kinds and amplitudes. The dynamic characteristics and dynamic responses of model wall under horizontal seismic loading were discussed. The results show that there is a significant amplification effect of input acceleration in green reinforced gabion walls. The increment slope of horizontal acceleration magnification times are flatter with the wall height. With the increase of high wall, there is an augmentation trend to horizontal acceleration. Acceleration response has significant difference under the function of different types of seismic waves. The magnification times of lateral acceleration tend are less obvious with the increase of amplitude, and the whole change shows a mainly linear stage. Vertical acceleration peaks both in the wall face and at the top of the wall increase greatly, reaching about 50% of lateral acceleration peak of table.
引文
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[15]GB50011—2001,建筑抗震设计规范[S].GB50011—2001,Code for seismic design of buildings[S].
[2]甘亚南,李庆华,王冬梅.双面加筋挡土墙结构在高烈度地震区应用的研究[J].焦作工学院学报:自然科学版,2004,23(4):310-314.GAN Ya-nan,LI Qing-hua,WANG Dong-mei.Application of double-sided ribbed earthen screen wall in earthquake zone of high earthquake intensity[J].Journal of Jiaozuo Institute of Technology:Natural Science,2004,23(4):310-314.
[3]程火焰,周亦唐,钟国强.加筋土挡土墙地震动力特性研究[J].公路交通科技,2004,21(9):16-20.CHENG Huo-yan,ZHOU Yi-tang,ZHONG Guo-qiang.Study on seismic dynamic properties of the retaining wall reinforced soil[J].Journal of Highway and Transportation Research and Development,2004,21(9):16-20.
[4]刘华北.水平与竖向地震作用下土工格栅加筋土挡墙动力分析[J].岩土工程学报,2006,28(5):594-599.LIU Hua-bei.Analysis on seismic behavior of geogrid-reinforced retaining wall subjected to horizontal and vertical excitations[J].Chinese Journal of Geotechnical Engineering,2006,28(5):594-599.
[5]Ling H I,Liu H,Mohri Y.Parametric studies on the behavior of reinforced soil retaining walls under earthquake loading[J].Journal of Engineering Mechanics,ASCE,2005,131(10):1056-1065.
[6]Ling H I,Mohri Y,Leshchinsky D.Large-scale shaking table tests on modular-block reinforced-soil retaining walls[J].Journal of Geotechnical and Geoenvironmental Engineering,ASCE,2005,131(4):465-476.
[7]GB50290—98,土工合成材料应用技术规范[S].GB50290—98,Technical standard for applications of geosynthetics[S].
[8]杨果林,李海深,王永和.加筋土挡墙动力特性模型试验与动力分析[J].土木工程学报,2003,36(6):105-110.YANG Guo-lin,LI Hai-shen,WANG Yong-he.Model test on reinforced earth retaining wall under cyclic loading[J].China Civil Engineering Journal,2003,36(6):105-110.
[9]李海深,杨果林,邹银生.加筋土挡土墙动力特性分析[J].中国公路学报,2004,17(2):28-32.LI Hai-shen,YANG Guo-lin,ZOU Yin-sheng.Analysis of dynamic character of reinforced earth retaining wall[J].China Journal of Highway and Transport,2004,17(2):28-32.
[10]刘尧军,郭增强,赵玉成.秦沈客运专线不同填料路基动力特性的试验研究[J].石家庄铁道学院院报,2004,17(2):19-22.LIU Yao-jun,GUO Zeng-qiang,ZHAO Yu-cheng.Research on dynamic characteristics of Qinshen high-speed railway roadbed with different filling materials[J].Journal of Shijiazhuang Railway Institute,2004,17(2):19-22.
[11]杨有海.地震作用下加筋土挡墙稳定性分析[J].兰州铁道学院学报:自然科学版,2002,21(4):9-11.YANG You-hai.Stability analysis on the reinforced earth retaining wall under earthquake loadings[J].Journal of Lanzhou Railway University:Natural Sciences,2002,21(4):9-11.
[12]刘华北.地震作用下模块式面板土工合成材料加筋土挡墙的内部稳定分析[J].岩土工程学报,2008,30(2):278-283.LIU Hua-bei.Internal stability analysis of segmental geosynthetic-reinforced soil retaining walls subjected to seismic loading[J].Chinese Journal of Geotechnical Engineering,2008,30(2):278-283.
[13]Liu H,Ling H I.A unified elastoplastic-viscoplastic bounding surface model of geosynthetics and its applications to GRS-RW analysis[J].Journal of Engineering Mechanics,ASCE,2007,133(7):801-815.
[14]Ling H I,LIU Hua-bei,Kaliakin V N.Analyzing dynamic behavior of geosynthetic-reinforced soil retaining walls[J].Journal of Engineering Mechanics,ASCE,2004,130(8):911-920.
[15]GB50011—2001,建筑抗震设计规范[S].GB50011—2001,Code for seismic design of buildings[S].
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