重复荷载作用下绿色加筋格宾挡土墙的动力特性
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摘要
设计并完成了大型绿色加筋格宾挡墙模型试验。试验模型尺寸为3.0 m×0.85 m×2.0 m(长×宽×高),坡角为70°,填料采用工程现场用红砂岩材料制备。双绞合六边形金属格宾网由PVC包裹,并镀锌防腐,网面单元尺寸为80 mm×100 mm。通过输入不同幅值和频率的正弦波激励,探讨重复荷载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:绿色加筋格宾结构具有良好的稳定性和抗破坏性,其结构寿命能满足使用要求。当振动频率达到8 Hz时,绿色加筋格宾挡墙的竖向、水平加速度和竖向、水平位移反应变化极大。加速度反应、动位移反应和动应力反应沿墙深度方向都以一定的速度衰减。试验结果有助于揭示挡墙在重复荷载作用下的失稳机制,为绿色加筋格宾挡土墙工程设计提供有益的参考。
A large-scale model test of green reinforced gabion walls was introduced.The model wall filled with red sandstone was built with a length of 3.0 m,height of 2.0 m,width of 0.85 m and a slope angle of 70°.PVC-coated heavy galvanized of double twisted hexagonal wire mesh was used in the test,and the wire mesh specimens were 80 mm×100 mm cell sizes.A series of tests were performed with different input sine wave frequency and amplitudes.The dynamic characteristics and dynamic responses of model wall under cyclic loading were discussed.Results show that green reinforced gabion structure has a good stability and anti-destructive and its structure life meets the use requirements.When the vibration frequency reaches 8 Hz,there are greatly changes of vertical & horizontal acceleration and displacement response of the green reinforced gabion wall.There is a certain degree of speed decline to acceleration response,dynamic displacement response and dynamic stress response of wall depth directions.The results are helpful to reveal the mechanism of reinforced gabion walls instability under cyclic loading,and provide valuable references of green reinforced gabion walls engineering design.
A large-scale model test of green reinforced gabion walls was introduced.The model wall filled with red sandstone was built with a length of 3.0 m,height of 2.0 m,width of 0.85 m and a slope angle of 70°.PVC-coated heavy galvanized of double twisted hexagonal wire mesh was used in the test,and the wire mesh specimens were 80 mm×100 mm cell sizes.A series of tests were performed with different input sine wave frequency and amplitudes.The dynamic characteristics and dynamic responses of model wall under cyclic loading were discussed.Results show that green reinforced gabion structure has a good stability and anti-destructive and its structure life meets the use requirements.When the vibration frequency reaches 8 Hz,there are greatly changes of vertical & horizontal acceleration and displacement response of the green reinforced gabion wall.There is a certain degree of speed decline to acceleration response,dynamic displacement response and dynamic stress response of wall depth directions.The results are helpful to reveal the mechanism of reinforced gabion walls instability under cyclic loading,and provide valuable references of green reinforced gabion walls engineering design.
引文
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[13]王祥秋,杨林德,高文华.高速铁路路基动土压力测试信号的小波分析[J].地震工程与工程振动,2004,24(4):38-42.WANG Xiang-qiu,YANG Lin-de,GAO Wen-hua.Wavelet analysis for measuring signals of the dynamicsoil pressure in the road foundation of high speed railway[J].Earthquake Engineering and Engineering Vibra-tion,2004,24(4):38-42.
[14]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,ZOUYin-sheng.Analysisof dynamic character of reinforced earth retaining wall[J].China Journal of Highway and Transport,2004,17(2):28-32.
[15]LI Yun,YANG Guo-lin,LIN Yu-liang,et al.Fa-tigue model testing and life analysis of reinforced gabionwalls under cyclic loading[C]//Progress in safety sci-ence and technology VII.Beijing:Science Press,2008:1830-1833.
[16]李昀,杨果林,林宇亮.土工格栅加筋土挡墙地震响应分析[J].铁道科学与工程学报,2009,6(3):22-27.LI Yun,YANG Guo-lin,LIN Yu-liang.Analysis onseismic behavior of geogrid-reinforced retaining wallsubjected to seismic loading[J].Journal of Railway Sci-ence and Engineering,2009,6(3):22-27.
[2]Richardson J B,Finn D L.Dynamic response analysis ofreinforced-soil retaining wall[J].Journal of GeotechnicalEngineering,1992,118(8):1158-1167.
[3]Futakim,Ogawan Satom,Kumda T,Natsume S.Experi-ments about seismic performance of reinforced earth retai-ning wall[C]//Proceedings of Eleventh World Confer-ence on Earthquake Engineering,Elsevier Science,1996.
[4]梁波.加筋粉煤灰的静动强度指标试验研究[J].实验力学,1998,13(1):85-91.LIANG Bo.Study on static and dynamic strength index ofreinforced fly ash[J].Journal of Experimental Mechan-ics,1998,13(1):85-91.
[5]杨果林,肖宏彬,王永和.加筋土挡墙动变形特性试验与疲劳损伤分析[J].振动工程学报,2002,15(2):173-177.YANG Guo-lin,XIAO Hong-bin,WANG Yong-he.Ex-periment dynamic behaviour and analysis of fatigue damni-fy of reinforced earth wall[J].Journal of Vibration Engi-neering,2002,15(2):173-177.
[6]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.Modeltest on reinforced earth retaining wall under repeated load-ing[J].China Civil Engineering Journal,2003,36(6):105-110.
[7]邵生俊,邓国华,吕立强.直壁加筋高路堤振动台模型试验研究[C]//中国土木工程学会第九届土力学及岩土工程学术会议论文集,2003,10:933-938.SHAO Sheng-jun,DENG Guo-hua,LV Li-qiang.Straight-walled reinforced high embankment shaking table modeltest[C]//Proceedings of Ninth China Civil EngineeringSociety of Soil Mechanics and Geotechnical EngineeringSymposium,2003,10:933-938.
[8]曹新文,蔡英.铁路路基动态特性的模型试验研究[J].西南交通大学学报,1996,31(1):36-41.CAO Xin-wen,CAI Ying.Model test study of dynamicperformances of railway embankment[J].Journal ofSouthwest Jiaotong University,1996,31(1):36-41.
[9]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].石家庄铁道学院学报,2004,17(2):19-22.LIU Yao-jun,GUO Zeng-qiang,ZHAO Yu-cheng.Re-search on dynamic characteristics of Qinshen high-speedrailway roadbed with different filling materials[J].Jour-nal of Shijiazhuang Railway Institue,2004,17(2):19-22.
[10]赵俊明,刘松玉,石名磊,等.交通荷载作用下低路堤动力特性试验研究[J].东南大学学报:自然科学版,2007,37(5):921-926.ZHAO Jun-ming,LIUSong-yu,SHI Ming-lei,et al.Ex-perimental study on dynamic response of low embank-ment under traffic load[J].Journal of Southeast Univer-sity:Natural Science Edition,2007,37(5):921-926.
[11]张友葩,高永涛,方祖烈,等.交通载荷下挡土墙的失稳分析[J].北京科技大学学报,2003,25(1):19-24.ZHANG You-pa,GAO Yong-tao,FANG Zu-lie,et al.Instability analysis of retaining walls under random vehi-cle loading condition[J].Journal of University of Sci-ence and Technology Beijing,2003,25(1):19-24.
[12]查文华,洪宝宁,徐毅.交通荷载下路面振动响应信号的时频特征分析[J].工程抗震与加固改造,2007,29(4):105-110.ZHA Wen-hua,HONG Bao-ning,XUYi.Time frequen-cy characteristic analysis of pavement vibration responsesignals under traffic loadings[J].Earthquake ResistantEngineering and Retrofitting,2007,29(4):105-110.
[13]王祥秋,杨林德,高文华.高速铁路路基动土压力测试信号的小波分析[J].地震工程与工程振动,2004,24(4):38-42.WANG Xiang-qiu,YANG Lin-de,GAO Wen-hua.Wavelet analysis for measuring signals of the dynamicsoil pressure in the road foundation of high speed railway[J].Earthquake Engineering and Engineering Vibra-tion,2004,24(4):38-42.
[14]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,ZOUYin-sheng.Analysisof dynamic character of reinforced earth retaining wall[J].China Journal of Highway and Transport,2004,17(2):28-32.
[15]LI Yun,YANG Guo-lin,LIN Yu-liang,et al.Fa-tigue model testing and life analysis of reinforced gabionwalls under cyclic loading[C]//Progress in safety sci-ence and technology VII.Beijing:Science Press,2008:1830-1833.
[16]李昀,杨果林,林宇亮.土工格栅加筋土挡墙地震响应分析[J].铁道科学与工程学报,2009,6(3):22-27.LI Yun,YANG Guo-lin,LIN Yu-liang.Analysis onseismic behavior of geogrid-reinforced retaining wallsubjected to seismic loading[J].Journal of Railway Sci-ence and Engineering,2009,6(3):22-27.
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