重复荷载作用下加筋格宾挡土墙动力特性
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摘要
设计并完成了大型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),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,加筋格宾挡墙在重复荷载作用200万次下,挡墙内外部未出现明显的局部和整体破坏,其结构具有良好的稳定性和抗破坏性。当振动频率达到10 Hz时,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。试验结果有助于揭示挡墙在重复荷载作用下的失稳机制。
A large-scale model test of reinforced gabion walls was designed and performed.The model wall filled with red sandstone for construction was built with a length of 3.0 m,height of 2.0 m,and width of 0.85 m.PVC-coated heavy galvanized 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 frequencies and amplitudes.The dynamic characteristics and dynamic responses of model wall under cyclic loading were discussed.The results show that(1) the inside and outside of reinforced gabion wall under two million times repeated loads does not appear significant local and overall damage,the structure is stable and anti-destructive;(2)when the vibration frequency reaches 10 Hz,there are great changes of vertical and horizontal acceleration and displacement response of the reinforced gabion wall.The results are helpful to reveal the mechanism of reinforced gabion wall's instability under cyclic loading.
A large-scale model test of reinforced gabion walls was designed and performed.The model wall filled with red sandstone for construction was built with a length of 3.0 m,height of 2.0 m,and width of 0.85 m.PVC-coated heavy galvanized 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 frequencies and amplitudes.The dynamic characteristics and dynamic responses of model wall under cyclic loading were discussed.The results show that(1) the inside and outside of reinforced gabion wall under two million times repeated loads does not appear significant local and overall damage,the structure is stable and anti-destructive;(2)when the vibration frequency reaches 10 Hz,there are great changes of vertical and horizontal acceleration and displacement response of the reinforced gabion wall.The results are helpful to reveal the mechanism of reinforced gabion wall's instability under cyclic loading.
引文
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[2]MOHAMAD H M,RICHARD D W.Dynamic Responseof Sand Reinforced with Randomly Distributed Fibers[J].Journal of Geotechnical Engineering,1990,116(7):1116-1131.
[3]杨果林,肖宏彬.现代加筋土挡土结构[M].北京:煤炭工业出版社,2002.YANG Guolin,XIAO Hongbin.Modern Reinforced EarthRetaining Structure[M].Beijing:Coal IndustryPress,2002.
[4]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 Guolin,XIAO Hongbin,WANG Yonghe.Experiment Dynamic Behaviour and Analysis of FatigueDamnify of Reinforced Earth Wall[J].Journal ofVibration Engineering,2002,15(2):173-177.
[5]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 Guolin,LI Haishen,WANG Yonghe.Model Teston Reinforced Earth Retaining Wall under RepeatedLoading[J].China Civil Engineering Journal,2003,36(6):105-110.
[6]杨果林,王永和.加筋土挡墙在重复荷载作用下的模型试验与动态响应分析[J].岩石力学与工程学报,2002,21(10):1541-1546.YANG Guolin,WANG Yonghe.Model Testing andDynamic Respond Analysis on Reinforced Earth Wall underRepeated Load[J].Chinese Journal of Rock Mechanicsand Engineering,2002,21(10):1541-1546.
[7]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 Haishen,YANG Guolin,ZOU Yinsheng.Analysis ofDynamic Character of Reinforced Earth Retaining Wall[J].China Journal of Highway and Transport,2004,17(2):28-32
[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 Xinwen,CAI Ying.A Model Test Study of theDynamic Performances of Subgrades[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].石家庄铁道学院院报,2004,17(2):19-22.LIU Yaojun,GUO Zengqiang,ZHAO Yucheng.Researchon Dynamic Characteristics of Qinshen High-speedRailway Roadbed with Different Filling Materials[J].Journal 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 Junming,LIU Songyu,SHI Minglei,et al.Experimental Study on Dynamic Response of LowEmbankment under Traffic Load[J].Journal of SoutheastUniversity: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 Youpa,GAO Yongtao,FANG Zulie,et al.Instability Analysis of Retaining Walls under RandomVehicle Loading Condition[J].Journal of University ofScience 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 Wenhua,HONG Baoning,XU Yi.Time FrequencyCharacteristic 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 Xiangqiu,YANG Linde,GAO Wenhua.WaveletAnalysis for Measuring Signals of the Dynamic SoilPressure in the Road Foundation of High Speed Railway[J].Earthquake Engineering and Engineering Vibration,2004,24(4):38-42.
[14]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 Huoyan,ZHOU Yitang,ZHONG Guoqiang.Study on Seismic Dynamic Properties of the Retaining WallReinforced Soil[J].Journal of Highway andTransportation Research and Development,2004,21(9):16-20.
[15]李昀,杨果林,林宇亮.加筋格宾挡墙地震反应与动土压力分析[J].四川大学学报:工程科学版,2009,41(4):63-69.LI Yun,YANG Guolin,LINYuliang.Analysis on SeismicResponse and Dynamic Earth Pressure of ReinforcedGabion Wall[J].Journal of Sichuan University:Engineering Science Edition,2009,41(4):63-69.
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