预应力锚索桩板墙动态响应规律研究
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摘要
随着公路交通流量增加及超载车辆增多,交通荷载对支挡结构的受力变形特性影响越来越大。通过FLAC3D软件建立预应力锚索桩板墙空间分析模型,并与现场动应变测试结果进行比较,探讨了交通荷载作用下挡墙的受力变形机制。结果表明:交通荷载在路基与挡墙中所反映的影响深度大致都为2m左右,正常情况下(重型汽车满载、行驶在行车道上)作用在预应力锚索桩板墙上的动土压力大约为该处挡墙静止土压力的10%。
With the increase of traffic and the over-load vehicles, the bearing and deforming behavior of retaining structure is increasingly influenced by traffic loads. According to the prestressed anchor sheet-pile wall, using FLAC3D, the spatial analysis model is established. Combining with the field dynamic strain test, the mechanism of bearing and deforming behavior of retaining structure is studied. The results show that the depth of the traffic loads affected is about 2 meters in both subgrade and retaining wall. Under normal circumstances(fully loaded heavy vehicles, driving on a carriageway), the dynamic earth pressure of prestressed anchor sheet-pile wall is approximately 10% of earth pressure at rest.
With the increase of traffic and the over-load vehicles, the bearing and deforming behavior of retaining structure is increasingly influenced by traffic loads. According to the prestressed anchor sheet-pile wall, using FLAC3D, the spatial analysis model is established. Combining with the field dynamic strain test, the mechanism of bearing and deforming behavior of retaining structure is studied. The results show that the depth of the traffic loads affected is about 2 meters in both subgrade and retaining wall. Under normal circumstances(fully loaded heavy vehicles, driving on a carriageway), the dynamic earth pressure of prestressed anchor sheet-pile wall is approximately 10% of earth pressure at rest.
引文
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[2]何昌荣,陈群.新型预应力锚拉式桩板墙的三维有限元计算分析[J].岩石力学与工程学报,2003,22(5):843-848.HE Chang-rong,LI Tong,CHENG Qun,et al.3D FEM analysis on new-style prestressed anchor sheet-pile retaining wall[J].Chinese Journal of Rock Mechanics and Engineering,2003,22(5):843-848.
[3]邓学钧,孙璐.车辆-地面结构系统动力学[M].北京:人民交通出版社,2000.
[4]邓学钧,李昶.水平荷载作用下的路面结构应力[J].岩土工程学报,2002,24(4):427-431.DENG Xue-jun,LI Chang.The stress of road structure under horizontal load[J].Chinese Jorunal of Geotechnical Engingeering,2002,24(4):427-431.
[5]陶向华,黄晓明.车辆动载荷的频域模拟计算与分析[J].华中科技大学学报(城市科学版),2003,20(4):47-50.TAO Xiang-hua,HUANG Xiao-ming.Analysis and calculation of frequency domain simulations of dynamic load[J].Journal of Huazhong University of Science and Technology(Urban Science Edition),2003,20(4):47-50.
[6]沈聚敏,周锡元,高小旺,等.地震工程学[M].北京:中国建筑工业出版社,2000:232-241.
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