交通荷载对预应力锚索桩板墙的土压力影响分析
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摘要
以邵怀高速公路应用最典型的桩板式挡土墙为例,以数值方法为研究工具,考虑车辆与挡墙的距离、汽车载重和汽车速度等因素,区别挡墙的不同位置(桩、板),对挡墙的土压力进行现场测试与计算分析。研究结果表明:在交通荷载的作用下,挡土墙受影响的部位主要集中在墙顶以下2m,桩(柱)上所受的影响大于板上所受的影响;当动荷载离挡土墙的距离在0～1.5m内变化时,对挡土墙的影响较大,而当距离大于1.5m后,对挡土墙的影响就相当小;汽车的行车速度对挡墙结构的影响较小;汽车超载对挡墙的影响较大,设计时必须考虑这种因素对挡墙的影响。
Taking sheet-pile in ShuoHuai expressway as an typical example,using numerical method and considering the different distance between the vehicles and the retaining wall,the different vehicles' loads and velocities,the dynamic stress was studied according to the different positions of sheet-pile (pile and board). The results show that,under the traffic load,the main part of the retaining wall which is affected is less than 2 m of the top of the retaining wall. The dynamic effect of the pile is bigger than that of the board. When the dynamic load varies in 0-1.5 m,there is a bigger dynamic effect on the retaining structure,and the distance is greater than 1.5 m,the dynamic effect of the vehicles on the retaining wall is relatively small. The velocity of vehicles has a less effect on the retaining structure. The overload of the vehicles has a larger effect on the retaining structure,it must be considered.
Taking sheet-pile in ShuoHuai expressway as an typical example,using numerical method and considering the different distance between the vehicles and the retaining wall,the different vehicles' loads and velocities,the dynamic stress was studied according to the different positions of sheet-pile (pile and board). The results show that,under the traffic load,the main part of the retaining wall which is affected is less than 2 m of the top of the retaining wall. The dynamic effect of the pile is bigger than that of the board. When the dynamic load varies in 0-1.5 m,there is a bigger dynamic effect on the retaining structure,and the distance is greater than 1.5 m,the dynamic effect of the vehicles on the retaining wall is relatively small. The velocity of vehicles has a less effect on the retaining structure. The overload of the vehicles has a larger effect on the retaining structure,it must be considered.
引文
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[2]李献民,王永和,杨果林,等.高速下过渡段路基动响应特性研究[J].岩土工程学报,2004,26(1):100-104.LI Xian-min,WANG Yong-he,YANG Guo-lin,et al.Study on the dynamic response of transition section roadbed subject to high speed[J].Chinese Journal of Geotechnical Engineering,2004,26(1):100-104.
[3]董建华,朱彦鹏.地震作用下土钉支护高速公路边坡动力参数分析[J].西安建筑科技大学学报:自然科学版,2007,39(5):661-666.DONG Jian-hua,ZHU Yan-peng.Parametric analysis on seismic behavior of highway slope protected by soil nailing retaining wall under earthquake[J].J Xi’an Univ of Arch&Tech:Natural Science Edition,2007,39(5):661-666.
[4]程火焰,周亦唐,钟国强.加筋土挡土墙地振动力特性研究[J].公路交通科技,2004,21(9):16-20.CHENG Huo-yan,ZHOU Yi-tang,ZHONG Guo-qiang.Study on the seismic properties of the reinforced soil retaining wall[J].Journal of Highway and Transportation Research and Development,2004,21(9):16-20.
[5]Kim S R,Kwon O S,Kim M M.Evaluation of force components acting on gravity type quay walls during earthquakes[J].Soil Dynamics and Earthquake Engineering,2004,24(11):853-866.
[6]Fang Y S,Yang Y C,Chen T J.Retaining walls damaged in the Chi-Chi earthquake[J].Canadian Geotechnical J,2003,40:1142-1153.
[7]张友葩.动载下坡间挡土墙失稳机理及加固技术应用研究[D].北京:北京科技大学土木与环境工程学院,2003:11-12.ZHANG You-ba.Study and engineering application of supporting technology applied on retaining wall laid on unstable slope[D].Beijing:Beijing University of Science and Technology.School of Civil and Environment Engineering,2003:11-12.
[8]仇敏玉,俞亚南.车辆荷载下地基数值模型的边界影响分析[J].公路交通科技,2010,27(1):39-42.QIU Min-yu,YU Ya-nan.Effect of artificial boundary on numerical model of foundation under vehicle loads[J].Journal of Highway and Transportation Research and Development,2010,27(1):39-42.
[9]聂志红.高速铁路轨道路基竖向动力响应研究[D].长沙:中南大学土木建筑学院,2005:65-66.NIE Zhi-hong.Study on vertical dynamic response of the track subgrade in high-speed railway[D].Changsha:Central South University.School of Civil and Architectural Engineering,2005:65-66.
[10]邓学钧.车辆一地面结构系统动力学研究[J].东南大学学报:自然科学版,2002,32(3):474-479.DENG Xue-jun.Study on dynamics of vehicle-ground pavement structure system[J].Journal of Southeast University:Natural Science Edition,2002,32(3):474-479.
[11]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 Journal of Geotechnical Engineering,2002,24(4):427-431.
[12]左迎辉,蔡袁强,徐长节,等.移动荷载下饱和半空间的动力响应[J].岩石力学与工程学报,2005,24(23):4352-4357.ZUO Ying-hui,CAI Yuan-qiang,XU Chang-jie,et al.Dynamic response of soil in saturated half space under moving load[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(23):4352-4357.
[13]侯芸,孙四平,郭忠印,等.移动荷载下刚性路面响应的参数影响分析[J].同济大学学报,2003,31(1):31-35.HOU Yun,SUN Si-ping,GUO Zhong-yin,et al.Dynamic response sensitivity analysis of plate on elastic foundation subjected to moving point loads[J].Journal of Tongji University,2003,31(1):31-35.
[14]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.
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