预应力锚索桩板墙动力响应现场试验与数值分析
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摘要
基于邵怀高速公路某标段预应力锚索桩板墙及路基的动力响应现场试验,通过改变车辆荷载和行车速度,对路基和预应力锚索桩板墙下多个测点进行测试。根据现场试验结果,并借助有限元数值模拟,分析了路基和预应力锚索桩板墙动应变随行车荷载和行车速度的变化关系。研究结果表明:路基和预应力锚索桩板墙中动应变与车辆荷载关系密切,而与行车速度关系不明显,动应变随深度增加而表现出明显衰减的规律,交通荷载对路基与挡土墙的变形受力影响深度均为2.5 m左右。因此,在实际挡墙设计时,应该慎重考虑车辆荷载这一因素对预应锚索桩板墙稳定性的影响。
Based on dynamic field test of pre-stressed sheet-pile wall and the embankment in a section of Shao—huai expressway,multiple measuring points under the embankment and pre-stressed sheet-pile wall was measured.According to the results of field test,the changing relationship of the dynamic strain of embankment and pre-stressed sheet-pile wall due to the variation of traffic load and the speed of vehicles was investigated.With the help of(finite element) numerical simulation.The results show that the dynamic strain in the subgrade and pre-stressed sheet-pile wall has a close relationship with the vehicle loads,while it is unconspicious with the speed of vehicle.Moreover,the dynamic strain presents an obvious attenuate law with the increese of depth,and the influence depth of vehicle loads on embankment and retaining wall is approximately 2.5 m.Hence,in the design of retaining wall,more attention should be paid to the traffic loads' influence on the stability of sheet-pile wall.
Based on dynamic field test of pre-stressed sheet-pile wall and the embankment in a section of Shao—huai expressway,multiple measuring points under the embankment and pre-stressed sheet-pile wall was measured.According to the results of field test,the changing relationship of the dynamic strain of embankment and pre-stressed sheet-pile wall due to the variation of traffic load and the speed of vehicles was investigated.With the help of(finite element) numerical simulation.The results show that the dynamic strain in the subgrade and pre-stressed sheet-pile wall has a close relationship with the vehicle loads,while it is unconspicious with the speed of vehicle.Moreover,the dynamic strain presents an obvious attenuate law with the increese of depth,and the influence depth of vehicle loads on embankment and retaining wall is approximately 2.5 m.Hence,in the design of retaining wall,more attention should be paid to the traffic loads' influence on the stability of sheet-pile wall.
引文
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[3]李金贝,张鸿儒,李志强.填方路基振动台动力破坏试验研究[J].岩土力学,2011,32(10):3075-3080.LI Jinbei,ZHANG Hongru,LI Zhingqiang.Experimentalstudy of dynamic failure of fill subgrades using a shakingtable[J].Rock and Soil Mechanics,2011,32(10):3075-3080.
[4]韩志型,王宁,刘剑旗.加筋挡土墙地震动力响应规律及地震动参数影响研究[J].矿业研究与开发,2011,31(5):46-50.HANG Zhixing,WANG Ning,LIU Jianqi.Study on theseismic dynamic response law of reinforced soil retainingwall and the effect of strong ground motion parameters onits seismic response[J].Mining Research and Develop-ment,2011,31(5):46-50.
[5]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.ZHANG Youba.Study and engineering application of sup-porting technology applied on retaining wall laid on unsta-ble slope[D].Beijing:Beijing University of Science andTechnology.School of Civil and Environment Engineer-ing,2003.
[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 and dynam-ic respond analysis on reinforced earth wall under repeatedload[J].Chinese Journal of Rock Mechanics and Engi-neering,2002,21(10):1541-1546.
[7]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.DENG Xuejun,SUN Lu.Predicting dynamic vertical loadcaused by vehicle-pavement interaction[M].Beijing:People's Commutations Press,2000.
[8]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 Xuejun,LI Chang.The stress of road structureunder horizontal load[J].Chinese Journal of GeotechnicalEngineering,2002,24(4):427-431.
[9]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 Xianghua,HUANG Xiaoming.Analysis and calcu-lation of frequency domain simulations of dynamic load[J].Wuhan Urban Construction Institute,2003,20(4):47-50.
[10]李晓娜,李云涛.重载车辆对路面的动荷冲击作用分析[J].黑龙江交通科技,2012(10):6-8.LI Xiaona,LI Yuntao.Analysis on pavement dynamicresponse under heavy vehicle loads[J].CommunicationsScience and Technology Heilongjiang,2012(10):6-8.
[11]赵健,李振存,郭昕,等.汽车荷载作用下沥青路面公路动力响应数值模拟[J].铁道科学与工程学报,2012,9(5):83-89.ZHAO Jian,LI Zhencun,GUO Xin.Numerical analysis ofbitumen-surface highway dynamic response under vehi-cle loads[J].Railway Science and Engineering,2012,9(5):83-89.
[12]何海鹰.高速公路路基动力响应现场试验与数值分析[J].长沙理工大学学报:自然科学版,2012,9(2):13-18.HE Haiying.The field test and numerical analysis of ex-pressway subgrade dynamic response[J].Changsha Uni-versity of Science&Technology:Natural Science,2012,9(2):13-18.
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