饱和软土场地格栅加筋路堤地震动力响应分析
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摘要
为探讨饱和软土场地中格栅加筋路堤地震动力响应特性规律,基于大型通用有限元分析软件ADINA,建立了饱和软土地基上格栅加筋路堤的数值分析模型,研究了布筋方式、筋材弹性模量与间距及路堤填料性质对格栅加筋路堤地震动力响应的影响规律.结果表明:增大筋材弹性模量可有效提升路堤动力稳定性,且筋材越靠近路堤底部其效果越显著;随着加筋层数增加,加筋效果提升率有所衰减;增加填料摩擦角和填料黏聚力可提高加筋路堤动力性能,但填料土性参数达到一定幅值后,其变化所引起动力性能提升效果降低.
In order to discuss the dynamic response characteristics of geogrid reinforced embankment in saturated soft subgrade,numerical models for the interaction system of geogrid reinforced embankment and saturated soft subgrade were established to investigate the effects of the reinforcement mode,the elastic modulus of geogrid,the geogrid spacing and the properties of embankment filler on the dynamic response of geogrid reinforced embankment.The numerical results show that the increasing elastic modulus of geogrid can significantly improve the dynamic performance of embankment when the geogrid is close to the bottom of embankment;the reinforcement effect decays with the increase of geogrid layers;the increasing internal friction angle and cohesion of embankment filler can improve the dynamic performance of geogrid reinforced embankment and the effect attenuates when material parameters reach to certain values.
In order to discuss the dynamic response characteristics of geogrid reinforced embankment in saturated soft subgrade,numerical models for the interaction system of geogrid reinforced embankment and saturated soft subgrade were established to investigate the effects of the reinforcement mode,the elastic modulus of geogrid,the geogrid spacing and the properties of embankment filler on the dynamic response of geogrid reinforced embankment.The numerical results show that the increasing elastic modulus of geogrid can significantly improve the dynamic performance of embankment when the geogrid is close to the bottom of embankment;the reinforcement effect decays with the increase of geogrid layers;the increasing internal friction angle and cohesion of embankment filler can improve the dynamic performance of geogrid reinforced embankment and the effect attenuates when material parameters reach to certain values.
引文
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[15]刘蓓蓓,张孟喜,王东.基于强度折减法的土工格室加筋路堤稳定性分析[J].上海大学学报(自然科学版),2018,24(2):287-295.LIU Beibei,ZHANG Mengxi,WANG Dong.Stability analysis of geocell reinforced embankment with strength reduction method[J].Journal of Shanghai University(Natural Science Edition),2018,24(2):287-295.
[16]梁程,徐超.土工格室加筋土垫层路堤临界高度研究[J].岩土力学,2018(8):1-7.LIANG Cheng,XU Chao.Study on critical height of reinforced embankments with geocell layer[J].Rock and Soil Mechanics,2018(8):1-7.
[17]马野,袁志丹,曹金凤.ADINA有限元经典实例分析[M].北京:机械工业出版社,2012.MA Ye,YUAN Zhidan,CAO Jinfeng.ADINA finite element classic case analysis[M].Beijing:China Machine Press,2012.
[2]秦道标.土工格栅加筋软土路堤的有限元分析[J].中国公路,2011(7):106-107.QIN Daobiao.Finite element analysis of soft soil subgrade reinforced by geogrids[J].China Highway,2011(7):106-107.
[3]VIDAL H.The principle of reinforced earth[R].Washington D C:Highway Research Record,1969.
[4]ADAMS M T,COLLIN J G.Large model spread footing load tests on geosynthetic reinforced soil foundations[J].Journal of Geotechnical&Geoenvironmental Engineering,1997,123(1):66-72.
[5]YOO C.Laboratory investigation of bearing capacity behavior of strip footing on geogrid-reinforced sand slope[J].Geotextiles&Geomembranes,2001,19(5):279-298.
[6]陈涛,郭院成,谢春庆.平坦地基上山区高填方路堤变形及稳定性分析[J].郑州大学学报(工学版),2009:30(3):39-43.CHEN Tao,GUO Yuancheng,XIE Chunqing.Analysis of deformation and stability of high embankment in flat ground of mountainous area[J].Journal of Zhengzhou University(Engineering Science),2009,30(3):39-43.
[7]张晏,费世江.高填方路堤施工期沉降变形的FLAC模拟[J].辽宁科技大学学报,2010,33(3):268-271.ZHANG Yan,FEI Shijiang.FLAC simulation of settlements and deformation of high embankment in construction period[J].Journal of University of Science and Technology Liaoning,2010,33(3):268-271.
[8]米慧杰,王玉鹏,罗烈日.土工格栅加筋高陡坡路堤稳定性及其影响因素分析[J].中外公路,2014,34(1):44-48.MI Huijie,WANG Yupeng,LUO Lieri.Analysis of stability and influencing factors of geogrid reinforced high steep slope embankment[J].Journal of China&Foreign Highway,2014,34(1):44-48.
[9]李丽华,任增乐,李广信,等.复合加筋路堤边坡振动台模型试验[J].西南交通大学学报,2017,52(3):496-504.LI Lihua,REN Zengle,LI Guangxin,et al.Shaking table model tests for composite reinforced slopes[J].Journal of Southwest Jiaotong University,2017,52(3):496-504.
[10]丁烈梅,郭超祥.中低压缩性土地基桩承式加筋路堤时效性分析[J].重庆交通大学学报(自然科学版),2017,36(5):40-44,50.DING Liemei,GUO Chaoxiang.Time-dependent behavior of geosynthetic-reinforced and pile-supported embankment of the soil with medium-low compressibility[J].Journal of Chongqing Jiaotong University(Natural Science),2017,36(5):40-44,50.
[11]田静.土工格栅加筋高填方路堤施工沉降分析[J].兰州工业学院学报,2017,24(6):36-40.TIAN Jing.Construction settlement analysis of reinforced geogrid high fill embankment[J].Journal of Lanzhou Institute of Technology,2017,24(6):36-40.
[12]胡卫国,何桥敏.土工格栅在填方路堤中的加筋作用试验研究[J].中外公路,2018,38(1):38-42.HU Weiguo,HE Qiaomin.Experimental study on reinforcing effect of Geogrid in embankment filled with embankment[J].Journal of China&Foreign Highway,2018,38(1):38-42.
[13]张军,牛玺荣,孙玲.黄土山区非对称加筋路堤受力特性研究[J].武汉大学学报(工学版),2017,50(3):422-428.ZHANG Jun,NIU Xirong,SUN ling.Study of mechanical characteristics of asymmetric reinforced-embankment in loess mountain region[J].Engineering Journal of Wuhan University,2017,50(3):422-428.
[14]衣倩倩,时伟,刘强森,等.沿海公路加筋地基动力特性数值模拟[J].工程建设,2017,49(9):32-36.YI Qianqian,SHI Wei,LIU Qiangsen,et al.Numerical simulation of dynamic characteristics of reinforced foundation in coastal highway[J].Engineering Construction,2017,49(9):32-36.
[15]刘蓓蓓,张孟喜,王东.基于强度折减法的土工格室加筋路堤稳定性分析[J].上海大学学报(自然科学版),2018,24(2):287-295.LIU Beibei,ZHANG Mengxi,WANG Dong.Stability analysis of geocell reinforced embankment with strength reduction method[J].Journal of Shanghai University(Natural Science Edition),2018,24(2):287-295.
[16]梁程,徐超.土工格室加筋土垫层路堤临界高度研究[J].岩土力学,2018(8):1-7.LIANG Cheng,XU Chao.Study on critical height of reinforced embankments with geocell layer[J].Rock and Soil Mechanics,2018(8):1-7.
[17]马野,袁志丹,曹金凤.ADINA有限元经典实例分析[M].北京:机械工业出版社,2012.MA Ye,YUAN Zhidan,CAO Jinfeng.ADINA finite element classic case analysis[M].Beijing:China Machine Press,2012.
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