土工格栅加筋路堤时效性及参数敏感性分析
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摘要
为探讨土工格栅加筋路堤时效性及参数敏感性,基于大型通用有限元分析软件ADINA,建立路堤-土工格栅-软弱场地体系耦合数值分析模型,研究了加筋方式、筋材弹性模量、筋材间距及路堤填料性质对路堤施工阶段及运营阶段加筋效果时效性的影响规律,并在此基础上设计"四因素,三水平"正交试验进行参数敏感性分析。计算结果表明:从实效与经济两方面考虑,全路段、路堤与软基界面处一层加筋为较合理的加筋方式;筋材弹性模量、路堤填筑材料泊松比、内摩擦角和黏聚力越大,路堤加筋效果越好;相对于筋材材料参数及加筋间距,路堤加筋效果对路堤填料土性参数的敏感性更高。该研究成果可为土工格栅加筋软土路堤的设计与施工提供参考。
In order todiscuss the time effectand the sensitivity of geogrid reinforced embankment,numerical models of reinforced embankment on soft subgrade are established based on the FEM code ADINA.The influences of the reinforcement mode,the elastic modulus of geogrid,the geogridlayout and the properties of embankment filler on the reinforcement effect during both construction and operation stages are investigated.Furthermore,aparameter sensitivity analysis is carried out.The numerical results show that:with the increase of the elastic modulus of the reinforced material,the Poisson's ratio as well as the friction angle and the cohesion of embankment filling material,the reinforcement effect of the embankment is improved;in contrast to the mechanical properties and layout of geogrid,the reinforcement effect of embankment is more sensitive to the soil parameters of embankment filler.The relevant conclusions can provide reference for the design and construction of geogrid reinforced embankment on the soft subgrade.
In order todiscuss the time effectand the sensitivity of geogrid reinforced embankment,numerical models of reinforced embankment on soft subgrade are established based on the FEM code ADINA.The influences of the reinforcement mode,the elastic modulus of geogrid,the geogridlayout and the properties of embankment filler on the reinforcement effect during both construction and operation stages are investigated.Furthermore,aparameter sensitivity analysis is carried out.The numerical results show that:with the increase of the elastic modulus of the reinforced material,the Poisson's ratio as well as the friction angle and the cohesion of embankment filling material,the reinforcement effect of the embankment is improved;in contrast to the mechanical properties and layout of geogrid,the reinforcement effect of embankment is more sensitive to the soil parameters of embankment filler.The relevant conclusions can provide reference for the design and construction of geogrid reinforced embankment on the soft subgrade.
引文
[1]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.
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[10]翁升,马时冬.土工布加筋垫层对路基变形和稳定的影响[J].岩土力学,2001,22(1):42-46.
[11]钱劲松,凌建明,黄琴龙.土工格栅加筋路堤的三维有限元分析[J].同济大学学报:自然科学版,2003,31(12):1421-1425.
[12]陈建峰,石振明,孙红.加筋路堤稳定性综合分析方法[J].岩土力学,2004,25(s2):433-436.
[13]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).
[14]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.
[15]王协群,张俊峰,邹维列,等.格栅-土界面抗剪强度模型及其影响因素[J].土木工程学报,2013,(4):133-141.
[16]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.
[2]H Vidal.The principle of reinforced earth[R].Washington D.C.:Highway Research Record,1969.
[3]Kaniraj S R,Abdullah H.Stability Analysis of Reinforced Embankments on Soft Soils[J].Journal of Geotechnical Engineering,1992,118(12):1994-1999.
[4]喻泽红,韩理安.土工网处理桥头差异沉降的有限元分析[J].岩土工程学报,1996,18(6):24-30.
[5]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.
[6]El-Naggar M E,Kennedy J B.New design method for reinforced sloped embankments[J].Engineering Structures,1997,19(1):28-36.
[7]徐少曼.关于土工织物加筋堤坝软基问题[J].福州大学学报,1999,27(2):76-80.
[8]Yoo C.Laboratory investigation of bearing capacity behavior of strip footing on geogrid-reinforced sand slope[J].Geotextiles&Geomembranes,2001,19(5):279-298.
[9]唐芬,唐红梅,陈洪凯.对加筋地基承载力与沉降问题的认识[J].地下空间与工程学报,2001,21(5):532-535.
[10]翁升,马时冬.土工布加筋垫层对路基变形和稳定的影响[J].岩土力学,2001,22(1):42-46.
[11]钱劲松,凌建明,黄琴龙.土工格栅加筋路堤的三维有限元分析[J].同济大学学报:自然科学版,2003,31(12):1421-1425.
[12]陈建峰,石振明,孙红.加筋路堤稳定性综合分析方法[J].岩土力学,2004,25(s2):433-436.
[13]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).
[14]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.
[15]王协群,张俊峰,邹维列,等.格栅-土界面抗剪强度模型及其影响因素[J].土木工程学报,2013,(4):133-141.
[16]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.