列车动荷载作用下桩网结构路基土拱效应分析
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摘要
目前对桩网结构路基的研究多是基于静力作用进行的。本文采用ABAQUS有限元分析软件,计算分析了列车动荷载作用对桩网结构路基土拱效应的影响。结果表明:动荷载对土拱效应的影响与路基高度、土工格栅和桩间土性质密切相关;当路基内部形成完整土拱时,动荷载对土拱效应基本无影响,但会引起低矮路基中的非完整土拱发生失稳、退化;土工格栅的存在可以减小动荷载对土拱效应的影响;桩间土较软时,动荷载对土拱效应的影响更为明显。
The research on subgrade supported by geogrid-pile system is more likely based on static action.Nature arch effect in subgrade supported by geogrid-pile system under train dynamic load action was studied by using ABAQUS finite element software in this paper.The results showthat the influence of dynamic load on natural arch effect is closely related to subgrade height,geogrid and soil properties.When the complete natural arch is formed in the subgrade,the dynamic load has no effect on the natural arch effect,but it will cause instability and degeneration of the incomplete natural arch in the lowsubgrade.The existence of geogrid can reduce the influence of dynamic load on natural arch effect.The influence of dynamic load on natural arch effect is more obvious when the soil between piles is soft.
The research on subgrade supported by geogrid-pile system is more likely based on static action.Nature arch effect in subgrade supported by geogrid-pile system under train dynamic load action was studied by using ABAQUS finite element software in this paper.The results showthat the influence of dynamic load on natural arch effect is closely related to subgrade height,geogrid and soil properties.When the complete natural arch is formed in the subgrade,the dynamic load has no effect on the natural arch effect,but it will cause instability and degeneration of the incomplete natural arch in the lowsubgrade.The existence of geogrid can reduce the influence of dynamic load on natural arch effect.The influence of dynamic load on natural arch effect is more obvious when the soil between piles is soft.
引文
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[11]韩高孝,宫全美,周顺华.摩擦型岩土材料土拱效应微观机制颗粒流模拟分析[J].岩土力学,2013,34(6):1791-1798.
[12]蔡德钩,闫宏业,叶阳升,等.桩网支承路基结构中土拱效应及网垫受力的模型试验研究[J].铁道学报,2011,33(11):85-92.
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[14]韩高孝,宫全美,周顺华.列车动荷载下桩网结构路基土拱效应试验研究[J].岩土力学,2014,35(6):1600-1606.
[15]FU L L,GONG Q M,WANG Y.Analysis on Dynamic Transfer Characteristics of Low Geosynthetic-reinforced Embankments Supported by CFG Piles Subjected to High-speed Railway[J].Advanced Materials Research,2012,368-373:2575-2580.
[16]宫全美,张达石.高速铁路地基刚度的合理取值范围[J].同济大学学报(自然科学版),2004,32(10):1390-1393.
[17]HEITZ C,LKING J,KEMPFERT H G. Geosynthetic Reinforced and Pile Supported Embankments Under Static and Cyclic Loading[C]//Proceedings of the 4th European Geosynthetics Conference.Edinburgh,UK:[s.n.],2008.
[2]LOW B K,TANG S K,CHOA V.Arching in Piled Embankments[J]. ASCE Journal of Geotechnical Engineering,1994,120(11):1917-1938.
[3]HEWLETT W J,RANDOLPH M F.Analysis of Piled Embankments[J].Ground Engineering,1988(4):12-18.
[4]ROGBECK Y,GUSTAVSSON S,SDERGRE I,et al. Reinforced Piled Embankments in Sweden—Design Aspects[C]//The Organizing Committee of the 6th International Conference on Geosynthetics.Proceedings of the 6th International Conference on Geosynthetics. Atlanta,USA:The Industrial Fabrics Association International,1998:755-762.
[5]British Standard Institute. Strengthened/reinforced Soils and Other Fills:BS 8006[S]. London:BSI Standard Publication,1995.
[6]Deutsche Gesellschaft Fur Geotechnike E V. Entwurf Der Empfeblung“Bewehrte Erdkorper Auf Punkf Order Linienfomigen Traggliendern”:EBGEO[S]. Berlin:Ernst&Sohn,2004.
[7]Nordic Geotechnical Society. Nordic Handbook. Reinforced Soils and Fills:NORDIC[S]. Stockholm:Nordic Geotechnical Society,2002.
[8]JONES C J F P,LAWSON C R,AYRES D J.Geotextile Reinforced Piled Embankments[C]//The Organizing Committee of 4th International Conference on Geotextiles,Geomemberances and Related Products. Proceedings of 4th International Conference on Geotextiles,Geomemberances and Related Products.Balkema:Publish Rotterdam,1990:155-160.
[9]杨涛,王刚刚,闫业强,等.桩承式路堤中土拱形态与成拱过程中土拱效应研究[J].岩土工程学报,2014,36(4):731-735.
[10]YAN L,YANG J S,HAN J.Parametric Study on Geosyntheticreinforced Pile-supported Embankments[C]//Proceedings of Geo Shanghai 06,Advances in Earth Structures. Shanghai:Geotechnical Special Publication,2006:255-261.
[11]韩高孝,宫全美,周顺华.摩擦型岩土材料土拱效应微观机制颗粒流模拟分析[J].岩土力学,2013,34(6):1791-1798.
[12]蔡德钩,闫宏业,叶阳升,等.桩网支承路基结构中土拱效应及网垫受力的模型试验研究[J].铁道学报,2011,33(11):85-92.
[13]费康,陈毅,王军军.桩承式路堤土拱效应发挥过程研究[J].岩土力学,2013,34(5):1367-1374.
[14]韩高孝,宫全美,周顺华.列车动荷载下桩网结构路基土拱效应试验研究[J].岩土力学,2014,35(6):1600-1606.
[15]FU L L,GONG Q M,WANG Y.Analysis on Dynamic Transfer Characteristics of Low Geosynthetic-reinforced Embankments Supported by CFG Piles Subjected to High-speed Railway[J].Advanced Materials Research,2012,368-373:2575-2580.
[16]宫全美,张达石.高速铁路地基刚度的合理取值范围[J].同济大学学报(自然科学版),2004,32(10):1390-1393.
[17]HEITZ C,LKING J,KEMPFERT H G. Geosynthetic Reinforced and Pile Supported Embankments Under Static and Cyclic Loading[C]//Proceedings of the 4th European Geosynthetics Conference.Edinburgh,UK:[s.n.],2008.