高速铁路加筋土挡墙土工格栅蠕变损伤本构模型研究
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摘要
基于土工格栅加筋土挡墙良好的工程特性,在高速铁路路基中具有广泛的应用前景。土工格栅在一定环境温度和荷载水平的长期作用下会发生蠕变变形,将影响加筋土挡墙的长期工作性能。基于不同温度(20℃、30℃、40℃、50℃)和不同荷载水平(35%、40%、45%、50%、60%)下土工格栅蠕变的试验结果,分析温度和荷载对土工格栅蠕变过程的影响特性,建立了土工格栅的黏弹塑性蠕变损伤本构模型,确定了蠕变损伤模型的各指标参数值。通过室内蠕变试验结果与蠕变损伤模型理论结果的对比,论证了该本构模型的合理性与可靠性。最后,通过对土工格栅蠕变损伤模型各参数进行敏感性分析,认为塑性系数R和损伤材料参数a、n越大,土工格栅的恒速蠕变阶段越短,越容易发生加速蠕变断裂。研究结果可为高速铁路加筋土挡墙长期性能评价与工程设计提供参考。
Given its good engineering properties, geogrid-reinforced earth retailing wall has extensive application prospects in the construction of high-speed railway subgrade. The geogrids usually produce creep deformation under long-term action of tensile force at a given environment temperature. Such creep characteristics will affect the long-term performance of reinforced earth structure. In order to investigate the creep damage property of geogrids, the effects of temperature and load on the whole creep damage process were analyzed on the basis of the experimental results of geogrids specimens. The viscoelastic-plastic-creep damage constitutive model of geogrids was presented. Meanwhile, the creep parameters of geogrids at different temperatures and loads were determined. The comparison of the experimental results with the theoretical results of creep damage model proved that the rationality and reliability of the constitutive model. Finally, a sensitivity analysis of the creep model parameters was carried out, showing the effects of creep parameters on creep strain of geogrids. It shows that larger plasticity coefficient and damage material parameters lead to a shorter steady-state creep process and earlier onset of the tertiary accelerated process. The research results provide reference for the long-term performance evaluation and engineering design of reinforced earth retaining wall of high-speed railway.
Given its good engineering properties, geogrid-reinforced earth retailing wall has extensive application prospects in the construction of high-speed railway subgrade. The geogrids usually produce creep deformation under long-term action of tensile force at a given environment temperature. Such creep characteristics will affect the long-term performance of reinforced earth structure. In order to investigate the creep damage property of geogrids, the effects of temperature and load on the whole creep damage process were analyzed on the basis of the experimental results of geogrids specimens. The viscoelastic-plastic-creep damage constitutive model of geogrids was presented. Meanwhile, the creep parameters of geogrids at different temperatures and loads were determined. The comparison of the experimental results with the theoretical results of creep damage model proved that the rationality and reliability of the constitutive model. Finally, a sensitivity analysis of the creep model parameters was carried out, showing the effects of creep parameters on creep strain of geogrids. It shows that larger plasticity coefficient and damage material parameters lead to a shorter steady-state creep process and earlier onset of the tertiary accelerated process. The research results provide reference for the long-term performance evaluation and engineering design of reinforced earth retaining wall of high-speed railway.
引文
[1] 国家铁路局.TB 10621—2014,J1942—2014高速铁路设计规范[S].北京:中国铁道出版社,2014.
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[11] LING H I,LIU H B.Finite Element Studies of Asphalt Concrete Pavement Reinforced with Geogrid[J].Journal of Engineering Mechanics,2003,129(7):801-811.
[12] SUGIMOTO M,ALAGIYAWANNA A M N.Pullout Behavior of Geogrid by Test and Numerical Analysis[J].Journal of Geotechnical and Geoenvironmental Engineering,2003,129(4):361-371.
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[14] 栾茂田,肖成志,杨庆,等.土工格栅蠕变特性的试验研究及黏弹性本构模型[J].岩土力学,2005,26(2):187-190.LUAN Maotian,XIAO Chengzhi,YANG Qing,et al.Experimental Study on Creep Properties and Viscoelasticity Constitutive Model for Geogrids[J].Rock and Soil Mechanics,2005,26(2):187-190.
[15] 肖成志,栾茂田,杨庆,等.土工格栅经验型蠕变模型及其参数试验[J].中国公路学报,2006,19(6):19-24.XIAO Chengzhi,LUAN Maotian,YANG Qing,et al.Experiment on Empirical Creep Model and Its Parameters of Geogrids[J].China Journal of Highway and Transport,2006,19(6):19-24.
[16] 周志刚,李雨舟.基于土工格栅黏弹特性的加筋土本抅模型研究[J].岩石力学与工程学报,2011,30(4):850-857.ZHOU Zhigang,LI Yuzhou.Research on Constitutive Model of Reinforced Soil Considering Viscoelasticity of Geogeids[J].Chinese Journal of Rock Mechanics and Engineering,2011,30(4):850-857.
[17] 周志刚,李雨舟.土工格栅蠕变特性及其黏弹塑性损伤本构模型研究[J].岩土工程学报,2011,33(12):1943-1949.ZHOU Zhigang,LI Yuzhou.Creep Properties and Viscoelastic-Plastic- Damaged Constitutive Model of Geogrid[J].Chinese Journal of Geotechnical Engineering,2011,33(12):1943-1949.
[18] 中国铁路总公司.Q/CR 549.2—2016 铁路工程土工合成材料第2部分:土工格栅[S].北京:中国铁道出版社,2016.
[19] 李兆霞.损伤力学及其应用[M].北京:科学出版社,2002.
[2] 国家铁路局.TB 10623—2014 城际铁路设计规范[S].北京:中国铁道出版社,2014.
[3] HSIEHL C W,LEE K,YOO H K,et al.Tensile Creep Behavior of Polyester Geogrids by Conventional and Accelerated Test Methods[J].Fibers and Polymers,2008,19(4):476-480.
[4] 杨果林.加筋土筋材长期荷载蠕变试验研究[J].煤炭学报,2001,26(2):132-136.YANG Guolin.Study on Creep Test of Geosynthetics[J].Journal of China Coal Society,2001,26(2):132-136.
[5] 丁德斌,将江松,何光春,等.土工格栅蠕变特性试验研究[J].公路交通技术,2006(4):25-29.DING Debin,JIANG Jiangsong,HE Guangchun,et al.Test and Research on Geogrid Creep Features[J].Technology of Highway and Transport,2006(4):25-29.
[6] 栾茂田,肖成志,杨庆,等.长期荷载作用下土工格栅蠕变特性的试验研究[J].土木工程学报,2006,39(4):87-91.LUAN Maotian,XIAO Chengzhi,YANG Qing,et al.An Experimental Study on the Creep Behavior of Geogrids under Long-term External Loading[J]. China Civil Engineering Journal,2006,39(4):87-91.
[7] FARRAG K.Development of An Accelerated Creep Testing Procedure for Geosynthetics,Part Ⅱ:Analysis[J].Geotechnical Testing Journal,1998,20(4):38-44.
[8] THORNTON J S,PAULSON D.Conventional and Stepped Isothermal Methods for Characterizing Long Term Creep Strength of Polyester Geogrids[C]//Sixth International Conference on Geosynthetica. Atlanta:GA,1998:691-698.
[9] 李丽华,王钊,唐建设.时温叠加法确定土工合成材料蠕变折减系数[J].岩土力学,2005,26(1):113-116.LI Lihua,WANG Zhao,TANG Jianshe.Determination of Creep Reduction Factor of Geosynthetics by Time-temperature Superposition[J].Rock and Soil Mechanics,2005,26(1):113-116.
[10] 李丽华,王钊,陈轮.加速土工合成材料蠕变试验的荷载叠加法[J].岩土工程学报,2007,29(3):410-413.LI Lihua,WANG Zhao,CHEN Lun.Load Superposition for Accelerating Creep Test of Geosynthetics[J].Chinese Journal of Geotechnical Engineering,2007,29(3):410-413.
[11] LING H I,LIU H B.Finite Element Studies of Asphalt Concrete Pavement Reinforced with Geogrid[J].Journal of Engineering Mechanics,2003,129(7):801-811.
[12] SUGIMOTO M,ALAGIYAWANNA A M N.Pullout Behavior of Geogrid by Test and Numerical Analysis[J].Journal of Geotechnical and Geoenvironmental Engineering,2003,129(4):361-371.
[13] SIRIWARDANE H,GONDLE R,KUTUK B.Analysis of Flexible Pavements Reinforced with Geogrids[J].Geotechnical & Geological Engineering,2010,28(3):287-297.
[14] 栾茂田,肖成志,杨庆,等.土工格栅蠕变特性的试验研究及黏弹性本构模型[J].岩土力学,2005,26(2):187-190.LUAN Maotian,XIAO Chengzhi,YANG Qing,et al.Experimental Study on Creep Properties and Viscoelasticity Constitutive Model for Geogrids[J].Rock and Soil Mechanics,2005,26(2):187-190.
[15] 肖成志,栾茂田,杨庆,等.土工格栅经验型蠕变模型及其参数试验[J].中国公路学报,2006,19(6):19-24.XIAO Chengzhi,LUAN Maotian,YANG Qing,et al.Experiment on Empirical Creep Model and Its Parameters of Geogrids[J].China Journal of Highway and Transport,2006,19(6):19-24.
[16] 周志刚,李雨舟.基于土工格栅黏弹特性的加筋土本抅模型研究[J].岩石力学与工程学报,2011,30(4):850-857.ZHOU Zhigang,LI Yuzhou.Research on Constitutive Model of Reinforced Soil Considering Viscoelasticity of Geogeids[J].Chinese Journal of Rock Mechanics and Engineering,2011,30(4):850-857.
[17] 周志刚,李雨舟.土工格栅蠕变特性及其黏弹塑性损伤本构模型研究[J].岩土工程学报,2011,33(12):1943-1949.ZHOU Zhigang,LI Yuzhou.Creep Properties and Viscoelastic-Plastic- Damaged Constitutive Model of Geogrid[J].Chinese Journal of Geotechnical Engineering,2011,33(12):1943-1949.
[18] 中国铁路总公司.Q/CR 549.2—2016 铁路工程土工合成材料第2部分:土工格栅[S].北京:中国铁道出版社,2016.
[19] 李兆霞.损伤力学及其应用[M].北京:科学出版社,2002.