高路堤填石料的蠕变试验及本构模型研究
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摘要
随着高速公路向山区的不断延伸,高填石路堤已经成为最常见的路堤形式。国内外高填石路堤的沉降统计资料表明,高填石路堤建成后的工后沉降明显,而且其持续时间可达2-3年之久。这表明高填石路堤的工后沉降具有明显的时间效应。填石料在高应力作用下蠕变量会变大,沪蓉西高速公路建设中存在着70多米的高路堤,研究填石料蠕变的时间效应就显得尤为重要,有必要深入探讨其蠕变机理。
本文以沪蓉西高速公路为背景,对干沟高填石路堤的填石料进行了长时间的蠕变试验研究。首先对填石料的蠕变试验的方案和试样的制备情况进行了相关的介绍,随后通过三轴剪切试验和压缩试验得到了填石料的一些物理力学特性,并通过对试验成果的分析得到了邓肯张模型的参数,在对高填石路堤的蠕变本构模型研究之后,通过对蠕变试验成果的分析,发现采用九参数蠕变本构模型可以很好描述填石料的蠕变特性,并通过对填石料的轴向蠕变和体积蠕变分析得到了填石料的九参数模型的参数值,最后为了研究填石料在单向压缩状态下的蠕变特性,进行了单向压缩蠕变试验,并与三轴蠕变试验成果进行了对比,结果表明,单向压缩蠕变量只相当于三轴剪切蠕变试验中某级的应力水平下的试验成果,由此可知如果要反映复杂应力状态的填石料的蠕变特性,应该采用三轴剪切蠕变试验。本文得到的填石料的蠕变特性和模型参数对于研究高填石路堤的工后沉降有很好的指导和应用价值。
As highway continuously extending into mountain areas, the high rock filled embankment has become the most common embankment form. Statistics about domestic and foreign high rock filled embankment shows that there is an obvious post construction settlement to high rock filled embankment with the duration up to 2 3 years. That is to say there is a significant time effect to the after construction settlement of high rock filled embankment. The creep of rockfill material under high stress becomes large. There are more than 70 meters high embankments within the construction of West shanghai chengdu Highway, therefore the research on time effect of rockfill material is particularly important.
The paper, on the basis of West shanghai chengdu highway, has made a long term creep test research on the rockfill material of waterless ditch high rock filled embankment. First, makes a relevance introduction on the preparation programs of creep test scheme and sample of rockfill material, then gets some the physical mechanics properties of rockfill material by triaxial shear test and compression test, also the Duncan Chang model parameters by the analysis on test result. After the research on creep constitutive model of high rock filled embankment, with the analysis on creep test result, the author finds that it can well describe the creep characteristics of rockfill material with nine parameters creep constitutive model. Also gets the parameter values of nine parameters model of rockfill material from the analysis on axial creep and volumetric creep. Carries out uniaxial compression creep tests in order to study the creep properties of rockfill material in uniaxial compression. The comparison shows that uniaxial compression creep is just as the stress of certain grade in triaxial shear creep test. It can be seen if you want to reflect the creep properties of rockfill material under complex state of stress, triaxial shear creep test should be used. The creep properties of rockfill material and model parameters in the paper have a very good guiding value and applying value for the study of after construction settlement to high rock filled embankment.
本文以沪蓉西高速公路为背景,对干沟高填石路堤的填石料进行了长时间的蠕变试验研究。首先对填石料的蠕变试验的方案和试样的制备情况进行了相关的介绍,随后通过三轴剪切试验和压缩试验得到了填石料的一些物理力学特性,并通过对试验成果的分析得到了邓肯张模型的参数,在对高填石路堤的蠕变本构模型研究之后,通过对蠕变试验成果的分析,发现采用九参数蠕变本构模型可以很好描述填石料的蠕变特性,并通过对填石料的轴向蠕变和体积蠕变分析得到了填石料的九参数模型的参数值,最后为了研究填石料在单向压缩状态下的蠕变特性,进行了单向压缩蠕变试验,并与三轴蠕变试验成果进行了对比,结果表明,单向压缩蠕变量只相当于三轴剪切蠕变试验中某级的应力水平下的试验成果,由此可知如果要反映复杂应力状态的填石料的蠕变特性,应该采用三轴剪切蠕变试验。本文得到的填石料的蠕变特性和模型参数对于研究高填石路堤的工后沉降有很好的指导和应用价值。
As highway continuously extending into mountain areas, the high rock filled embankment has become the most common embankment form. Statistics about domestic and foreign high rock filled embankment shows that there is an obvious post construction settlement to high rock filled embankment with the duration up to 2 3 years. That is to say there is a significant time effect to the after construction settlement of high rock filled embankment. The creep of rockfill material under high stress becomes large. There are more than 70 meters high embankments within the construction of West shanghai chengdu Highway, therefore the research on time effect of rockfill material is particularly important.
The paper, on the basis of West shanghai chengdu highway, has made a long term creep test research on the rockfill material of waterless ditch high rock filled embankment. First, makes a relevance introduction on the preparation programs of creep test scheme and sample of rockfill material, then gets some the physical mechanics properties of rockfill material by triaxial shear test and compression test, also the Duncan Chang model parameters by the analysis on test result. After the research on creep constitutive model of high rock filled embankment, with the analysis on creep test result, the author finds that it can well describe the creep characteristics of rockfill material with nine parameters creep constitutive model. Also gets the parameter values of nine parameters model of rockfill material from the analysis on axial creep and volumetric creep. Carries out uniaxial compression creep tests in order to study the creep properties of rockfill material in uniaxial compression. The comparison shows that uniaxial compression creep is just as the stress of certain grade in triaxial shear creep test. It can be seen if you want to reflect the creep properties of rockfill material under complex state of stress, triaxial shear creep test should be used. The creep properties of rockfill material and model parameters in the paper have a very good guiding value and applying value for the study of after construction settlement to high rock filled embankment.
引文
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[2]张洪林,谢婉丽,刘荣佩.土石粗粒料的弹塑性本构模型研究[J].岩土工程技术,2002, (2):95-99.
[3]罗刚,张建民.邓肯-张模型和沈珠江双屈服面模型的改进[J].岩土力学,2004,25(6):887-890.
[4]张建民,.罗刚.考虑可逆与不可逆剪胀的粗粒土动本构模型[J].岩土工程学报,2005,27(2):178-184.
[5]张丙印,贾延安,张宗亮.堆石体修正Rowe剪胀方程与南水模型[J].岩土工程学报,2007,29(10):1443-1448.
[6]孙海忠,黄茂松.考虑粗粒土应变软化特性和剪胀性的本构模型[J].同济大学学报,2009,37(6):727-732.
[7]张丙印,孙国亮,张宗亮.堆石体的劣化变形和本构模型[J].岩土工程学报,2010,32(1):98-103.
[8]相彪.粗粒土的扰动状态本构模型及其参数确定[D]:[硕士论文].大连:大连理工大学,2005.
[9]徐远杰,潘家军,楚锡华等.基于扰动状态概念的堆石料本构模型研究[J].工程力学,2010,27(6):154-161.
[10]贾宇峰,迟世春等.考虑颗粒破碎的粗粒土剪胀性统一本构模型[J].岩土力学,2010,31(5):1381-1388.
[11] Dafalias Y F. Bounding surface plasticity I:Mathematical foundation and hypoplasticity[J]. Journal of Engineering Mechanics,ASCE,1986,112(9):966-987.
[12]吴兴征,栾茂田,李相菘.复杂加载路径下堆石料动力本构模型及数值模拟[J].世界地震工程,2001,17(1):9-14.
[13]岑威钧.亚塑性本构模型的隐式数值积分算法[J].水利学报,2007,38(3):319-324.
[14]吴长彬,张岩,许小东.亚塑性本构模型的理论对比分析[J].灾害与防治工程,2009,67(2):8-14.
[15]陈铁林,陈水生,周成等.粘土的流变特性分析[J].岩土工程学报,2001,23(3):279-283.
[16]左永振.粗粒料的蠕变和湿化试验研究[D]:[硕士论文].武汉:长江科学院,2001,60-72.
[17]韩世莲.土和碎石混合料的蠕变试验研究[J].岩土工程学报,1999,21(2):196-1999.
[18]郑治.填石料的长期变形性能模拟试验研究[J].中国公路学报,2001,14(2):18-21.
[19]梁军,刘汉龙.面板坝堆石料的蠕变试验研究[J].岩土工程学报,2002,24(2):257-260.
[20]谢宁.土流变试验设计及有关问题研究[J].云南工学院学报,1994,10(4):76-92.
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