滑带土分数阶损伤蠕变本构模型研究
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摘要
为研究滑坡滑带土的蠕变特性,采用ZLB-1型三联直剪蠕变仪对露天矿滑带土进行分级加载蠕变试验,并基于分数阶微积分及损伤力学理论建立了分数阶损伤蠕变本构模型.结果表明:在同一时刻,剪切蠕变变形随剪切载荷的增加而增大;当剪切载荷低于长期强度时,试样发生衰减蠕变;当剪切载荷高于长期强度时,试样发生等速蠕变及加速蠕变;滑带土蠕变的非线性程度随时间增加而提高.所建立的分数阶损伤蠕变本构模型对滑带土试样蠕变曲线的拟合决定系数在0.951 6～0.999 1,拟合精度较高,对蠕变三阶段都能够进行很好的描述.
In order to study the creep characteristics of landslide slip zone soil, the ZLB-1 triad direct shear creep instrument is used to do the experiment of creep behavior of landslide slip zone soil in open pit mine under graded loading. Fractional damage creep constitutive model is established on the base of fractional calculus and damage mechanics theory. The result shows that shear creep deformation increases with the growth of shear load at the same time; attenuated creep occurs when shear load is lower than long-term strength; isovelocity creep and accelerated creep occur when shear load is higher than long-term strength; and the nonlinearity of creep of sliding zone soil increases with the growth of time. The determination coefficient of the fitting curve is between 0.951 6 and 0.999 1, so that the fitting precision of the new type creep constitutive model is relatively high and the three stages of creep can be well described.
In order to study the creep characteristics of landslide slip zone soil, the ZLB-1 triad direct shear creep instrument is used to do the experiment of creep behavior of landslide slip zone soil in open pit mine under graded loading. Fractional damage creep constitutive model is established on the base of fractional calculus and damage mechanics theory. The result shows that shear creep deformation increases with the growth of shear load at the same time; attenuated creep occurs when shear load is lower than long-term strength; isovelocity creep and accelerated creep occur when shear load is higher than long-term strength; and the nonlinearity of creep of sliding zone soil increases with the growth of time. The determination coefficient of the fitting curve is between 0.951 6 and 0.999 1, so that the fitting precision of the new type creep constitutive model is relatively high and the three stages of creep can be well described.
引文
[1]赖小玲,叶为民,王世梅.滑坡滑带土非饱和蠕变特性试验研究[J].岩土工程学报,2012,34(2):286-293.LAI Xiaoling,YE Weimin,WANG Shimei.Experimental study on unsaturated creep characteristics of landslide soils[J].Chinese Journal of Geotechnical Engineering,2012,34(2):286-293.
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[3]WEN Baoping,JIANG Xiuzi.Effect of gravel content on creep behavior of clayey soil at residual state:implication for its role in slow-moving landslides[J].Landslides,2017,14(2):559-576.
[4]孙淼军,唐辉明,王潇弘,等.蠕动型滑坡滑带土蠕变特性研究[J].岩土力学,2017,38(2):385-391,399.SUN Miaojun,TANG Huiming,WANG Xiaohong,et al.Creep properties of sliding-zone soil from a creeping landslide[J].Rock and Soil Mechanics,2017,38(2):385-391,399.
[5]辛鹏,吴树仁,石菊松,等.簸箕山大型老滑坡滑动带的结构特征及形成机制试验研究[J].岩石力学与工程学报,2013,32(7):1 382-1 391.XIN Peng,WU Shuren,SHI Jusong,et al.Sructural characteristics of soft-rock slip zone and experimental study of its formulation mechanism in Boji mountain large-scale old landslide[J].Chinese Journal Rock mechanics and Engineering,2013,32(7):1 382-1 391.
[6]李纯.基于滑带土流变特性的黄土坡滑坡长期变形及时变稳定性研究[D].武汉:中国地质大学,2018.LI Chun.Long-term deformation and time-varying stability of Huangtupo landslide based on the rheological property of slip zone soil[D].Wuhan:China University of Geosciences,2018.
[7]刘汉东,李梦姿,杨继红.非饱和滑带土非线性Burgers蠕变模型[J].华北水利水电大学学报(自然科学版),2017,38(2):43-48.LIU Handong,LI Mengzi,YANG Jihong.Nonlinear Burgers creep model for unsaturated soil in slipping zone[J].Journal of North China University of Water Resources&Electric Power,2017,38(2):43-48.
[8]王来贵,戴罡,赵国超,等.软岩蠕变过程稳定性及反馈特性[J].辽宁工程技术大学学报(自然科学版),2015,34(9):993-998.doi:10.11956/j.issn.1008-0562.2015.09.001.WANG Laigui,DAI Gang,ZHAO Guochao,et al.Stability and the feedback characteristics process of the soft rock[J].Journal of Liaoning Technical University(Natural Science),2015,34(9):993-998.doi:10.11956/j.issn.1008-0562.2015.09.001.
[9]张树光,王有涛,林晓楠.东梁煤矿非饱和砂岩黏弹塑性蠕变分析[J].辽宁工程技术大学学报(自然科学版),2017,36(2):127-131.doi:10.11956/j.issn.1008-0562.2017.02.003.ZHANG Shuguang,WANG Youtao,LIN Xiaonan.Analysis on visco-elastic-plastic creep of unsaturated sandstone of Dongliang coal mine[J].Journal of Liaoning Technical University(Natural Science),2017,36(2):127-131.doi:10.11956/j.issn.1008-0562.2017.02.003.
[10]刘迪,周宏伟,赵阳,等.基于声发射特征的盐岩蠕变本构模型研究[J].岩土力学,2017,38(7):1 951-1 958.LIU Di,ZHOU Hongwei,ZHAO Yang,et al.Study of creep constitutive model of rock salt based on acoustic emission characteristics[J].Rock and Soil Mechanics,2017,38(7):1 951-1 958.
[11]吴祝林,王伟,朱鹏辉,等.基于Kachanov损伤理论的岩石蠕变模型研究[J].三峡大学学报(自然科学版),2016,38(3):32-35.WU Zhulin,WANG Wei,ZHU Penghui,et al.Research of creep model of rock based on Kachanov damage theory[J].Journal of China Three Gorges University(Natural Sciences),2016,38(3):32-35.
[2]刘清秉,王顺,夏冬生,等.残余强度状态下原状滑带土蠕变特性试验研究[J].岩土力学,2017,38(5):1 305-1 313.LIU Qingbing,WANG Shun,XIA Dongsheng,et al.Experimental study of residual-state creep behavior of intact sliding-zone soil[J].Rock and Soil Mechanics,2017,38(5):1 305-1 313.
[3]WEN Baoping,JIANG Xiuzi.Effect of gravel content on creep behavior of clayey soil at residual state:implication for its role in slow-moving landslides[J].Landslides,2017,14(2):559-576.
[4]孙淼军,唐辉明,王潇弘,等.蠕动型滑坡滑带土蠕变特性研究[J].岩土力学,2017,38(2):385-391,399.SUN Miaojun,TANG Huiming,WANG Xiaohong,et al.Creep properties of sliding-zone soil from a creeping landslide[J].Rock and Soil Mechanics,2017,38(2):385-391,399.
[5]辛鹏,吴树仁,石菊松,等.簸箕山大型老滑坡滑动带的结构特征及形成机制试验研究[J].岩石力学与工程学报,2013,32(7):1 382-1 391.XIN Peng,WU Shuren,SHI Jusong,et al.Sructural characteristics of soft-rock slip zone and experimental study of its formulation mechanism in Boji mountain large-scale old landslide[J].Chinese Journal Rock mechanics and Engineering,2013,32(7):1 382-1 391.
[6]李纯.基于滑带土流变特性的黄土坡滑坡长期变形及时变稳定性研究[D].武汉:中国地质大学,2018.LI Chun.Long-term deformation and time-varying stability of Huangtupo landslide based on the rheological property of slip zone soil[D].Wuhan:China University of Geosciences,2018.
[7]刘汉东,李梦姿,杨继红.非饱和滑带土非线性Burgers蠕变模型[J].华北水利水电大学学报(自然科学版),2017,38(2):43-48.LIU Handong,LI Mengzi,YANG Jihong.Nonlinear Burgers creep model for unsaturated soil in slipping zone[J].Journal of North China University of Water Resources&Electric Power,2017,38(2):43-48.
[8]王来贵,戴罡,赵国超,等.软岩蠕变过程稳定性及反馈特性[J].辽宁工程技术大学学报(自然科学版),2015,34(9):993-998.doi:10.11956/j.issn.1008-0562.2015.09.001.WANG Laigui,DAI Gang,ZHAO Guochao,et al.Stability and the feedback characteristics process of the soft rock[J].Journal of Liaoning Technical University(Natural Science),2015,34(9):993-998.doi:10.11956/j.issn.1008-0562.2015.09.001.
[9]张树光,王有涛,林晓楠.东梁煤矿非饱和砂岩黏弹塑性蠕变分析[J].辽宁工程技术大学学报(自然科学版),2017,36(2):127-131.doi:10.11956/j.issn.1008-0562.2017.02.003.ZHANG Shuguang,WANG Youtao,LIN Xiaonan.Analysis on visco-elastic-plastic creep of unsaturated sandstone of Dongliang coal mine[J].Journal of Liaoning Technical University(Natural Science),2017,36(2):127-131.doi:10.11956/j.issn.1008-0562.2017.02.003.
[10]刘迪,周宏伟,赵阳,等.基于声发射特征的盐岩蠕变本构模型研究[J].岩土力学,2017,38(7):1 951-1 958.LIU Di,ZHOU Hongwei,ZHAO Yang,et al.Study of creep constitutive model of rock salt based on acoustic emission characteristics[J].Rock and Soil Mechanics,2017,38(7):1 951-1 958.
[11]吴祝林,王伟,朱鹏辉,等.基于Kachanov损伤理论的岩石蠕变模型研究[J].三峡大学学报(自然科学版),2016,38(3):32-35.WU Zhulin,WANG Wei,ZHU Penghui,et al.Research of creep model of rock based on Kachanov damage theory[J].Journal of China Three Gorges University(Natural Sciences),2016,38(3):32-35.
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