考虑系数非定常性的成都黏土非线性蠕变本构模型
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摘要
为了研究成都黏土蠕变规律,展开固结不排水三轴蠕变试验,分析了成都黏土变形的非线性特性及参数的非定常特性。结果表明:当应力小于黏土屈服强度时,蠕变以线性变形为主,包括瞬时弹性变形和黏弹性变形;当应力大于屈服强度时,蠕变以非线性变形为主,包括黏弹塑性变形,具有显著的非线性特性;蠕变过程中,黏土的弹性模量和黏滞系数均为应力和时间的函数,具有显著的非定常特性。结合元件模型理论和分数阶导数模型理论的优点,构建了考虑弹性模量和黏滞系数非定常特性的成都黏土非线性蠕变本构模型,并对模型进行了拟合验证分析,发现蠕变模型对蠕变各阶段的拟合度较高,充分发挥了元件模型和分数阶导数模型的优点,可以很好地反映成都黏土的蠕变全过程。
In order to study the creep law of Chengdu Clay,consolidate the undrained triaxial creep test are completed. The nonlinear characteristics of Chengdu clay deformation are analyzed,and the unsteady characteristics of parameters are also analyzed. The results show that,when the stress is less than the yield strength of the clay,the creep is dominated by linear deformation,it includes transient elastic deformation and viscoelastic deformation. When the stress is greater than the yield strength,the creep is dominated by nonlinear deformation,it includes viscoelastic deformation and has significant nonlinear properties. During the creep process,the elastic modulus and viscous coefficient of clay are both a function of stress and time,and they have significant unsteady characteristics. Combining the advantages of component model theory and fractional derivative model theory,a nonlinear creep constitutive model of Chengdu clay considering the unsteady characteristics of elastic modulus and viscous coefficient is constructed. The model is fitted to the validation analysis,it is found that the creep model has a high degree of fitting to each stage of creep,and the advantages of the component model and the fractional derivative model are fully reflected,and the whole process of creeping of Chengdu clay can be well reflected.
In order to study the creep law of Chengdu Clay,consolidate the undrained triaxial creep test are completed. The nonlinear characteristics of Chengdu clay deformation are analyzed,and the unsteady characteristics of parameters are also analyzed. The results show that,when the stress is less than the yield strength of the clay,the creep is dominated by linear deformation,it includes transient elastic deformation and viscoelastic deformation. When the stress is greater than the yield strength,the creep is dominated by nonlinear deformation,it includes viscoelastic deformation and has significant nonlinear properties. During the creep process,the elastic modulus and viscous coefficient of clay are both a function of stress and time,and they have significant unsteady characteristics. Combining the advantages of component model theory and fractional derivative model theory,a nonlinear creep constitutive model of Chengdu clay considering the unsteady characteristics of elastic modulus and viscous coefficient is constructed. The model is fitted to the validation analysis,it is found that the creep model has a high degree of fitting to each stage of creep,and the advantages of the component model and the fractional derivative model are fully reflected,and the whole process of creeping of Chengdu clay can be well reflected.
引文
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10 夏才初,王晓东,许崇帮,等.用统一流变力学模型理论辨识流变模型的方法和实例[J].岩石力学与工程学报,2008,27(8):1594-1600Xia Caichu,Wang Xiaodong,Xu Chongbang,et al. Method to identify rheological models by unified rheological model theory and case study method to identify rheological models by unified rheological model theory and case study[J]. Chinese Journal of Rock Mechanics and Engineering,2008,27(8):1594-1600
11 王者超,乔丽苹,李术才,等.土的内变量蠕变模型研究[J].岩土工程学报,2011,33(10):1569-1575Wang Zhechao,Qiao Liping,Li Shucai,et al. An internal-variable creep model for soils[J]. Chinese Journal of Geotechnical Engineering,2011,33(10):1569-1575
12 陈棠茵.成都东郊台地晚更新世Q32黏土成因分析[J].西北地质,2014,47(2):132-137Chen Tangyin. Origin analysis of the late pleistocene Q32clay on eastern suburb platform of chengdu[J]. Northwestern Geology,2014,47(2):132-137
13 罗筱青.成都粘土的工程地质特性及其评价[J].地质灾害与环境保护,1999,10(2):60-62Luo Xiaoqing. The geo-engineering properties and evaluation of Chengdu clay[J]. Journal of Geological Hazards and Environment Preservation,1999,10(2):60-62
14 赵锡宏,孙红,罗冠威.损伤土力学[M].上海:同济大学出版社,2000Zhao Xihong,Sun Hong,Kwang Weilo. Damage soil mechanics[M]. Shanghai:Tong Ji University Press,2000
15 孙钧.岩土材料流变及其工程应用[M].北京:中国建筑工业出版社,1999Sun Jun. Rheology of geo-material and its engineering application[M]. Beijing:China Architecture and Building Press,1999
16 张晓超,郑海军.成都黏土蠕变试验及其蠕变模型研究[J].实验技术与管理,2010,27(10):52-55Zhang Xiaochao,Zheng Haijun. Creep tests on Chengdu clay and its creep models[J]. Experimental Technology And Management,2010,27(10):52-55
2 薛凯喜,刘帅,刘晓东,等.黏土岩物理、力学及其工程特性研究[J].科学技术与工程,2016,16(16):110-121Xue Kaixi,Liu Shuai,Liu Xiaodong,et al. Review of the physical,mechanical and engineering properties of clay rocks[J]. Science Technology and Engineering,2016,16(16):110-121
3 尹振宇,朱启银,朱俊高.软黏土蠕变特性试验研究:回顾与发展[J].岩土力学,2013,34(增刊2):1-17Yin Zhenyu,Zhu Qiyin,Zhu Jungao. Experimental investigation on creep behavior of soft clays:Review and development[J]. Rock and Soil Mechanics,2013,34(S2):1-17
4 安淑红,朱俊高.土体的流变性研究进展[J].山东农业大学学报(自然科学版),2012,43(1):155-158An Shuhong,Zhu Jungao. Rheological properties of soil:A review[J]. Journal of Shandong Agricultural University(Natural Science),2012,43(1):155-158
5 李孝平,李显平.土的流变特性研究概述[J].灾害与防治工程,2007(1):35-40Li Xiaoping,Li Xianping. General study on rheological characters of soil[J]. Disaster and Control Engineering,2007(1):35-40
6 朱启银.软黏土的流变特性及流变参数统一性研究[D].上海:上海交通大学,2014Zhu Qiyin. Time-dependent behavior and uniqueness of its key parameters for soft clays[D]. Shanghai:Shanghai Jiao Tong University,2014
7 罗庆姿.黏滞性软土的流变特性及非线性模型研究[D].广州:暨南大学,2015Luo Qinzhi. Research on rheological characteristics and non-linear model of soft soil[D]. Guangzhou:Jinan University,2015
8 李锐铎,乐金朝,冯师蓉,等.沥青胶砂改进分数阶导数幂函数经验蠕变本构模型[J].建筑材料学报,2015,18(2):237-242Li Ruiduo,Yue Jinchao,Feng Shirong,et al. Improved fractional order derivative empirical power function model for describing the creep of asphalt mortar[J]. Journal of Building Materials,2015,18(2):237-242
9 王永岩,张金龙,张余标.单裂隙类岩石强度特性及蠕变模型的实验研究[J].科学技术与工程,2018,18(18):94-100Wang Yongyan,Zhang Jinlong,Zhang Yubiao. The experimental investigation of single fracture rock strength characteristics and creep model by experiment[J]. Science Technology and Engineering,2018,18(18):94-100
10 夏才初,王晓东,许崇帮,等.用统一流变力学模型理论辨识流变模型的方法和实例[J].岩石力学与工程学报,2008,27(8):1594-1600Xia Caichu,Wang Xiaodong,Xu Chongbang,et al. Method to identify rheological models by unified rheological model theory and case study method to identify rheological models by unified rheological model theory and case study[J]. Chinese Journal of Rock Mechanics and Engineering,2008,27(8):1594-1600
11 王者超,乔丽苹,李术才,等.土的内变量蠕变模型研究[J].岩土工程学报,2011,33(10):1569-1575Wang Zhechao,Qiao Liping,Li Shucai,et al. An internal-variable creep model for soils[J]. Chinese Journal of Geotechnical Engineering,2011,33(10):1569-1575
12 陈棠茵.成都东郊台地晚更新世Q32黏土成因分析[J].西北地质,2014,47(2):132-137Chen Tangyin. Origin analysis of the late pleistocene Q32clay on eastern suburb platform of chengdu[J]. Northwestern Geology,2014,47(2):132-137
13 罗筱青.成都粘土的工程地质特性及其评价[J].地质灾害与环境保护,1999,10(2):60-62Luo Xiaoqing. The geo-engineering properties and evaluation of Chengdu clay[J]. Journal of Geological Hazards and Environment Preservation,1999,10(2):60-62
14 赵锡宏,孙红,罗冠威.损伤土力学[M].上海:同济大学出版社,2000Zhao Xihong,Sun Hong,Kwang Weilo. Damage soil mechanics[M]. Shanghai:Tong Ji University Press,2000
15 孙钧.岩土材料流变及其工程应用[M].北京:中国建筑工业出版社,1999Sun Jun. Rheology of geo-material and its engineering application[M]. Beijing:China Architecture and Building Press,1999
16 张晓超,郑海军.成都黏土蠕变试验及其蠕变模型研究[J].实验技术与管理,2010,27(10):52-55Zhang Xiaochao,Zheng Haijun. Creep tests on Chengdu clay and its creep models[J]. Experimental Technology And Management,2010,27(10):52-55