红层滑坡滑带土经验型蠕变模型研究
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摘要
四川盆地及边缘广泛分布红层边坡,对人类生命财产带来巨大威胁。滑带土的蠕变特性直接关系到红层边坡的长期稳定性,采用CSS-2901TS土体三轴流变试验机进行三轴固结不排水压缩蠕变试验,以研究红层滑坡滑带土蠕变特性。针对蠕变试验成果,结合经验模型理论,通过双曲线函数描述应力-应变关系,并引入Log-Modified函数来描述应变-时间关系,建立一种新的经验型蠕变模型。利用ε/D-ε关系曲线和Levenberg-Marquardt算法及通用全局优化法求解模型参数。采用所建模型对蠕变曲线进行辨识,R2总体在0.97以上,克服了常规经验型蠕变模型难以辨识加速蠕变阶段的困难。经过验证,所建模型能准确地描述红层滑坡滑带土的蠕变特性。
Red bed slopes are widely distributed in Sichuan basin and its edge area,which brings great threat to human life and properties. Sliding soil creep is directly related to the long- term stability of the red bed slope. CSS- 2901 TS soil triaxial rheological test machine was applied to triaxial consolidated undrained triaxial compression creep test to study the creep characteristics of red bed slip soil. According to the results of creep test,and based on empirical model theory,the relationship of stress and strain is described by hyperbolic function,and the relationship of strain and time is described by Log- Modified function,so a new empirical creep model is established. The model parameters are calculated by using ε / D- ε curves,the Levenberg- Marquardt algorithm and the general global optimization method. The established model is used to identify the creep curves,and the correlation coefficients are above 0. 97. The new model improves conventional empirical creep models that are difficult to identify the creep acceleration stage. The verification shows that the model can accurately describe the creep characteristics of the red bed slip soil.
Red bed slopes are widely distributed in Sichuan basin and its edge area,which brings great threat to human life and properties. Sliding soil creep is directly related to the long- term stability of the red bed slope. CSS- 2901 TS soil triaxial rheological test machine was applied to triaxial consolidated undrained triaxial compression creep test to study the creep characteristics of red bed slip soil. According to the results of creep test,and based on empirical model theory,the relationship of stress and strain is described by hyperbolic function,and the relationship of strain and time is described by Log- Modified function,so a new empirical creep model is established. The model parameters are calculated by using ε / D- ε curves,the Levenberg- Marquardt algorithm and the general global optimization method. The established model is used to identify the creep curves,and the correlation coefficients are above 0. 97. The new model improves conventional empirical creep models that are difficult to identify the creep acceleration stage. The verification shows that the model can accurately describe the creep characteristics of the red bed slip soil.
引文
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[13]Yan-bo Zhu,Hong-ming Yu.An improved Mesri creep model for unsaturated weak intercalated soils[J].Journal of Central South University,2014,21(12):4677-4681.
[14]程强,寇小兵,黄绍槟,等.中国红层的分布及地质环境特征[J].工程地质学报,2004,12(1):34-40.
[15]Mesri G,Febres-Cordero E,Shields D R,et al.Shear stress-strain-time behaviour of clays[J].Geotechnique,1981,31(4):537-552.
[16]李军世,孙钧.上海淤泥质黏土的Mesri蠕变模型[J].土木工程学报,2001,34(6):74-79.
[2]Ming Zhang,Yue-ping Yin,Bo-lin Huang.Mechanisms of rainfall-induced landslides in gently inclined red beds in the eastern Sichuan Basin,SW China[J].Landslides,2015,12(5):973-983.
[3]李晓.滑带土组成特征及其成因意义[D].兰州:兰州大学,2010.
[4]Li D Y,Yin K L,Leo C.Analysis of Baishuihe landslide influenced by the effects of reservoir water and rainfall[J].Environmental Earth Sciences,2010,60(4):677-687.
[5]谭万鹏,郑颖人,王凯.考虑蠕变特性的滑坡稳定状态分析研究[J].岩土工程学报,2010(S2):5-8.
[6]Pytharouli S I,Stiros S C.Kinematics and rheology of a major landslide based on signal analysis[J].Geotechnique,2010,60(3):207-222.
[7]严绍军,项伟,唐辉明,等.大岩淌滑坡滑带土蠕变性质研究[J].岩土力学,2008,29(1):58-62+68.
[8]龙建辉,郭文斌,李萍,等.黄土滑坡滑带土的蠕变特性[J].岩土工程学报,2010(7):1023-1028.
[9]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.
[10]李佐良,许再良,杨爱武,等.德州松软土蠕变特性及其模型研究[J].工程地质学报,2013,21(6):967-972.
[11]卢萍珍,曾静,盛谦.软黏土蠕变试验及其经验模型研究[J].岩土力学,2008,29(4):1041-1044+1052.
[12]高洪梅,刘汉龙,刘金元,等.EPS颗粒轻质混合土的蠕变模型研究[J].岩土力学,2010,31(S2):198-205.
[13]Yan-bo Zhu,Hong-ming Yu.An improved Mesri creep model for unsaturated weak intercalated soils[J].Journal of Central South University,2014,21(12):4677-4681.
[14]程强,寇小兵,黄绍槟,等.中国红层的分布及地质环境特征[J].工程地质学报,2004,12(1):34-40.
[15]Mesri G,Febres-Cordero E,Shields D R,et al.Shear stress-strain-time behaviour of clays[J].Geotechnique,1981,31(4):537-552.
[16]李军世,孙钧.上海淤泥质黏土的Mesri蠕变模型[J].土木工程学报,2001,34(6):74-79.