非饱和原状土本构模型研究
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摘要
提出了反映外力和浸润2个扰动因素影响的耦合扰动变量的概念.根据复合材料均匀化理论的思想建立了适用于非饱和结构性土的本构模型,该模型中考虑了水的滞后性与土体变形的耦合作用及饱和度变化对结构性劣化的影响,同时给出了耦合扰动变量的演化方程.将本文模型的预测结果与已有的实验结果进行了对比,本文模型能较好地反映非饱和原状土结构性对土体力学性能的影响,即软化现象.
A new expression form of coupled disturbing variable for unsaturated soils is defined in this paper,in which both of disturbance factors that external force and wetting are reflected.Moreover,a new constitutive model of unsaturated natural soils is build up in accordance with homogenization theory for composites materials.In the model,the coupling of hydraulic hysteresis and stress-strain behavior in unsaturated natural soils and the influence of saturation change on soil structure degradation are considered,and the evolution equation of coupled disturbing variable is presented.Comparing the calculation results of the new model with the experimental results,it can be seen clearly that the new model is satisfactory in describing the influence of soil structure degradation on the mechanical properties of unsaturated natural soils that is strain-softening behaviour.
A new expression form of coupled disturbing variable for unsaturated soils is defined in this paper,in which both of disturbance factors that external force and wetting are reflected.Moreover,a new constitutive model of unsaturated natural soils is build up in accordance with homogenization theory for composites materials.In the model,the coupling of hydraulic hysteresis and stress-strain behavior in unsaturated natural soils and the influence of saturation change on soil structure degradation are considered,and the evolution equation of coupled disturbing variable is presented.Comparing the calculation results of the new model with the experimental results,it can be seen clearly that the new model is satisfactory in describing the influence of soil structure degradation on the mechanical properties of unsaturated natural soils that is strain-softening behaviour.
引文
[1]齐吉琳,谢定义,石玉成.土结构性的研究方法及现状[J].西北地震学报,2001,23(1):99-103.QI Ji-lin,XIE Ding-yi,SHI Yu-cheng.Status quo and method of quantitative study on soil structure[J].NorthwesternSeismological Journal,2001,23(1):99-103.(in Chinese)
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[9]沈珠江,陈铁林.岩土破损力学:结构类型与荷载分担[J].岩土力学与工程学报,2004,23(13):2137-2142.SHEN Zhu-jiang,CHEN Tie-lin.Breakage mechanics of geomaterial-structure types and load sharing[J].Chinese Journal ofRock Mechanics and Engineering,2004,23(13):2137-2142.(in Chinese)
[10]ALONSO E E,GENS A,JOSA A.A constitutive model for partially saturated soils[J].Geotechnique,1990,40(3):405-430.
[11]WHEELER S J,SHARMA R S,BUSSION M S R.Coupling of hydraulic hysteresis and stress-strain behavior in unsaturatedsoils[J].Geotechnique,2003,53(1):41-54.
[12]SUN D A,CUI H B,HAJIME M,et al.A Three-Dimensional elastoplastic model for unsaturated compacted soils withhydraulic hysteresis[J].Soils and Foundations,2007,47(2):253-264.
[13]金旭,赵成刚,刘艳,等.非饱和原状土的弹塑性损伤本构模型[J].北京交通大学学报,2010,34(1):78-82.JIN Xu,ZHAO Cheng-gang,LIU Yan,et al.An elasto-plastic damage constitutive model of unsaturated natural soils[J].Journal of Beijing Jiaotong University,2010,34(1):78-82.(in Chinese)
[14]沈珠江,刘恩龙,陈铁林.岩土二元介质模型的一般应力应变关系[J].岩土工程学报,2005,27(5):489-494.SHEN Zhu-jiang,LIU En-long,CHEN Tie-lin.Generalized stress-strain relationship of binary medium model for geologicalmaterials[J].Chinese Journal of Geotechnical Engineering,2005,27(5):489-494.(in Chinese)
[15]卢再华,陈正汉.非饱和原状膨胀土的弹塑性损伤本构模型研究[J].岩土工程学报,2003,25(4):422-426.LU Zai-hua,CHEN Zheng-han.An elastoplastic damage constitutive model of unsaturated undisturbed expansive soil[J].Chinese Journal of Geotechnical Engineering,2003,25(4):422-426.(in Chinese)
[2]龚晓南,熊传祥,项可祥,等.粘土结构性对其力学性质的影响及形成原因分析[J].水利学报,2000,10:43-47.GONG Xiao-nan,XIONG Chuan-xiang,XIANG Ke-xiang,et al.The formation of clay structure and its influence onmechanical characteristics of clay[J].Journal of Hydraulic Engineering,2000,10:43-47.(in Chinese)
[3]LEROUEIL S,VAUGHAN P R.The general and congruent effects of structure in natural soils and weak rocks[J].Geotechnique,1990,40(3):467-488.
[4]沈珠江.土体结构性的数学模型——21世纪土力学的核心问题[J].岩土工程学报,1996,18(1):95-97.SHEN Zhu-jiang.The mathematical model for the soil structure—the key problem in soil mechanics in the 21st Century[J].Chinese Journal of Geotechnical Engineering,1996,18(1):95-97.(in Chinese)
[5]谢定义,齐吉琳.土结构性及其定量化参数研究的新途径[J].岩土工程学报,1999,21(6):651-656.XIE Ding-yi,QI Ji-lin.Soil structure characteristics and new approach in research on its quantitative parameter[J].ChineseJournal of Geotechnical Engineering,1999,21(6):651-656.(in Chinese)
[6]BURLAND J B.On the compressibility and shear strength of natural clays[J].Geotechnique,1990,40(3):329-378.
[7]DESAI C S,YOUZHI M.Modeling of joints and interfaces using the disturbed-state concept[J].International Journal forNumerical and Analytical Methods in Geomechanics,1992,16:623-653.
[8]沈珠江.结构性粘土的弹塑性损伤模型[J].岩土工程学报.1993,15(3):21-28.SHEN Zhu-jiang.An elasto-plastic damage model for cemented clays[J].Chinese Journal of Geotechnical Engineering,1993,15(3):21-28.(in Chinese)
[9]沈珠江,陈铁林.岩土破损力学:结构类型与荷载分担[J].岩土力学与工程学报,2004,23(13):2137-2142.SHEN Zhu-jiang,CHEN Tie-lin.Breakage mechanics of geomaterial-structure types and load sharing[J].Chinese Journal ofRock Mechanics and Engineering,2004,23(13):2137-2142.(in Chinese)
[10]ALONSO E E,GENS A,JOSA A.A constitutive model for partially saturated soils[J].Geotechnique,1990,40(3):405-430.
[11]WHEELER S J,SHARMA R S,BUSSION M S R.Coupling of hydraulic hysteresis and stress-strain behavior in unsaturatedsoils[J].Geotechnique,2003,53(1):41-54.
[12]SUN D A,CUI H B,HAJIME M,et al.A Three-Dimensional elastoplastic model for unsaturated compacted soils withhydraulic hysteresis[J].Soils and Foundations,2007,47(2):253-264.
[13]金旭,赵成刚,刘艳,等.非饱和原状土的弹塑性损伤本构模型[J].北京交通大学学报,2010,34(1):78-82.JIN Xu,ZHAO Cheng-gang,LIU Yan,et al.An elasto-plastic damage constitutive model of unsaturated natural soils[J].Journal of Beijing Jiaotong University,2010,34(1):78-82.(in Chinese)
[14]沈珠江,刘恩龙,陈铁林.岩土二元介质模型的一般应力应变关系[J].岩土工程学报,2005,27(5):489-494.SHEN Zhu-jiang,LIU En-long,CHEN Tie-lin.Generalized stress-strain relationship of binary medium model for geologicalmaterials[J].Chinese Journal of Geotechnical Engineering,2005,27(5):489-494.(in Chinese)
[15]卢再华,陈正汉.非饱和原状膨胀土的弹塑性损伤本构模型研究[J].岩土工程学报,2003,25(4):422-426.LU Zai-hua,CHEN Zheng-han.An elastoplastic damage constitutive model of unsaturated undisturbed expansive soil[J].Chinese Journal of Geotechnical Engineering,2003,25(4):422-426.(in Chinese)
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