【作者】 刘元雪； 施建勇；

【Author】 Liu Yuanxue;Shi Jianyong Geotechnical Institrte, Hohai University, Nanjing 210098 China Department of Civil Engineerign, Logistical Engineering University, Chongqing 400041 China

【机构】 河海大学岩土工程研究所；

【摘要】 从土体极限应力状态线所致的各向异性出发,结合原状土的力学特性,给出了原状土的应力空间、应力增量变换公式。在变换应力空间,屈服面、边界面只能在允许的应力空间中运动(等向硬化或运动硬化),更合理地反映了岩土体次生各向异性与应力路径的影响,为原状土本构描述提供了一条新途径。在应力空间变换基础上,借助边界面与损伤的思想建立了一个可以反映原状软土从小应变到大应变力学特性的本构模型,与有关试验结果对比表明本模型是合理的。更多还原

【Abstract】 Based on the anisotropy induced by the critical state line,the idea of transformation of stress space is presented. Combined with themechanical characteristics of natural soils,the formulas of transformation of stress space and stress increment are provided, and the influene ofstress Lode’s angle is considered also. The motion of yield surface and bounding surface (isotropic hardening or kinematic hardeing) is limit-ed in the allowable stress space,the stress-induced anisotropy, and the influence of stress path can be considered more reasonably in the trans-formed stress space. A new path is provided for constitutive description of natural soils. Based on the transformation of stress space, boundarysurface theory,and damage theory, a new constitutive model which can simulate the mechanical behavior of natural soils from small strain tolarge strain is provided.The comparison of the prediction of this model and the relevant experimental results verify that this new model is rea-sonable.更多还原