文章摘要
李刚,张金利,杨庆,蒋明镜.海陆交互相黏性土蠕变试验与经验模型研究[J].,2018,58(1):64-71
海陆交互相黏性土蠕变试验与经验模型研究
Creep test and empirical model study of marine-terrestrial interactive clayey soils
  
DOI:10.7511/dllgxb201801010
中文关键词: 海陆交互相  蠕变试验  经验模型  黏性土  Mesri模型
英文关键词: marine-terrestrial interactive  creep test  empirical model  clayey soils  Mesri model
基金项目:国家自然科学基金资助项目(41572252).
作者单位
李刚,张金利,杨庆,蒋明镜  
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中文摘要:
      海陆交互相沉积土是在复杂的沉积环境下形成的,其力学性质与其他沉积土有所区别.针对大连海陆交互相黏性土原状样,采用三轴排水蠕变试验对黏性土的蠕变特性进行了研究,分析了轴向应变、体应变、轴向应变速率与蠕变时间、偏应力间的关系.基于蠕变试验结果,耦合Mesri模型与三次多项式,建立了可以描述土体衰减蠕变与加速蠕变过程的经验模型.结果表明,该地区土体具有典型的非线性蠕变特性,随着偏应力的增加,非线性蠕变特性愈加明显.在低偏应力作用下,蠕变过程表现出衰减蠕变与剪缩特性;在破坏偏应力下表现出加速蠕变与剪缩、剪胀交替特性.轴向应变速率随着蠕变时间的增加而减小,随着偏应力的增大而增大,而偏应力对m值(曲线斜率)的影响较小.试验结果与模型计算结果吻合较好,表明新建模型适用于描述该地区海陆交互相黏性土的蠕变特性.
英文摘要:
      The marine-terrestrial interactive deposit soils are formed in the complex depositional environment, its mechanical properties are different from the other deposits. The creep behaviors of Dalian marine-terrestrial interactive clayey soils are studied according to drained triaxial creep tests, and the relations between axial strain, volume strain, axial strain rate and creep time, deviatoric stress are analyzed. Based on the creep test results, the empirical model is established to describe the attenuation and acceleration creep process, which coupling Mesri model and cubic polynomial model. The results show that, Dalian clayey soils have the typical nonlinear creep behavior, and the nonlinearity is more obvious with the increasing of deviatoric stress. Under low deviatoric stress, the creep processes show the characteristic of attenuation creep and shear shrinkage. However, it shows the characteristic of acceleration creep, shear shrinkage and shear dilatancy under damage deviatoric stress. The axial strain rate decreases with the increasing of creep time, and increases with the deviatoric stress increasing, while the deviatoric stress has little effect on the m values (slope). The test results agree well with calculation results, which shows that the empirical model can describe the creep behaviors of marine-terrestrial interactive clayey soil in this area.
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