岩土力学2017，Vol.38Issue(6)：1675-1681,7.DOI:10.16285/j.rsm.2017.06.016
三轴循环加卸载条件下高含冰冻结砂土变形特性试验研究
Experimental investigation on deformation characteristics of ice-rich frozen silty sands under triaxial loading-unloading cycle
摘要
Abstract
Energy dissipation and shear modulus variation of ice-rich frozen silty sand with different water contents are investigated in a comprehensive experimental program of triaxial loading-unloading cyclic tests under various confining pressures at the same temperature and strain rate conditions.The results show that the plasticity of frozen silty sand firstly increases and then decreases as the water content increases.The frozen soil p~sents mostly plastic failure mode with a water content threshold of 30.6％.The energy dissipation as shear strain increases is mainly induced by deviator stress variation,and less energy dissipation overcomes the effect between ice particles in the deformation process of frozen soil.Shear modulus always decreases as shear strain increases.The decreasing rate of shear modulus has an apparent change point at low water content..Three types of effects of water content on shear modulus can be observed.These testing results can provide important implications for the parameter selection on engineering design in permafrost region with ice-rich soil.关键词
三轴循环加卸载/高含冰量冻结砂土/围压/含水率/能量耗散/剪切模量Key words
triaxial loading-unloading cycle/ice-rich frozen silty sand/confining pressure/water content/energy dissipation/shear modulus分类
建筑与水利引用本文复制引用
杜海民,马巍,张淑娟,周志伟..三轴循环加卸载条件下高含冰冻结砂土变形特性试验研究[J].岩土力学,2017,38(6):1675-1681,7.基金项目
国家重点基础研究发展计划(973)项目(No.2012CB026106):冻土工程国家重点实验室自主课题(No.SKLFSE-ZT-07) （973）
冻土工程国家重点实验室开放基金(No.SKLFSE201605).This work was supported by the National Program on Key Basic Research Project of China (973 Program) (2012CB026106),the Independent Program for State Key Laboratory of Frozen Soil Engineering (SKLFSE-ZT-07) and the Open Project Program of the State Key Laboratory of Frozen Soil Engineering (SKLFSE201605). （No.SKLFSE201605）
