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《Journal of Glaciology and Geocryology》 2018-02
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Sensitivity analysis of the factors affecting the volumetric deformation of frozen sandy soil

GAO Juan;LIAO Mengke;CHANG Dan;BAI Ruiqiang;State Key Laboratory of Frozen Soil Engineering,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences;University of Chinese Academy of Sciences;Economic and Technological Research Institute,State Grid Electric Power of Xingjiang;Beijing Jiaotong University;  
In order to analyze the sensitivity of the factors affecting volumetric strain of frozen sandy soil,six internal and external affecting factors have been selected in this paper. According to the method of orthogonal experiment design,using the sandy soil from Delingha of Qinghai Province,a number of triaxial compression tests were conducted. The results were analyzed by using the grey relational analysis(GRA),the magnitude of the sensitivity of all the selected influencing factors and the sequence of them was given. The results showed that the sensitivity of water content,loading rate and temperature are more than 70%,so these factors need to be considered during the later experiments. With small water content,the volumetric strain of frozen sandy soil shows contraction first and then expansion; the axial strains corresponding to the peak stress and the peak strain are basically the same,while in saturated condition,the volumetric strain only shows volume expansion; the major influence of loading rate on frozen sandy soil was the change of the mechanical properties and failure forms. With the increase of loading rate,the amount of volumetric strain decreases,tangent modulus and peak strength increase,while the peak strain shows a decreasing tendency,the properties of frozen sandy soil approach brittleness. When temperature decreases,the cohesive force between particles increases and the pore pressure transforms into effective stress,which will increase strength and volume expansion. The results of this paper will be useful for optimal design of laboratory test and engineering application.
【Fund】: 国家自然科学基金项目(41230630;41701068);; 中国科学院前沿科学重点研究计划项目(QYZDY-SSW-DQC015)资助
【CateGory Index】: TU445
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