High polymer cementitious Gobi soil is made by mixing high polymer with Gobi soil in a certain ratio,which can effectively improve the mechanical properties of Gobi soil.In order to study the dynamic residual deformation characteristics of high polymer cementitious Gobi soils,the effects of high polymer mass ratio,surrounding pressure,consolidation ratio and dynamic stress ratio on the residual shear strain and residual body strain of high polymer cementitious Gobi soils were investigated in this paper using medium-sized dynamic triaxial tests.The results show that the high polymer cementitious materials can effectively reduce the dynamic residual deformation of Gobi soil,and the residual shear strain of polymer cementitious Gobi soil after 30 cycles of loading is 15.0%～18.8%of that of natural Gobi soil,and the residual body strain is 12.1%～22.2%of that of natural Gobi soil.The reduction of residual shear strain was 85.0%and 95.2%,and the reduction of residual body strain was 87.9%and 95.5%for 3%and 12%of high polymer mass ratio.The larger the high polymer mass ratio,the larger the reduction.Projection pursuit regression(PPR)was used to analyze the influence weights of each influence factor on the residual deformation,and the influence weights of the dynamic residual shear strain and residual body strain of the polymer cementitious Gobi soil were obtained as high polymer mass ratio to peritectic dynamic stress ratio to consolidation ratio.An exponential function was used to fit the relationship between residual deformation and vibration times of polymer cementitious Gobi soil,and a modified residual deformation model of high polymer cementitious Gobi soil was established,which can respond to the effect of high polymer mass ratio.
关键词
高聚物胶凝戈壁土/动三轴试验/残余剪应变/残余体应变/投影寻踪回归分析/残余变形模型
Key words
high polymer cementitious Gobi soil/dynamic triaxial test/residual shear strain/residual body strain/projection pursuit regression/residual deformation model
维普
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