农业机械学报2018，Vol.49Issue(3)：287-294,8.DOI:10.6041/j.issn.1000-1298.2018.03.034
冻融对饱和渠基土物理力学性质的影响
Experiment on Effect of Freezing and Thawing on Physical and Mechanical Properties of Saturated Channel Foundation Soil
摘要
Abstract
Freezing-thawing effect is the main inducement for the damage of channel in cold region,and the different forms of damage caused by it have seriously restricted the grain production.To explore the influence of freeze-thaw on physical and mechanical properties of saturated silty clay,after 0 ～ 11 cycles for saturated soil in the low temperature environment simulation test chamber,indoor geotechnical engineering test was applied,and grey correlation degree was used to analyze the interaction effect of soil properties and the following conclusions were drawn:with the increase of freeze-thaw cycle times,the cohesive force of saturated soil was decreased gradually with the form of single exponential function and the internal friction angle was increased gradually.The effect of freeze-thaw on cohesion was obviously attenuated after initial freezing and thawing.With the increase of freezing and thawing cycles,the damage coefficient Kφ was in a logarithmic function form change and the KC was in an exponential function form change.The coefficient of thermal conductivity and average dry density was negatively correlated with freeze-thaw cycle times,whereas the average porosity rate and permeability coefficient were positively correlated with freeze-thaw cycle times.Compared with the freeze-thaw action,the average porosity rate had a greater influence on the cohesion force,thermal conductivity,average dry density and permeability coefficient.For a single specimen,the influence of physical properties on the change of mechanical properties was in a descending order of average porosity,average dry density,permeability coefficient and thermal conductivity.关键词
冻融/黏聚力/内摩擦角/渗透系数/孔隙率/干密度Key words
freeze-thaw/cohesion force/internal friction angle/permeability coefficient/porosity/dry density分类
农业科技引用本文复制引用
汪恩良,姜海强,付强,崔恩彤,解飞..冻融对饱和渠基土物理力学性质的影响[J].农业机械学报,2018,49(3):287-294,8.基金项目
国家自然科学基金项目(51541901)和黑龙江省应用技术研究与开发计划项目(GZ16B009) （51541901）
