摘要
为了揭示短时冻土区冻融作用对残积土力学性质的损伤规律,对经历不同冻融条件的压实成型重塑三轴试样进行了不固结不排水的三轴剪切试验。试验结果表明:经历多次冻融循环作用后,残积土试样的应力-应变关系呈软化趋势,且在经历5次冻融循环作用后趋向于稳定状态;试样经历冻融作用后,弹性模量、黏聚力及内摩擦角均发生损伤且损伤幅度均随着冷端温度的升高、含水率的增大、冻融循环次数的增加而增大;土体黏聚力损伤程度最大,弹性模量其次,内摩擦角损伤程度最小;建立的考虑冷端温度、含水率及冻融循环次数影响的弹性模量、黏聚力及内摩擦角非线性损伤模型与试验数据结果吻合良好。
In order to reveal the damage regular influence of freezing-thawing cycles on mechanical properties of residual soil in short-term frozen area, unconsolidated-undrained test are carried out on remolded samples under different freezing and thawing experimental condition. The test results indicate that the stress-strain relationship of residual samples display a softening phenomenon after five cycles of freezing-thawing. The damage ranges of elasticity modulus, cohesion and internal friction angle of the freezing-thawing samples increase with the rise of the negative temperature, the increase of moisture content and the number of freezing-thawing cycle. The damage degree of samples is order of e!asticity modulus, cohesion and internal friction angle. The predicted results of the non-linear damage model of elasticity modulus, cohesion and internal friction angle, in which the moisture content, negative temperature, the number of freezing-thawing cycle are considered, are in good agreement with the experimental data.
出处
《公路》
北大核心
2016年第7期1-7,共7页
Highway
基金
国家自然科学基金资助项目
项目编号41302215
福建省自然科学基金资助项目
项目编号2014501185
福州大学科技发展基金资助项目
项目编号2013-XQ-39
关键词
短时冻土
冻融循环
残积土
弹性模量
抗剪强度指标
short-term frozen soil freezing-thawing cycle residual soil elasticity modulus shear strength index
