不同负温下冻结粉土的力学特性研究  

Study on Mechanical Properties of Frozen Silt at Different Negative Temperatures

作　　者：杨尚礼 赵嘉 YANG Shang-li;ZHAO Jia(Hebei Institute of Architecture and Civil Engineering,Zhangjiakou,Hebei 075000)

机构地区：[1]河北建筑工程学院土木工程学院,河北张家口075000

出　　处：《河北建筑工程学院学报》2021年第4期55-61,共7页Journal of Hebei Institute of Architecture and Civil Engineering

基　　金：河北建筑工程学院研究生创新基金项目(XY202106)。

摘　　要：通过负温三轴试验,研究温度对冻结粉土力学特性的影响,研究结果表明:随着温度下降,三轴峰值偏应力也在增加,二者呈现正相关关系,残余强度也在逐步上升:随着冻结温度的降低,试样内摩擦角及粘聚力均增长,温度的降低对粘聚力影响较大。提出不同冻结温度切线模量Etd,将模型预测出应力应变曲线与试验所得应力-应变曲线进行对比,发现邓肯-张模型能够很好地反映出高粉粒含量冻结土体的本构关系。Through the negative temperature triaxial test,the influence of temperature on the mechanical properties of frozen silt is studied in this paper.The results show that with the decrease of temperature,the triaxial peak deviatoric stress is also increasing,the two show a positive correlation,and the residual strength is also gradually increasing;With the decrease of freezing temperature,the internal friction angle and cohesion of the sample increase,and the decrease of temperature has a great influence on the cohesion.The tangent modulus ETD at different freezing temperatures is proposed,and the stress-strain curve predicted by the model is compared with the stress-strain curve obtained from the test.It is found that Duncan-chang model can well reflect the constitutive relationship of frozen soil with high silt content.

关 键 词：负温 三轴试验 邓肯-张模型 

分 类 号：TU445[建筑科学—岩土工程]