Experiment on the mechanical properties of loess under triaxial compression at different freezing temperatures
Accurately grasping the mechanical properties of loess under different freezing temperatures is a prerequisite and necessary conditions for rational design and safe construction in the design process of artificial freezing method.By designing orthogonal test and statistical fitting,the triaxial compression mechanical properties of loess frozen soil samples at the shaft of Haicetan Coal Mine were studied under different freezing temperatures.The influence of freezing temperatures on the stress-strain curve of frozen loess was analyzed,and the changes in the cohesive force and internal friction angle of frozen soil un-der different freezing temperatures were compared.A prediction model based on the change of freezing temperature was pro-posed for the cohesive force and internal friction angle of loess foundation soil in the shaft during the freezing process.The results show that the freezing temperature has a significant impact on the triaxial compression mechanical properties of loess samples.The cohesion of loess samples is linearly correlated with the freezing temperature,increasing with the decrease of freezing temperature.The internal friction angle is exponentially related to the freezing temperature,increasing first with the decrease of freezing temperature and then stabilizing.
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