冻土卸载力学特性及其对冻胀力测试影响初探

Exploration of mechanics properies of frozen soil under unloading condition and their influences on frost force measurement

传统的冻土力学试验获得的是冻土在加载条件下的力学参数,而实际情况有时冻土是处在卸载状态下.实验表明:冻土在加载和卸载条件下的力学参数是不尽相同的,可以将采用应力解除法测量冻胀力的过程看成是一个卸载过程,卸载过程与加载过程的不同,卸载过程对冻土力学参数的影响,以及在进行冻胀力测量结果的计算时如何进行测量参数的选取是讨论的主要问题.

Mechanical parameters of frozen soil under stress can be gained by means of traditional mechanical tests of frozen soil.However,the frozen is often in a state of stress relief.Experiments have shown that mechanical parameters of the frozen soil under stress are different from that of the frozen soil in a state of stress relief.The process of measuring frost force by overcoring can be defined as a process of stress relief.The difference between stress relief process and loading process,the influence of overcoring process on mechanical parameters of the frozen soil and how to determine the parameters of frost force measurement in calculation of the result are mainly focused on.