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为深入认识高温冻土的松弛规律,查明预应变对松弛过程的影响,开展了一系列室内高温冻土松弛试验。研究发现,预应变过程明显影响了高温冻土的松弛过程,表现为预应变量增大,瞬时松弛量相应提高,松弛稳定历时延长;对于恒应变速率加载而言,恒应变速率增大延长了松弛稳定历时,并提高了高温冻土的松弛速率;对于恒应力率加载过程而言,恒应力率增大,松弛稳定历时延长,松弛速率也随之提高。偏应力与时间对数的关系具有明显的非线性特征,不能简单描述为单一直线,采用双曲线型关系描述其关系时效果很好,根据双曲线型获得了一种经验型的流变关系,并对该流变关系的可靠性进行了验证。
In order to deeply understand the relaxation rule of permafrost, find out the effect of pre-strain on the relaxation process, and carry out a series of indoor high temperature permafrost relaxation tests. It is found that the pre-strain process significantly affects the relaxation process of permafrost. The results show that the amount of pre-strain increases, the amount of instantaneous slack increases and the relaxation stability prolongs. For the constant strain rate loading, the constant strain rate increases Relaxation and stability lasted, and increased the high temperature permafrost relaxation rate; for the constant stress rate loading process, the constant stress rate increases, the relaxation stability lasted longer, the relaxation rate also increased. The relationship between deviatoric stress and logarithm of time has obvious non-linear characteristics and can not be described simply as a single straight line. The hyperbolic relationship is very effective in describing the relationship, and an empirical rheological relationship is obtained according to the hyperbola type. The reliability of this rheological relationship was also verified.