Stress relaxation of warm frozen soil under drained or undrained conditions

• 作 者: SongHe Wang JiLin Qi
• 机 构: State Key Laboratory of Frozen Soil Engineering
• 出 处: 寒旱区科学（英文版）
• 发表日期: 2004年期
• 关键词: warm frozen soil stress relaxation confining pressure drained and undrained cond
• 基金项目: the 100 Young Talents Project granted to Dr.JiLin Qi;国家自然科学基金

To investigate the influence of drainage conditions on stress relaxation characteristics of warm frozen soil,a series of laboratory tests were carried out under drained and undrained conditions.The results indicate that confining pressure obviously influences the relaxation process of warm frozen soil.Under undrained condition,with increase in confining pressure,the critical relaxation duration tends to grow as well as instantaneous relaxation.But the relaxation rate is sensitive to confining pressure in the initial stage,and with further development,the effect tends to diminish.Under drained condition,the relaxation rate is greater than that under undrained condition in the initial stage but with the development of relaxation,the difference decreases.The volumetric deformation of warm frozen clay under drained condition is much larger than that under undrained condition.