关键词: 黏土冻结壁, 冻土流变理论, 开挖卸载, 有限段高

Abstract: The design theory of frozen wall is the key of artificially ground freezing construction. The conventional elastic-plastic mechanical models are not suitable for frozen wall design in deep alluvium. Considering the effect of excavation length and the interaction between the frozen soil wall and its surrounding earth mass, the calculation models of deformation and thickness of finite-length frozen soil wall are developed based on the rheological theory of frozen soil and Hooke’s law of deviatoric tensor of equivalent stress-equivalent strain under tri-axial stress state. Combined with a shaft freezing engineering case, the influences of excavation length and duration of exposure on the calculation models are discussed. The results show that the reasonable construction speed is crucial to the safety of artificial freezing shaft sinking project. The analytical models have important theory meaning to the design theory of frozen wall in deep-buried clay layer.