Interaction mechanism of deep-buried frozen soil wall and surrounding earth mass in excavation unloaded state
Abstract：Based on Mises yield criterion, rheological theory of frozen soils and Hooke' s law of deviatoric tensor of equivalent stress-equivalent strain, the analytical formula of stress field and displacement field of nonlinear viscoelasto- plastic frozen wall under the interaction of frozen wall and surrounding earth mass in unloaded state were derived. The formulas for load of frozen soil wall and contact stress were also obtained. The equation of the visco-plastic zone was al- so deduced and presented. Combined with engineering case,the developing of frozen soil' s load, contact stress,visco- plastic zone and radial displacement were analyzed. The results can be derived as below:① The load of frozen wall is less than the virgin horizontal earth pressure. ②The time that visco-plastic zone appears and extends to the external border of frozen wall is very short. ③ The change of radial displacement with time is more intense with lager visco- plastic zone. The visco-plastic deformation is the important reason that leads to the rupture of the frozen pipes. This an- alytical model can better reflect the nature of mechanical properties of frozen wall.
Keywords：unloaded statedeep-buried frozen wallviscoelasto-plasticinteractionrheological property of frozen soils
Publication Date：2012-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 1834-1840 )