Abstract Based on unified strength theory and a mechanical model of the interaction between a frozen soil wall and the surrounding soil mass in an unloaded state, the stress and displacement fields of the elastic zone and plastic zone, as well as the unified solutions of the elastic limit external load, plastic limit external load and external load in the elastic-plastic state, are derived considering the intermediate principal stress. The laws of how the stress field and displacement field vary with the radius and the parameters of strength theory are analyzed. The effects of the radius ratio, the parameters of unified strength theory and the calculation depth of the frozen soil wall on the unified solutions are discussed. The results show that:1) the radius and parameter of the unified strength theory have certain influence on the stress and displacement fields, and the calculation results are more accurate when they take the intermediate principal stress into consideration ; 2) the elastic limit external load and the plastic limit external load increase with an increase of the radius ratio and the parameters of the unified strength theory; 3) the external load in the elastic-plastic state decreases with an increase of the depth of the frozen soil wall and increases with an increase of the parameters of the unified strength theory; and 4) the external load on the frozen soil wall is lower than the original horizontal stress because of the interaction between the frozen soil wall and the surrounding soil mass in an unloaded state.
Abstract：
Based on unified strength theory and a mechanical model of the interaction between a frozen soil wall and the surrounding soil mass in an unloaded state, the stress and displacement fields of the elastic zone and plastic zone, as well as the unified solutions of the elastic limit external load, plastic limit external load and external load in the elastic-plastic state, are derived considering the intermediate principal stress. The laws of how the stress field and displacement field vary with the radius and the parameters of strength theory are analyzed. The effects of the radius ratio, the parameters of unified strength theory and the calculation depth of the frozen soil wall on the unified solutions are discussed. The results show that:1) the radius and parameter of the unified strength theory have certain influence on the stress and displacement fields, and the calculation results are more accurate when they take the intermediate principal stress into consideration ; 2) the elastic limit external load and the plastic limit external load increase with an increase of the radius ratio and the parameters of the unified strength theory; 3) the external load in the elastic-plastic state decreases with an increase of the depth of the frozen soil wall and increases with an increase of the parameters of the unified strength theory; and 4) the external load on the frozen soil wall is lower than the original horizontal stress because of the interaction between the frozen soil wall and the surrounding soil mass in an unloaded state.
2017, Vol. 54 