Abstract: In the light of the functional relationship between freezing temperature and elastic modulus E and cohesion c and by the aid of the trapezoid-parabola equivalent temperature field model, the analytical expressions of stress in elastic and plastic zones of triple-row-piped heterogeneous frozen soil wall were derived based on the assumption that the frozen wall is a thick cylinder with its material properties varying in segmented function along radial direction. The relationship between the bearing capacity of frozen wall and the relative radius of plastic zone was also given. Such calculation theories were applied to the mechanical property analysis for a frozen soil wall in a mine area of Huainan City. Results unveiled that the radial stress of the heterogeneous triple-row-piped frozen soil wall increased with the expansion of relative radius r, while circumferential stress in the Ⅰ, Ⅱ and Ⅲ intervals changed in different laws. Calculation results also demonstrated that the elastic ultimate bearing capacity of homogeneous frozen soil wall was too large, which is risky in design. Therefore, the calculation result of heterogeneous frozen soil wall was more consistent with the actual stress condition of frozen wall. The research findings offer important theoretical reference for the design of multi-row freezing in deep alluvium.

Key words: triple-row-piped heterogeneous frozen soil wall, triple-row-piped homogeneous frozen soil wall, trapezoid-parabola equivalent temperature field, ultimate elastic bearing capacity, elastic and plastic analysis