To make a structure readily applicable to many kinds of underground structures at low cost and to effectively prevent damage to underground structures caused by front heaving for enhanced durability by providing a plate-shaped reaction member below an underground structure and almost parallel to a frozen surface.
A sloping frame 1 constructed in, e.g. a cold district, is buried in the ground (unfrozen soil layer 3) at almost right angles, and a plate-shaped reaction member 7 is secured to its lower end in such a way as to be almost parallel to the ground surface 2 (i.e., frozen surface 5). The reaction member 7 receives reaction F' to frost heaving from the frozen surface 5 via the unfrozen soil layer 3 around the sloping frame 1 and also receives the weights of a frozen soil layer 4 and the unfrozen soil layer 3 on the reaction member 7, the reaction F' to frost heaving being transmitted to the sloping frame 1 via the reaction member 7. Thus, inside the sloping frame 1, a frost heaving force working on the sloping frame 1 from the frozen soil layer 4 is balanced with the reaction F' to frost heaving which works on the sloping frame 1 from the unfrozen soil layer 3 via the reaction member 7, so that the sloping frame 1 does not undergo frost heaving nor move within the unfrozen soil layer 3, with the result that it forms no cavity below the reaction member 7.
OKAMURA AKIHIKO
NAKAZAWA JUICHI
OTOBE AKIYOSHI
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