EXAMPLE OF MEASUREMENT FOR FROST HEAVING FORCE ACTING ON FULL-SCALE GROUND ANCHOR AND SOIL NAILING

Abstract

In snowy and cold regions such as Hokkaido, ground anchor and soil nailing are damaged by frost heaves, and their functions are considered to be degraded, which is a problem in maintenance. However, the relationship between the degree of frost heaving power and the time of action and damage has not been clarified. For this reason, a design method and a maintenance management method that consider frost heave prevention technology have not been established for slope structures. To understand the mechanism of damage caused by frost heave and to study the technology for countermeasures against frost heave, a full-scale test and construction were performed on the ground anchors and the soil nailing, and the applied load was measured. For ground anchors, we focus on the free length, introduced tension load, and the pressure receiving area, and for soil nailing, we focus on the length of the reinforcing material and the area of the pressure receiving plate. As a result of the measurement, the frost heaving force exceeding the design load was applied to the ground anchors, and the ground reinforcement soil works in the winter period. It was also found that the freezing depth could be reduced by covering the ground with continuous fiber-reinforced soil and rubber mat.