EVALUATION OF FLUCTUATIONS IN GROUND ANCHOR TENSILE FORCE CONSIDERING INFLUENCE OF TEMPERATURE

Abstract

 There are various types of instruments to measure the tensile force of ground anchors (hereinafter anchors). In general, the strain-gauge type load meter which substitutes the resistance change of the strain gauge with electric signals to measure the tensile force is used. But affected by thermal expansion and contraction of the strain gauge itself, caused by temperature change, the measurements of the strain-gauge type load meter fluctuate even when external force is not acting on the anchors. The characteristics indicated by the temperature and load meter’s measurements may be used to evaluate the stability of a slope. And the state of the anchor’s tensile force is judged by the changes in the tensile force’s percentage to the designed anchor force. But no definite evaluation method for tensile force that fluctuates continuously due to temperature change has been established. In this paper, we focus on the correlation between the temperature and measured value of the load meter, and evaluate the fluctuations in the tensile force of anchors considering the influence of temperature change.