CHARACTERIZATION OF LOAD-DISPLACEMENT CURVE DERIVED FROM LIFT-OFF TESTS OF GROUND ANCHOR

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  • グラウンドアンカーのリフトオフ試験から求めた荷重－変位曲線の特性評価

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 Since a major portion of ground anchors (hereinafter anchor) installed on slopes is embedded in the ground, it is difficult to directly check tension members. Although lift-off tests of anchors are generally carried out to confirm the residual tensile force, the load-displacement curve derived from the tests could be a clue to estimating the condition of the anchor. However, there are still many factors that need to be clarified; for instance, tensile load applied to anchors using hydraulic jacks show a different transmitting status depending on how the anchor body is fixed, and the shape of the graph is influenced by the method used to fix the anchor head. This study assesses the characteristics of the load-displacement curve by analyzing the results of lift-off tests using a full-size test anchor.

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