| 摘要 |
The invention relates to a method for monitoring the condition of a ground anchorage (2) in a bore in a ground formation (i) at a site, which method comprises: securing a means for monitoring frequency response spectra (10) to said ground anchorage, applying to said ground anchorage an impulse load (11) of a predetermined value, recording th e signature of the frequency response spectra, and comparing said signature with a reference signature from the site, thereby to obtain a n indication of the integrity of the ground anchorage in the formation.
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