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A simple and highly accurate measuring technique is discussed to determine the complete distribution of strain along boreholes both in the rock foundation and in the concrete structure. For this purpose the portable Sliding Micrometer probe is applied which measures the strain with a base length of 1.00 m between consecutive points along a casing. The boreholes may be oriented arbitrarly in space and their length may exceed 100 m. The detailed knowledge of strain development is crucial when causes of unexpected dam behavior have to be elucidated. Measuring results from large scale applications at the Albigna gravity dam (Switzerland) and at the Kolnbrein Arch dam (Austria) are discussed in detail.
Index Terms:rock; TunnelingGroup
Further Information:Date published: 1985