TY - CONF A1 - Niederleithinger, Ernst ED - Matsumoto, T T1 - The parallel seismic method for foundation length measurement: useful also to check pile integrity? N2 - The Parallel Seismic (PS) method is used for the determination of the unknown or undocumented depth/length of foundations, mostly piles. The method was developed some decades ago and has recently been improved by more accurate Interpretation methods. Some authors claim that the PS method might also be useful for checking the integrity of piles. The examples presented are based on rather big flaws. Numerical studies have been carried out with more realistic geometries. A finite integration technique involving cylinder symmetry (CEFIT) was used. Necks and bulges of various sizes have been simulated and the results have been compiled. It can be seen that the PS results are in fact influenced by pile irregularities. But in reality these effects are at least partly superposed by other influences or may be mistaken for effects caused by soil layering. However, the PS results and any deviation of travel time curves from a “normal” shape can be used as a hint to perform detailed studies involving other methods. T2 - 9th International conference on testing and design methods for deep foundations CY - Kanazawa, Japan DA - 18.09.2012 KW - Parallel seismic KW - Bored piles KW - Integrity KW - Low strain testing PY - 2012 SN - 978-4-89010-597-7 SP - 217 EP - 222 AN - OPUS4-27336 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -