坑内弾性波反射法における探査精度に関する一考察

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  • A STUDY ON EXPLORATION ACCURACY OF TUNNEL SEISMIC PREDICTION METHOD
  • ジョウカク イシガキ ノ ジシンジ キョドウ ト ソノ アンテイセイ ニ オヨボス クリイシ ノ エイキョウ

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TSP (Tunnel Seismic Prediction) method is a kind of geophysical exploration method in tunnel, and it employs seismic wave refrections to explore fault fructure zones and giological boundaries ahead of tunnel working face. Some statisical examinations for accuracy of investigation were curried on using data which were measured in some tunnel construction sites. The distance between face and objects (ex. fault, intrusive rock or giological boundaries), the angle between objects and tunnel axis and condition of objects were discussed for cause of error on the method. The summary of the results is:<BR>1) In the ordinary giological condition, the error range is ±5m.<BR>2) Erorr range were influenced by the angle between objects and tunnel axis or condition of objects.<BR>3) It will be able to estimate the giological structure from patterns of wave reflection.

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