坑内弾性波反射法を用いた岩盤評価の試み

抄録

Elastic wave velocity is useful parameter for rock mass classification, and seismic exploration in tunnel have been applied for rock classification around the tunnel face or wall. TSP method is an exploration technique to predict fault or geological boundary at ahead of tunnel face, and i is able to measure elastic wave velocity around the tunnel.
It was compared elastic wave velocity (Vpt) which measured by TSP with that obtained conventional method, in this study. And it was investigated the relationship between Vpt and rock strength, fissure and thrust power of TBM.
The summary of the result is;
1) It was not clear relation Vpt and rock strength, RMR, but recognized some correlation Vpt and thrust power.
2) The ratio of Vpt to velocity measured tunnel wall is useful to evaluate the stability of tunnel support.