Abstract
It is important to evaluate degree of improvement made by injecting the grouting material. The authors have proposed two techniques to evaluate the grouting effect. One is AE monitoring during grouting operation to clarify a range where the grouting material has permeated into. The other is measurement of P-wave amplitude transmitted between holes before and after grouting. Through the second technique, it can be confirmed that fractures necessary to be improved has been filled with the grouting material. By combining the two techniques, degree of improvement made by grouting can be evaluated with much better reliability than by conventional techniques. In this paper, applicability and reliability of the techniques are discussed through laboratory and in situ experiments.
