EVALUATION FOR THE CHARACTERISTICS OF ROCK GROUTING BY ACOUSTIC EMISSION ENERGY

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  • 岩盤基礎グラウト注入特性のAEエネルギーによる評価
  • ガンバン キソ グラウト チュウニュウ トクセイ ノ AE エネルギー ニ ヨ

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Abstract

Acoustic emission (AE) characteristics for rock grouting, which have been obtained from several dam sites, are studied, regarding the relationship between AE energy and rock behavior. In situ monitoring tests were carried out for three different rock types and some injection conditions using four to six channels AE acquisition system. Hydrofracture originated due to the injection pressure can be characterized by the AE energy parameter, that is, the deformation energy accumulated in the rock mass during pressurization process is proportional to the AE energy and also relates to the injection amount increase accompanied with the crack enlargement.<br>As a result, grout injection evaluation technique is proposed based on the AE multi-parameter method and, its effectiveness is clarified through the sampling data.

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