ABSTRACT:

Rockbursts under high stress environment is of prime concerns during underground excavations. Infrared camera thermography could be of some value for assessing hot spots at the excavation face, which may result in pop-ups, spalling or rockbursting. The authors undertook an experimental and monitoring program on the possibility of the utilization of the Infrared Camera Thermography (IRCT) for assessing the real-time stability of underground excavations. First, a series of laboratory tests on rock specimens and large rock blocks having a circular hole are tested under compression environment in relation to the deformation and rupture processes. Later, some observations were carried out at the excavation face of Taru-Toge tunnel before, during and after blasting operation in relation to assess the real-time stability of the excavation face. The authors present the outcomes of this unique experimental and monitoring program for real-time stability assessments of underground excavations and discuss their implications in actual applications.

1. INTRODUCTION
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