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The future of structural data from boreholes

Abstract This paper presents a review of both the advantages and the limitations associated with the collection of structural data using borehole imaging techniques. Case studies from excavations in hard rock in Australia and South East Asia are provided to compare with traditional methods of collecting structural data. Borehole imaging is a geophysical logging technique that produces a 360°-oriented image of the borehole wall. Initially developed by the petroleum industry, it is rapidly becoming a standard investigation tool for geological, hydrogeological, and geotechnical investigations. Borehole imaging is widely used to obtain reliable structural data, detect bedding orientation, for breakout analysis, for casing inspection, and for high-resolution caliper measurements. In excavated slopes, the orientation and characteristics of structures play a crucial role in slope stability. A significant advantage of borehole imaging is the ability to obtain reliable structural data in zones of core loss or in poor rock masses where traditional orientation techniques are difficult. While borehole imaging provides many advantages compared to traditional core orientation techniques, it is not a “silver bullet” and like any method, in the hands of the inexperienced may be misleading.