Abstract
A new cylindrical jack for surface rock stress measurement is described. The new jack consists of an adiprene rubber sleeve on a solid steel core. The new jack has been used successfully to measure rock stresses in an underground power station excavation and results from these tests are briefly described. The cylindrical jack method is compared with the well established flat jack method. Whilst the cylindrical jack method is only about a half as sensitive as the flat jack method it is satisfactorily accurate for rock stress measurement work. The cylindrical jack method also has advantages of speed and convenience and provides more information at each test site than the flat jack method.
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