Abstract
Abstract Precision water-level gauges, magnet extensometers and invar wire extensometers have been designed and used by the Building Research Establishment to continuously measure horizontal and vertical ground movements above the abandoned Castlefields limestone mine, Dudley. All the instrumentation operated automatically and was controlled by computerized data logger. Details are given here of instrument design and performance, and of the observed ground movements over a three year period, including before, during and after filling of the mine with rock paste. Ground displacements have been very small, indicating general stability of strata above the mine, despite known frequent falls from the mine roof prior to filling with rock paste. Rock paste has been demonstrated to be an acceptable new technique from the standpoint of not causing a temporary increase in mine instability during injection. Trial borehole electro-levels are described and recommended as robust economical devices which can give warning of ground subsidence over mines.
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