Abstract
Observations of ground tilt arising from longwall mining subsidence were made using a direct method which involved trials with an electrolevel. The results are compared to tilt derived by precise levelling and by a current prediction method. The electrolevel proved to be highly successful in investigating ground tilt changes and enabled variations not hitherto appreciated to be examined. Subsidence and angle of draw were investigated and the electro-level was used to determine when a significant change in ground tilt condition occured owing to the approach of mining subsidence effects towards surface structures.
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