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The effects of in situ stress on mine layout and the method of tunnel support have only recently been taken into account in the design of coal mines. The measurement of in situ stress has been made by hydraulic fracture and overcoring techniques in the coal measures but each has limitations and the areas covered and the range of lithology types in which the tests were conduced is quite small. This project was focused on obtaining hydrofracture stress measurements from several surface boreholes at one developing coal mine (Asfordby), to investigate any variations in horizontal stress, both laterally over the area of the mine and at individual borehole sites, that could be related to either detailed lithology changes or the general geology of the mine. The results are given in this report. In addition to in situ hydraulic fracture tests, a number of laboratory tests were carried out on the strata cores including elastic properties, hydraulic tensile strength and fracture toughness.

Additional information

Authors: WHITWORTH K, British Coal Corporation, Cheltenham (GB);ONIONS K, British Coal Corporation, Cheltenham (GB);NORTH M, British Coal Corporation, Cheltenham (GB)
Bibliographic Reference: EUR 17163 EN (1997) 111pp., FS, ECU 20.00
Availability: Available from the (2)
ISBN: ISBN 92-826-8910-7
Record Number: 199710636 / Last updated on: 1997-05-26
Original language: en
Available languages: en
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