The assessment of long-term stability in major drivagesFunded under: ECSC-COALRES 7C
At the start of the contract, two significant projects involving major drivages were already under way, at Gascoigne Wood (Selby) and at Asfordby (Leicestershire). From Gascoigne Wood, two parallel surface drifts were being driven: the South Tunnel was 12.4 km long; the North Tunnel was 10 km long in April 1989. Some instrumentation had been installed in the South Tunnel to monitor a region of instability and monitoring of the North Tunnel was proposed. At Asfordby, pre-cast circular concrete linings were planned as the main support system. Instrumentation of the concrete-lined drivages was proposed in order to assess the design for future drivages. The development of rockbolting as a reliable and economic means of support, led to the use of twin rectangular roadways as the initial major drivages out of the Asfordby pit-bottom area. This report compares the performances of the rockbolted and concrete-lined support systems, describes the progress of the instrumentation schemes as the drivages proceed, and analyses the results in terms of the long-term stabilities. Finally, an assessment is made of the factors affecting long-term stability in drivages, and methods of improving designs are recommended.
Bibliographic Reference: EUR 15205 EN (1997) 126pp., FS, ECU 21.50
Availability: Available from the (2)
ISBN: ISBN 92-827-9249-8
Record Number: 199710162 / Last updated on: 1997-04-01
Original language: en
Available languages: en