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Evaluation of comparative performance of fibre and mesh reinforced shotcrete linings
307A 915328 Dynamic response of rock bolt systems
Shotcrete
Littlejohn, G S; Mothersille, D K V; Rodger, A A hoc 2nd International Conference on Foundarions and
915332
Tumek, London, 19-21 September 1989 V2. P57-64. Pub1 Edinburgh: Engineering Technics Press, 1989
Richards, J A; McLea, R K; Wigginton, R Excauate and Support in rhe 9Os, Proc SANCOT Seminar 1990, South Africa, November 1990 PI-6. Pub1 South Africa:
During construction of the Penmaenbach Tunnel in strong rhyolite rock, 6m long fully bonded resin bolts were routinely installed and post-tensioned to 100kN. Bolt performance at distances 0.7-20m from the face was monitored during blasting. Relations were established between peak particle velocity and peak dynamic load. Prestressing decreases the effects of vibrational loading on the bolt. All deformations were elastic for accelerations lo-64Og, and bolt performance was not significantly affected, even at lm from the blast face. 915329 Ground anchor tests in Kuwait ‘gatch’ soil Al-Shaikh Ali, M M H; Al-Abdullah, A A; Abdul Rahim, Z A
Proc 2nd International Conference on Foundarions and Tunnels, London, 19-21 September 1989 V2. P65-85. Pub1 Edinburgh: Engineering Technics Press, 1989
Gatch soil, calcareous, gypsiferous sand which is moderately to well cemented, is found to considerable depth in Kuwait. Construction of the ring road required some sections in cuts below the water table, with base slabs supported by ground anchors. Proving tests were carried out for several designs of anchors. Acceptance criteria and the determination of Ko from the tests are described. Field observations of performance from two sections under construction are presented for comparison. 915330 Effect of varying load amplitudes on the behaviour of anchor
Hanna, T H; Al-Mosawe, M J Proc 2nd International Conference on Foundations and Tunnels, London, 19-21 September 1989 V2, P87-95. Pub1 Edinburgh: Engineering Technics Press, 1989
In practice, repeated loads on structures vary in a somewhat random manner, and assessment of stress history and its effect on anchor performance is difficult. Laboratory tests on anchors with a range of loading sequences of different types of cyclic loading are described. In each case anchor response was seen to be largely dependent on type and magnitude of pfevious stress. A cumulative damage rule, similar to that observed in metals, is developed to predict fatigue life of anchors in sand under random loading.
Long term performance of primary tunnel support systems
Goldfelds Press, 1990
The second parallel bore of the Huguenot tunnel was left with primary support only for much longer than originally envisaged. Construction was by drill and blast through granitic rock. As geology was well known from the pilot bore, only minimum support was applied. Short and long term support performance is described. Long term deterioration of weathered rock and joint fill, block loosening, and deterioration in rocks on apparently sound zones adjacent to supported fault or shear zones were seen. Balance of costs between initial support density and its required support life is discussed. 915333 Evaluation of comparative performance of fibre and mesh reinforced shotcrete linings
Redford, M S; Alexander, M Excavate and Supporr in the 9Os, Proc SANCOT Seminar 1990, South Africa, November 1990 P7-22. Publ South Africa: GoldJields Press, 1990 During the construction of a railway tunnel which was to be permanently shotcrete lined, studies were carried out to establish comparative performance of fibre reinforced and mesh reinforced concrete. Panels containing mesh or either Aramix or Fibrex steel fibres were tested as slabs, simply supported at four corners. Technical and cost comparisons are made, and possible extension of the use of fibre reinforced shotcrete is discussed. 915334 Steelfibre shotcrete in mining and tunnelling
Amtsbuchler, R Excavare and Support in rhe 9Os, Proc SA NCOT Seminar 1990, South Africa, November 1990 P23-30. Pub1 South Africa: Goldfields Press, 1990
Dry shotcreting of steel-fibre linings is a predominant support technique applied in deep underground South African mines. Two case studies of its application under difficult conditions are presented. The first study analyses the support of a partly collapsed shaft, the second study looks at the application of shotcrete lining of two ore passes. Also discussed is the application of the steel fibre shotcrete in lining a water tunnel.
915331 Group action of anchors with varying depth of embedment in sand
Direct rock
support
Al Shakarchi, Y J; Jameel, N Z Proc 2nd International Conference on Foundations and Tunnels, London, 19-21 September 1989 V2. P105-112. Publ
915335
Edinburgh: Engineering Technics Press. 1989
stations (In German)
Laboratory sand box tests were used to study interactions between anchors in groups of 2, 3, or 4 in a line, with varying or identical depth of embedment within the group. Ultimate pullout loads for the group with varying depth were greater than corresponding load for groups of constant embedment at certain depth and spacing. Configuration has a clear effect on group efficiency. Observation of slip surfaces shows physical interference between zones of influence. Results are discussed with reference to theory of Meyerhof and Adams (1968). 0
methods
Filling of cavities with filter dust from coal-fired power Frysz, S; Dziubek, T Gluckauf Vl27, N7/8, April 1991. P272-277 Filter dust from coal fired power stations has been successfully used to backfill cavities at the Boleslaw Smialy colliery in Poland. A pneumatic stowing technique has been developed, features of which are effective dust suppression and remote operation of couplings to open and close the stowing line, allowing face workers to operate in as clean an atmosphere as is possible in underground mines.
1991 Pergamon Press plc. Reproduction
not permitted
Shotcrete
Littlejohn, G S; Mothersille, D K V; Rodger, A A hoc 2nd International Conference on Foundarions and
915332
Tumek, London, 19-21 September 1989 V2. P57-64. Pub1 Edinburgh: Engineering Technics Press, 1989
Richards, J A; McLea, R K; Wigginton, R Excauate and Support in rhe 9Os, Proc SANCOT Seminar 1990, South Africa, November 1990 PI-6. Pub1 South Africa:
During construction of the Penmaenbach Tunnel in strong rhyolite rock, 6m long fully bonded resin bolts were routinely installed and post-tensioned to 100kN. Bolt performance at distances 0.7-20m from the face was monitored during blasting. Relations were established between peak particle velocity and peak dynamic load. Prestressing decreases the effects of vibrational loading on the bolt. All deformations were elastic for accelerations lo-64Og, and bolt performance was not significantly affected, even at lm from the blast face. 915329 Ground anchor tests in Kuwait ‘gatch’ soil Al-Shaikh Ali, M M H; Al-Abdullah, A A; Abdul Rahim, Z A
Proc 2nd International Conference on Foundarions and Tunnels, London, 19-21 September 1989 V2. P65-85. Pub1 Edinburgh: Engineering Technics Press, 1989
Gatch soil, calcareous, gypsiferous sand which is moderately to well cemented, is found to considerable depth in Kuwait. Construction of the ring road required some sections in cuts below the water table, with base slabs supported by ground anchors. Proving tests were carried out for several designs of anchors. Acceptance criteria and the determination of Ko from the tests are described. Field observations of performance from two sections under construction are presented for comparison. 915330 Effect of varying load amplitudes on the behaviour of anchor
Hanna, T H; Al-Mosawe, M J Proc 2nd International Conference on Foundations and Tunnels, London, 19-21 September 1989 V2, P87-95. Pub1 Edinburgh: Engineering Technics Press, 1989
In practice, repeated loads on structures vary in a somewhat random manner, and assessment of stress history and its effect on anchor performance is difficult. Laboratory tests on anchors with a range of loading sequences of different types of cyclic loading are described. In each case anchor response was seen to be largely dependent on type and magnitude of pfevious stress. A cumulative damage rule, similar to that observed in metals, is developed to predict fatigue life of anchors in sand under random loading.
Long term performance of primary tunnel support systems
Goldfelds Press, 1990
The second parallel bore of the Huguenot tunnel was left with primary support only for much longer than originally envisaged. Construction was by drill and blast through granitic rock. As geology was well known from the pilot bore, only minimum support was applied. Short and long term support performance is described. Long term deterioration of weathered rock and joint fill, block loosening, and deterioration in rocks on apparently sound zones adjacent to supported fault or shear zones were seen. Balance of costs between initial support density and its required support life is discussed. 915333 Evaluation of comparative performance of fibre and mesh reinforced shotcrete linings
Redford, M S; Alexander, M Excavate and Supporr in the 9Os, Proc SANCOT Seminar 1990, South Africa, November 1990 P7-22. Publ South Africa: GoldJields Press, 1990 During the construction of a railway tunnel which was to be permanently shotcrete lined, studies were carried out to establish comparative performance of fibre reinforced and mesh reinforced concrete. Panels containing mesh or either Aramix or Fibrex steel fibres were tested as slabs, simply supported at four corners. Technical and cost comparisons are made, and possible extension of the use of fibre reinforced shotcrete is discussed. 915334 Steelfibre shotcrete in mining and tunnelling
Amtsbuchler, R Excavare and Support in rhe 9Os, Proc SA NCOT Seminar 1990, South Africa, November 1990 P23-30. Pub1 South Africa: Goldfields Press, 1990
Dry shotcreting of steel-fibre linings is a predominant support technique applied in deep underground South African mines. Two case studies of its application under difficult conditions are presented. The first study analyses the support of a partly collapsed shaft, the second study looks at the application of shotcrete lining of two ore passes. Also discussed is the application of the steel fibre shotcrete in lining a water tunnel.
915331 Group action of anchors with varying depth of embedment in sand
Direct rock
support
Al Shakarchi, Y J; Jameel, N Z Proc 2nd International Conference on Foundations and Tunnels, London, 19-21 September 1989 V2. P105-112. Publ
915335
Edinburgh: Engineering Technics Press. 1989
stations (In German)
Laboratory sand box tests were used to study interactions between anchors in groups of 2, 3, or 4 in a line, with varying or identical depth of embedment within the group. Ultimate pullout loads for the group with varying depth were greater than corresponding load for groups of constant embedment at certain depth and spacing. Configuration has a clear effect on group efficiency. Observation of slip surfaces shows physical interference between zones of influence. Results are discussed with reference to theory of Meyerhof and Adams (1968). 0
methods
Filling of cavities with filter dust from coal-fired power Frysz, S; Dziubek, T Gluckauf Vl27, N7/8, April 1991. P272-277 Filter dust from coal fired power stations has been successfully used to backfill cavities at the Boleslaw Smialy colliery in Poland. A pneumatic stowing technique has been developed, features of which are effective dust suppression and remote operation of couplings to open and close the stowing line, allowing face workers to operate in as clean an atmosphere as is possible in underground mines.
1991 Pergamon Press plc. Reproduction
not permitted