- Email: [email protected]
Use of fly ash in backfill at Kidd Creek Mines
185A failure at the grout/tendon interface,obtained from an uplift test on short anchors. The model accounts for borehole roughness. grout strength and anchor geometry. Loads and types of failure predicted by the model correlate with field data.
various fill mixes. Flyash can replace up to 60% of the Portland cement content if 3 months curing time is available, and 33% for one month curing. Fears of dust problems and radon emanation proved groundless. Significant savings are possible.
884250 Anchorage performance and reinforcement effect of fully grouted rockbolts on rock excavations Aydan, O; Kyoya, T; lchikawa, Y; Kawamoto, T Pvoc 6th International Conference on Rock Mechanics, Montreal, 30 Aug-10 Sept 1987 V2, P757-760. Publ Rotterdam: A A Balkema. 1987
884254 Fracture mechanics and support methods at T-junctions (in German and English) Gotze. W Giuckauf V124. N2. 21 Jan 1988. P71-76 (German). P28-33 (English)
Triaxial pull-out and push-out tests are used to investigate the performance of grouted rockbolts, and a numerical representation proposed. The model is then used to simulate bolts in pullout tests, and the reinforcement effects on rock pillars with a discontinuity and a tunnel in weak rock. There is reasonable correlation with existing data.
884251 Yielding anchor system to resist rockbursts Spann, H P Proc SANGORM Syrup: Design of rock reinforcing: components and systems, Johannesburg, 13 Nov 1987 P5-7. Publ Johannesburg: South African National Group on Rock Mechanics. 1987 A rockboh able to perform equally well under static or dynamic loading conditions is described. There is a yielding nut system on the threadbar so that the shear strength of the bar itself is not affected. Tests on the performance under static and dynamic loading conditions are presented.
884252 Design method for a cost optimal resin roofbolting support system for coal mine roofs van der Merwe, J N Proc SA NGORM Symp: Design of rock reinforcing: components and systems, Johannesburg, 13 Nov 1987 P19-32. Publ Johannesburg: South African National Group on Rock Mechanics. 1987 A method to calculate optimum tendon length, hole diameter and tendon spacing in a rock support system is developed. It is based on elements determined underground: thickness of weak layer, upper limit of hole spacing, upper limit of hole or tendon length and sliding resistance of resin/rock contact plane. Several safe combinations of these elements may be derived, and the most cost effective chosen. Two examples using the method are presented and the use of full column resin bonded systems discussed.
Fractured or fissured blocks in underground roadways may be present before drivage or caused by drivage. Supports must secure the roadway arches when the arch legs are removed to allow face passage, protect against collapse, prevent backfilling of road supports from falling out, and prevent roof and floor beds from pushing in in inclined roadways. The use of bolts, backfilling, and packing grout in conjunction with traditional arches and yielding arches is discussed.
884255 Improved support results by comprebenslve planning (In German and English) [rresberger, H Gluckauf V124. N3. 4 Feb 1988. P/57-/62 (German). P85-89 (English) High capacity yielding supports are expensive and are used as infrequently as possible. A number of rules relating support strength and convergence for strata and support planning arc presented and illustrated with examples. For stonedrif's and roadways, deformations and outlays can be worked out in advance, provided effects of face layout and extraction are taken into account. Improvement of face support success is also considered.
884256 Design of semi-circular support system in mine roadways Hassani, F P; Afrouz, A Proc 6th International Conference on Rock Mechanics, Montreal, 30 Aug-10 Sept 1987 V2, I>935-941. Publ Rotterdam: A A Balkema, 1987 Empirical and theoretical studies on the loading capacity of semi-circular H-section steel supports in fractured roof rock are presented. Results are plotted to form design charts which predict bearing capacity of the supports in various rock types and strata conditions.
884257 Integrated methods for colliery waste disposal and ground control and safety Atkins, A S; Aziz, N I; Singh, R N; Bridgwood, E W In: Ground Movement and Control Related to Coal Mining (papers to the Symposium, Illawarra, August 1986) P263268. Publ Parkville: AuslMM, 1986
Direct rock support methods See also: 884365 884253 Use of fly ash in backfill at Kidd Creek Mines Yu. T R; Counter, D B CIAI Bulletin i"81. N909, Jan 1988. P44-50 Fly ash has been adopted as a binder in cemented rockfill at Kidd Creek Mines. Laboratory and underground tests evaluated the compressive strengths and strength development of
Modern mechanised mining produces large amounts of extraneous dirt along with run of mine output. A system is proposed which uses liquid mine tailings to partially replace imported cementitious materials for ground control and other safety measures. Geotechnical and economic assessments are made and the system is compared with other monolithic packing materials. It is concluded that the material containing tailings is suitable on strength and cost grounds.
1988 Pergamon Press plc. Reproduction not permitted
various fill mixes. Flyash can replace up to 60% of the Portland cement content if 3 months curing time is available, and 33% for one month curing. Fears of dust problems and radon emanation proved groundless. Significant savings are possible.
884250 Anchorage performance and reinforcement effect of fully grouted rockbolts on rock excavations Aydan, O; Kyoya, T; lchikawa, Y; Kawamoto, T Pvoc 6th International Conference on Rock Mechanics, Montreal, 30 Aug-10 Sept 1987 V2, P757-760. Publ Rotterdam: A A Balkema. 1987
884254 Fracture mechanics and support methods at T-junctions (in German and English) Gotze. W Giuckauf V124. N2. 21 Jan 1988. P71-76 (German). P28-33 (English)
Triaxial pull-out and push-out tests are used to investigate the performance of grouted rockbolts, and a numerical representation proposed. The model is then used to simulate bolts in pullout tests, and the reinforcement effects on rock pillars with a discontinuity and a tunnel in weak rock. There is reasonable correlation with existing data.
884251 Yielding anchor system to resist rockbursts Spann, H P Proc SANGORM Syrup: Design of rock reinforcing: components and systems, Johannesburg, 13 Nov 1987 P5-7. Publ Johannesburg: South African National Group on Rock Mechanics. 1987 A rockboh able to perform equally well under static or dynamic loading conditions is described. There is a yielding nut system on the threadbar so that the shear strength of the bar itself is not affected. Tests on the performance under static and dynamic loading conditions are presented.
884252 Design method for a cost optimal resin roofbolting support system for coal mine roofs van der Merwe, J N Proc SA NGORM Symp: Design of rock reinforcing: components and systems, Johannesburg, 13 Nov 1987 P19-32. Publ Johannesburg: South African National Group on Rock Mechanics. 1987 A method to calculate optimum tendon length, hole diameter and tendon spacing in a rock support system is developed. It is based on elements determined underground: thickness of weak layer, upper limit of hole spacing, upper limit of hole or tendon length and sliding resistance of resin/rock contact plane. Several safe combinations of these elements may be derived, and the most cost effective chosen. Two examples using the method are presented and the use of full column resin bonded systems discussed.
Fractured or fissured blocks in underground roadways may be present before drivage or caused by drivage. Supports must secure the roadway arches when the arch legs are removed to allow face passage, protect against collapse, prevent backfilling of road supports from falling out, and prevent roof and floor beds from pushing in in inclined roadways. The use of bolts, backfilling, and packing grout in conjunction with traditional arches and yielding arches is discussed.
884255 Improved support results by comprebenslve planning (In German and English) [rresberger, H Gluckauf V124. N3. 4 Feb 1988. P/57-/62 (German). P85-89 (English) High capacity yielding supports are expensive and are used as infrequently as possible. A number of rules relating support strength and convergence for strata and support planning arc presented and illustrated with examples. For stonedrif's and roadways, deformations and outlays can be worked out in advance, provided effects of face layout and extraction are taken into account. Improvement of face support success is also considered.
884256 Design of semi-circular support system in mine roadways Hassani, F P; Afrouz, A Proc 6th International Conference on Rock Mechanics, Montreal, 30 Aug-10 Sept 1987 V2, I>935-941. Publ Rotterdam: A A Balkema, 1987 Empirical and theoretical studies on the loading capacity of semi-circular H-section steel supports in fractured roof rock are presented. Results are plotted to form design charts which predict bearing capacity of the supports in various rock types and strata conditions.
884257 Integrated methods for colliery waste disposal and ground control and safety Atkins, A S; Aziz, N I; Singh, R N; Bridgwood, E W In: Ground Movement and Control Related to Coal Mining (papers to the Symposium, Illawarra, August 1986) P263268. Publ Parkville: AuslMM, 1986
Direct rock support methods See also: 884365 884253 Use of fly ash in backfill at Kidd Creek Mines Yu. T R; Counter, D B CIAI Bulletin i"81. N909, Jan 1988. P44-50 Fly ash has been adopted as a binder in cemented rockfill at Kidd Creek Mines. Laboratory and underground tests evaluated the compressive strengths and strength development of
Modern mechanised mining produces large amounts of extraneous dirt along with run of mine output. A system is proposed which uses liquid mine tailings to partially replace imported cementitious materials for ground control and other safety measures. Geotechnical and economic assessments are made and the system is compared with other monolithic packing materials. It is concluded that the material containing tailings is suitable on strength and cost grounds.
1988 Pergamon Press plc. Reproduction not permitted