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Construction of the inline pump station, Milwaukee, Wisconsin, U.S.A.
61A 9O1487 Effective sealing of drilled shafts in chalk Cobbs, J H; Cobbs, D C Proc Conference on Shaft Engineering, Harrogate, 5-7 Jane 1989 P99-107. Publ London: IMM. 1989
901491 Rehabilitation of the Armistice shaft Edwards, F A; Hwozdyk, L Proc Conference on Shaft Engineerbq, Harrogate, 5-7 June 1989 P155-167. Publ London: IMM, 1989
Drilled shaft sealing in chalk is discussed. Characteristics of chalk are outlined. The characteristics of the drilling mud, which influences effectiveness of grouting, and the reactions occurring between drilling mud, cement grout and chalk solids in the drilling mud are described. The effect of grouting in a casing to seal the annulus and techniques used are discussed. Finally, general procedures for grouting a casing in a shaft are described.
Rehabilitation and extension of a shaft are described. Selection of sinking hoist is first discussed. A procedure to replace timber sets with concrete rings was developed to increase the size of the compartments to accommodate equipment. Economics of the operation are presented. Work was undertaken in 2 phases. Phase one comprised preparation, collar refurbishment, service provision, dewatering and rehabilitation of the existing shaft. Phase two was deepening of the 1275 ft shaft to 4100 ft.
901488 Construction of shafts for the Greater Cairo Wastewater
Project
Coe, R H; Foreman, W; Harrison, N Proc Conference on Shaft Engineering, Harrogate, 5-7 Jane 1989 P109-128. Publ London: IMM, 1989 The design and construction of the 40 shafts for the main spine trunk sewer tunnel and branch tunnels are described. The shafts were sunk in waterbearing alluvial soils. The circular reinforced cast-in-situ concrete shafts were sunk in 2 stages to reduce settlement which would damage nearby buildings. The section was sunk first as a pneumatic caisson, then to its final depth by building on the segmental lining using underpinning and compressed air. Construction experience and procedures are described and compared with that expected. 901489 Construction of the inline pump station, Milwaukee, Wisconsin, U.S.A. Doig, P J Proc Conference on Shaft Engineering, Harrogate, 5-7 June 1989 P129-135. Publ London: [AIM, 1989 The inline pump station, comprising a number of shafts, a pump chamber and a suction header, was constructed in saturated alluvial and lacustrine deposits overlying dolomite. The shafts and pump chamber were pregrouted from the surface, the suction header tunnel advance grouted underground, and a full grout chamber for the pump chamber roof installed from a pilot drift. The saturated overburden was frozen for shaft sinking. Shaft construction, including freeze excavation, rock excavation by drill and blast, concrete lining of shafts, and screening shaft internal divider walls, is described. Tunnel excavation and pipe installation for the suction header, and excavation, shotcrete, and concrete lining for chamber construction are outlined.
Groundwater problems 901492 Seepage exclusion problem for sloping cylindrical cavities Philip, J R Water Resour Res V25, N6, June 1989, P1447-1448 Previous work has examined the general problem of water exclusion from and entry into macropores and cylindrical cavities with horizontal axes as a result of general downward unsaturated seepage. Solutions to the problems of sloping cylinders are derived on the basis of this work. Three dimensional flow around sloping cylinders may be specified using two scalar functions of two space coordinates. Liability to water entry decreases as slope of the cylinder axis increases. 901493 Analysis of accidental inundation at Face No 9101, Yangzhuang coal mine Zheng Bonian Proc International Sympasium on Modern Mining Technology, Taian, October 1988 t'246-261. Publ Taian: Shandong Institute of Mining and Technology, 1988 The face is sandwiched between two strike faults and cut by a third fault. The upper and lower sections are worked simultaneously. During preparation, major inundation from waterbearing, overlying limestone strata occurred. The heading was isolated, outflow points strengthened, and then sealed by grouting from surface drilled holes. Preventative measures are discussed, including judgement of potential water hazard, identification of water sources, and prediction of inflow and its development.
901490 Overview of current South African vertical circular shaft construction practice Douglas, A A B; Pfutzenreuter, F R B Proc Conference on Shaft Engineering, Harrogate, 5-7 June 1989 P137-154. Publ London: IMM, 1989
901494 Dewatering of dolomite by deep mining in the West Rand, South Africa Warwick, D W; Brackley, I J A; Connelly, R J; Campbell, G Proc 2nd Maltidisciplinary Conference on Sinkholes and the Environmental Impacts of Karat, Orlando, 9-11 February 1987 P349-358. Publ Rotterdam: A A Balkema. 1987
The phases and activities involved in the construction of a typical shaft are described. Collar construction and presinking are outlined. Sinking routines using drill and blast with mechanised muck removal are then considered with comments made on mechanised drilling, explosives and detonators. Sinking activities, such as cover drilling, curb-ring and lining placement, station construction, initial development and loading pocket construction, are described. Shaft steelwork preparation, set jigging and guide drilling are next outlined, followed by a description of the equipping phases. A glossary of local shaft sinking terms is presented.
Many West Rand gold mines are overlain by dolomite rocks. Some groundwater compartments are bounded by impermeable dykes, and dewatering with disposal outside the compartment may result in unacceptable subsidence and sinkholes. With recharge within the compartment or alternative dewatering methods, costs become excessive. An extensive program was undertaken to predict risk of subsidence from dewatering of the Gemsbokfontein compartment. Dewatering has commenced and after four months no subsidence is reported, although long term reliability of the predictions remains unknown.
© 1990 Pergamon Press plc. Reproduction not permitted
901491 Rehabilitation of the Armistice shaft Edwards, F A; Hwozdyk, L Proc Conference on Shaft Engineerbq, Harrogate, 5-7 June 1989 P155-167. Publ London: IMM, 1989
Drilled shaft sealing in chalk is discussed. Characteristics of chalk are outlined. The characteristics of the drilling mud, which influences effectiveness of grouting, and the reactions occurring between drilling mud, cement grout and chalk solids in the drilling mud are described. The effect of grouting in a casing to seal the annulus and techniques used are discussed. Finally, general procedures for grouting a casing in a shaft are described.
Rehabilitation and extension of a shaft are described. Selection of sinking hoist is first discussed. A procedure to replace timber sets with concrete rings was developed to increase the size of the compartments to accommodate equipment. Economics of the operation are presented. Work was undertaken in 2 phases. Phase one comprised preparation, collar refurbishment, service provision, dewatering and rehabilitation of the existing shaft. Phase two was deepening of the 1275 ft shaft to 4100 ft.
901488 Construction of shafts for the Greater Cairo Wastewater
Project
Coe, R H; Foreman, W; Harrison, N Proc Conference on Shaft Engineering, Harrogate, 5-7 Jane 1989 P109-128. Publ London: IMM, 1989 The design and construction of the 40 shafts for the main spine trunk sewer tunnel and branch tunnels are described. The shafts were sunk in waterbearing alluvial soils. The circular reinforced cast-in-situ concrete shafts were sunk in 2 stages to reduce settlement which would damage nearby buildings. The section was sunk first as a pneumatic caisson, then to its final depth by building on the segmental lining using underpinning and compressed air. Construction experience and procedures are described and compared with that expected. 901489 Construction of the inline pump station, Milwaukee, Wisconsin, U.S.A. Doig, P J Proc Conference on Shaft Engineering, Harrogate, 5-7 June 1989 P129-135. Publ London: [AIM, 1989 The inline pump station, comprising a number of shafts, a pump chamber and a suction header, was constructed in saturated alluvial and lacustrine deposits overlying dolomite. The shafts and pump chamber were pregrouted from the surface, the suction header tunnel advance grouted underground, and a full grout chamber for the pump chamber roof installed from a pilot drift. The saturated overburden was frozen for shaft sinking. Shaft construction, including freeze excavation, rock excavation by drill and blast, concrete lining of shafts, and screening shaft internal divider walls, is described. Tunnel excavation and pipe installation for the suction header, and excavation, shotcrete, and concrete lining for chamber construction are outlined.
Groundwater problems 901492 Seepage exclusion problem for sloping cylindrical cavities Philip, J R Water Resour Res V25, N6, June 1989, P1447-1448 Previous work has examined the general problem of water exclusion from and entry into macropores and cylindrical cavities with horizontal axes as a result of general downward unsaturated seepage. Solutions to the problems of sloping cylinders are derived on the basis of this work. Three dimensional flow around sloping cylinders may be specified using two scalar functions of two space coordinates. Liability to water entry decreases as slope of the cylinder axis increases. 901493 Analysis of accidental inundation at Face No 9101, Yangzhuang coal mine Zheng Bonian Proc International Sympasium on Modern Mining Technology, Taian, October 1988 t'246-261. Publ Taian: Shandong Institute of Mining and Technology, 1988 The face is sandwiched between two strike faults and cut by a third fault. The upper and lower sections are worked simultaneously. During preparation, major inundation from waterbearing, overlying limestone strata occurred. The heading was isolated, outflow points strengthened, and then sealed by grouting from surface drilled holes. Preventative measures are discussed, including judgement of potential water hazard, identification of water sources, and prediction of inflow and its development.
901490 Overview of current South African vertical circular shaft construction practice Douglas, A A B; Pfutzenreuter, F R B Proc Conference on Shaft Engineering, Harrogate, 5-7 June 1989 P137-154. Publ London: IMM, 1989
901494 Dewatering of dolomite by deep mining in the West Rand, South Africa Warwick, D W; Brackley, I J A; Connelly, R J; Campbell, G Proc 2nd Maltidisciplinary Conference on Sinkholes and the Environmental Impacts of Karat, Orlando, 9-11 February 1987 P349-358. Publ Rotterdam: A A Balkema. 1987
The phases and activities involved in the construction of a typical shaft are described. Collar construction and presinking are outlined. Sinking routines using drill and blast with mechanised muck removal are then considered with comments made on mechanised drilling, explosives and detonators. Sinking activities, such as cover drilling, curb-ring and lining placement, station construction, initial development and loading pocket construction, are described. Shaft steelwork preparation, set jigging and guide drilling are next outlined, followed by a description of the equipping phases. A glossary of local shaft sinking terms is presented.
Many West Rand gold mines are overlain by dolomite rocks. Some groundwater compartments are bounded by impermeable dykes, and dewatering with disposal outside the compartment may result in unacceptable subsidence and sinkholes. With recharge within the compartment or alternative dewatering methods, costs become excessive. An extensive program was undertaken to predict risk of subsidence from dewatering of the Gemsbokfontein compartment. Dewatering has commenced and after four months no subsidence is reported, although long term reliability of the predictions remains unknown.
© 1990 Pergamon Press plc. Reproduction not permitted