- Email: [email protected]
Excellent agricultural soils after surface mining
154A
893384 Active pressure studies in saturated expansive soil Moza, K K: Katti, R K; Katti, D R Proc Eighth Asian Regional Conference on Soil Mechanics and Foundation Engineering, Kyoto, 20-24 July 1987 VI, P189-192. Publ Japan." Japanese Socieo" /br Soil Mechanics and Foundation Engineering, 1987 Large scale laboratory tests were used to investigate lateral pressure in saturated expansive soil backfill behind a retaining wall. Pressure development and distribution with depth were studied for a fixed wall and for one rotated about its base. Expansive soils behave differently to non-expansive soils in this respect. Failure planes were determined. Lateral pressure equations were developed for the cases of no wall movement and rotation about the base.
893388 Experience with construction of slit foundations for an industrial building Mufazalov, M G; Ostyukov, B S: Basiev, A N: Pevzner. V A; Sidorov, B V Soil Alech Found Engng V25. NI. Jan-Feb 1988. P19-22 An alternative to conventional bored, cast-in-place piles is presented. At a site of layered, saturated soils, a novel type of slit foundation was used. The slit trench was dug using a commercially available clamshell excavator. Support until the reinforcing cage was inserted and concrete was poured was by a thixotropic slurry. Slurry feed and containment equipment is described.
893389 Trench tamping for high-voltage automatic-block line footings in transport construction Salnikov, B A; Badeev, A N Soil Mech Found Engng V25, NI, Jan-Feb 1988, P22-26
Construction methods 893385 Matching mining methods to complex coal geology Morash, B J CIM Bulletin VSI. N917, Sept 1988, P64-70 The 6 mineable coal seams at Quintette Coal Limited (QCL) vary in thickness from 0.75 to 9.5m and include waste partings varying from 0.2 to 4m thick. The seams are highly faulted and folded in some areas and dip angles range from horizontal to 90 degrees. This variation in thickness and orientation has led to 4 methods of recovery being used. The methods are described. Selection of mining method is governed by geology, and available equipment, ease of access, disposition of coal structure and mining recovery.
893386 Excellent agricultural soils after surface mining Jansen, I J; Hooks, C L Min Engng V40, Nil. Not" 1988. P1044-1047 Successful soil construction for reclamation of open pit mines is described. Selection of best materials for each layer and materials handling techniques to place each layer in the optimum physical condition are discussed. The influence of placement methods on soil strength is illustrated, and improvement of overcompacted soils considered.
893387 New technique for construction of industrial-sewage disposal ponds Puchkov, V N; Bereznitskii, Y A Soil Mech Found Engng V25, NI. Jan-Feb 1988, PIO-13 Seepage from settling basins and tailings ponds is undesirable. The cheapest method of isolating these structures is the use of slurry diaphragm walls, but costs increase significantly with depth to impervious layer. Limiting depth with present machinery is 50m. A new design of basin is described, where upper walls are stepped and constructed of concrete and geomembrane, and lower confinement is by diaphragm wall. This allows economic construction of large capacity deep basins and reduces maintenance costs.
Power line foundations are subject to moment, rather than horizontal or vertical, loading. The footing must be reliably embedded to develop the reaction moment. Tamped trenches with walls of high density and bearing capacity are often used. An investigation is described which has examined the range of soil conditions in which tamped trenches are possible and has evaluated various rammer designs. A steel rammer with a spring loaded tip is considered best.
893390 Continuous mining systems for surface coal mining Singhal, R K Proc Asian Mining '88, Kuala Lumpur, 8-10 March 1988 PI89-204. Publ London." IMM, 1988 A review of the state of the art machinery for surface coal mining and an evaluation of possible forthcoming technology is presented. Traditional scraper, shovel, and dragline systems which are still the most widely used are described and performance discussed. Bucket wheels and continuous mining systems are then introduced. Possible modes of excavation with the bucket wheel are illustrated. Combined mining systems for deeper excavations are also examined. Finally, present and future potential for automation and remote control are considered.
Groundwater problems 893391 Planning, operational and environmental aspects of open cut mining at Boundary Hill Mine, Central Queensland Parkin, R J Min Engr V148, N327, Dec 1988, P268-275 Operation of this large open pit coal mine is described. The pre-mining environment, including geology, climate, topography and land use, is first illustrated. Production planning, design of extraction program, mining operations, and post mining management are then considered. Attention is paid to a dewatering program intended to ease overburden conditions and decrease total moisture content of the coal.
1989 Pergamon Press pie. Reproduction not permitted
893384 Active pressure studies in saturated expansive soil Moza, K K: Katti, R K; Katti, D R Proc Eighth Asian Regional Conference on Soil Mechanics and Foundation Engineering, Kyoto, 20-24 July 1987 VI, P189-192. Publ Japan." Japanese Socieo" /br Soil Mechanics and Foundation Engineering, 1987 Large scale laboratory tests were used to investigate lateral pressure in saturated expansive soil backfill behind a retaining wall. Pressure development and distribution with depth were studied for a fixed wall and for one rotated about its base. Expansive soils behave differently to non-expansive soils in this respect. Failure planes were determined. Lateral pressure equations were developed for the cases of no wall movement and rotation about the base.
893388 Experience with construction of slit foundations for an industrial building Mufazalov, M G; Ostyukov, B S: Basiev, A N: Pevzner. V A; Sidorov, B V Soil Alech Found Engng V25. NI. Jan-Feb 1988. P19-22 An alternative to conventional bored, cast-in-place piles is presented. At a site of layered, saturated soils, a novel type of slit foundation was used. The slit trench was dug using a commercially available clamshell excavator. Support until the reinforcing cage was inserted and concrete was poured was by a thixotropic slurry. Slurry feed and containment equipment is described.
893389 Trench tamping for high-voltage automatic-block line footings in transport construction Salnikov, B A; Badeev, A N Soil Mech Found Engng V25, NI, Jan-Feb 1988, P22-26
Construction methods 893385 Matching mining methods to complex coal geology Morash, B J CIM Bulletin VSI. N917, Sept 1988, P64-70 The 6 mineable coal seams at Quintette Coal Limited (QCL) vary in thickness from 0.75 to 9.5m and include waste partings varying from 0.2 to 4m thick. The seams are highly faulted and folded in some areas and dip angles range from horizontal to 90 degrees. This variation in thickness and orientation has led to 4 methods of recovery being used. The methods are described. Selection of mining method is governed by geology, and available equipment, ease of access, disposition of coal structure and mining recovery.
893386 Excellent agricultural soils after surface mining Jansen, I J; Hooks, C L Min Engng V40, Nil. Not" 1988. P1044-1047 Successful soil construction for reclamation of open pit mines is described. Selection of best materials for each layer and materials handling techniques to place each layer in the optimum physical condition are discussed. The influence of placement methods on soil strength is illustrated, and improvement of overcompacted soils considered.
893387 New technique for construction of industrial-sewage disposal ponds Puchkov, V N; Bereznitskii, Y A Soil Mech Found Engng V25, NI. Jan-Feb 1988, PIO-13 Seepage from settling basins and tailings ponds is undesirable. The cheapest method of isolating these structures is the use of slurry diaphragm walls, but costs increase significantly with depth to impervious layer. Limiting depth with present machinery is 50m. A new design of basin is described, where upper walls are stepped and constructed of concrete and geomembrane, and lower confinement is by diaphragm wall. This allows economic construction of large capacity deep basins and reduces maintenance costs.
Power line foundations are subject to moment, rather than horizontal or vertical, loading. The footing must be reliably embedded to develop the reaction moment. Tamped trenches with walls of high density and bearing capacity are often used. An investigation is described which has examined the range of soil conditions in which tamped trenches are possible and has evaluated various rammer designs. A steel rammer with a spring loaded tip is considered best.
893390 Continuous mining systems for surface coal mining Singhal, R K Proc Asian Mining '88, Kuala Lumpur, 8-10 March 1988 PI89-204. Publ London." IMM, 1988 A review of the state of the art machinery for surface coal mining and an evaluation of possible forthcoming technology is presented. Traditional scraper, shovel, and dragline systems which are still the most widely used are described and performance discussed. Bucket wheels and continuous mining systems are then introduced. Possible modes of excavation with the bucket wheel are illustrated. Combined mining systems for deeper excavations are also examined. Finally, present and future potential for automation and remote control are considered.
Groundwater problems 893391 Planning, operational and environmental aspects of open cut mining at Boundary Hill Mine, Central Queensland Parkin, R J Min Engr V148, N327, Dec 1988, P268-275 Operation of this large open pit coal mine is described. The pre-mining environment, including geology, climate, topography and land use, is first illustrated. Production planning, design of extraction program, mining operations, and post mining management are then considered. Attention is paid to a dewatering program intended to ease overburden conditions and decrease total moisture content of the coal.
1989 Pergamon Press pie. Reproduction not permitted