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Grouting to control groundwater during basement construction at St. Helier
213A 894352 Performance evaluation of foundation excavation in Rong Guang building
Shi,L P; Chang, K T; Yeh, H Y Proc Ninth Southeast Asian Geotechnical Conference, Bangkok, 7-11 December 1987 VI. P2.43.2.52. Publ Bangkok: Southeast Asian Geotechnical Society
Groundwater problems 894356 Dewatering optimization using a groundwater flow model at the Whitewood open-pit coal mine, Alberta Sumer, S M; Elton, J J; Tapics, J A Can Geotech J V25, N4, Nov 1988, P684-693
Excavation of the foundation utilised a diaphragm wall with struts as the earth retaining system. A monitoring system was installed to evaluate the behaviour of the surrounding soil and bracing system. SOIL-STRUCT, a computer program based on plane strain finite element analysis, was used to analyse soil-structure interaction for foundation excavation. Results show that depth of the first excavation stage has an important influence on the behaviour of the surrounding soil and structure system during foundation excavation.
High numbers of spoil pile and highwall failures were occurring at the mine due to high groundwater inflows into the pit and high pore pressures in highwalls, floor and spoil. A study of the most effective way to overcome these problems concluded dewatering by vertical wells behind the highwall was most suitable. A 2-D finite difference model was used to devise the optimum dewatering scheme. The model was able to determine optimum number, production schedule and location of the wells. The drainage system has resulted in increased coal recovery, decreased highwall failure and improved coal quality.
894353 Stress analysis of earth pressure with seepage flow during heavy rainstorms Kawamura, M; Watanabe, T Proc Ninth Southeast Asian Geotechnicul Conference, Bangkok, 7-11 December 1987 VI. P2.$3.2.62. Publ Bangkok: Southeast Asian Geotechnical Society
894357 Eleventh Canadian Geotechnical Colloquium: contaminant migration through groundwater - the role of modelling in the design of barriers Rowe, R K Can Geotech J V25, N4, Nov 1988, P778-798
An analytical method to determine earth pressures against retaining walls during heavy rainstorms is presented. Finite element analysis is used to couple analyses of stress and seepage flow. Examples for analysis of seepage flow and stress field are given, and the effect of seepage flow on coefficient for earth pressure considered.
Construction methods
The role of analysis in evaluation and design of barriers is discussed. Types of barriers are described. Transport mechanisms and governing equations, determination of diffusion and distribution coefficients, advective transport and leachate mounding and mass of contaminant are introduced. Techniques for calculating contaminant migration through barriers, analytical, finite layer, boundary element, finite difference and finite element, are described. The assessment of impact on landfills and underlying aquifers, concept of hydraulic trap and migration through fractured rock are considered. 74 refs. 894358 Grouting to control groundwater during basement construction at St. Helier Littlejohn, G S; Newman, R L; Kettle, C T Ground Engng V22, NI, Jan 1989, P22-31
894354 Dozers, draglines and cast blasting Harder, P Coal V25, Nil, Nor 1988, P82-84 Open pit mining in Wyoming is described. Cast blasting was introduced to reduce the overburden handling by the draglines. Presplitting is used to increase safety and reduce overburden, and dozers are used to clear the highwall.
894355 How to empty the 'too hard' basket. Applied research in an operating mine Scott, A Proc 8th AMIRA Technical Meeting, Advances in Blasting and Ground Support,Sydney, 8th October I987 P2.1-2.16. Publ Melbourne: AMIRAo 1987 Problems deserving attention are often deferred until they disappear or become critical. They may require changes in working practice for solution, and cooperation between research and mining personnel, without undue disruption of extraction, is essential. Some problems at Mount Thorley Mine, a multiseam open pit coal mine, are examined. Optimisation of economy of extraction by changes in blasting, applications of a surface miner, face attack miner, or continuous mining and conveying technology, and the balance between productivity and efficiency are discussed.
Problems associated with excavation of a basement at a site with subartesian water pressures in an aquifer underlying soft peat and alluvium are described. Tests showed that the alluvial layer was liable to heave through hydraulic uplift and liquefaction under rising pore water pressure. The construction of the recommended cutoff and tests undertaken to determine its effectiveness are described. This was not successful in preventing water inflow. Tube a mancbette grouting was then used with cement/bentonite grout followed by injection of resorcinol/formaldehyde. The basement was then completed free of hydraulic heave and water inflow. 894359 Koolan Island stope stability. Managing the deep pit option Dunlop, J S Proc 8th AMIRA Technical Meeting, Advances in Blasting and Ground Support,Sydney, 8th October 1987 P4.1-4.19. Publ Melbourne: AMIRA, 1987 The Koolan Island open pit iron ore mine reached the stage where operation was below water table level in 1985. Impact of groundwater seepage flow on pit stability was studied intensively. Dewatering and stability requirements were examined within the framework of overall economic operation of the mine. The geology and the various design options considered, and evaluation of various types of artificial support are
1989 Pergamon Press plc. Reproduction not permitted
Shi,L P; Chang, K T; Yeh, H Y Proc Ninth Southeast Asian Geotechnical Conference, Bangkok, 7-11 December 1987 VI. P2.43.2.52. Publ Bangkok: Southeast Asian Geotechnical Society
Groundwater problems 894356 Dewatering optimization using a groundwater flow model at the Whitewood open-pit coal mine, Alberta Sumer, S M; Elton, J J; Tapics, J A Can Geotech J V25, N4, Nov 1988, P684-693
Excavation of the foundation utilised a diaphragm wall with struts as the earth retaining system. A monitoring system was installed to evaluate the behaviour of the surrounding soil and bracing system. SOIL-STRUCT, a computer program based on plane strain finite element analysis, was used to analyse soil-structure interaction for foundation excavation. Results show that depth of the first excavation stage has an important influence on the behaviour of the surrounding soil and structure system during foundation excavation.
High numbers of spoil pile and highwall failures were occurring at the mine due to high groundwater inflows into the pit and high pore pressures in highwalls, floor and spoil. A study of the most effective way to overcome these problems concluded dewatering by vertical wells behind the highwall was most suitable. A 2-D finite difference model was used to devise the optimum dewatering scheme. The model was able to determine optimum number, production schedule and location of the wells. The drainage system has resulted in increased coal recovery, decreased highwall failure and improved coal quality.
894353 Stress analysis of earth pressure with seepage flow during heavy rainstorms Kawamura, M; Watanabe, T Proc Ninth Southeast Asian Geotechnicul Conference, Bangkok, 7-11 December 1987 VI. P2.$3.2.62. Publ Bangkok: Southeast Asian Geotechnical Society
894357 Eleventh Canadian Geotechnical Colloquium: contaminant migration through groundwater - the role of modelling in the design of barriers Rowe, R K Can Geotech J V25, N4, Nov 1988, P778-798
An analytical method to determine earth pressures against retaining walls during heavy rainstorms is presented. Finite element analysis is used to couple analyses of stress and seepage flow. Examples for analysis of seepage flow and stress field are given, and the effect of seepage flow on coefficient for earth pressure considered.
Construction methods
The role of analysis in evaluation and design of barriers is discussed. Types of barriers are described. Transport mechanisms and governing equations, determination of diffusion and distribution coefficients, advective transport and leachate mounding and mass of contaminant are introduced. Techniques for calculating contaminant migration through barriers, analytical, finite layer, boundary element, finite difference and finite element, are described. The assessment of impact on landfills and underlying aquifers, concept of hydraulic trap and migration through fractured rock are considered. 74 refs. 894358 Grouting to control groundwater during basement construction at St. Helier Littlejohn, G S; Newman, R L; Kettle, C T Ground Engng V22, NI, Jan 1989, P22-31
894354 Dozers, draglines and cast blasting Harder, P Coal V25, Nil, Nor 1988, P82-84 Open pit mining in Wyoming is described. Cast blasting was introduced to reduce the overburden handling by the draglines. Presplitting is used to increase safety and reduce overburden, and dozers are used to clear the highwall.
894355 How to empty the 'too hard' basket. Applied research in an operating mine Scott, A Proc 8th AMIRA Technical Meeting, Advances in Blasting and Ground Support,Sydney, 8th October I987 P2.1-2.16. Publ Melbourne: AMIRAo 1987 Problems deserving attention are often deferred until they disappear or become critical. They may require changes in working practice for solution, and cooperation between research and mining personnel, without undue disruption of extraction, is essential. Some problems at Mount Thorley Mine, a multiseam open pit coal mine, are examined. Optimisation of economy of extraction by changes in blasting, applications of a surface miner, face attack miner, or continuous mining and conveying technology, and the balance between productivity and efficiency are discussed.
Problems associated with excavation of a basement at a site with subartesian water pressures in an aquifer underlying soft peat and alluvium are described. Tests showed that the alluvial layer was liable to heave through hydraulic uplift and liquefaction under rising pore water pressure. The construction of the recommended cutoff and tests undertaken to determine its effectiveness are described. This was not successful in preventing water inflow. Tube a mancbette grouting was then used with cement/bentonite grout followed by injection of resorcinol/formaldehyde. The basement was then completed free of hydraulic heave and water inflow. 894359 Koolan Island stope stability. Managing the deep pit option Dunlop, J S Proc 8th AMIRA Technical Meeting, Advances in Blasting and Ground Support,Sydney, 8th October 1987 P4.1-4.19. Publ Melbourne: AMIRA, 1987 The Koolan Island open pit iron ore mine reached the stage where operation was below water table level in 1985. Impact of groundwater seepage flow on pit stability was studied intensively. Dewatering and stability requirements were examined within the framework of overall economic operation of the mine. The geology and the various design options considered, and evaluation of various types of artificial support are
1989 Pergamon Press plc. Reproduction not permitted