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Personal computer for primary pumping results interpretation in real time
248A research and management are considered. Environmental protection measures and constraints in achieving high productivity are discussed.
885373 Stability of a large excavation with vertical sides filled with thixotropic clay (In French) Devolder, H; Pirson, O; Nomerange, J; Monjoie, A; PoloChiapolini, C; Provost, M; Devillers, J J Proc 5th International Congress International Association of Engineering Geology, Buenos Aires, 20-25 October 1986 113, P1863-1873. Publ Rotterdam: A A Balkema, 1986
sand and gravel. Laboratory and field tests were used to measure site hydraulic properties. At the design stage various inflow models were examined. Their applicability was tested against field measurements. The basic principles involved can be applied to all similar groundwater lowering projects.
885377 Personal computer for primary pumping results interpretation in real time Plch, J; Klauco, S Proc Ninth European Conference on Soil Mechanics and Foundation Engineering, Groundwater Effects in Geotechaicai Engineering, Dublin, 31 Aug-3 Sept 1987 VI, P227-230. Publ Rotterdam." A A Balkema, 1987
As part of a project for a shallow (cut and cover depth) metro, a new construction method was developed, which entails placing prefabricated concrete frames into staged large excavations with vertical sides, supported by filling with a bentonite slurry. The edges of an experimental excavation were loaded to simulate railway traffic and the effects of nearby foundations. Measured wall stability was compared with that predicted using existing design methods, and modifications to produce an appropriate calculation method suggested.
The foundation pit for the float chamber of a waterworks on the river Danube is 428mx188mx47m deep in very permeable sands and gravels. Clay concrete diaphragm walls and a grouted floor were constructed and dewatering using 20 pumping wells commenced. Water levels were measured in observation boreholes. Readings were used as input to model the flow in real time using a PC. Results are presented.
885374 Performance of fin drains in a road cutting Samuel, H R; Farrar, D M; Jewell, R A; Wale, J H Proc Ninth European Conference on Soil Mechanics and Foundation Engineering, Groundwater Effects in Geotechnical Engineering, Dublin, 31 Aug-3 Sept 1987 VI, P241-244.- Publ Rotterdam: A A Balkema. 1987
885378 Artificial groundwater recharging for important civil engineering projects Raedschelders, H; Maertens, J Proc Ninth European Conference on Soil Mechanics and Foundation Engineering, Groundwater Effects in Geotechn&al Engineering, Dublin, 31 Aug-3 Sept 1987 VI, P231-234. Publ Rotterdam: A A Balkema. 1987
The performance over 6 years of two geotextiles in fin drains at a highway cutting in clay is described. The drains were still effective and there was no significant change in flow rate. Laboratory examination showed the flow rate of the geotextiles had changed little, although localised problems of clogging, associated with poor installation procedures, were observed. In situ and laboratory measured flow properties were not the same.
Groundwater problems 885375 Decreasing of water pressure in an artesian aquifer for deep excavation Mazurkiewicz, B K Proc Ninth European Conference on Soil Mechanics and Foundation Engineering, Groundwater Effects in Geotechnical Engineering, Dublin, 31 Aug-3 Sept 1987 V1, P193-196. Publ Rotterdam: A A Balkema, 1987 A dry dock was constructed in Poland with its bottom slab 13.4m below mean sea level. It was sited above an artesian aquifer with stabilised level 3m above mean sea level. It was necessary to reduce artesian pressure to a level sustainable by the soil layer between the excavation bottom and the aquifer. Dewatering of the aquifer is described.
885376 Calculation and realization of groundwater lowering installations for large size building pits Placzek, D Proc Ninth European Conference on Soil Mechanics and Foundation Engineering, Groundwater Effects in Geotechaicai Engineering, Dublin, 31 Aug-3 Sept 1987 VI, P221-225. Publ Rotterdam." A A Balkema, 1987 Dewatering of a large building pit, approximately 45000 sq m in area and I lm deep, is described. About 3.5m of sand overlays about 7.8m of loam and boulder clay over pleistocene
Settlement of compressible layers due to groundwater lowering can cause damage in the vicinity of construction projects. When dewatering was necessary for the construction of two sea locks in Belgium, artificial recharge was used to maintain the groundwater level below a nearby refinery. Experience indicates that accurate prediction of groundwater lowering is possible, even in complex situations with well calibrated mathematical models. Recharge wells can have suitable lifetimes, up to 5 years, if properly designed and constructed.
885379 Methods for controlling the ground water table in the Stockholm area Sjoberg, S G; Svensson, P L; Tenne, M Proc Ninth European Conference on Soil Mechanics and Foundation Engineering, Groundwater Effects in Geotechaical Engineering, Dublin, 31 Aug-3 Sept 1987 VI. P255-258. Publ Rotterdam." A A Balkema, 1987 In the past, damage resulted from settlement due to water table lowering caused by tunnelling around Stockholm. Preventative methods now employed include grouting ahead of the tunnel face and the use of cut offs. Remedial methods include artificial recharge from tunnels or boreholes, watering of wooden piles, and percolation of surface water.
885380 Groundwater control by pressure relief and recharge Troughton, V M Proc Ninth European Conference on Soil Mechanics and Foundation Engineering, Groundwater Effects in Geotechnical Engineering, Dublin, 31 Aug-3 Sept 1987 VI, P259-264. Publ Rotterdam: A A Balkema, 1987 Construction of a basement in alluvial sands and clays is described. It was necessary to limit drawdown beneath an adjacent structure, relieve pressures in clays and sands below the formation and dispose of the water by recharge at the site. Pressure relief was investigated by pumping tests and computer seepage analysis. Limiting water pressures were specified
~) 1988 Pergamon Press plc. Reproduction not permitted
885373 Stability of a large excavation with vertical sides filled with thixotropic clay (In French) Devolder, H; Pirson, O; Nomerange, J; Monjoie, A; PoloChiapolini, C; Provost, M; Devillers, J J Proc 5th International Congress International Association of Engineering Geology, Buenos Aires, 20-25 October 1986 113, P1863-1873. Publ Rotterdam: A A Balkema, 1986
sand and gravel. Laboratory and field tests were used to measure site hydraulic properties. At the design stage various inflow models were examined. Their applicability was tested against field measurements. The basic principles involved can be applied to all similar groundwater lowering projects.
885377 Personal computer for primary pumping results interpretation in real time Plch, J; Klauco, S Proc Ninth European Conference on Soil Mechanics and Foundation Engineering, Groundwater Effects in Geotechaicai Engineering, Dublin, 31 Aug-3 Sept 1987 VI, P227-230. Publ Rotterdam." A A Balkema, 1987
As part of a project for a shallow (cut and cover depth) metro, a new construction method was developed, which entails placing prefabricated concrete frames into staged large excavations with vertical sides, supported by filling with a bentonite slurry. The edges of an experimental excavation were loaded to simulate railway traffic and the effects of nearby foundations. Measured wall stability was compared with that predicted using existing design methods, and modifications to produce an appropriate calculation method suggested.
The foundation pit for the float chamber of a waterworks on the river Danube is 428mx188mx47m deep in very permeable sands and gravels. Clay concrete diaphragm walls and a grouted floor were constructed and dewatering using 20 pumping wells commenced. Water levels were measured in observation boreholes. Readings were used as input to model the flow in real time using a PC. Results are presented.
885374 Performance of fin drains in a road cutting Samuel, H R; Farrar, D M; Jewell, R A; Wale, J H Proc Ninth European Conference on Soil Mechanics and Foundation Engineering, Groundwater Effects in Geotechnical Engineering, Dublin, 31 Aug-3 Sept 1987 VI, P241-244.- Publ Rotterdam: A A Balkema. 1987
885378 Artificial groundwater recharging for important civil engineering projects Raedschelders, H; Maertens, J Proc Ninth European Conference on Soil Mechanics and Foundation Engineering, Groundwater Effects in Geotechn&al Engineering, Dublin, 31 Aug-3 Sept 1987 VI, P231-234. Publ Rotterdam: A A Balkema. 1987
The performance over 6 years of two geotextiles in fin drains at a highway cutting in clay is described. The drains were still effective and there was no significant change in flow rate. Laboratory examination showed the flow rate of the geotextiles had changed little, although localised problems of clogging, associated with poor installation procedures, were observed. In situ and laboratory measured flow properties were not the same.
Groundwater problems 885375 Decreasing of water pressure in an artesian aquifer for deep excavation Mazurkiewicz, B K Proc Ninth European Conference on Soil Mechanics and Foundation Engineering, Groundwater Effects in Geotechnical Engineering, Dublin, 31 Aug-3 Sept 1987 V1, P193-196. Publ Rotterdam: A A Balkema, 1987 A dry dock was constructed in Poland with its bottom slab 13.4m below mean sea level. It was sited above an artesian aquifer with stabilised level 3m above mean sea level. It was necessary to reduce artesian pressure to a level sustainable by the soil layer between the excavation bottom and the aquifer. Dewatering of the aquifer is described.
885376 Calculation and realization of groundwater lowering installations for large size building pits Placzek, D Proc Ninth European Conference on Soil Mechanics and Foundation Engineering, Groundwater Effects in Geotechaicai Engineering, Dublin, 31 Aug-3 Sept 1987 VI, P221-225. Publ Rotterdam." A A Balkema, 1987 Dewatering of a large building pit, approximately 45000 sq m in area and I lm deep, is described. About 3.5m of sand overlays about 7.8m of loam and boulder clay over pleistocene
Settlement of compressible layers due to groundwater lowering can cause damage in the vicinity of construction projects. When dewatering was necessary for the construction of two sea locks in Belgium, artificial recharge was used to maintain the groundwater level below a nearby refinery. Experience indicates that accurate prediction of groundwater lowering is possible, even in complex situations with well calibrated mathematical models. Recharge wells can have suitable lifetimes, up to 5 years, if properly designed and constructed.
885379 Methods for controlling the ground water table in the Stockholm area Sjoberg, S G; Svensson, P L; Tenne, M Proc Ninth European Conference on Soil Mechanics and Foundation Engineering, Groundwater Effects in Geotechaical Engineering, Dublin, 31 Aug-3 Sept 1987 VI. P255-258. Publ Rotterdam." A A Balkema, 1987 In the past, damage resulted from settlement due to water table lowering caused by tunnelling around Stockholm. Preventative methods now employed include grouting ahead of the tunnel face and the use of cut offs. Remedial methods include artificial recharge from tunnels or boreholes, watering of wooden piles, and percolation of surface water.
885380 Groundwater control by pressure relief and recharge Troughton, V M Proc Ninth European Conference on Soil Mechanics and Foundation Engineering, Groundwater Effects in Geotechnical Engineering, Dublin, 31 Aug-3 Sept 1987 VI, P259-264. Publ Rotterdam: A A Balkema, 1987 Construction of a basement in alluvial sands and clays is described. It was necessary to limit drawdown beneath an adjacent structure, relieve pressures in clays and sands below the formation and dispose of the water by recharge at the site. Pressure relief was investigated by pumping tests and computer seepage analysis. Limiting water pressures were specified
~) 1988 Pergamon Press plc. Reproduction not permitted