Abstract One of the major rehabilitation projects in
Kuwait during the 1990s was improvement of t... more Abstract One of the major rehabilitation projects in Kuwait during the 1990s was improvement of the wastewater treatment plant at Jahra, a town 30 km north of Kuwait City. The project incorporates construction of a pumping station to collect the sewage via a network of sewer lines throughout the city. Groundwater occurs 4 m below the ground surface and construction specifications required lowering the groundwater table by 16 m to the foundation grade, 20 m below the ground surface. Open excavation with four stage well point system of dewatering was selected to ensure dry foundation conditions; but the system failed to lower the groundwater table down to the desired depth. Review of site investigation records and recalculation of field hydraulic conductivity resulted in design changes, augmenting the well point system with a number of deep wells and sumps to lower the water table down to the foundation grade. The paper discusses subsurface conditions and presents an analysis of the cause of failure of the well point system. The actual hydraulic conductivity proved to be several folds higher than the calculated one that was determined using Hazen’s formula. It was found that use of Hazen’s formula led to serious underestimation of field hydraulic conductivity. It is advised not to use such formulas without thorough investigation and proper interpretation of borehole data.
Abstract Kuwait City is a Middle Eastern coastal city characterized by
arid conditions with shall... more Abstract Kuwait City is a Middle Eastern coastal city characterized by arid conditions with shallow, saline groundwater. As some parts of the new ring road development were below the ground water level, 5,000 anchors were incorporated in the design to restrain the road against hydrostatic uplift pressures. About 750 anchors were only partially completed when they were inundated with aggressive groundwater for a period of about 2 years when dewatering was temporarily abandoned as a result of the Gulf War in 1990. Subsequently, physical, metallurgical and strength tests were undertaken to assess both the degree of corrosion and the long-term integrity of these partially completed anchors. The paper discusses the testing, the remedial measures and the long-term monitoring system. It was decided to keep some of the dewatering wells as a precautionary standby in case of future problems.
Abstract One of the major rehabilitation projects in
Kuwait during the 1990s was improvement of t... more Abstract One of the major rehabilitation projects in Kuwait during the 1990s was improvement of the wastewater treatment plant at Jahra, a town 30 km north of Kuwait City. The project incorporates construction of a pumping station to collect the sewage via a network of sewer lines throughout the city. Groundwater occurs 4 m below the ground surface and construction specifications required lowering the groundwater table by 16 m to the foundation grade, 20 m below the ground surface. Open excavation with four stage well point system of dewatering was selected to ensure dry foundation conditions; but the system failed to lower the groundwater table down to the desired depth. Review of site investigation records and recalculation of field hydraulic conductivity resulted in design changes, augmenting the well point system with a number of deep wells and sumps to lower the water table down to the foundation grade. The paper discusses subsurface conditions and presents an analysis of the cause of failure of the well point system. The actual hydraulic conductivity proved to be several folds higher than the calculated one that was determined using Hazen’s formula. It was found that use of Hazen’s formula led to serious underestimation of field hydraulic conductivity. It is advised not to use such formulas without thorough investigation and proper interpretation of borehole data.
Abstract Kuwait City is a Middle Eastern coastal city characterized by
arid conditions with shall... more Abstract Kuwait City is a Middle Eastern coastal city characterized by arid conditions with shallow, saline groundwater. As some parts of the new ring road development were below the ground water level, 5,000 anchors were incorporated in the design to restrain the road against hydrostatic uplift pressures. About 750 anchors were only partially completed when they were inundated with aggressive groundwater for a period of about 2 years when dewatering was temporarily abandoned as a result of the Gulf War in 1990. Subsequently, physical, metallurgical and strength tests were undertaken to assess both the degree of corrosion and the long-term integrity of these partially completed anchors. The paper discusses the testing, the remedial measures and the long-term monitoring system. It was decided to keep some of the dewatering wells as a precautionary standby in case of future problems.
Uploads
Papers by Fathi Shaqour
Kuwait during the 1990s was improvement of the wastewater
treatment plant at Jahra, a town 30 km north of
Kuwait City. The project incorporates construction of a
pumping station to collect the sewage via a network of
sewer lines throughout the city. Groundwater occurs 4 m
below the ground surface and construction specifications
required lowering the groundwater table by 16 m to the
foundation grade, 20 m below the ground surface. Open
excavation with four stage well point system of dewatering
was selected to ensure dry foundation conditions; but the
system failed to lower the groundwater table down to the
desired depth. Review of site investigation records and
recalculation of field hydraulic conductivity resulted in
design changes, augmenting the well point system with a
number of deep wells and sumps to lower the water table
down to the foundation grade. The paper discusses subsurface
conditions and presents an analysis of the cause of
failure of the well point system. The actual hydraulic
conductivity proved to be several folds higher than the
calculated one that was determined using Hazen’s formula.
It was found that use of Hazen’s formula led to serious
underestimation of field hydraulic conductivity. It is advised
not to use such formulas without thorough investigation
and proper interpretation of borehole data.
arid conditions with shallow, saline groundwater. As some parts of the
new ring road development were below the ground water level, 5,000
anchors were incorporated in the design to restrain the road against
hydrostatic uplift pressures. About 750 anchors were only partially
completed when they were inundated with aggressive groundwater
for a period of about 2 years when dewatering was temporarily abandoned as a result of the Gulf War in 1990. Subsequently, physical, metallurgical and strength tests were undertaken to assess both the degree of corrosion and the long-term integrity of these partially completed anchors. The paper discusses the testing, the remedial measures and the long-term monitoring system. It was decided to keep some of the dewatering wells as a precautionary standby in case of future problems.
Kuwait during the 1990s was improvement of the wastewater
treatment plant at Jahra, a town 30 km north of
Kuwait City. The project incorporates construction of a
pumping station to collect the sewage via a network of
sewer lines throughout the city. Groundwater occurs 4 m
below the ground surface and construction specifications
required lowering the groundwater table by 16 m to the
foundation grade, 20 m below the ground surface. Open
excavation with four stage well point system of dewatering
was selected to ensure dry foundation conditions; but the
system failed to lower the groundwater table down to the
desired depth. Review of site investigation records and
recalculation of field hydraulic conductivity resulted in
design changes, augmenting the well point system with a
number of deep wells and sumps to lower the water table
down to the foundation grade. The paper discusses subsurface
conditions and presents an analysis of the cause of
failure of the well point system. The actual hydraulic
conductivity proved to be several folds higher than the
calculated one that was determined using Hazen’s formula.
It was found that use of Hazen’s formula led to serious
underestimation of field hydraulic conductivity. It is advised
not to use such formulas without thorough investigation
and proper interpretation of borehole data.
arid conditions with shallow, saline groundwater. As some parts of the
new ring road development were below the ground water level, 5,000
anchors were incorporated in the design to restrain the road against
hydrostatic uplift pressures. About 750 anchors were only partially
completed when they were inundated with aggressive groundwater
for a period of about 2 years when dewatering was temporarily abandoned as a result of the Gulf War in 1990. Subsequently, physical, metallurgical and strength tests were undertaken to assess both the degree of corrosion and the long-term integrity of these partially completed anchors. The paper discusses the testing, the remedial measures and the long-term monitoring system. It was decided to keep some of the dewatering wells as a precautionary standby in case of future problems.