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Collaborating Authors
Lusaka Province
ABSTRACT: Karst terrains represent specific and highly complex hydrogeological, engineering, and environmental geological conditions that pose several potential hazards particularly if there are no restrictions on their landuse practices. The scenario in Lusaka offers such a classic example of a city almost wholly constructed on karstified marble. The presence of a cutter-and-pinnacled rockhead in the Lusaka marbles has caused a lot of foundation design and construction problems resulting from the casting of substructures for the same superstructure on soil and rock. Coupled with inadequate ground investigations, inadequate foundation design and construction practices, as well as increased anthropogenic activities such as those related to groundwater mining, these conditions pose a lot of performance risks to completed engineering structures. INTRODUCTION Construction in areas underlain by carbonate rocks can be environmentally risky and economically infeasible unless the possible solutioning-related problems can be identified in advance of project planning, design, and construction (FISCHER et aI., 1989). For Lusaka, inaugurated Zambia''s, then Northern Rhodesia''s new capital on 31st May 1935, the suitability of its location still remains a source of controversy today as it was during the early years of its founding in the beginning of the 1900s. This controversy originates from a number of factors, the major one being the nature of bedrock that underlies the city. THE NATURE OF BEDROCK UNDERLYING THE CITY Lusaka is underlain by a Paleo- to Meso-Proterozoic crystalline Basement Complex comprising quartzites and schists. This is unconformably overlain by strongly folded Neo-Proterozoic metasedimentary cover rocks that are dominated by thick and extensive sequences of dolomitic marbles with thin horizons of schists and quartzites. This appears to explain, among others, the general thickening of the dolomitic marbles from NE to SW, and fracturing that has been observed along marble-schist contacts.
cavity, construction site, cutter-and-pinnacled rockhead, differential settlement, engineering structure, environmental geological challenge, foundation design, karstified marble, Lusaka, lusaka area, lusaka marble, marble, pinnacle, Reservoir Characterization, rockhead, solid waste management, substructure, terrain, Upstream Oil & Gas, urban development, Zambia
Industry:
- Energy > Oil & Gas > Upstream (0.90)
- Water & Waste Management > Solid Waste Management (0.71)
Abstract This case study focuses on a $380 million project involving the development of eight new offshore fields in Block 2 Angola, which became a success story despite facing major obstacles during early phases of the project. This study highlights how a multi-dimensional approach to managing risk and uncertainty, coupled with excellent cooperation with Partners and government, can lead to an economic success. With the interruption of the Angolan peace process in 1992, Block 2 became directly affected during the construction phase of the project. For a two year period and until the signing of the Lusaka Peace Accords in 1994, which reestablished a cease-fire in Angola, mitigation of risk and uncertainty became the primary driver in completing this project. As a minority shareholder in Block 2, Texaco - Angola (Texaco Panama Inc. - Angola) as Operator needed to gain consensus among all its Partners and government for a revised development plan, taking into account some very divergent views of the risks facing the partnership. Ensuring the security of personnel, continuity of income, and maintaining sound project economics were required to gain the consensus needed to move ahead. A complete re-design of the development concept ensued while in the construction phase. The result was that this project was completed some 3 years later with acceptable economics. Unconventional and innovative design, financial hedging and project management solutions will be highlighted to illustrate how this was accomplished.
Angola, asset and portfolio management, block 2, construction phase, development plan, government, investment, managing development risk, Morris, multi-dimensional approach, operation, paradigm, platform, Project economics, project management, project valuation, risk driver, risk management, safety, spe 36623, stakeholder, strategic planning and management, subsea system, system reliability, Upstream Oil & Gas
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