Practical Case Studies: Ground Improvement
The following case studies illustrate real-world scenarios where different ground improvement techniques are selected and applied based on specific engineering criteria.
Objectives of Ground Improvement
Example
Case Study 1: Mitigating Liquefaction in a Seismic Zone
A new hospital is planned in a region with high seismicity. The geotechnical investigation reveals a 15-meter thick layer of loose, saturated, uniform sand near the surface. The primary objective is to mitigate the liquefaction potential to ensure the hospital remains operational after a major earthquake.
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Example
Case Study 2: Reducing Settlement in Soft Clays
A large warehouse facility is to be constructed over a deposit of normally consolidated, soft marine clay that is 20 meters thick. The anticipated structural loads are expected to cause excessive total and differential settlements over time, potentially damaging the warehouse floor slab. The objective is to reduce compressibility and accelerate settlement before construction begins.
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Classification of Ground Improvement Techniques
Example
Case Study 3: Selecting Modification by Inclusions for a Retaining Structure
A highway expansion requires the construction of a steep embankment next to an existing right-of-way. Traditional retaining walls are deemed too expensive. The engineer must choose a ground improvement technique that provides structural support and reinforcement to the soil mass.
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Case Study 4: Physical/Chemical Modification for Subgrade Stabilization
During the construction of an airport runway, the subgrade is found to consist of highly plastic, expansive clay. This clay swells when wet and shrinks when dry, which would quickly destroy the runway pavement. The technique must alter the fundamental properties of the clay.
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Engineering Criteria for Method Selection
Example
Case Study 5: Navigating Depth and Environmental Constraints
A multi-story commercial building is planned in a dense urban environment. The site is underlain by 12 meters of loose silty sand that requires densification. Dynamic compaction is initially considered due to its effectiveness in sandy soils up to this depth.
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Case Study 6: Balancing Project Timeline and Economic Feasibility
A port expansion project involves constructing new container storage yards on recently reclaimed land consisting of 8 meters of soft, dredged clay. The project has a strict deadline for operation within 6 months.
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