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Phases of EGS and its tasks
Short answer
EGS phases: reconnaissance (desk study, fatal flaws), feasibility (mapping, trial pits, boreholes), detailed design (detailed mapping, drilling, in-situ/lab tests, rock classification, design of foundation, slopes, grouting), construction (mapping, revising support), operation (monitoring). Detailed design: confirm foundation conditions, define parameters, delineate weak zones, design excavation, support, drainage, and locate materials.
What are the phases of an Engineering Geological System (EGS)? Point out the major engineering geological tasks in each phase, especially the detailed design phase.
The engineering geological study (system) of a project is carried out in successive phases, each more detailed than the previous one, so that geological uncertainty and risk fall as the design develops.
| Phase | Main engineering geological tasks |
|---|---|
| 1. Reconnaissance / pre-feasibility | Desk study, air-photo interpretation, quick walk-over survey, identify fatal geological flaws and alternative sites |
| 2. Feasibility / preliminary | Engineering geological mapping of the alternative sites (1:5,000-1:25,000), trial pits, a few boreholes, geophysical profiles, rough assessment of rock quality, construction material and hazards; compare alternatives |
| 3. Detailed design | Detailed large-scale mapping of the chosen site, closely spaced core drilling, test adits/trenches, in-situ tests (permeability, plate load, shear, Lugeon), laboratory tests, rock mass classification, geological cross-sections and longitudinal sections, design of foundation treatment, slope support and grouting, quantity of borrow materials |
| 4. Construction | Geological documentation of excavations (face mapping), checking design assumptions, revising support, treating unforeseen conditions such as faults or water inflow |
| 5. Operation / monitoring | Monitoring of slopes, seepage, settlement and instrumentation; maintenance and hazard review |
Detailed design phase in short: the main tasks are to confirm the foundation and abutment conditions, define geotechnical parameters for design (strength, deformability, permeability), delineate weak zones, decide excavation slopes and support, plan grouting/drainage, and locate and quantify construction materials.
✓ Answer checked by Claude Opus 5.5 (high effort)
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