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Explain the various phase and tasks for the evaluation of EGS.

Engineering geological studies have to be performed in different phases of any civil engineering projects.For avoiding unnecessary and excessive investment of time and money in order to get the required geotechnical information,Engineering geological studies are done systematically in the following phases:

  • Project definition,

  • Feasibility,

  • Design,

  • Construction,

  • Maintenance

The various parameters studied for the evaluation of EGS are:

  • the lithology of the intact rock.

  • Tectonics of the area.

  • Structural geology of the area.

  • Mechanical and physical properties of the rock mass.

  • Hydrogeological condition of the area.

The main phases of evaluation of EGS and the respective engineering Geological tasks are:

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Phase
Task for study
Project definition
  • setting of the problem.
  • development of the project concept.
  • Preliminary information about regional geology, topography and climate.
pre-feasibility
  • Existing topographical maps, Aerial photo etc. observed to get regional geological information.
  • field inspection and preliminary geological survey of possible sites.
Feasibility
  • preparation of engineering geological maps (not in detail).
  • surface and subsurface site explorations.
  • estimation of the mechanical properties of the intact rocks and rock mass based on previous experience and some lab tests.
Design
  • Detail engineering geological mapping of selected sites.
  • Rock studies nad mapping of selected sites for stability analysis and design of the support system.
  • detail surface and subsurface exploration.
  • In-site as well as laboratory tests.
Construction
  • Exavation and construction works including the cuts, fills, tunneling, support system, etc.
  • continuous supervision.
maintenance
  • Regularinspection and monitoring of the sope stability after construction, stability of the excavated surface of the underground structures after excavation.
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