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18-Env-A3 Geotechnical and Hydrogeological Engineering: May 2013

Nivaar worked solution (AI-drafted; not reviewed by a licensed engineer)

  1. Question 1 Aggregate Base Material — Moisture Content and Compacted Volume
  2. Question 2 Variable-Head Permeability Test
  3. Question 3 Seepage Under a Concrete Dam — Flow Net Analysis
  4. Question 4 Slope Stability of a Drainage Ditch — Taylor's Stability Chart
  5. Question 5 Rankine Active Force on a Retaining Wall — Two-Layer Sand with Groundwater and Surcharge
  6. Question 6 Confined Aquifer — Flow Rate and Tracer Travel Time

Start with Question 1 →

National Exams — May 2013 — 04-Env-A3 / Geotechnical & Hydrogeological Engineering. 3 hours duration; open book exam, any non-communicating calculator permitted. The first five questions as they appear in the answer book are marked (20 marks each, 100 marks total); all six are solved below for completeness.

Reference texts. Braja M. Das, Principles of Geotechnical Engineering (9th ed.) — unit weight/compaction relations, permeability and seepage/flow nets, lateral earth pressure and slope-stability chapters; Craig & Knappett, Craig's Soil Mechanics (8th ed.) — cross-reference for the variable-head permeability test and Taylor's stability-number chart; Freeze & Cherry, Groundwater (1979) — Darcy's law, confined-aquifer flow and seepage velocity.