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18-Env-A3 Geotechnical and Hydrogeological Engineering: December 2015

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

  1. Question 1 Index Properties from a Moist Soil Sample
  2. Question 2 Seepage Under a Dam with a Heel Cutoff — Flow Net
  3. Question 3 Aggregate Compaction — Quantity and Cost
  4. Question 4 Anisotropic Unconfined Aquifer — Well Drawdown
  5. Question 5 Rankine Active Force — Two-Layer Backfill with Water Table and Surcharge
  6. Question 6 Cantilever Retaining Wall — Active Force and Overturning Stability

Start with Question 1 →

National Exams — December 2015 — 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.) — weight–volume relations, compaction, lateral earth pressure and retaining-wall stability chapters; Craig & Knappett, Craig's Soil Mechanics (8th ed.) — seepage/flow-net theory and Rankine earth-pressure cross-reference; Freeze & Cherry, Groundwater (1979) — Darcy's law, anisotropic layered media and the Dupuit–Thiem equation for radial flow to a well.