Chapter 2 Soils Investigation Soil Deposits Soils moved

Soil Deposits Soils moved from origin by: 1. Gravity- Landslides 2. Wind- carries fine

Field Research First step is research the area. Use what free resources from the

Methods of determining subsurface conditions include: ● Seismic - used mainly for oil exploration

Drill Rig The most common method is to use a drill rig. The rig

Field Research Example While driving the Shelby Tube for an undisturbed sample a Standard

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Chapter 2: Soils Investigation

Soil Deposits Soils moved from origin by: 1. Gravity- Landslides 2. Wind- carries fine grains 3. Water- alluvial deposits are soils formed by oceans, lakes, rivers, and bays 4. Glaciers- advancement and retreat of glaciers leaves soils called tills

Field Research First step is research the area. Use what free resources from the internet you can find. Look for: ● Maps - soils maps / geological maps ● Aerial pictures ● Visit site - look for ground water problems

Methods of determining subsurface conditions include: ● Seismic - used mainly for oil exploration ● Water Jetting - not reliable/used to locate utilities ● Test Pits ● Drill Test Holes

Drill Rig The most common method is to use a drill rig. The rig drills a 4” hole allowing sampling at various depths. Sample types: ● Augar samples - disturbed sample ● Split Spoon - disturbed sample ● Shelby Tube - undisturbed sample

Field Research Example While driving the Shelby Tube for an undisturbed sample a Standard Penetration Test is taken. The hammer blows are counted to penetrate 12” indicating density of the soil.

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