Untitled Flashcards Set

What are the main objectives of subsurface exploration?

Determine soil/rock stratigraphy, locate groundwater table, collect samples for lab testing, evaluate soil properties, identify hazards.

What is the difference between In-Situ and Ex-Situ Testing?

In-Situ testing is conducted on-site without removing the soil, while Ex-Situ testing occurs in laboratory after soil extraction.

What is the Standard Penetration Test (SPT)?

A test that measures the resistance to driving a split spoon sampler into the soil, used for determining soil density and strength.

What does the Proctor Test determine?

It identifies the optimum moisture content for soil compaction.

Name a common type of laboratory test used for fine-grained soils.

Hydrometer Analysis.

What is meant by 'Atterberg Limits'?

They are limits (plastic, liquid, shrinkage) that define the state transitions in fine-grained soils.

What is the purpose of site reconnaissance in site exploration?

To visually inspect the site for erosion, vegetation, and old structures, and to mark boring locations.

What is included in a geotechnical report?

Subsurface profiles & cross-sections, lab and field test data, groundwater observations, and recommendations for foundations, grading, etc.

What is Handy’s Rule regarding soil testing?

Match the cost of testing to the degree of uncertainty; uniform soils require fewer tests while variable soils may need many cheaper tests.

What is the Vane Shear Test used for?

To measure the undrained shear strength of soft clays.