Geophysics plays an important role in identifying subsurface conditions below ground. They act as a below-ground “camera” to capture different conditions that may be key to project designs or risk avoidance. They are non-destructive, relatively quick, and non-invasive. Often these methods are used to define subsurface conditions, identify cavities, map depth to bedrock, or aidContinue reading “Geotechnical Illustrated: Eyes Wide Open Below Ground”
Category Archives: Geotechnical Illustrated
Geotechnical Illustrated: Triaxial Testing in the 21st Century
The triaxial test is arguably the most widely used test method in investigating soils’ stress-strain behavior in geotechnical engineering. Its popularity is partially due to the well-understood state of stress during the test, as well as its versatility. In a triaxial test, the specimen is encased in a membrane with drainage from top and bottomContinue reading “Geotechnical Illustrated: Triaxial Testing in the 21st Century”
Geotechnical Illustrated: Sulfate Reducing Bacteria (SRB) – What is it?
Microbes live everywhere including the oceans. Sulfate-reducing bacteria (SRB) are considered microbes. SRB is one of many common bacteria species that live throughout our ecosystem. Seawater is a primary source of SRB where a single gallon of seawater has roughly a few billion different kinds of bacteria. While most bacteria are aerobic and require oxygenContinue reading “Geotechnical Illustrated: Sulfate Reducing Bacteria (SRB) – What is it?”
Geotechnical Illustrated: Good Vibrations or Not?
Heavy construction in densely populated cities can be conducted near neighboring buildings. Vibrations induced by such heavy construction are one of the most claimed causes of adjacent building damage. These vibrations can be generated by multiple types of equipment such as pavement breakers, excavators, or pile drivers. Such activities can generate short term vibrations orContinue reading “Geotechnical Illustrated: Good Vibrations or Not?”
Geotechnical Illustrated: What is your CPT Test Really Telling You?
In many cases with offshore filling construction, such as building and forming artificial islands in the middle of a body of water, borrow areas of suitable seabed materials must be first identified. A comprehensive soil investigation will subsequently help assess the suitability of the potential seabed borrow material to be dredged and used for engineeringContinue reading “Geotechnical Illustrated: What is your CPT Test Really Telling You?”
Geotechnical Illustrated: Risks of Spudcan Punch-through
Jack up rigs are used widely in offshore drilling and for offshore wind turbine installation. Such rigs can be often times supported by spudcan footings such as the ones shown below. However, there are multiple challenges in evaluating the capacity of such footings. Punch-through of spudcan legs for offshore barges is defined as rapid uncontrolledContinue reading “Geotechnical Illustrated: Risks of Spudcan Punch-through”