44 FEBRUARY 2025 WorldWide Drilling Resource® The Purpose of Geotechnical Investigations Adapted from Information by the Kentucky Transportation Cabinet Geotechnical investigations provide vital information for developing optimal designs that balance cost and risk. By eliminating overly conservative parameters and minimizing underdesign, these investigations enable the identification of corrective actions and solutions for problems that arise during project construction and maintenance. Solutions can then be developed so construction or use of a facility can resume in a safe, reliable, economical, and efficient manner. These investigations may include drilling, sampling, geophysical testing, laboratory testing, as well as monitoring of soil and rock conditions. The findings of geotechnical investigations have a profound impact on the development of a project, its contract documents, construction processes, and long-term performance. Items influenced by geotechnical investigations include: j Design and construction requirements provide valuable information that influences roadway design, identifies potential subsurface issues, and outlines procedures that address them. j Right-of-way needs dictate the design of rock, soil cut, and embankment slopes and affect other right-of-way requirements. j When selecting a foundation for a structure, the type of foundation, whether pile or spread footing, is influenced by the structure’s foundation type, affecting the choice of pile type, foundation size or quantity, and the structure bearing on soil or bedrock. j Pavement design is influenced by the information provided on subgrade materials, including the need for treatment or stabilization, as well as the availability of rock from roadway excavation for subgrade construction. j Geohazards involve identifying potential hazards within the roadway footprint, such as caves, sinkholes, hazardous materials, and undesirable geologic formations. j Infrastructures designed for sustainability and weather resiliency supplies essential information to enhance resilience against various hazards, including floods, scour, erosion, earthquakes, and landslides. j Pay quantities offer valuable insights which influence the type and quantity of various pay items, such as rock excavation, common excavation, pile lengths, pile quantities, subgrade stabilization, retaining wall types, and foundation stabilization methods. j The absence of geotechnical investigation in long-term performance projects often leads to underdesign, causing poor performance, increased maintenance needs, safety concerns, loss of use, and higher life cycle costs. Understanding subsurface characteristics in areas beyond boring requires expertise in interpretation, interpolation, and inference. While other subsurface investigation techniques can bridge knowledge gaps, their application must consider budget, time, and benefits. Consequently, the expertise, knowledge, and judgement of a geotechnical professional are crucial in understanding subsurface data and mitigating project risk. Geotechnical investigations are tailored to each project’s unique characteristics, including type, size, geologic setting, and other factors. Engineers and geologists use available mapping and data to develop a well-planned investigation that minimizes risk. GEOTECH Time for a Little Fun! January Puzzle Solution: Win a prize! Send completed puzzle to: WWDR PO Box 660 Bonifay, FL 32425 fax: 850-547-0329 or e-mail: michele@ worldwidedrillingresource.com Place the five letters of the word on the left into the blanks on the right to form a common ten-letter word. ATTIC S _ _ T _ S _ I _ S ONION M _ _ I T _ R _ _ G TEAMS _ S S E S _ _ _ N _ CLAMP C O _ _ _ I _ N _ E TIGER _ E N _ _ A _ _ O N Congratulations to: Josh Ashley, Miller Supply Co., Cuthbert, GA Winner for January!
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