What is the main purpose of boring holes in geotechnical exploration?

• A. A) Sampling
• B. B) In situ testing
• C. C) Layer thickness determination
• D. D) All of the above

Answer: (D)

The main purpose of boring holes in geotechnical exploration encompasses a variety of critical functions, all aimed at understanding the subsurface conditions of the site in question. When conducting geotechnical exploration, it is essential to gather detailed information about the soil and rock layers present, which can influence the design and construction of engineering projects.

One significant reason for boring is sampling, which involves collecting soil and rock specimens from different depths. These samples are analyzed in the laboratory to determine their physical and chemical properties, providing essential data for the design of foundations and other structures.

In situ testing is another vital aspect of boring operations. This testing can occur directly in the boreholes and helps assess the in-place properties of the materials without disturbing them. Tests such as Standard Penetration Tests (SPT), Cone Penetration Tests (CPT), and vane shear tests can yield crucial information on soil behavior under load.

Additionally, boring is used for determining layer thickness, which involves measuring the depth of various geological layers. Knowing the thickness of different soil and rock strata is key for engineers to evaluate how these layers interact under stress and how they contribute to overall site stability.

Together, these functions highlight that the process of boring holes is integral to comprehensive geotechnical investigations,