12 JULY 2025 WorldWide Drilling Resource® Geotechnical Drilling Methods Adapted from Information by ACS Services LLC For construction projects that involve building on or in the ground, geotechnical drilling plays a crucial role in obtaining samples to help engineers determine the strength, density, and composition of the soil and rock beneath the surface. The rotary drilling method, which involves rotating and hammering a drill bit into the ground, is the most commonly used drilling technique in geotechnical engineering to create a borehole. As the drill bit penetrates the soil, it creates cuttings that are brought to the surface for analysis. Rotary drilling is suitable for most soil types and can penetrate deep into the ground. Conventional air rotary can be used for small-diameter borings, clean outs, and abandonments. Geotechnical engineers often employ auger drilling, a method using a spiralshaped tool to penetrate the soil, extract soil, and conduct shallow soil sampling, although it is not suitable for hard rock. Another type of auger is the hollow stem auger used to case off over-burden while allowing soil sampling through the auger at depth. Coring is used to extract cylindrical samples of rock or soil using a diamondtipped core barrel, providing essential data for identifying rock types and determining their properties. In geotechnical engineering, several drilling techniques are used in addition to these methods, including air, sonic, and mud rotary drilling. Each method has its own set of advantages and disadvantages, which are selected based on a project’s specific requirements. Selecting the appropriate drilling method for a project involves considering several factors, such as soil and rock types, borehole depth, and the required level of detail and data. Geotechnical drilling is a precise and intricate process that demands skilled professionals with specialized training and experience. GEOTECH Coming Soon Be on the lookout for the 2026 Marketing Guide
RkJQdWJsaXNoZXIy NDk4Mzk=