Collecting Soil Data for HDD: The Role of Test Holes
Geotechnical contractors drill test holes at predetermined locations to gather soil samples, which are then classified according to the Unified Soil Classification System (USCS). This classification helps define the type of soil—whether granular or cohesive—that the HDD will encounter. The segment emphasizes the importance of strategically locating these test holes to obtain the most relevant information, as each test hole provides a profile of soil conditions at various depths, which is crucial for planning and executing the drilling process across the entire length of the drill path.
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