Key Data to Request in Geotechnical Investigations for HDD
In geotechnical investigations for Horizontal Directional Drilling (HDD), key data include soil identification, rock presence, grain size distribution for granular soils, and the percentage of gravel. The Standard Penetration Test (SPT) is used to measure soil density, while rock core samples assess rock quality and hardness. Groundwater levels and moisture content are also critical, especially for cohesive soils like clays. If a borehole stability analysis is required, additional tests for soil friction angle, shear modulus, and cohesion coefficient are needed. Ensure these requirements are specified to the geotechnical contractor, who will follow ASTM standards for testing.
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