What is the purpose of a geotechnical investigation in highway construction?

A geotechnical investigation serves a crucial role in highway construction by assessing subsurface conditions and material properties. This process involves drilling boreholes, taking soil and rock samples, and conducting laboratory tests to understand the physical and mechanical characteristics of the ground.

By analyzing the subsurface conditions, engineers can identify the types of soil and rock present, their strengths, pore water pressures, and other geotechnical parameters that influence construction. This information is essential for designing safe and effective roadways, as it helps determine factors such as the type of foundation needed, potential for ground settlement, drainage issues, and overall stability of the roadway structure.

Understanding the subsurface conditions is fundamental for any further design work, ensuring that the highway will be built on a solid, stable base, minimizing the risk of future settlement or failure. Thus, the focus on evaluating subsurface conditions and material properties underscores the importance of geotechnical investigations in promoting safe and durable highway construction.