Final answer:
A detailed geotechnical investigation is crucial for assessing soil and rock conditions, planning infrastructure development, and identifying potential environmental impacts to ensure safety and project feasibility.
Step-by-step explanation:
It is essential for a detailed geotechnical investigation to be carried out once the route has been staked for several critical reasons. First, such an investigation is vital to assess soil and rock conditions, which can significantly impact the safety, feasibility, and design of infrastructure projects. Understanding the geological materials present and their properties helps in designing foundations and other structural supports. Second, geological investigations provide information to plan infrastructure development effectively, ensuring that the design of roads, buildings, and other structures accounts for the natural terrain and subsurface conditions, thereby reducing the risk of future problems. Third, by identifying potential environmental impacts, stakeholders can ensure that the project adheres to environmental regulations and minimizes harm to the surrounding ecosystem. Additionally, understanding the economic feasibility of the proposed project is beneficial in decision-making and planning. For example, if a geotechnical investigation reveals unforeseen subsoil complications that would make construction prohibitively expensive, stakeholders can explore alternative routes or entirely different projects.