Lecture
This lecture provides an overview of the most common excavation techniques, including retaining walls, diaphragm walls, and sheet pile walls. It explains the factors to consider when choosing an excavation system, such as the presence of water, depth of excavation, soil type, and urban conditions. The lecture discusses the characteristics of cohesive and non-cohesive soils, the importance of the angle of repose, and how urban conditions can influence the choice of excavation technology.