There are four common methods for excavating a basement in construction. These methods include open-cut, top-down, diaphragm wall construction, and high rise buildings in urban areas often use the top-down method [1] [3] [4] [5] [6].

The open-cut method is one of the four common methods, and it involves excavating the soil to the desired depth and then constructing the basement walls and floor [5].

The top-down method is another common approach, which is often used in high-rise buildings in urban areas. In this method, the ground level is installed directly above where the basement will go before the basement is excavated. Some excavation companies will even finish construction on the building before they excavate the basement [2] [4].

Diaphragm wall construction is another basement excavation method, which is one of the three common methods compared in a blog [3].

It's important to note that bracing is a standard method for supporting the walls of excavation during basement construction, with timber shoring being one of the oldest and most common approaches [8].

However, the choice of excavation method depends on the nature of the project, and it is essential to consider factors such as soil conditions, the depth of the basement, and the surrounding structures before selecting a method [1] [6] [7].