ABSTRACT
The Traditional Method of Madrid (TMM), also known as Belgian Method, is a method for tunnel construction. This method uses a unique excavation sequence in which the crown is divided into a series of pocket excavations which are successively supported using temporary works, and then quickly followed by the permanent lining construction. Due to the complexity of the multiple phases and structures involved, this type of tunnel needs a 3D Soil Structure Interaction (SSI) model to correctly capture all the elements and their contributions, however, a 3D model is not always possible due to project constraints, such as budget and deadlines. This paper aims, firstly, to enhance the current design approaches, via a new 2D approach based on a calibration with a 3D SSI model; secondly, to contribute for a more informed design when a 3D model is not available; and thirdly, to contribute to more sustainable designs without compromising safety and quality.
