Nima Bahrami
Evaluation of the time course of the mechanical parameters of conditioned cohesionless soils.
Rel. Daniele Peila, Andrea Carigi, Gerardo Sorrentino. Politecnico di Torino, Corso di laurea magistrale in Petroleum And Mining Engineering (Ingegneria Del Petrolio E Mineraria), 2023
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Abstract
In the domain of mechanized tunneling, a substantial portion of the market is occupied by Earth Pressure Balance-Tunnel Boring Machines (EPB-TBM). Over recent decades, this technology has gained popularity due to several constraints such as limited space on the surface, noise and vibration concerns, and safety requirements. Ensuring efficient EPB-TBM operation necessitates a radical alteration in the rheological characteristics of excavated soil, achieving through soil conditioning. Soil conditioning is an indispensable aspect of EPB-TBM technology because it provides suitable soil for better pressure control within the bulk chamber and soil extraction with the screw conveyor. Furthermore, soil conditioning reduces both the internal friction angle and soil cohesion while enhancing material workability.
This transformation is achieved by introducing additives, such as foam, at the excavation face and within the bulk chamber, thus altering the natural soil properties from solid-like to fluid-like with a pulpy consistency
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