Manipulations of the sticky clays regarding EPB tunnel driving : G. Spagnoli M. Feinendegen R. Ernst
2012
Responsible for clogging are mainly adhesion
processes that occur at the interfaces and at the
surfaces of the clay minerals and tools (Spagnoli
et al. 2010a). For instance, according to Thewes
(1999), Feng (2004) and Weh et al. (2009), clays
which leads to clogging problems are high cohesive
with high liquid limits and a high plasticity index.
Hence, these types of soils tend to become very
sticky on contact with water, due to the swelling
effect of clay particles. Several solutions are present
on the market but not always their performances
are satisfactory. Besides, not always the chemomechanical properties of clays are well understood.
The clogging problem, therefore, remains an
important issue during the tunnel constructions.
Clogging can constrain mechanical tunnelling
through to a complete standstill.
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