The plasticity index (PI) of soil is a key parameter in determining the appropriate TBM type because it indicates the soil's cohesive properties and its tendency to become sticky or plastic when wet. The plasticity index is the numerical difference between the liquid limit (LL) and the plastic limit (PL) of a soil. A high PI suggests that the soil is highly plastic and will exhibit significant cohesion, meaning it tends to stick together. Soils with high PI values, such as clays, are prone to clogging the cutterhead and screw conveyor of....
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