The Delft Sand, Clay & Rock Cutting Model, 2019a

Exercises.
16.4.5. MC: Hyperbaric Rock Cutting.
Which material/environmental properties play a dominant role in the hyperbaric cutting of rock/stone?
The bold green answers are true.
1. The external friction coefficient of the rock.
2. The external shear strength or adhesion of the rock.
3. The external friction angle of the rock.
4. The hydrostatic pressure.
5. The permeability of the rock.
6. The tensile strength of the rock.
7. The shear strength or cohesion of the rock.
8. The internal friction angle of the rock.
16.5. Chapter 5: Dry Sand Cutting.
16.5.1. MC: Soil Mechanical Parameters.
Which of the following statements is true? The cutting of dry sand is:
The bold green answers are true.
1. Dominated by pore pressures.
2. Dominated by adhesion and cohesion.
3. Dominated by the permeability of the sand.
4. Dominated by the weight of the layer cut.
5. Influenced by the porosity of the sand.
6. Dominated by the inertial forces.
7. Influenced by the angle of external friction of the sand.
8. Dominated by the shear strength of the sand.
16.5.2. MC: The Shear Angle.
Which of the following statements are true in the case only the weight of the soil is considered if dry sand is
excavated with blade angles above 30º?
The bold green answers are true.
1. If the blade angle α increases, the shear angle β also increases.
2. If the angle of internal friction φ increases, the shear β angle also increases.
3. If the external friction angle δ increases, the shear β angle also increases.
4. If the blade angle α increases, the shear angle β decreases.
5. If the angle of internal friction φ increases, the shear angle β decreases.
6. If the external friction angle δ increases, the shear angle β decreases.
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