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

The Delft Sand, Clay & Rock Cutting Model.
8.3.3. The Model of Evans used for a Pick point. ....................................................................................266
8.3.4. Summary of the Evans Theory. ......................................................................................................267
8.3.5. The Nishimatsu Model. ..................................................................................................................269
8.4. The Flow Type (Based on the Merchant Model). .................................................................. 273
8.5. Determining the Angle β. ...................................................................................................... 276
8.6. The Shear Type, Tear Type and the Chip Type. .................................................................... 279
8.7. Correction on the Tear Type and the Chip Type. .................................................................. 287
8.8. Specific Energy. .................................................................................................................... 289
8.9. Resulting Forces & Mohr Circles. ......................................................................................... 291
8.10. Example. ................................................................................................................................ 294
8.10.1. Step 1: Brittle Shear. ..................................................................................................................294
8.10.2. Step 2: The Transition Brittle Shear/Brittle Tensile. ..................................................................294
8.10.3. Step 3: Applying Tensile Strengths of -5 MPa, -10 MPa and -25 MPa. ....................................295
8.11. Nomenclature. ....................................................................................................................... 295
Chapter 9: Rock Cutting: Hyperbaric Conditions. ..................................................................................297
9.1. Introduction. .......................................................................................................................... 297
9.2. The Flow Type and the Crushed Type. ................................................................................. 299
9.3. The Tear Type and the Chip Type. ........................................................................................ 305
9.4. The Curling Type. ................................................................................................................. 305
9.5. Experiments of Zijsling (1987).............................................................................................. 312
9.6. Specific Energy. .................................................................................................................... 317
9.7. Example. ................................................................................................................................ 318
9.8. Specific Energy Graphs. ........................................................................................................ 319
9.9. Nomenclature. ....................................................................................................................... 322
Chapter 10: The Occurrence of a Wedge. ...................................................................................................325
10.1. Introduction. .......................................................................................................................... 325
10.2. The Force Equilibrium. ......................................................................................................... 326
10.3. The Equilibrium of Moments. ............................................................................................... 331
10.4. Nomenclature. ....................................................................................................................... 332
Chapter 11: A Wedge in Dry Sand Cutting. ...............................................................................................333
11.1. Introduction. .......................................................................................................................... 333
11.2. The Force Equilibrium. ......................................................................................................... 334
11.3. The Equilibrium of Moments. ............................................................................................... 337
11.4. Results of some Calculations. ................................................................................................ 339
11.5. Experiments of Hatamura & Chijiiwa (1977B)..................................................................... 341
11.6. Nomenclature. ....................................................................................................................... 343
Chapter 12: A Wedge in Saturated Sand Cutting. .....................................................................................345
12.1. Introduction. .......................................................................................................................... 345
12.2. The Equilibrium of Forces. .................................................................................................... 347
12.3. Pore Pressures. ....................................................................................................................... 349
12.4. The Equilibrium of Moments. ............................................................................................... 357
12.5. The Non-Cavitating Wedge. .................................................................................................. 360
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