Mechanical behavior and damage fracture mechanism of deep rocks|RISS 상세보기

목차 (Table of Contents)

CONTENTS
1 Introduction = 1
1.1 Effect of Stress State on the Failure Mechanical Behavior
of Rocks = 1
1.2 Effect of Loading Path on the Failure Mechanical Behavior

CONTENTS
1 Introduction = 1
1.1 Effect of Stress State on the Failure Mechanical Behavior
of Rocks = 1
1.2 Effect of Loading Path on the Failure Mechanical Behavior
of Rocks = 5
1.3 Effect of High Temperature on the Failure Mechanical
Behavior of Rocks = 8
1.4 Damage Failure Mechanism of Rocks by AE and X-ray
CT Observations = 13
1.5 Main Contents in This Book = 14
References = 18
2 Strength, Deformation, Failure Behavior and Acoustic
Emission Locations of Red Sandstone Under Triaxial
Compression = 25
2.1 Experimental Material and Testing Procedures = 25
2.1.1 Experimental Materia = 25
2.1.2 Testing Equipment = 26
2.1.3 Testing Procedure = 27
2.1.4 AE Measuring Procedure = 28
2.2 Triaxial Experimental Results of Red Sandstone = 28
2.2.1 Deformation Behavior Under Conventional
Triaxial Compression = 28
2.2.2 Deformation Behavior in “reducing Confining
Pressure” Experiments = 32
2.2.3 Influence of the Confining Pressure
on the Deformation Parameters = 35
2.3 Triaxial Strength and Failure Behavior of Red Sandstone = 37
2.3.1 Peak Strength and Residual Strength Behavior = 37
2.3.2 Evaluation on Three Characteristics Stresses = 41
2.3.3 Failure Behavior Under Triaxial Compression = 43
2.4 Spatial AE Locations Behavior of Red Sandstone = 49
2.5 Conclusions = 51
References = 53
3 Mechanical Damage Characteristics of Red Sandstone Under
Triaxial Cyclic Loading = 55
3.1 Tested Rock Material and Testing Method = 56
3.1.1 Red Sandstone Material and Testing Equipment = 56
3.1.2 Two Types of Triaxial Tests = 57
3.2 Analysis of Triaxial Cyclic Experimental Results of Red
Sandstone = 59
3.2.1 Comparison Between Monotonic and Cyclic
Experimental Results = 59
3.2.2 Evolution of Crack Damage Threshold = 63
3.3 Mechanism of Mechanical Damage of Red Sandstone = 65
3.3.1 X-ray Micro CT Equipment and Scanning
Procedure = 65
3.3.2 Internal Damage of Sandstone Under Triaxial
Monotonic and Cyclic Loading = 67
3.4 Discussion on Evolution of Deformation Damage of Red
Sandstone = 76
3.5 Conclusions = 82
References = 83
4 Strength and Deformation Behavior of Red Sandstone Under
Simple and Complex Loading Paths = 85
4.1 Tested Rock Material and Testing Procedure = 85
4.1.1 Red Sandstone Material and Specimen Preparation = 85
4.1.2 Testing Equipment = 86
4.1.3 Designed Loading Paths = 87
4.2 Strength and Deformation Behavior of Red Sandstone
Under Simple Loading Path = 89
4.2.1 Deformation Behavior of Red Sandstone Under
Simple Loading Path = 89
4.2.2 Strength Behavior of Red Sandstone Under
Simple Loading Path = 92
4.2.3 Failure Mode of Red Sandstone Under Simple
Loading Path = 94
4.3 Strength and Deformation Behavior of Red Sandstone
Under Complex Loading Path A = 96
4.3.1 Deformation Behavior of Red Sandstone Under
Complex Loading Path A = 96
4.3.2 Strength and Failure Behavior of Red Sandstone
Under Complex Loading Path A = 100
4.4 Strength and Deformation Behavior of Red Sandstone
Under Complex Loading Path B = 103
4.4.1 Deformation Behavior of Red Sandstone Under
Complex Loading Path B = 103
4.4.2 Strength and Failure Behavior of Red Sandstone
Under Complex Loading Path B = 106
4.5 Discussion on Confirming Peak Strength Parameters
of Red Sandstone with One Specimen = 108
4.6 Conclusions = 113
References = 114
5 Mechanical, Acoustic, and Fracture Behaviors of Yellow
Sandstone Specimens Under Triaxial Monotonic and Cyclic
Loading = 115
5.1 Experimental Methodology = 115
5.1.1 Yellow Sandstone Material = 115
5.1.2 Testing System Description = 116
5.1.3 Experimental Procedure = 118
5.2 Strength and Deformation Behaviors of Yellow Sandstone = 120
5.2.1 Strength and Deformation Parameters Under
Triaxial Monotonic Loading Path = 120
5.2.2 Strength and Deformation Behavior Under
Triaxial Cyclic Loading Path = 126
5.3 Ultrasonic Velocity and AE Behaviors of Yellow Sandstone = 132
5.3.1 P-wave Velocity of Yellow Sandstone Under
Triaxial Monotonic Loading Path = 132
5.3.2 AE Characteristics of Yellow Sandstone Under
Triaxial Monotonic Loading Path = 134
5.3.3 AE Characteristics of Yellow Sandstone Under
Triaxial Cyclic Loading Path = 135
5.4 Fracture Propagation Behavior of Yellow Sandstone = 139
5.4.1 X-rary Micro-CT Scanning Procedure = 139
5.4.2 Surface Crack Characteristics of Yellow Sandstone = 140
5.4.3 Internal Crack Evolution of Yellow Sandstone = 142
5.5 Conclusions = 146
References = 147
6 Triaxial Strength and Deformation Failure Behavior of Coarse
Marble Under Six Different Loading Paths = 149
6.1 Experimental Methodology = 150
6.1.1 Coarse Marble Material and Specimen Preparation = 150
6.1.2 Testing Procedure for Six Different Loading Paths = 150
6.2 Mechanical Behavior of Intact Marble Under Different
Loading Paths (Paths I-II) = 152
6.3 Mechanical Behavior of Flawed Marble Under Different
Loading Paths (Paths III-VI) = 156
6.3.1 Mechanical Behavior of Flawed Marble Under
Path III = 161
6.3.2 Re-Fracture Mechanical Behavior of Flawed
Marble Under Path IV and V = 163
6.3.3 Re-Fracture Mechanical Behavior of Flawed
Marble Under Path VI = 167
6.4 Conclusions = 173
References = 174
7 Deformation Failure Characteristics of Crystalline Marble
Under Triaxial Cyclic Loading = 177
7.1 Crystalline Marble and Testing Procedure = 178
7.1.1 Crystalline Marble Material and Specimen
Preparation = 178
7.1.2 Two Types of Triaxial Tests = 179
7.2 Experimental Results of Crystalline Marble Under Triaxial
Monotonic Loading = 183
7.3 Triaxial Experimental Results of Crystalline Marble Under
Simple Cyclic Loading = 186
7.3.1 Effect of Cyclic Number and Unloading Stress
Level on the Strain Behavior = 187
7.3.2 Evolution of Elastic Modulus of Crystalline
Marble with Cyclic Number = 189
7.4 Triaxial Experimental Results of Crystalline Marble Under
Complex Cyclic Loading = 193
7.4.1 Elastic Modulus of Crystalline Marble Under
Complex Cyclic Loading = 195
7.4.2 Peak Strength of Crystalline Marble Under
Complex Cyclic Loading = 197
7.5 Conclusions = 200
References = 201
8 Strength, Deformability and X-ray Micro CT Observations
of Deeply-Buried Marble Under Different Confining Pressures = 203
8.1 Deeply-Buried Marble Material and Testing Procedure = 205
8.2 Strength and Deformation Behavior of Deeply-Buried
Marble = 206
8.2.1 Uniaxial Compression and Tensile Failure
Behavior of Deeply-Buried Marble = 206
8.2.2 Triaxial Strength and Deformation Behavior
of Deeply-Buried Marble = 207
8.3 X-ray Micro CT Observations of Deep-Buried Marble = 211
8.4 Discussion on Failure Mechanism of Deep-Buried Marble = 216
8.5 Conclusions = 224
References = 225
9 Deformation and Damage Failure Behaviour of Mudstone
Specimens Under Single-Stage and Multi-stage Triaxial
Compression = 229
9.1 Experimental and Numerical Methodology = 230
9.1.1 Mudstone Material and Testing Equipment = 230
9.1.2 Single-Stage and Multi-stage Triaxial
Compression = 231
9.1.3 Numerical Model and Micro-parameters in PFC = 234
9.2 Mechanical Behaviour of Mudstone Under Single-stage
Triaxial Compression = 236
9.3 Mechanical Behaviour of Mudstone Under Multi-stage
Triaxial Compression = 238
9.4 Discussion of the Damage Evolution Mechanism
of Mudstone = 241
9.5 Conclusions = 248
References = 248
10 Deformation, Peak Strength and Crack Damage Behavior
of Hollow Sandstone Under Conventional Triaxial
Compression = 251
10.1 Hollow Sandstone and Testing Procedure = 252
10.1.1 Sandstone Material and Hollow Specimen
Preparation = 252
10.1.2 Testing Equipment and Procedure = 253
10.2 Deformation Behavior of Hollow Sandstone = 253
10.2.1 Determination of Deformation Parameters = 255
10.2.2 Influence of Confining Pressure
on the Deformation Behavior = 258
10.3 Peak Strength Behavior of Hollow Sandstone = 263
10.4 Crack Damage Behavior of Hollow Sandstone = 269
10.4.1 Axial Deviatoric Stress-Volumetric Strain Curve = 269
10.4.2 Influence of Hole Diameter on Crack Damage
Behavior = 270
10.4.3 Influence of Confining Pressure on Crack Damage
Behavior = 272
10.5 Conclusions = 275
References = 276
11 Fracture Evolution Mechanism of Hollow Sandstone Under
Conventional Triaxial Compression by X-ray Micro-CT
Observations and Three-Dimensional Numerical Simulations = 279
11.1 Hollow Sandstone and X-ray Micro-CT Scanning
Procedure = 281
11.1.1 Hollow Sandstone Specimen and Mechanical
Testing Procedure = 281
11.1.2 X-ray Micro-CT Scanning Procedure = 282
11.2 Three-Dimensional Numerical Simulation Methodology = 282
11.2.1 Representative Volume Element Based
on the RFPA3D Method = 283
11.2.2 Damage Evolution of the RVE = 283
11.2.3 Three-Dimensional Numerical Model = 285
11.3 Mechanical Behavior of Hollow Sandstone
by Three-Dimensional Numerical Simulations = 288
11.3.1 Confirmation of the Micro-Parameters Based
on the Intact Specimen = 288
11.3.2 Comparison Between the Numerical Simulated
and Experimental Results = 290
11.4 Fracture Evolution Mechanism of Hollow Sandstone
Under Different Confining Pressures = 294
11.4.1 Internal Crack Mechanism of Intact Sandstone = 296
11.4.2 Internal Crack Mechanism of Hollow Sandstone
with Various Borehole Diameters = 300
11.4.3 Effect of Borehole Size on Fracture Evolution
Mechanism of Hollow Sandstone = 305
11.5 Interpretations and Discussions on the Fracture Mechanism
of Hollow Sandstone = 310
11.5.1 Interpretations on Effect of Borehole Diameter
on the Peak Strength = 310
11.5.2 Discussions on the Effect of Confining Pressure
for 3D Fracture Mechanism = 313
11.6 Conclusions = 315
References = 316
12 Fracturing Mechanism of Compressed Hollow-Cylinder
Sandstone Evaluated by X-ray Micro CT Scanning = 319
12.1 Sandstone Material and Testing Procedure = 320
12.1.1 Experimental Materia = 320
12.1.2 Mechanical Testing Equipment and Procedure = 320
12.1.3 X-ray Micro CT Scanning Procedure = 321
12.2 Mechanical Behaviour of Compressed Hollow-Cylinder
Sandstone = 321
12.3 Internal Damage Failure Behaviour of Compressed
Hollow-Cylinder Sandstone = 324
12.3.1 Internal Damage Failure Behaviour Before
the Peak Strength = 324
12.3.2 Internal Damage Failure Behaviour After the Peak
Strength = 328
12.3.3 Effect of Borehole Size on Internal Damage
Behaviour After the Peak Strength = 334
12.4 Discussion on the Fracturing Mechanism
of Hollow-Cylinder Sandstone = 337
12.4.1 Three-Dimensional Reconstruction of X-ray CT
Images = 337
12.4.2 Discussion on Fracturing Mechanism
of Hollow-Cylinder Sandstone = 339
12.5 Conclusions = 341
References = 342
13 Thermal Damage and Failure Mechanical Behavior of Granite
After Exposure to Different High Temperature Treatments
Under Uniaxial Compression = 345
13.1 Experimental Material and Testing Procedure = 345
13.1.1 Granite Material = 345
13.1.2 Mineral Composition of Granite = 346
13.1.3 Mechanical Testing and AE Procedure = 347
13.2 Thermal Damage Characteristics of Granite Before Loading = 348
13.2.1 X-ray Micro CT Scanning Procedure = 348
13.2.2 Thermal Damage Characteristics by CT
and Optical Microscopic Observation = 349
13.3 Strength and Deformation Behavior of Granite Under
Uniaxial Compression = 354
13.3.1 Axial Stress-strain Behavior of Granite = 354
13.3.2 Effect of Temperature on Strength
and Deformation Parameters of Granite = 356
13.4 AE Behavior of Granite During Uniaxial Compression = 359
13.5 Internal Crack Mechanism of Granite Under Uniaxial
Compression = 363
13.6 Conclusions = 369
References = 371
14 Triaxial Mechanical and Permeability Behavior of Sandstone
After Exposure to Different High Temperature Treatments = 373
14.1 Experimental Material and Testing Procedure = 374
14.1.1 Sandstone Material and Heating Procedure = 374
14.1.2 Measurement of Physical Properties = 374
14.1.3 Conventional Triaxial Compression and Seepage
Testing Procedure = 375
14.1.4 Brazilian Testing Procedure = 376
14.1.5 Equipment for XRD and SEM Analysis = 377
14.2 Results of Basic Physical Tests of Sandstone Specimen
After Thermal Treatment = 377
14.2.1 Effect of Temperature on Weight, Volume
and Bulk Density of Sandstone = 377
14.2.2 Effect of Temperature on Dynamic Parameters
of Sandstone = 380
14.3 Results of Mechanical Experiments of Sandstone
Specimens After Thermal Treatment = 382
14.3.1 Stress-strain Curves of Sandstone Under
Conventional Triaxial Compression = 382
14.3.2 Effect of Temperature on the Strength
and Deformation Parameters of Sandstone = 382
14.3.3 Effect of Temperature on the Failure Behavior
of Sandstone = 389
14.3.4 Effect of Temperature on the Tensile Strength
of Sandstone = 391
14.4 Results of Permeability Experiments on Sandstone
Specimens Exposed to Heat Treatment = 393
14.4.1 Permeability Evolution of Sandstone Under
Conventional Triaxial Compression = 393
14.4.2 Effect of Confining Pressure on Permeability
Behavior of Sandstone = 394
14.4.3 Effect of Temperature on the Permeability
Behavior of Sandstone = 395
14.5 Results of SEM and XRD Analysis = 397
14.5.1 Effect of Temperature on the Material
Composition of Sandstone = 397
14.5.2 Effect of Temperature on the Micro-Structure
of Sandstone = 399
14.6 Conclusions = 401
References = 403
15 Effect of High Temperature on the Permeability Evolution
and Failure Response of Granite Under Triaxial Compression = 405
15.1 Experimental Methodology = 405
15.1.1 Granite Material = 405
15.1.2 Permeability Testing System and Procedure = 406
15.1.3 Mechanical Testing System and Procedure = 408
15.2 Effect of High Temperature on the Physical Behavior
and Permeability Evolution of Granite = 410
15.2.1 Effect of High Temperature on the Physical
Behavior of Granite = 410
15.2.2 Effect of High Temperature on Permeability
Evolution of Granite Under Triaxial Compression = 413
15.3 Effect of High Temperature on Triaxial Deformation
and AE Behavior of Granite = 417
15.3.1 Effect of High Temperature on Triaxial Stress-
Strain Curves of Granite = 417
15.3.2 Effect of High Temperature on Triaxial
Deformation Parameters of Granite = 421
15.3.3 Effect of High Temperature on the AE and Failure
Behavior of Granite = 424
15.4 Effect of High Temperature on Strength Behavior
of Granite Under Triaxial Compression = 427
15.4.1 Effect of High Temperature on Peak Strength
Behavior of Granite = 427
15.4.2 Effect of High Temperature on the Crack Damage
Threshold of Granite = 428
15.4.3 Effect of High Temperature on Hoek-Brown
Criterion Strength Parameters of Granite = 430
15.4.4 Mechanistic Control of High-Temperature Effects
on Strength and Permeability of Granite = 432
15.5 Conclusions = 434
References = 435
16 Experiment and Grain-Based Modelling on Damage Failure
Behaviour of Granite Under Different Confining Pressures = 439
16.1 Granite Material and Testing Procedure = 441
16.1.1 Tested Granite Materia = 441
16.1.2 Mechanical Testing, AE and X-ray CT Scanning
Procedure = 442
16.2 Experimental Results on Damage Failure Behaviour
of Granite = 443
16.2.1 Effect of Confining Pressure on Peak Strength
and Crack Damage Threshold = 444
16.2.2 Effect of Confining Pressure on Deformation
Parameters and Failure Characteristics = 446
16.3 Grain-Based Modeling on Damage Failure Behaviour
of Granite = 448
16.3.1 Grain-Based Modelling Procedure = 448
16.3.2 Calibrating Micro-parameters by Experimental
Results = 451
16.4 Discussion on Damage Fracture Mechanism of Granite = 456
16.4.1 Spatial AE Behaviour of Granite Under Different
Confining Pressures = 456
16.4.2 Internal Crack Characteristics of Granite Under
Triaxial Compression = 460
16.4.3 Internal Crack Evolution Mechanism of Granite
During Triaxial Compression = 465
16.5 Conclusions = 466
References = 469
17 Strength and Failure Behavior of Coal Specimens
with Different Diameters Under Conventional Triaxial
Compression = 473
17.1 Experimental Results of Coal Specimens with Different
Diameters = 476
17.2 Numerical Model and Micro-parameters for Coal Specimen = 479
17.2.1 Numerical Model for Coal Specimen = 479
17.2.2 Micro-parameters for Coal Specimen = 480
17.3 Failure Behaviors of Coal Specimens with Different
Diameters = 481
17.3.1 Numerical Stress-Strain Curves of Coal Specimen
with Different Diameters = 482
17.3.2 Failure Behavior of Coal Specimens Under
Different Confining Pressures = 485
17.3.3 Comparison Between Numerical and Experiment
Results of Coal Specimens = 486
17.4 Strength Behaviors of Coal Specimens with Different
Diameters = 487
17.4.1 Strength Parameters of Coal Specimens
with Different Diameters = 488
17.4.2 A New Evaluation Criterion Based on Optimal
Approximation Polynomial Theory = 493
17.5 Conclusions 498
References = 499

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