Page 7 - Rock Mechanics For Underground Mining

CONTENTS

4.3 Behaviour of isotropic rock material in uniaxial
compression 87
4.4 Behaviour of isotropic rock material in multiaxial
compression 99
4.5 Strength criteria for isotropic rock material 105
4.6 Strength of anisotropic rock material in triaxial compression 117
4.7 Shear behaviour of discontinuities 120
4.8 Models of discontinuity strength and deformation 130
4.9 Behaviour of discontinuous rock masses 133
Problems 139

5 Pre-mining state of stress 142
5.1 Specification of the pre-mining state of stress 142
5.2 Factors influencing the in situ state of stress 143
5.3 Methods of in situ stress determination 147
5.4 Presentation of in situ stress measurement results 156
5.5 Results of in situ stress measurements 159
Problems 161

6 Methods of stress analysis 165

6.1 Analytical methods for mine design 165
6.2 Principles of classical stress analysis 166
6.3 Closed-form solutions for simple excavation shapes 173
6.4 Computational methods of stress analysis 178
6.5 The boundary element method 179
6.6 The finite element method 183
6.7 The distinct element method 189
6.8 Finite difference methods for continuous rock 192
6.9 Linked computational schemes 195

7 Excavation design in massive elastic rock 197
7.1 General principles of excavation design 197
7.2 Zone of influence of an excavation 201
7.3 Effect of planes of weakness on elastic stress distribution 204
7.4 Excavation shape and boundary stresses 209
7.5 Delineation of zones of rock failure 213
7.6 Support and reinforcement of massive rock 217
Problems 221

8 Excavation design in stratified rock 224
8.1 Design factors 224
8.2 Rock mass response to mining 225
8.3 Roof bed deformation mechanics 227
8.4 Roof design procedure for plane strain 230
8.5 Roof beam analysis for large vertical deflection 235

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