Page 12 - Engineering Rock Mass Classification_ Tunnelling, Foundations and Landslides

Contents xi

18. Slope Mass Rating 231

The Slope Mass Rating 231
Slope Stability Classes 234
Support Measures 235
Modified SMR Approach 236
Case Study of Stability Analysis using Modified SMR Approach 238
Portal and Cut Slopes 238

19. Landslide Hazard Zonation 245

Introduction 245
Landslide Hazard Zonation Maps—The Methodology 246
A Case History (Gupta and Anbalagan, 1995) 251
Proposition for Tea Gardens 262
Geographic Information System 262
Mega-Regional Landslide Zonation 264

20. Allowable Bearing Pressure for Shallow Foundations 267

Introduction 267
A Classification for Net Safe Bearing Pressure 267
Allowable Bearing Pressure 269
Coefficient of Elastic Uniform Compression for Machine
273
Foundations 273
Scour Depth Around Bridge Piers 274
Rock Parameters to Select Type of Dam
281
21. Method of Excavation
281
Excavation Techniques 281
Assessing the Rippability 282
Rock Mass Classification According to Ease of Ripping 284
Empirical Methods in Blasting
287
22. Rock Drillability
287
Drillability and Affecting Parameters 288
Classification for Drilling Condition 291
Other Approaches
293
23. Permeability and Groutability
293
Permeability 293
Permeability of Various Rock Types 295
Permeability for Classifying Rock Masses 295
Permeability versus Grouting 295
Determination of Permeability 296
Grouting