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Title of Journal: Rock Mech Rock Eng

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Abbravation: Rock Mechanics and Rock Engineering

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Publisher

Springer Vienna

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DOI

10.1002/ncr.4110030121

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ISSN

1434-453X

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Numerical Assessment of the Progressive Rock Fract

Authors: F Dai M D Wei N W Xu Y Ma D S Yang
Publish Date: 2014/04/22
Volume: 48, Issue: 2, Pages: 463-479
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Abstract

The International Society of Rock Mechanics ISRM suggested cracked chevron notched Brazilian disc method falls into a major testing category of rock fracture toughness measurement by virtue of chevron notched rock samples A straight through crack front during the whole fracturing process is assumed in the testing principle but is never assessed In this study the progressive rock fracture mechanism of cracked chevron notched Brazilian disc rock specimens is numerically simulated for the first time Two representative sample types with distinct geometry of notch ligaments are modelled The assumption of a straight through crack front for chevron notched fracture samples is critically assessed The results show that not only the notch tip but also the sawcut chevron notch cracks during the experiments The straight through crack front assumption is never satisfied in the realistic rock fracture progress of chevron notched disc samples In addition the crack features prominent curved front far from being straight In contrast to the sample type with narrow notch ligament the acoustic emission AE of the simulation on the sample with wide notch ligament depicts obvious biased fracturing of the prescript fracturing route of the notch The numerically observed progressive fracture mechanism calls for more attention on how to accurately calibrate the critical dimensionless stress intensity factor for a better measurement of Mode I fracture toughness via chevron notched samplesThe authors are grateful for the financial support from the National Natural Science Foundation of China Nos 51374149 and 51209127 the Program for New Century Excellent Talents in University NCET130382 and the Doctoral Fund of Ministry of Education of China No 20130181110044


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Other Papers In This Journal:

  1. Development of Rock Engineering Systems-Based Models for Flyrock Risk Analysis and Prediction of Flyrock Distance in Surface Blasting
  2. Borehole Instability in Malmberget Underground Mine
  3. The Use of Infrared Thermography for Porosity Assessment of Intact Rock
  4. A nonlinear criterion for triaxial strength of inherently anisotropic rocks
  5. Modeling of Shales in Salt-Hydrocarbon Systems
  6. An Example of Realistic Modelling of Rock Dynamics Problems: FEM/DEM Simulation of Dynamic Brazilian Test on Barre Granite
  7. Comprehensive Stability Evaluation of Rock Slope Using the Cloud Model-Based Approach
  8. Wear Performance of Saw Blades in Processing of Granitic Rocks and Development of Models for Wear Estimation
  9. Determination of Poisson’s Ratio of Rock Material by Changing Axial Stress and Unloading Lateral Stress Test
  10. Hollow Cylinder Simulation Experiments of Galleries in Boom Clay Formation
  11. Micromechanical Modelling of Stress Waves in Rock and Rock Fractures
  12. ISRM Suggested Method for Monitoring Rock Displacements Using the Global Positioning System (GPS)
  13. Determination of Geometrical and Structural Representative Volume Elements at the Baihetan Dam Site
  14. Determination of Geometrical and Structural Representative Volume Elements at the Baihetan Dam Site
  15. Microseism Induced by Transient Release of In Situ Stress During Deep Rock Mass Excavation by Blasting
  16. Some Open Issues on Rockfall Hazard Analysis in Fractured Rock Mass: Problems and Prospects
  17. Connectivity of Three-Dimensional Fracture Networks: A Case Study from a Dam Site in Southwest China
  18. Evaluating Variability and Uncertainty of Geological Strength Index at a Specific Site
  19. Hybrid Finite-Discrete Element Simulation of the EDZ Formation and Mechanical Sealing Process Around a Microtunnel in Opalinus Clay
  20. Experimental Anelastic Strain Recovery Compliance of Three Typical Rocks
  21. Significance of Geological Parameters for Predicting Water Inflow in Hard Rock Tunnels
  22. A Morphological Visualization Method for Removability Analysis of Blocks in Discontinuous Rock Masses
  23. Analysis of the Thermal and Hydraulic Stimulation Program at Raft River, Idaho
  24. Effects of Heat Shock on the Dynamic Tensile Behavior of Granitic Rocks
  25. New Rapid Evaluation for Long-Term Behavior in Deep Geological Repository by Geotechnical Centrifuge. Part 1: Test of Physical Modeling in Near Field Under Isotropic Stress-Constraint Conditions
  26. Slope Failures in the Opencast Coal Mines of Wardha Valley Coalfield in Central India: A Study
  27. System Reliability Assessment for a Rock Tunnel with Multiple Failure Modes
  28. Algorithmic Simulation of Flow in Rock Fractures

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