IG Interpretation of Rock Properties

Information about IG Interpretation of Rock Properties

Published on September 20, 2007

Author: Peppar

Source: authorstream.com

Content

Interpretation ofRock Properties:  Interpretation of Rock Properties Chapter 10 Mount Pilatus, Switzerland Arches National Park, Utah Lesson 14 Objectives: Interpretation of Rock Properties :  Objectives: Interpretation of Rock Properties Be familiar with charts, equations, and tables for evaluation of rock properties Determine validity of rock test results Selection of appropriate values Perform preliminary design evaluation Recognize that cracks andamp; fissure in rock mass are as important as intact material between the discontinuities. Interpretation of Rock Properties:  Interpretation of Rock Properties Rock involved with highway construction: foundations, slopes, tunnels, and cuts. Two levels of rock classification: Intact Rock (origin, type, age, minerals) Rock Mass (discontinuities, joints, fissures) Combined lab and field test program Slide4:  Grand Canyon, Arizona Intact Rock Classification:  Intact Rock Classification Rock Type Geologic Formation and Age Indices: Specific Gravity, Porosity, Unit Weight, Wave Velocities Strength (compressive, tensile, shear) Elastic Modulus Major Rock Formations in USA:  Major Rock Formations in USA Primary Rock Types by Geologic Origin:  Primary Rock Types by Geologic Origin Sedimentary Types Metaphorphic Igneous Types Geologic Time Scale:  Geologic Time Scale Greenland Slide9:  Geologic Mapping of Rock Mass Features:  Geologic Mapping of Rock Mass Features Index Properties of Intact Rock:  Index Properties of Intact Rock Specific Gravity of Solids, Gs Unit Weight, g Porosity, n Ultrasonic Velocities (Vp and Vs) Compressive Strength, qu Tensile Strength, T0 Elastic Modulus, ER (at 50% of qu) Specific Gravity of Rock Minerals:  Specific Gravity of Rock Minerals Unit Weights of Rocks:  Unit Weights of Rocks Ultrasonic Velocities of Rocks:  Ultrasonic Velocities of Rocks Strength of Intact Rocks:  Strength of Intact Rocks Compressive Strength, su = qu (Direct) Tensile Strength, *T0 (Indirect) Brazilian Strength, T0 Shear Strength, t Across the intact rock Along the planar surface (joints) Lab Data on Intact Rocks (Goodman, 1989):  Lab Data on Intact Rocks (Goodman, 1989) Classification for Rock Material Strength:  Classification for Rock Material Strength Rock Strength Interrelationships:  Rock Strength Interrelationships tR = shear strength Intact Rock Strength Interrelationships:  Intact Rock Strength Interrelationships Intact Rock Classification:  Intact Rock Classification Classification by Uniaxial Compressive Strength, su Categorize Rock by its Strength and Modulus Ratio (ER/su) Summary plots for Igneous, Sedimentary, and Metamorphic Rock Types Check on reasonableness of your lab measurements and tests ER-qu Groups for Igneous Rocks:  ER-qu Groups for Igneous Rocks Deere and Miller (1966) ER-qu Groups for Sedimentary Rocks:  ER-qu Groups for Sedimentary Rocks Deere and Miller (1966) ER-qu Groups for Metamorphic Rocks:  ER-qu Groups for Metamorphic Rocks Deere and Miller (1966) EMAX-qu Groups for All Types of Geomaterials:  EMAX-qu Groups for All Types of Geomaterials (Tatsuoka and Shibuya, 1992) Illustrative Cases for Defining Rock ShearStrength for Cut Slope:  Illustrative Cases for Defining Rock Shear Strength for Cut Slope Slide26:  Rio de Janeiro, Brazil Rock Mass Classifications:  Rock Mass Classifications RQD - early form of rating rock mass Geomechanics System - Rock Mass Rating (RMR) by Bieniawski (1984, 1989) Q-System - Norwegian Geotechnical Institute (Barton, et al. 1974) Geological Strength Index, GSI (Hoek, et al., 1995) Rock Mass Rating (RMR):  Rock Mass Rating (RMR) RMR based on five parameters: Uniaxial strength, qu Rock Quality Designation, RQD Spacing of Discontinuities Condition of the Discontinuities Groundwater Conditions RMR = R1+R2+R3+R4+R5 Adjustment for Joint Orientation relative to construction Rock City Chattanooga, TN Slide29:  Rock Mass Rating (RMR) Geomechanics Systems (CSIR) [after Bieniawski, 1984, 1989] Slide30:  Rock Mass Rating (RMR) Geomechanics Systems (CSIR) [after Bieniawski, 1984, 1989] NGI- Q Rating of Rock Masses:  NGI- Q Rating of Rock Masses Q-Rating based on 6 parameters: Rock Quality Designation, RQD Number of Joint Sets, Jn Roughness of Discontinuities, Jr Discontinuity Condition/Filling, Ja Groundwater Conditions, Jw Stress Reduction Factor, SRF Rating of Rock Formation: Tucson, AZ Slide32:  Slide33:  Geological Strength Index, GSI:  Geological Strength Index, GSI Developed by Hoek, Kaiser, andamp; Bawden (1995), Hoek andamp; Brown (1997). GSI from Q-system: GSI from Geomechanics system where RMR andgt; 25: Chart approach based on structure andamp; surface quality GSI Evaluation from Chart:  GSI Evaluation from Chart Hoek (2000) Strength of Rock Masses:  Strength of Rock Masses Depends on Intact Rock Material and Rock Mass Jointing Intact Rock Uniaxial Compression Strength, qu = su Rock Material Type using parameter mi Fractured Rock Characteristics (in terms of GSI) Parameters mb and s and exponent 'a' Obtain Mohr-Coulomb Strength Envelope from: Rock Strength: mi parameter:  Rock Strength: mi parameter Strength of Fractured Rock Masses:  Strength of Fractured Rock Masses Parameter: mb = mi exp [(GSI-100)/28] For GSI andgt; 25: s = exp [(GSI-100)/9] exponent a = 0.5 For GSI andlt; 25: s = 0 exponent a = 0.65 - (GSI/200) Strength of Fractured Rock Masses:  Strength of Fractured Rock Masses Excel Spreadsheet of Generated Principal Stresses Strength of Fractured Rock Masses:  Strength of Fractured Rock Masses Strength of Fractured Rock Masses:  Strength of Fractured Rock Masses Strength of Rock Masses:  Strength of Rock Masses mi  Strength of Rock Masses:  Strength of Rock Masses mi c'/qu Attentione! Else you'll go to "the Rock":  Attentione! Else you'll go to 'the Rock' Deformation Properties of Fractured Rock Masses:  Deformation Properties of Fractured Rock Masses Equivalent Modulus of Rock Masses (Table 10-7):  Equivalent Modulus of Rock Masses (Table 10-7) Allowable Bearing Stresses on Rock Masses:  Allowable Bearing Stresses on Rock Masses Objectives: Interpretation of Rock Properties :  Objectives: Interpretation of Rock Properties Be familiar with charts, equations, and tables for evaluation of rock properties Determine validity of rock test results Selection of appropriate values Perform preliminary design evaluation Recognize that cracks andamp; fissure in rock mass are as important as intact material between the discontinuities. Slide49:  Mount Rainer, Washington

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