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Shear Behaviour of Rock Joints - Asadul Haque

Shear Behaviour of Rock Joints

Hardcover Published: 1st January 2000
ISBN: 9789058093073
Number Of Pages: 200

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This book covers in detail, the fundamental properties of rock joints, the methods of laboratory testing of rock joints, and shear strength assessment under different loading conditions. Various methods of testing and analysis developed previously have been compared where warranted, and modifications based on author's research findings are included. The use of the Constant Normal Stiffness method for analysing the behaviour of rock joints and representing the laboratory response in terms of stress paths are discussed in depth. A new shear strength model developed by the authors using a mathematical approach is also highlighted, with simplified practical applications. The book is intended as a reference text for both undergraduate thesis students, postgraduate researchers and for practitioners in mining and rock engineering.

Prefacep. IX
Characterization of Joint Surface Roughnessp. 1
Introductionp. 1
Roughness measurement techniquesp. 2
JRC measurementp. 2
Fractal methodp. 4
Spectral methodp. 9
Digital coordinate measuring machinep. 11
Fourier transform method and its application to measure surface rougnessp. 14
Physical and mechanical properties of intact and jointed rocksp. 15
Referencesp. 16
Shear Behaviour of Clean Rock Jointsp. 17
Introductionp. 17
CNS and CNL conceptsp. 18
Shear apparatus for laboratory testingp. 21
Large scale shear boxesp. 21
Loading devicep. 21
Measurements of displacementsp. 22
Laboratory modelling of rock jointsp. 23
Selection of model material for jointp. 23
Preparation of saw-tooth and natural specimensp. 23
Sampling and preparation of field joint specimensp. 24
Laboratory testing of rock jointsp. 25
Shear strength response under Constant Normal Stiffnessp. 26
Normal stress and dilation behaviourp. 27
Effect of normal stiffness on joint shear behaviourp. 28
Effect of stiffness on shear displacement corresponding to peak shear stressp. 28
Effect of shear rate on the strength of jointp. 28
Tests on soft rock jointsp. 29
Effect of shear displacement ratep. 29
Effect of boundary condition on shear behaviourp. 31
Behaviour of unfilled/clean regular joints under CNSp. 36
Shear behaviour of natural (field) jointsp. 37
Stress-path response of Type I, II and III jointsp. 42
Strength envelopes for Types I, II and IIIp. 44
Empirical models for the prediction of shear strength of rock jointsp. 45
Summary of behaviour of unfilled/clean jointsp. 49
Effect of shear rate on shear behaviour of joints under CNSp. 49
Effect of boundary condition on shear behaviourp. 50
Shear behaviour of soft unfilled joint under CNSp. 51
Referencesp. 51
Infilled Rock Joint Behaviourp. 54
Influence of infill on rock joint shear strengthp. 54
Factors controlling infilled joint shear strengthp. 55
Effect of joint type on shear behaviourp. 56
Infill type and thicknessp. 56
Effect of drainage conditionp. 63
Infill boundary conditionp. 63
Infill-rock interactionp. 64
Effect of external stiffnessp. 67
Normal stress and lateral confinementp. 68
Laboratory testing on infilled rock jointsp. 68
Selection of infill materialp. 70
Preparation of infilled joint surfacep. 70
Setting-up the specimen in the shear boxesp. 71
Application of normal loadp. 71
Shear behaviour of Type I jointsp. 74
Shear behaviour of Type II jointsp. 77
Effect of infill thickness on horizontal displacement corresponding to peak shear stressp. 77
Effect of infill thickness on stress-path behaviourp. 81
Effect of infill thickness on peak shear stressp. 83
Drop in peak shear strengthp. 83
Strength envelopep. 87
Shear strength model for infilled jointsp. 87
Remarks on infilled joint behaviourp. 90
Referencesp. 91
Modelling the Shear Behaviour of Rock Jointsp. 93
Introductionp. 93
Existing models based on CNS conceptp. 94
Model based on energy balance principlesp. 94
Mechanistically based modelp. 97
Graphical modelp. 98
Analytical modelp. 98
Requirement of a new modelp. 102
New shear strength model for soft rock jointsp. 102
Application of Fourier transform method for predicting unfilled joint dilationp. 102
Prediction of normal stress with horizontal displacementp. 104
Prediction of shear stress with horizontal displacementp. 105
Effect of infill on the shear strength of jointp. 113
Hyberbolic modelling of strength drop associated with infill thicknessp. 113
Shear strength relationship between unfilled and infilled jointsp. 115
Determination of hyperbolic constantsp. 115
Development of a computer codep. 119
Comparison between predicted and experimental resultsp. 119
Dilationp. 119
Normal stressp. 119
Shear stressp. 124
Strength envelopesp. 126
Infilled joint strengthp. 127
UDEC analysis of shear behaviour of jointsp. 127
Choice of joint modelsp. 127
Continuous yielding modelp. 131
Conceptual CNS shear modelp. 132
CNL direct shear modelp. 133
Discretisation of blocks and applied boundary conditionsp. 133
Results and discussionsp. 135
Summary of shear strength modellingp. 137
Referencesp. 138
Simplified Approach for Using CNS Technique in Practicep. 140
Introductionp. 140
Underground roadway in jointed rockp. 140
Boundary conditionsp. 140
Roadway excavationp. 141
Stability analysis of slopep. 143
Limit equilibrium analysis (initial condition without bolts)p. 145
CNS analysis (considering bolt contribution)p. 146
CNL analysis considering joint contributionp. 147
Highlights of Rock Joint Behaviour Under CNL and CNS Conditions, and Recommendations for the Futurep. 149
Summaryp. 149
Behaviour of unfilled joints under various rates of shear displacementsp. 150
Behaviour of unfilled joints under CNL and CNSp. 150
Shear behaviour of unfilled and natural joints under CNSp. 150
Behaviour of unfilled joints under CNS conditionp. 151
New shear strength model by the authorsp. 151
Recommendations for further studyp. 152
Modifications to laboratory proceduresp. 152
Field mappingp. 152
Effective stress approachp. 152
Bolted jointsp. 153
Scale effectsp. 153
Extension in numerical modellingp. 154
Referencesp. 154
Program Code for Shear Strength Modelp. 155
Subject Indexp. 163
Table of Contents provided by Syndetics. All Rights Reserved.

ISBN: 9789058093073
ISBN-10: 9058093077
Audience: Professional
Format: Hardcover
Language: English
Number Of Pages: 200
Published: 1st January 2000
Publisher: CRC PR INC
Country of Publication: NL
Dimensions (cm): 24.77 x 17.78  x 1.91
Weight (kg): 0.53
Edition Number: 1

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