Wear of rock cutting tools : laboratory experiments on the abrasivity of rock

목차 (Table of Contents)

• CONTENTS
• Preface = Ⅷ
• 1 Introduction = 1
• 2 Rock cutting theories = 4
• 3 Possible wear mechanisms at the wear-flat of rock cutting tools = 7
• 3.1 Introduction = 7
• 3.2 Wear type classifications = 8
• 3.2.1 The motion category classification = 8
• 3.2.2 The wear mechanism classification = 8
• 3.3 Wear mechanisms relevant to rock cutting tools = 10
• 3.3.1 Abrasive wear = 11
• 3.3.2 Adhesive wear = 14
• 3.3.3 Sliding wear = 16
• 3.3.4 Total wear due to sliding motion contact = 16
• 4 Wear mode hypothesis = 18
• 4.1 Introduction = 18
• 4.2 Cutting forces = 18
• 4.2.1 Influences of rock material properties on cutting forces = 19
• 4.2.2 Influences of rock mass properties on cutting forces = 19
• 4.2.3 The influence of some operation condition factors on cutting forces = 19
• 4.3 Rock relief strength = 20
• 4.3.1 The influence of rock material strength properties on relief strength = 20
• 4.3.2 The influence of the geometry of the relief on relief strength = 21
• 4.3.3 Hardness of the mineral grains = 21
• 4.4 Wear mode prevalence = 22
• 5 Rock cutting tests to study wear = 26
• 5.1 Introduction = 26
• 5.2 The scraping test = 28
• 6 Rock properties with respect to wear = 34
• 6.1 Introduction = 34
• 6.1.1 Rock property based rock cutting wear index values = 34
• 6.1.2 Some considerations on the non-intrinsic rock property parameters = 35
• 7 Experiments = 40
• 7.1 Introduction = 40
• 7.2 Scraping test experiments = 40
• 8 Chisels used in the experiments = 44
• 8.1 Introduction = 44
• 8.2 Chisel material = 44
• 8.3 Chisel shape = 45
• 8.4 Thermocouple = 46
• 9 Properties of rock types used in the experiments = 48
• 9.1 Rock material properties = 48
• 9.1.1 Interpretation of the measured and derived rock properties = 49
• 9.2 rock sample preparation = 55
• 10 Test results on artificial rock(mortar) = 56
• 10.1 Repeatability and the effect of groove spacing = 56
• 10.1.1 Effect of spacing of the grooves, sawn into the rock disc = 56
• 10.1.2 Repeatability of the experiments, with respect to the amount of wear = 56
• 10.2 Scraping test experiments on mortar at constant cutting velocity = 57
• 10.2.1 Experiments on mortar composition 1 = 58
• 10.2.2 Results of experiments on three mortars of different strength = 67
• 10.2.3 Results of experiments on four mortars of different grain size = 73
• 10.2.4 Results of experiments on three mortars of different volume percentage of abrasive grains = 78
• 10.2.5 Results of experiments on two mortars of different shape of the quartz grains = 82
• 10.2.6 Results of experiments on mortars of different mineral content = 84
• 10.3 Specific wear equations based upon scraping test experiments on mortar = 87
• 10.4 Scraping test experiments on mortar with varying cutting velocity = 89
• 10.4.1 Experiments on mortar composition 8 = 91
• 10.4.2 Experiments on different mortars = 97
• 10.5 Comments on the experiments on artificial rock(mortar) = 99
• 11 Test results on natural rock types = 100
• 11.1 Introduction = 100
• 11.2 Experimental results = 100
• 11.2.1 Experiments on sandstones = 100
• 11.2.2 Experiments on limestones = 105
• 11.2.3 Correlation of test results obtained in experiments on artificial or natural rock = 105
• 11.3 Comments on the experiments on natural rock = 109
• 12 Relation of the scraping tests with rock cutting projects in practice = 110
• 12.1 Description of the T-850 rock cutting trencher = 114
• 12.2 Calculation of the feed of a single bit of the T-850 rock cutting trencher = 114
• 12.3 The specific wear in the schnarrtanne granite and the oberdorfer sandstone, predicted on the basis of results from the scraping test experiments = 115
• 12.4 Comparison of the field results with the experimental results = 117
• 13 Conclusions = 121
• 14 Closing remarks and recommendations = 124
• Nomenclature = 125
• List of abbreviations and symbols = 126
• References = 127
• Appendix Ⅰ : Comparison of porosity values determined by different methods = 132
• Appendix Ⅱ : Petrographic descripitions = 133
• Appendix Ⅲ : Momentary cutting forces in tests on Elb-sandstone D = 143