Chapter 1 Introduction 1.1 The overview of caustics 1.2 Research updates of dynamic caustics method 1.3 Research updates of reflective caustics method 1.4 Application of dynamic caustics method in blasting study 1.5 Research deficiencies References Chapter 2 Experimental System and Theoretical Basis of Caustics 2.1 Introduction 2.2 Basic principle of caustics 2.3 The new experimental system 2.3.1 The overview of new experimental system 2.3.2 Digital high speed camera 2.3.3 Source light 2.3.4 Explosive loading system 2.4 Application of experimental system 2.4.1 Crack propagation test of single borehole explosion with defective medium 2.4.2 Experiment of double boreholes simultaneous detonation 2.5 Test error analysis 2.5.1 The source of error 2.5.2 Loading error analysis 2.5.3 Error analysis caused by the oblique incidence of light ray 2.5.4 The error from measurement 2.6 Conclusion References Chapter 3 Study of the Dynamic Fracture Effect Using Slotted Cartridge Decoupling Charge Blasting 3.1 Introduction 3.1.1 Theoretical research 3.1.2 Numerical simulation 3.1.3 Laboratory research 3.2 Experiment details 3.2.1 Air as medium 3.2.2 Plasticine as medium 3.3 Results of decoupled charging blast test 3.4 Analysis of dynamic fracture effect of detonation crack 3.4.1 Fracture mechanical characteristics of detonation primary crack 3.4.2 Detonation primary crack propagation characteristics using different packing media 3.4.3 Comparison of fracture features between primary crack and secondary crack 3.4.4 Arrest of detonation primary crack propagation 3.5 The numerical analysis of initial crack generation and damage characteristics 3.5.1 Finite element model 3.5.2 Process simulation of initial crack generation using the air medium 3.5.3 Process simulation of initial crack generation using another medium 3.5.4 The relation between decoupling coefficient and blasting damage 3.6 Conclusion References Chapter 4 Laboratory Study of Explosion Stress Wave Propagation in Jointed Rock Masses 4.1 Introduction 4.2 Experimental details 4.3 Experimental results of the planes with prefabricated through cracks
4.4 Analysis of the dynamic fracture behaviors of the main and secondary cracks 4.4.1 Fracture mechanics characteristics of the main crack 4.4.2 The cracking angle of secondary cracks 4.4.3 Different characteristics of the fracture mechanics between the main and secondary cracks 4.4.4 Fracture toughness of secondary cracks 4.5 Conclusion References Chapter 5 The Rock Breaking Mechanism of Directional Fracture Blast Using Irregular Shape Cartridge and Its Field Application 5.1 Introduction 5.2 Experimental details 5.3 Experimental results and dynamic characteristics of blast induced cracks 5.3.1 Directional propagation experimental results of blast induced cracks 5.3.2 Analysis of the mechanics characteristics on the blasting cracks with different cartridge structure 5.3.3 Blasting fracture physical process of the irregular shape cartridge 5.4 Field test and analysis of blasting effect 5.4.1 Design of field test 5.4.2 Analysis of technological indexes 5.4.3 Analysis of economic benefit 5.4.4 Discussion on the field application of irregular shape cartridge 5.5 Conclusions References Chapter 6 Analysis of Dynamic Characteristics of Through wall Cracks Between Two Boreholes in the Directed Fracture Controlled Blasting 6.1 Introduction 6.2 Experimental setup 6.3 Distinct lattice spring model(DLSM) 6.4 Experimental results 6.4.1 Crack length and the deflection angle of through wall crack 6.4.2 Change of crack propagation velocity and acceleration 6.4.3 Change rules of dynamic stress intensity factor(DSIF) 6.4.4 Dynamic energy release rate 6.5 DLSM numerical analysis of inter borehole crack through wall 6.5.1 Effects of the loading mode on inter borehole through wall 6.5.2 Effects of the borehole clearance on through wall crack 6.6 Conclusion and discussion References Chapter 7 Influence of Existing Defects on Dynamic Crack Propagation in Brittle Material under Impact Loading 7.1 Introduction 7.2 Experimental details 7.3 Experimental results & analysis 7.3.1 The characteristics of specimen after being damaged 7.3.2 The stress variation characteristics at tip of cracks 7.3.3 Analysis on kinetic characteristics of cracks 7.4 DLSM simulation on impact fracture of defected medium 7.4.1 The numerical model and simulation results 7.4.2 Analysis on numerical simulation results 7.4.3 The influence of constraint conditions of support 7.4.4 The effects of heterogeneity 7.5 Discussion and conclusion References Chapter 8 Research on Crack Expansion Characteristics of Semi disc Polymethyl Methacrylate Specimen with Weak Prefabricated Double layer Surfaces under Dynamic Load
8.1 Introduction 8.2 Experimental details 8.3 Numerical analysis 8.4 Results and analysis 8.4.1 Comparison of the destruction forms of specimens 8.4.2 Caustic spot of crack tip 8.4.3 Analysis of crack expansion speed 8.4.4 Analysis of stress characteristics of crack tip 8.4.5 Load time curve 8.4.6 Propagation of stress wave 8.5 Effects of weak surface spacing on simulation results 8.6 Conclusion References
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