Chapter 1Introduction
1.1Background and Significance
1.2Foreign and Domestic Researches
1.2.1Current research of rock bursts
1.2.2Current research of geostress pre-relief controlled blasting
1.2.3Current research on numerical simulation of the stability of surrounding rocks
1.3Main Research Contents and Technical Route
1.3.1Research contents
1.3.2Technical route
1.4Expected Target
1.5Main Innovations
Chapter 2Factors and Preventing Methods of Rockbursts
2.1Definition of Rockburst
2.2Conventional Evaluation Indexes of Rockbursts
2.3Establishment of Numerical Model for Analyzing Factors of Rockbursts
2.3.1Introduction to simulation tools
2.3.2Model establishment and benchmark simulation
2.4Impact of Rocks Physical and Mechanical Properties on Rockbursts
2.4.1Qualitative analysis of the impact of rock's physical and mechanical properties on rockbursts
2.4.2Quantitative analysis of the impact of rock's physical and mechanical properties on rockbursts
2.5Numerical Analysis of the Effects of Excavating and Supporting Conditions on Rockbursts
2.5.1Numerical analysis of the effects of full-face excavation and stepwise excavation on rockbursts
2.5.2Numerical analysis of the effect of supporting conditions on rockbursts
2.6Recommended Ideas for Controlling High-intensity Rock Bursts
2.7Summary
Chapter 3Mechanism of the Pre-release De-stress Blasting for Rockbursts
3.1Definition of De-stress Blasting
3.2Microscopic Mechanism of the De-stress Blasting
3.3Derivation of the Calculation Formula of Residual Stress after De-stress Blasting
3.3.1Derivation of de-stress blasting equation on two-dimensional plane
3.3.2Deduction of the de-stress blasting equation on 3-dimensional plane
3.4Role of the Stress Pre-release Loose Circle
3.5Factors Influencing De-stress Blasting Effectiveness
3.6Summary
Chapter 4Experimental Study on Rock Mechanics of Surrounding Rocks in Tunnels
4.1Lab Environment
4.2Test Methods and Results
4.2.1Uniaxial compressive strength test
4.2.2Tensile strength test
4.2.3Normal triaxial compression test
4.3Summary
Chapter 5Optimization of Parameters for Pre-release De-stress Controlled Blasting Based on Numerical Simultations
5.1Response Platforms of Numerical Simulation Analysis
5.1.1ANSYS/LS-DYNA numerical platform
5.1.2FLAC 3D numerical analysis platform
5.2Calculation Process of De-stress Controlled Blasting
5.2.1ANSYS/LS-DYNA numerical simulation blasting
5.2.2Coupling process of ANSYS/ LS-DYNA and FLAC 3D
5.2.3Stress release simulation of de-stress blasting in tunnel
5.3Scheme for the De-stress Controlled Blasting
5.3.1Overall plan
5.3.2Design for orthogonal experiment numerical simulation
5.3.3Design for single factor numerical simulation
5.4Result Analysis of Numerical Simulations
5.4.1Result analysis of orthogonal experiment numerical simulation
5.4.2Result analysis of single-factor numerical simulation
5.5Summary
Chapter 6On-site Tests of Stress Release by Borehole De-stress Blasting
6.1General Engineering Situation of Test Site
6.1.1Rockburst features of Sangzhuling tunnel
6.1.2Rock bursts in Sangzhuling tunnel
6.2Blasting Scheme Design
6.3Test Equipment
6.3.1Stress test equipment
6.3.2De-stress blasting test equipment
6.4Test Process
6.4.1Experimental process of stress testing
6.4.2Test process of de-stress blasting
6.5Data Processing and Test Results
6.5.1Experimental data
6.5.2Data processing of stress test results
6.5.3Data processing results
6.6Comparative Analysis
6.7Summary
Chapter 7Application of De-stress Controlled Blasting in Double-shield TBM Tunnel
7.1Engineering Overview of Test Site
7.2Influencing Factors of Rockburst Stucks in this Tunnel
7.3Research Status of Advanced Rockburst Forecast Technology
7.4De-stress Blasting Test Under Double Shield TBM
7.4.1Native stress test
7.4.2De-stress bursting test
7.4.3Data processing results
7.5Summary
Conclusion and Outlook
Acknowledgements
References