Rock Reinforcement and Rock Support

ISBN-13: 9781138095830 / Twarda / 2018 / 486 str.

Opis

The stability of underground and surface geotechnical structures during and after excavation is of great concern as any kind of instability may result in damage to the environment as well as time-consuming high cost repair work. The forms of instability, their mechanisms and the conditions associated with them must be understood so that correct stabilisation of the structure through rock reinforcement and/or rock support can be undertaken.

Rock Reinforcement and Rock Support elucidates the reinforcement functions of rock bolts/rock anchors and support systems consisting of shotcrete, steel ribs and concrete liners and evaluates their reinforcement and supporting effects both qualitatively and quantitatively. It draws on the research activities and practices carried out by the author for more than three decades and has culminated in a most extensive up-to-date and a complete treatise on rock reinforcement and rock support.

Spis treści

1 Introduction 2 Mechanism of failure in rock engineering structures and its influencing factors 2.1 Rock, discontinuities, and rock mass2.2 Modes of instability about underground openings 2.3 Modes of instability of slopes 2.4 Modes of instability of foundations 3 Design philosophy of rock support and rock reinforcement 3.1 Introduction 3.2 Empirical design methods 3.3 Analytical approach 3.4 Numerical methods 3.5 Methods for stabilization against local instabilities 3.6 Integrated and unified method of design 3.7 Considerations on the philosophy of support and reinforcement design of rock slopes 3.8 Considerations on philosophy of support design of pylons 3.9 Considerations on the philosophy of foundation design of dams and bridges 4 Rockbolts (rockanchors) 4.1 Introduction 4.2 Rockbolt/rockanchor materials and their mechanical behaviors 4.3 Characteristics and material behavior of bonding annulus 4.4 Axial and shear reinforcement effects of bolts in continuum 4.5 Axial and shear reinforcement effects of bolts in medium with discontinuities 4.6 Estimation of the cyclic yield strength of interfaces for pull-out capacity 4.7 Estimation of the yield strength of interfaces in boreholes 4.8 Pull-out capacity 4.9 Simulation of pull-out tests 4.10 Mesh bolting 5 Support members 5.1 Introduction 5.2 Shotcrete 5.3 Concrete liners 5.4 Steel liners and steel ribs/sets 6 Finite element modeling of reinforcement/support system 6.1 Introduction 6.2 Modeling reinforcement systems: rockbolts 6.3 Finite element modeling of shotcrete 6.4 Finite element modeling of steel ribs/sets or shields 6.5 Finite element analysis of support and reinforcement systems 6.6 Discrete finite element method (DFEM-BOLT) for the analysis of support and reinforcement systems 7 Applications to underground structures 7.1 Introduction 7.2 Analytical approach 7.3 Numerical analyses on the reinforcement and support effects in continuum 7.4 Mesh bolting in compressed air energy storage schemes 7.5 Reinforcement effects of rockbolts in discontinuum 7.6 Support of subsea tunnels 7.7 Reinforcement and support of shafts 7.8 Special form of rock support: backfilling of abandoned room and pillar mines 8 Reinforcement and support of rock slopes 8.1 Introduction 8.2 Reinforcement against planar sliding 8.3 Reinforcement against flexural toppling failure 8.4 Reinforcement against columnar toppling failure 8.5 Reinforcement against combined sliding and shearing 8.6 Physical model tests on the stabilization effect of rockbolts and shotcrete on discontinuous rock slopes using tilting frame apparatus 8.7 Stabilization of slope against buckling failure 9 Foundations 9.1 Introduction 9.2 Foundations under tension 9.3 Foundations under compressions 10 Dynamics of rock reinforcement and rock support 10.1 Introduction 10.2 Dynamic response of point-anchored rockbolt model under impulsive load 10.3 Dynamic response of yielding rockbolts under impulsive load 10.4 Turbine induced vibrations in an underground powerhouse 10.5 Dynamic behavior of rockbolts and rockanchors subjected to shaking 10.6 Planar sliding of rock slope models 10.7 A theoretical approach for evaluating axial forces in rockanchors subjected to shaking and its applications to model tests 10.8 Application of the theoretical approach to rockanchors of an underground powerhouse subjected to turbine-induced shaking 10.9 Model tests on fully grouted rockbolts restraining a potentially unstable rock block against sliding 10.10 Excavations 10.11 Dynamic response of rockbolts and steel ribs during blasting 11 Corrosion, degradation, and nondestructive testing 11.1 Introduction 11.2 Corrosion and its assessment 11.3 Effect of degradation of support system 11.4 Nondestructive testing for soundness evaluation 11.5 Conclusions 12 Conclusions