To prevent the collapse of dangerous rock masses on steep rocky reservoir banks which can cause casualties and property loss, it is essential to design and conduct practical experiments to quantify the evolution processes of the reservoir banks and control such dangerous rock masses.
Using the Jianchuandong Dangerous Rock Mass project as a case study, this book generalizes the mechanical model of the project to show how improved equipment can be used to measure the mechanical state transition under the continuous action of axial pressure. It details a series of experiments to study the evolution of a severely steep rocky reservoir bank, which comprehensively consider the influence of hydraulic coupling, dry-wet cycles, axial pressure, and time-dependent effects. The results support a new method for determining the stability of dangerous rock masses on reservoir banks.
- Combines engineering principles, real data, experimental methods and results
- Provides a complete research method for investigating hydrogeology failure processes
The book suits practitioners in hydropower engineering, engineering geology, and disaster protection.
Author(s): Luqi Wang, Wengang Zhang
Series: Challenges in Geotechnical and Rock Engineering
Publisher: CRC Press
Year: 2023
Language: English
Pages: 136
City: Boca Raton
Cover
Half Title
Series
Title
Copyright
Contents
Challenges in geotechnical and rock engineering
Preface
1 Introduction
1.1 Research motivation and significance
1.2 Overviews on present research
1.2.1 The analysis method of dangerous rock mass
1.2.1.1 The stability of dangerous rock mass
1.2.1.2 Analysis of dynamic collapse of dangerous rock mass
1.2.1.3 Research on the steep dangerous rock mass
1.2.2 Influence of reservoir water fluctuation on the rocky bank
1.2.2.1 The dry–wet cycles
1.2.2.2 The hydraulic coupling
1.2.2.3 The time-dependent effect
1.2.3 State-of-the-art research of rock damage mechanics
1.3 Shortcomings and prospects in research
1.4 Research method
1.4.1 Research contents
1.4.2 Novelty of the presented research
1.4.3 Technical flowchart
2 Development of the mechanical model
2.1 Overview of the reservoir bank in the Wuxia Gorge section
2.2 The survey of dangerous rock mass on the reservoir bank
2.2.1 Identifying the boundaries of dangerous rock mass W1
2.2.2 Investigation of the submerged part of the steep cliff
2.2.3 Formation characteristics of the base of the rock mass
2.2.4 Results
2.3 Formation characteristics and the mechanical model of the JDRM
2.3.1 Overview of the JDRM
2.3.2 Formation characteristics of the JDRM
2.3.3 Generalization of the mechanical model
2.4 Summary of this chapter
3 Establishment of the test environment
3.1 Establishment of the mechanical environment
3.2 Testing of mechanical properties
3.2.1 Analysis of polarizing microscope
3.2.2 Analysis of SEM and EDS
3.3 Methods for controlling the quality of samples
3.4 Summary of this chapter
4 Analysis of hydraulic coupling test
4.1 Analysis of macro-strength
4.2 Quantitative study of micro-parameters
4.2.1 Introduction of linear parallel bond model
4.2.2 Calibration and sensitivity analysis of micro-parameters
4.2.2.1 Establishment of the numerical model
4.2.2.2 Calibration of the bond effective modulus
4.2.2.3 Calibration of the effective modulus
4.2.2.4 Calibration of the normal-to-shear stiffness ratio
4.2.2.5 Calibration of the bond normal-to-shear stiffness ratio
4.2.2.6 Calibration of the tensile strength and cohesion strength
4.2.2.7 Further adjustment of parameters and staged simulation
4.2.3 Quantitative analysis of mechanical properties of rock mass
4.3 Analysis of the evolution process of rock mass
4.3.1 Evolution process of deformation
4.3.2 Damage evolution trend based on acoustic emission experiment
4.3.3 The failure mechanism by introducing damage evolution
4.3.4 Amplification of the effective axial pressure
4.4 Summary of this chapter
5 Experimental research on the fluctuation of reservoir water level
5.1 The weakening experiments under dry–wet cycles
5.2 Mechanical state transition test under continuous axial pressure
5.3 Creep experiment under mechanical state transition
5.3.1 Analysis of the test curves
5.3.2 Analysis of the progressive cumulative deformation stage
5.3.3 Analysis of the sudden failure stage
5.3.3.1 Determination of parameter a
5.3.3.2 Determination of parameter E1 and η
5.4 Evolution process of the dangerous rock mass on the reservoir bank
5.4.1 Formation of the damage zone (stage A)
5.4.2 Progressive cumulative deformation (stage B)
5.4.3 Nonlinear accelerated failure (stage C)
5.5 Summary of this chapter
6 The evolution analysis and the treatment of JDRM
6.1 Analysis method of the dangerous rock mass on the reservoir bank
6.1.1 The transition test of the mechanical state
6.1.2 The construction of the statistical damage constitutive model
6.1.3 The superposition of damage variables
6.1.4 The determination of the FOS
6.2 Damage evolution and stability analysis of JDRM
6.2.1 The statistical constitutive damage model under dry–wet cycles
6.2.2 Mechanical damage analysis of the submerged dangerous rock mass
6.3 Stability analysis of JDRM
6.4 Analysis of dynamic collapse of JDRM
6.4.1 Establishment of the numerical model
6.4.2 Determination of parameters
6.4.3 Dynamic analysis of collapse
6.5 Analysis of the treatment of JDRM
6.5.1 Preventative methods for the JDRM
6.5.2 Influence of the preventative methods
6.5.2.1 Influence of the preventative methods on the displacement field
6.5.2.2 Influence of preventative methods on the shear stress field
6.5.2.3 Influence of preventative methods on the FOS
6.6 Summary of this chapter
7 Conclusions and outlook
7.1 Conclusions
7.2 Outlook
References
Index
