1 Introduction 2 Influence of the sedimentary rhythm and the interfaces 2．1 Introduction 2．2 Geological setting and bedded salt formations 2．2．1 Geological setting 2．2．2 Bedded salt formation 2．3 Development of sedimentary rhythms and interfaces 2．3．1 Sedimentary rhythm 2．3．2 Interfaces 2．4 Characterization of interfaces by scanning electron microscope 2．5 Cementation state and strength of the interfaces 2．6 Conclusion of this chapter 3 Failure mechanism of bedded salt formations surrounding salt caverns 3．1 Introduction 3．2 Geological outline 3．2．1 Bedded salt formations in the Yunying Salt Mine 3．2．2 Lithological classification of the layers 3．3 Physical simulation and discussion 3．3．1 Experimental scheme and apparatus 3．3．2 Failure under uniaxial compressive test 3．3．3 Failure under triaxial compressive test 3．3．4 Discussion on the influences of dip angle， interlayers and interface ．．． 3．4 Numerical analysis and discussion 3．4．1 Numerical model and parameters 3．4．2 Failure region in bedded salt formations surrounding the salt cavern ．．． 3．4．3 Discussion on the influence of creep characteristics of salt rocks 3．5 Conclusion of this chapter 4 Geotechnical feasibility analysis of compressed air energy storage 4． I Introduction 4．2 Working gas volume and minimum cavern volume for the CAES 4．3 Geological conditions and numerical model for CAES 4．3．1 Geological conditions 4．3．2 Strata simplification 4．3．3 Numerical model 4．4 Mechanical tests of the bedded salt formations 4．4．1 Creep tests 4．4．2 Other conventional mechanical tests 4．5 Material parameters and cavern operation patterns 4．5．1 Material parameters 4．5．2 Operation patterns 4．6 Results and discussion 4．6．1 Distribution of the plastic zones and displacement contours 4．6．2 Cavern volume shrinkage 4．6．3 Discussion 4．7 Conclusion of this chapter 5 Time-dependent subsidence prediction model and influence factors analysis 5．1 Introduction 5．2 Time-dependent volume reduction of the cavern 5．2．1 Construction stage 5．2．2 Operating period 5．2．3 Unit volume reduction rate 5．3 Time-dependent subsidence prediction model 5．3．1 Time-dependent surface subsidence 5．3．2 Tilt， curvature and horizontal displacement 5．4 Case analysis and model verification 5．4．1 Model and basic parameters 5．4．2 Model verification 5．5 Parametric analyses by the proposed model and discussion 5．5．1 Influence of the stratigraphic parameters 5．5．2 Influence of the design parameters 5．5．3 Discussion on the applicability 5．6 Conclusion of this chapter 6 Mechanism of collapse sinkholes induced by solution mining of salt formations and measures for prediction and prevention 6．1 Introduction 6．2 Description of the Dongxing Salt Mine 6．2．1 Geological setting 6．2．2 Mining methods 6．3 Three collapse sinkholes and the relevant geophysical explorations 6．3．1 The first collapse sinkhole and the primary exploration achievement 6．3．2 Collapse process 6．4 Mechanical model and influence factors 6．4．1 Mechanical model for the roof 6．4．2 Influence factors of roof failure 6．5 Numerical simulation 6．5．1 Numerical model and parameters 6．5．2 Results and discussion 6．6 Conclusion of this chapter 7 Conclusions and prospect References
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