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II <br />EVALIJATION OF CYLINDRICAL AND LONG <br />HORIZONTAL CAVITY SIZE <br />TABLE OF CONTENTS <br />• <br />i <br />~~~ <br /> <br />ecti n Pat=_e <br />1.0 INTRODUCTION AND SCOPE ....................................................................... 1 <br />1.1 Introduction ................................................................................................ 1 <br />1.2 Scope .......................................................................................................... 2 <br />2.0 CONCLUSION;i AND RECOMMENDATIONS ............................................ 3 <br />3.0 DESIGN PARR:METERS ................................................................................... 5 <br />3.1 Regional Parameters .................................................................................. 5 <br />3.2 Material F'rnperties ..................................................................................... 10 <br />3.3 Fluid Presstue Assutnpdons ....................................................................... IS <br />3.4 In Situ Stress .............................................................................................. 15 <br />4.0 DESIGN ANAL'YSIS ........................................................................................... 16 <br />4.1 Span Evaluation for a Cylindrical Cavity .................................................. 16 <br />4.2 Extent of Roof Fallout ............................................................................... 23 <br />4.3 Influence.if Cavem Length on Stability .................................................... 26 <br />4.4 Pillar Stability ............................................................................................ 26 <br />REFERENCES .............................................................................................................. 31 <br />J. F. T. Agapito & Associates, Inc. i <br />