High temperature properties of roof rock of coal

For the process of underground coal gasification the stability of the deep cavity is of utmost importance. To investigate the rock behaviour under in-situ conditions, triaxial tests were performed at high temperature (up to 800°C) and high confining stress (up to 14.2 MPa). Cylindrical samples (0.08 m by 0.04 m) were used, taken from roof rock of a coal layer. Thermal and mechanical properties of two diverse rock types are investigated and the consequences of these results for underground cavities are discussed.

• 1 INTRODUCTION

• 2 THE ROCK MATERIAL

• 3 APPARATUS AND EXPERIMENTAL PROCEDURE

• 4 EXPERIMENTAL RESULTS

• 5 DISCUSSION AND CONCLUSIONS

• APPENDIX

• REFERENCES