APPEARANCE AND CONTROL OF GROUND PRESSURE IN SOFT ROCK DRIFTS AT COAL MINE

This paper systematically summarizes the results of researching the soft rock classification, attribution and judgement of China′s coal mine drifts;based on the deformation regularity and pressure features of surrounding rock of soft rock drifts and according to requirements in operation and safety of coal mine drifts also discusses the basic principles of supporting the soft rock drifts;and introduces some un normal but effective supporting means such as U steel yieldable set with wall back filling and bolt grouting.