Abstract: The "three soft" coal mining permanently poor resistance to deformation of the throttle body, permanently throttle maintenance frequently, safety and security performance is low, the problem of short-cycle. Through on stone Hao coal mine permanent throttle history status of investigation, analysis has throttle deformation damage of features, proposed used "three spray two anchor a note pulp", and control deformation, and reserved space, for build permanent throttle of programme, to stone Hao coal mine a level north track transport lane for cases, will the sets programme application yú site for test, Wells xià test results showed that, permanent throttle deformation in security can controlled range, change has original of the insufficient, enhanced has mine safety of coefficient, Permanent damper construction on similar geological situation to have some reference valuegrouting injection" and control of deformation, room, etc to build permanent damper, changed the insufficiency, enhanced the mine production safety coefficient, accelerate the development of the coal mine.

Key words: The "three soft", coal field, permanent throttle, Safety production