Abstract: To solve the problem of drilling anchor holes into the roadway floor, migration characteristics of the reverse circulation drilling process of boring mud have been analyzed. The analysis has shown that the interaction of boring mud three-field is the primary cause of restricting floor anchor wire hole quickly drilling, and pump suction reverse circulation drilling that can be effectively prevented by boring mud three-field forming has been put forward. Using principles of solid-liquid fluid mechanics, mechanical formula of flushing fluid along hydraulic loss and slag drilling fluid return velocity has been successfully deduced. According to the field practice, the relationship between floor anchor wire hole pump suction reverse circulation drilling depth and drilling pump on vacuum degree and slag drilling fluid return velocity, and drilling slag volume content has been obtained. The result has shown that pump suction reverse circulation faster penetration of floor anchor hole is feasible. A set of pump suction reverse circulation drilling system has been developed, and floor anchor wire hole drilling and slag discharge operation at the same time have been realized. Field test has shown that effective time of drilling depth of 5.6 m floor anchor wire hole can be controlled within 30 min. The difficult problem of floor anchor wire hole deep hole drilling has been solved, and the work environment has been purified.

Key words: floor anchor wire hole, pump suction reverse circulation, hydraulic loss, boring mud