Abstract: The geological and mechanical conditions of roadways become more complicated compared with those in the shallow part with the mining depth increasing. Consequently, the nonlinear mechanical phenomena especially the problem of floor heave in the roadway occur frequently. In order to explore the most effective type of cable fixed in floor, at first, the mechanism of floor heave controlled by the base-angle-bolt has been analyzed in two ways including cutting off plastic slip line effectively and decomposing pressure according to the mechanical analytical model of the bolt controlling roadway floor heave. Then six types of base-angel-bolt with different materials and specifications have been designed to carry out bending test. According to the optimized analysis of the results, the most appropriate type of I-3 has been determined and successfully applied in the engineering practice of Kongzhuang -785 mine in Datun. And the displacement monitoring curve has indicated that an obvious effectiveness has been obtained by applying the type of I-3 base-angle-bolt.

Key words: deep engineering, floor heave, base-angel-bolt, bending test