Abstract: In response to the problem of the unstability of the “three-soft” coal roadways caused by serious deformation despite the repeated reinforcement of it in Zhengzhou mining area, the characteristics of “three-soft” coal seam occurrence, stress environment and the causes of the unstability have been analyzed. On this basis, the strengthening control mechanism with support and cable has been proposed. In this supporting system, on one hand, the bearing capacity and stability of support are improved by the supporting resistance from the cable. On the other hand, the shear deformation of creep coal seam is effective controlled by higher supporting resistance of support. In addition, the bearing capability of coal seam is also developed, which makes the collaborative bearing of the support, cable and surrounding rock possible, and according to the mechanical calculation, the primary and secondary parts to be strengthened and the reasonable determination of the cable prestress are indicated. After the application of support and cable strengthening technology in 31041 haulage roadway of Chaohua mine, convergence of two sides in the roadway are controlled less than 300 mm during the impact of working face mining, and convergence between roof and floor are controlled less than 400 mm, which can control effectively the deformation of deep “three-soft” coal roadway.

Key words: deep mining, three-soft, roadway, stability