Abstract: Failure characteristics of the key portions in underground openings used for pump house and suction wells have been analyzed to detect its major control factors and causes, and the stability control strategy has been proposed. The result indicates that the deformation in the underground openings are mainly caused by traditional layout form, the great depth, high geostress, the high level of the horizontal tectonic stress and the high mineral content in the surround rock. The integrated design technique for pump house and suction wells are utilized. It minimizes greatly degrees of the stress concentration and enhances the overall stability of the underground excavations, combined with the counter-measures of anchor cable and truss with the foot grouting anchor pipe for stabilization of deep-buried underground openings. These new techniques have been applied in underground openings for -1020 level horizontal pump house and water suction wells in Kongzhuang coal mine. The in-situ monitoring data plots show that it has achieved very well control effect.

Key words: deep mine, high-level tectonic stresses, intense expansion, underground openings, stability control