Abstract: The failed section of the auxiliary vertical shaft ingate in Zhaogu No.2 coal mine was very deep. Surrounding rock mass were high stressed, swelling and jointed compound soft rock. In order to repair the failed ingate, according to the geological conditions and failed conditions, the deformation failure mechanism was analysis. The repair and control plan were set up, and the failed section of the ingate was successfully repaired and controlled. Composite support structure means of the anchor (cable) spray +retractable steel U bracket + secondary support of stone and concrete reinforced concrete + full-face bolting reinforcement + corner anchor beam under complicated geological condition are obtained. The supporting scheme was established and numerical simulation by FLAC3D, and the analysis results show that the supporting scheme is rational.

Key words: Deep mine soft rock, Ingate, Composite support, Repair and control, Numerical simulation