急倾斜破碎围岩巷道的修复支护是当前困扰矿区生产的技术难题之一。本文以攀枝花煤业集团太平煤矿南四大巷破碎围岩为研究对象，通过现场调研、相似材料物理模拟试验、数值模拟和理论分析相结合的方法，研究了急倾斜破碎围岩巷道的变形和破坏机理。在实验研究和实测分析的基础上，得出穿越煤层破碎带围岩的太平煤矿南四运输大巷的主要特征：巷道的变形与破坏由煤层开始，随煤层所处的位置表现出不对称变形与破坏。本文采用RFPA2D数值计算软件对太平煤矿南四运输大巷的围岩条件进行了模拟研究。采用先加载后开挖的顺序，再现了巷道开挖与围岩破坏和垮落过程，分析了急倾斜破碎围岩巷道的不对称变形与破坏特征，揭示了巷道变形和破坏是沿着软弱层和层理的拉伸和剪切破坏。在以上研究的基础上，提出了太平矿南四运输大巷合理的修复支护方案，该研究对此类巷道的修复支护提供了借鉴。通过现场实践应用验证了研究结论的正确性。

The repair support of fracture zone in steep layer is a hard problem needed to be solved in many coal mines recently. The fracture rock of South-4 Main Transportation Roadway of Taiping Coalmine serves as the research object in the paper. Through the field experiment, simulating model test, numerical simulation and the theoretical analysis, the deformation and failure mechanism of fracture rock roadway in steep layer are studied. Based on simulating model test and situ-observation analysis, the main failure character of entry is obtained. The distortion and destruction of main roadway start from the coal seam and take on asymmetric distortion and destruction. Using RFPA2D numerical calculation software, the rock environment of South-4 Main Transportation Roadway is simulation. By the sequence of firstly loading, then caving, the process of failure and collapse are presented. The asymmetric distortion and destruction are analyzed. It is found that the failure zone occurs along weak coal seam and the mechanism of roadway failure and displacement is discovered to be tension and shear failure along layer bedding and weak seam. Furthermore, the roadway proper repair support method is put forward. This research can give reference to such engineering. Finally, the conclusion is tested and verified by practical examples analyzing.