关键词: 深部巷道, 工程软岩, 非连续&ldquo, 双壳&rdquo, 控制机理

Abstract: When the deep roadway has been deformed seriously, it is difficult for the traditional support to achieve effective control of roadway surrounding rock. Taking the distortion and breakage of the whole section of the New South total return air roadway of Tao’er coal mine as the research object, the damaged condition and the factors that cause the damage have been analyzed through the field investigation and monitoring. The study has shown that the reason of the distortion and breakage of the whole section of roadway is that firstly surrounding rock shear and breakage occurs under the effect of high ground stress, and then the surrounding rock gets further expansion break and creep under the effect of gas pressure and water conditioning. The paper has also analyzed the control mechanism of discontinuous “double shell” surrounding rock with the application of discontinuous "double shell" surrounding rock control theory. Additionally, this study has helped to build the key technology of the control of discontinuous “double shell” surrounding rock as the U-shaped steel (external stress supports shell)+flexible plate (soft layer)+grouting anchor bars(internal stress reinforces shell), and finally obtained good supporting effect.

Key words: deep roadway；soft-engineering rock；discontinuous&ldquo, double shell&rdquo, ；control mechanism