Abstract: High-angle extra-thick compound roof rock has weak interlayer bonding force and low in-situ strength, and its roadway damage has asymmetric characteristics under the complex stress. Combined with the engineering examples, using similar simulation test, FLAC 3D numerical simulation and engineering test method, the thesis has analyzed the change rule of surrounding rock stress and displacement, etc. of irregular trapezoid and arch roadway, under conditions of conventional symmetric supporting and asymmetric intensive support, and it has also revealed the asymmetric failure mechanism of extra-thick inclined compound roof roadway. It has shown that affected by terrain characteristics, the asymmetric distribution of roadway structure and stress is the primary cause of asymmetric damage of roadway; decreases of compound layered rock level normal binding and stress concentration of obtuse angle parts directly lead to weak shear slip instability; the arched roadway with asymmetric support can effectively improve the stress state of surrounding rock, so as to reduce the deformation of the surrounding rocks,improve the stress state and balance load capacity of surrounding rock supporting system．

Key words: extra-thick inclined compound roof, characteristics of roadway damage, non-symmetric supporting, stability control