Abstract: Based on the research result of strength degradation law of fractured surrounding rock at post-peak in deep roadway, plastic parameters having been selected as the damage factor, the value of plastic parameters (initial damage factor value) and the shear strength parameters c, φ in unloading point of rock samples with different damage degree are calculated respectively according to the results of the interior precast initial damaged rock samples loading-unloading test and triaxial compression test conducted under all levels of confining pressure. The strength degradation model of damaged surround- ing rock in the deep roadway is preliminarily established. Through the replacement and derivation of the plastic parameters in the preliminary established strength degradation model, the final strength degradation model of damaged surrounding rock in the deep roadway, represented by the plastic parameter εps, is established so that it can be directly applied to the theoretical analysis and numerical simulation. When the model is implanted in FLAC3D, and then combined with the actual deep roadway engineering, the numerical simulation analysis is conducted in deep typical deformed and failure roadway in km deep mine. After the comprehensive comparison of numerical simulation results and its related conclusions with interior physical simulation and engineering field test results, the reasonableness of the established model is verified.

Key words: deep roadway, fractured surrounding rock, strength degradation, plastic parameter, shear strength parameter