|
Abstract The second-level blind inclined shaft of Xingdong Mine was classified as a typical deep-buried roadway with high in-situ stress. Large deformation of the roof and two side walls of the roadway was observed, and bolt and cable fractures were detected at individual positions. To reduce roadway repair volumes, research on surrounding rock control technologies for large-section development roadways in deep mines was carried out. Combined with the deformation characteristics of the blind inclined shaft, the deformation mechanism of the roadway was analyzed. The expansion of the plastic zone in the two side walls of the roadway was found to increase the maximum normal stress borne by the roof, which induced severe roadway deformation. Therefore, the collaborative support of the surface surrounding rock of the two side walls and the roof via bolts and cables was identified as the key to reducing roadway deformation. On this basis, a surrounding rock control concept featuring high-resistance and pressure-yielding performance as well as coordinated and high-strength support of bolts and cables was proposed. The FLAC3D numerical simulation software was adopted to evaluate the proposed support scheme. The results showed that the collaborative bolt and cable support technology was capable of forming a collaborative control structure for shallow and deep surrounding rocks, by which roadway deformation was effectively reduced. The effectiveness of this technology was verified through field applications, which can provide a reference for surrounding rock control of deep roadways
|