Abstract In fully-mechanized longwall mining, gob-side entry retaining is a no-coal-pillar mining technology, which can increase the recovery of coal pillar resources, reduce the amount and cost of roadway excavation. However, the surrounding rock of the retained roadway produces large deformation due to the turning and sinking movement of the roof, and the stress transfer from the overlying rock layer can be effectively reduced by cutting off the immediate roof and the main roof.This paper introduces the formation and control mechanism of cutting roof along the gob-side entry retaining, and mainly investigates the synergistic bearing characteristics of the roof-cutting support and gangue roadside support.The results of engineering practice show that: cutting off of thick roof along the gob-side entry retaining is feasible, fully meet the site production requirements. In the process of cutting roof, the gangue collapses and swells to form gangue roadside support. The gangue roadside support and the roof-cutting support beside the roadway carries the roof pressure, forming the cooperative bearing structure. In this way, the damage rate of the roof-cutting support is low, the deformation of the roadway is small, and the control effect is remarkable.
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Wu et al. (2024) studied this question.
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