回采工作面多巷布置留巷围岩变形特征与支护技术

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Abstract Based on the entries retained for next working face in the multi-entry system in Jincheng mining district，and a large quantity of monitoring data collected in these entries，the characteristics and mechanisms of deformation and damage associated with these entries are analyzed. Numerical simulation code FLAC3D is utilized to analyze the effects of entry layout pattern，coal pillar size，and face width on the deformation and damage of the entries retained for next face；and the stress distribution around the entries and faces are calculated. The reinforcement patterns and parameters suitable for entries retained for next face are proposed based on above researches. Underground tests are carried out；the surrounding rock displacements，rock bolt and cable loads are monitored during the whole service period of the entries retained；and the reinforcement performance is evaluated. The research results show：when the entry retained is originally affected by the front abutment stress of the current face，the surrounding rock displacement increases moderately；when the current working face advances past the entry retained for a certain distance，the surrounding rock displacement increases sharply；the peak of displacement velocity appears when the working face is 50–200 m away；and then the displacement is tending towards stability；when the entry retained is affected by the front abutment stress of the next face，the surrounding rock displacement increases evidently again. The deformation of the entries retained is closely connected with entry layout patterns，coal pillar size and the parameters of working faces. The rock bolts and cables with high pretension and intensive strength，and the cable bolting set in full entry section are fit for the entries retained，which can reduce surrounding rock displacements greatly and keep the entries stable for a long time. Finally，the existing faults are also addressed and some improvement suggestions are provided.

Key words： mining engineering coal entry entry retained numerical simulation underground test

Received: 10 April 2012

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http://www.rockmech.org/EN/Y2012/V31/I10/2022

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