Abstract:

2604 island mining face return airway in Hebi NO.4 coal mine is selected as research object, roadway surrounding rock vertical stress is simulated by FLAC3D, The relation curve between the roadway surrounding rock depth and vertical stress is obtained. The vertical stress peak of surrounding rock has big difference, the depth vertical stress in roof and goaf side tends to be a constant value, the vertical stress of coal pillar is small. For broken surrounding rock, top coal is thicker, so the combined support technology of high strength and high pre-stressing bolt & diagonal cable beam is proposed, which makes the shallow and deep surrounding rock form a unified structure, mine pressure observations show that: roof-to-floor relative convergence is 215mm, both sides relative convergence is 157mm, the total roof separation was 35mm, which could provide reference to roadway support under the similar condition.

Key words: island mining face, surrounding rock control, vertical stress, support