Abstract:

The effective control of the deformation of the surrounding rock is the basis of efficient

coal mining at the mining face. When the roof of the cutting hole is composite roof，it is easy to have large

amount of separation，serious deformation and even roof fall accidents. Based on the engineering back⁃

ground of borehole open off cut excavation on the coal face I010206 of a mine in Xinjiang，a secondary

roadway formation method is proposed to complete the large-span borehole cutting excavation in view of

the fact that the open off cut roof is a composite roof composed of mudstone，limestone and other soft and

hard rocks，and there are cracks in the roof，poor bearing capacity and local cavities. The deformation con⁃

trol of open off cut surrounding rock is realized by comprehensive use of roof grouting，anchor-net-cable

support，shotcrete and monomer reinforcement，and the support scheme is given in detail. After engineer⁃

ing application，the cut rock deformation of I010206 coal face is small，and the cut wall rock remains sta⁃

ble during subsequent equipment installation，which realizes effective control of the cut wall rock deforma⁃

tion of composite roof.

Key words:

coal mining, composite roof, cut, anchor-net-cable support, roof grouting