Practice of support optimization technology for large buried deep rock roadway
The buried depth of the track roadway in the west wing of the second level of the Chengjiao coal mine is 800 m,and it is excavated along the roof of the second 2 coal seam,which is a cross-layer roadway.After using the conventional an-chor cable spray support,the roadway deformation is serious,the maintenance period is short,and the cost is high.The me-chanical parameters of the surrounding rock of the roof and floor are tested.The results show that the composite properties of the coal seam roof are obvious,the compressive strength is low with large change,the rock mass is obviously heterogeneous,and the RQD classification belongs to the'poor'level.The range of surrounding rock loose circle is generally above 2.0 m,which is unstable surrounding rock with large loose circle.Therefore,the control idea of improving pre-tightening force and collaborative support is put forward,and the support scheme is optimized.The field application has achieved good results.
large buried depthscheme optimizationloosening ringcollaborative supportgrouting anchor cable
国家科技期刊平台
NSTL
万方数据
