Deformation Characteristics and Support Optimization of Three Soft Coal Seam Roadway in Fold Structure Affected Area of Baoan Coal Mine
During the excavation of the transportation roadway in the fold structure affected area of Bao'an Coal Mine,with the increase of surrounding rock fragmentation and the development of tectonic stress,the original shed support cannot effectively control the deformation of surrounding rock.Based on the comprehensive in-situ stress measurement,the distribution range of surrounding rock fragmentation and the deformation characteristics of the original supporting surrounding rock,the support method of retaining sec-tion+anchor(cable)+surrounding rock grouting+steel frame shed is proposed.By appropriately increasing the roadway section,certain deformation of the surrounding rock is allowed to release some of the surround-ing rock stress.Through grouting,the bearing capacity and stability of surrounding rock are improved,and the coupling effect of bolt(cable)and surrounding rock is improved.The shed+single pillar+metal mesh is used to exert a large force on the surrounding rock of the roadway surface,which cooperate,with the bolt(ca-ble)and the surrounding rock to control the deformation of the surrounding rock.Through engineering appli-cation,the deformation problem of surrounding rock in transportation roadway is well solved,which pro-vides reference for surrounding rock support of three-soft coal seam roadway in structural influence area.
three soft coal seamfold structuresurrounding rock deformationroadway support
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