Research on Roadway Support Technology for Deep Composite Roof Slabs in Wajinwan Coal Mine
Aiming at the problems of serious roof subsidence and poor reinforcement support during the tunneling of composite roof roadway in Dujinwan coal mine,the deformation and damage characteristics of composite roof roadway and the support principle were analysed by combining on-site monitoring,theoretical analysis and numerical simulation,and the spacing of anchor cables between rows of 2,400 mm × 2,400 mm in the original support scheme was adjusted to 1,600 mm x 1,600 mm,and the arrangement of 2-2 was adjusted to 1,600 mm × 1,600 mm,which is the same as that of the original support scheme.The row spacing of 2 400 mm × 2 400 mm and"2-2"arrangement in the original support scheme is adjusted to 1 600 mm × 1 600 mm and"2-3-2"arrangement,and the feasibility of the support parameters is verified by numerical simulation.Through on-site measurement,it can be obtained that the sinking amount of the roof plate and the force of the anchor cable are controlled within 56 mm and 260 kN respectively,which effectively control the deformation damage of the roof plate of the roadway.
composite roof slabdeformation damage characteristicssupport parameterseffective control
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