In addressing the technical challenge on loose and weak wall rock development in No.9 coal seam at Luling Coal Mine,an analysis of the key factors affecting efficient excavation and support and the optimization of critical support procedures is conducted,to achieve general control over the dinting,roof control,and sidewall protection of coal roadways with loose and weak surrounding rock.We employed FLAC3D numerical software to simulate excavation-support plan and efficient excavation process in No.Ⅱ946 air return roadway at Luling Coal Mine.We put forward stability control design for wall rock in loose and weak coal roadways,which was"grouting anchor rod(anchor cable beam)advance active support plus coordinated flexible support"technology.Based on field experiments,the daily excavation length in No.Ⅱ946 air roadway increased from 2.4 m to 3.0～3.6 m.It turned out the optimization will effectively manage the deformation of loose and weak surrounding rock and enhance excavation efficiency.
关键词
松散软弱围岩/高效掘进/支护工艺优化/掘进效率
Key words
loose and weak surrounding rock/high-efficiency tunneling/optimization of support technology/tunneling efficiency
维普
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