Study on the Manifestation Patterns of Rock Pressure in Transport Roadways of Downward Mining Face and Support Countermeasures

Yuan Yongqiang(School of Civil Engineering)

Abstract

This paper employs numerical simulation methods to conduct a systematic analysis of the surrounding rock response and stability during close-proximity coal seam down-cutting mining. Research indicates that the 5MPa vertical stress formed on the right side of the initial mining coal seam (Seam 8) significantly impacts the stability of the haulage drift. The plastic zone of the mining face rock mass is dominated by shear failure. The vertical stress at the centre of the goaf is approximately zero, while significant stress concentration occurs around the periphery. A pronounced advance support pressure zone exists ahead of the working face. During the downward mining phase, the plastic zone of the lower coal seam roadway's surrounding rock exhibited vertical expansion, with the failure mode shifting predominantly to tensile failure. A combined support scheme utilising full-section anchor cables coupled with rock bolts was proposed as the permanent support form for the haulage roadway, effectively controlling surrounding rock deformation.

Keywords

Downhole drilling,Conveyor chute,Plastic zone,Support Measures

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DOI: http://dx.doi.org/10.26549/frae.v8i1.33840