Abstract
Backfill-strip mining, which combines the advantages of strip mining and backfill mining, is proposed to overcome high cost and shortage of filling materials in coal mines at present. The composite support pillar (CSP) is a combined support pillar of the filling body and coal pillar for supporting the overlying strata and achieving subsidence control. The stability of CSP is the key to the success of subsidence control in backfill-strip mining engineering. A stability evaluation model of the CSP mechanical model was proposed. First, the lateral stress between the coal pillar and filling body is calculated in consideration of their interaction relation in CSP based on the earth pressure theory. Then, the width calculation models of the broken and plastic zones of three types of CSPs are established on the basis of limit equilibrium theory. On this basis, the mathematical model of the safety design width of the three types of CSPs is proposed to ensure the stability of CSP. Meanwhile, an engineering case of stability width design of CSP is shown. This study can provide theoretical reference and technical support for the engineering design of backfill-strip mining.
Highlights
Coal resources are regarded as an important factor in the development of the world economy. e consumption of coal, which is a conventional fuel, has continuously increased in recent decades
Excavation of coal produces large voids in the coal seam and disturbs the equilibrium of the original internal stress in the surrounding rock strata. is condition leads to overlying strata bending and breaking, which result in surface subsidence
E stability of composite support pillar (CSP) is the key to the success of subsidence control of backfill-strip mining. e deformation characteristics, stress distribution, and failure behavior of CSP are studied to provide theoretical reference for the stability evaluation of CSP
Summary
Research on the Stability Evaluation Model of Composite Support Pillar in Backfill-Strip Mining. E composite support pillar (CSP) is a combined support pillar of the filling body and coal pillar for supporting the overlying strata and achieving subsidence control. E stability of CSP is the key to the success of subsidence control in backfill-strip mining engineering. En, the width calculation models of the broken and plastic zones of three types of CSPs are established on the basis of limit equilibrium theory. On this basis, the mathematical model of the safety design width of the three types of CSPs is proposed to ensure the stability of CSP. An engineering case of stability width design of CSP is shown. is study can provide theoretical reference and technical support for the engineering design of backfill-strip mining
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