首页|Numerical modeling on strain energy evolution in rock system interaction with energy-absorbing prop and rock bolt
Numerical modeling on strain energy evolution in rock system interaction with energy-absorbing prop and rock bolt
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The interaction mechanism between coal and rock masses with supporting materials is significant in roadway control,especially in deep underground mining situations where dynamic hazards frequently happened due to high geo-stress and strong disturbed effects.This paper is to investigate the strain energy evolution in the interaction between coal and rock masses with self-designed energy-absorbing props and rock bolts by numerical modeling with the finite difference method.The interaction between rock and rock bolt/prop is accomplished by the cables element and the interface between the inner and outer props.Roadway excavation and coal extraction conditions in deep mining are numerically employed to investigate deformation,plastic zone ranges,strain energy input,accumulation,dissipation,and release.The effect on strain energy input,accumulation,dissipation,and release with rock deforma-tion,and the plastic zone is addressed.A ratio of strain energy accumulation,dissipation,and release with energy input α,β,γ is to assess the dynamic hazards.The effects on roadway excavation and coal extrac-tion steps of α,β,γ are discussed.The results show that:(1)In deep high geo-stress roadways,the energy-absorbing support system plays a dual role in resisting deformation and reducing the scope of plastic zones in surrounding rock,as well as absorbing energy release in the surrounding rock,especially in the coal extraction state to mitigate disturbed effects.(2)The strain energy input,accumulation is depen-dent on roadway deformation,the strain energy dissipation is relied on plastic zone area and disturbed effects,and strain energy release density is the difference among the three.The function of energy-absorbing rock bolts and props play a key role to mitigate strain energy release density and amount,espe-cially in coal extraction condition,with a peak density value from 4×104 to 1×104J/m3,and amount value from 3.57×108 to 1.90×106 J.(3)When mining is advanced in small steps,the strain energy accumulation is dominated.While in a large step,the released energy is dominant,thus a more dynamic hazards prone-ness.The energy-absorbing rock bolt and prop can reduce three times strain energy release amount,thus reducing the dynamic hazards.The results suggest that energy-absorbing props and rock bolts can effec-tively reduce the strain energy in the coal and rock masses,and prevent rock bursts and other hazards.The numerical model developed in this study can also be used to optimize the design of energy-absorbing props and rock bolts for specific mining conditions.
Strain energyCoal and rock massEnergy-absorbing prop and rock boltStrain energy evolution
Yang Hao、Chunhui Liu、Yu Wu、Hai Pu、Yanlong Chen、Lingling Shen、Guichen Li
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State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering,China University of Mining and Technology,Xuzhou 221116,China
School of Mechanics and Civil Engineering,China University of Mining and Technology,Xuzhou 221116,China
School of Mines,China University of Mining and Technology,Xuzhou 221116,China
National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNatural Science Foundation of Jiangsu ProvinceNational Key Research and Development Program of ChinaChina Postdoctoral Science FoundationShandong Postdoctoral Science Foundation
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