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- 저자 : Xuejun Xie (검색결과 2 건)
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Study on Blasting Characteristics of Shallow and Deep Soft-hard Rock Strata Based on Energy Field
Jianbin Cui,Liangfu Xie,Yongjun Qin,Xuejun Liu,Jiangu Qian 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.5
The expected blasting effect of rock mass is always affected by the soft-hard rock strata with anisotropic mechanical properties, especially under the influence of in-situ stress. Based on discrete element method (PFC2D), single-hole blasting experiments are carried out considering effect of soft-hard rock strata and in-situ stress. The result is analyzed from the perspectives of cracks state, cracks number, cracks extension range and energy fields. The results show that: 1) Under different in-situ stress fields, damage degree of rock mass increases first, then decreases rapidly and ultimately keeps stable with growth of soft rock thickness. Through fitting, better change laws are obtained. 2) When detonation in hard rock, if distance between blasthole and structural plane is larger than about 4 times the radius of crushing area, cracks development is restrained with the growth of in-situ stress. 3) Rock damage degree of rock firstly ascends and then descends with growth of Uniaxial Compressive Strength (UCS). Rock damage degree reaches maximum at about 40 MPa and descends with growth of in-situ stress, when it is greater than about 80 MPa. 4) When detonation in hard rock and lower in-situ stress, if structural plane is outside crushing area, peak kinetic energy will decrease with the growth of in-situ stress as well as peak friction energy, which is contrary to the peak strain energy.
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Research on the Relation between Transformer Oil Flow Electrification and Electrostatic Current
Qiang Fu,Rui Wang,Pinguo Zou,Zhao Li,Yang Yang,Xuejun Xie 대한전기학회 2015 Journal of Electrical Engineering & Technology Vol.10 No.2
In order to study and obtain the mathematical relation between the electrification degree of transformer oil flow and the electrostatic current, a small amount of data about the electrification degree of oil flow and the corresponding electrostatic current is studied by linear regression method and grey model method. The results show that the linear correlation between the electrification degree and the electrostatic current was not good, and the relation between the electrification degree of oil flow and electrostatic current (i) could be expressed as ρ<SUP>(0)</SUP> =0.2049 i<SUP>(0)</SUP> +169.4419 according to grey model GM (0, 2) when the electrification degree of oil flow is represented by the charge number generated from transformer oil per unit volume, namely the charge density (ρ).
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