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- W2388896877 abstract "The main coal seam of Taiping colliery is 11~# coal seam with a thickness of 1.5 m.Being steep in dip angle(55°~63°) and soft in immediate roof and floor,the entries in this coal seam are hard to support and have obviously deformed.Based on site measurement,the actual deformation of the entry is asymmetric.The convergence of entry mainly comes from roof and floor sliding alone bedding planes.Through physical and numerical simulation on mining face 25113 of the entries in steep seam,the movement rule of surrounding rocks near the mining face is measured.On the basis of this,the deformation of gob-side retaining entry is usually asymmetric owing to the sliding of both roof and floor along the steep bedding plane.The failure mechanism of entry is mainly the tensional and shearing strain in steep layers.The important areas needing to be well supported are roof rib and upper floor rib-side.According to the deformation feature,the reasonable support way is thought to be the bolting system.So,it is suggested to design an asymmetric shape of the entry to cope with the sliding deformation of surrounding rocks.At last,the supporting design is put forward to optimize the entry shape so as to cope with the asymmetric deformation,and,after that,a proper bolting system is set up to form a reinforced bearing arch in the surrounding rock.This method is used in Taiping colliery and proved to be feasible." @default.
- W2388896877 created "2016-06-24" @default.
- W2388896877 creator A5039357398 @default.
- W2388896877 date "2006-01-01" @default.
- W2388896877 modified "2023-09-25" @default.
- W2388896877 title "Failure Mechanism of Entry in Steep Soft Seam and Bolting Design" @default.
- W2388896877 hasPublicationYear "2006" @default.
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