Abutment pressure distribution for longwall face mining through abandoned roadways
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摘要
Abutment pressure distribution is different when a longwall panel is passing through the abandoned gate roads in a damaged coal seam. According to the geological condition of panel E13103 in Cuijiazhai Coal Mine in China, theoretical analysis and finite element numerical simulation were used to determine the front pressure distribution characteristics when the longwall face is 70, 50, 30, 20, 10, and 5 m from the abandoned roadways. The research results show that the influence range of abutment pressure is 40 to 45 m outby the face, and the peak value of front abutment pressure is related to the distance between the face and abandoned roadways. When the distance between the longwall face and abandoned roadways is reduced from 50 to 10 m, the front abutment pressure peak value kept increasing. When the distance is 10 m, it has reached the maximum. The peak value is located in 5 to 6 m outby the faceline. When the distance between the longwall face and abandoned roadways is reduced from 10 to 5 m, the front abutment pressure sharply decreases, the intact coal yields and is even in plastic state. The peak value transfers to the other side of the abandoned roadways. The research results provide a theoretical basis for determining the advance support distance of two roadways in the panel and the reinforcement for face stability when the longwall face is passing through the abandoned roadways.
Abutment pressure distribution is different when a longwall panel is passing through the abandoned gate roads in a damaged coal seam. According to the geological condition of panel E13103 in Cuijiazhai Coal Mine in China, theoretical analysis and finite element numerical simulation were used to determine the front pressure distribution characteristics when the longwall face is 70, 50, 30, 20, 10, and 5 m from the abandoned roadways. The research results show that the influence range of abutment pressure is 40 to 45 m outby the face, and the peak value of front abutment pressure is related to the distance between the face and abandoned roadways. When the distance between the longwall face and abandoned roadways is reduced from 50 to 10 m, the front abutment pressure peak value kept increasing. When the distance is 10 m, it has reached the maximum. The peak value is located in 5 to 6 m outby the faceline. When the distance between the longwall face and abandoned roadways is reduced from 10 to 5 m, the front abutment pressure sharply decreases, the intact coal yields and is even in plastic state. The peak value transfers to the other side of the abandoned roadways. The research results provide a theoretical basis for determining the advance support distance of two roadways in the panel and the reinforcement for face stability when the longwall face is passing through the abandoned roadways.
Abutment pressure distribution is different when a longwall panel is passing through the abandoned gate roads in a damaged coal seam. According to the geological condition of panel E13103 in Cuijiazhai Coal Mine in China, theoretical analysis and finite element numerical simulation were used to determine the front pressure distribution characteristics when the longwall face is 70, 50, 30, 20, 10, and 5 m from the abandoned roadways. The research results show that the influence range of abutment pressure is 40 to 45 m outby the face, and the peak value of front abutment pressure is related to the distance between the face and abandoned roadways. When the distance between the longwall face and abandoned roadways is reduced from 50 to 10 m, the front abutment pressure peak value kept increasing. When the distance is 10 m, it has reached the maximum. The peak value is located in 5 to 6 m outby the faceline. When the distance between the longwall face and abandoned roadways is reduced from 10 to 5 m, the front abutment pressure sharply decreases, the intact coal yields and is even in plastic state. The peak value transfers to the other side of the abandoned roadways. The research results provide a theoretical basis for determining the advance support distance of two roadways in the panel and the reinforcement for face stability when the longwall face is passing through the abandoned roadways.
引文
[1]Li Y.Overburden movement in solid waste rock cemented backfill mining methods.J China Coal Soc 2011;36(s2):370-4.
[2]Li Y,Zhu EG,Zhang KN,Qi BD.Mining methods and roof caving mechanism in longwall mining through the abandoned gateroads of small mines.J China Coal Soc 2017;42(s1):16-23.
[3]Wang H,Jiang YD,Zhao YX,Zhu J,Liu S.Numerical investigation of the dynamic mechanical state of a coal pillar during longwall mining panel extraction.Rock Mech Rock Eng 2013;46(5):1211-21.
[4]Liu JH,Jiang FX,Tao F.Numerical simulation of abutment pressure distribution of C-shaped stope.Rock Soil Mech 2010;31(12):4011-5.
[5]Jia JH,Kang HP,Zhang XR.Evaluation of coal pillar loads during longwall extraction using the numerical method and its ap-plication.Int J Min Sci Technol 2013;19(3):269-75.
[6]Li Y.Groundwater system for the periods of pre-and post-longwall mining over thin overburden.Int J Min Reclam Env 2016;30(4):295-311.
[7]Wu H,Zhang N,Wang W,Zhao Y,Cao P.Characteristics of deformation and stress distribution of small coal pillars under leading abutment pressure.Int JMin Sci Technol 2015;25(6):921-6.
[8]Guy R,Kent M,Russell F.An assessment of coal pillar system stability criteria based on a mechanistic evaluation of the inter-action between coal pillars and the overburden.Int.J Min Sci Technol 2017;27(1):9-15.
[9]Ren YF,Ning Y.Changing feature of advancing abutment pressure in shallow long wall working face.J China Coal Soc 2014;39(S1).pp.38-42(5).
[10]Xue Y,Gao F,Liu X,Liang X.Permeability and pressure distribution characteristics of the roadway surrounding rock in the damaged zone of an excavation.Int J Min Sci Technol 2017;27(2):211-9.
[11]Wattimena R,Kramadibrata S,Sidi I,Azizi M.Developing coal pillar stability chart using logistic regression.Int J Roc Mech Min Sci 2013;58:55-60.
[12]Cheng YH,Jiang FX,Zou YH.Research on inversion high mining pressure distribution and technology of preventing dynam-ic disasters by MSmonitoring in longwall face.Int J Coal Sci Technol 2009;15(3):252-7.
[13]Jiang FX,Ma QJ.Mechanical solution of the maximum point of dynamic abutment pressure under deep long-wall face.J China Coal Soc 2002;27(3):273-5.
[2]Li Y,Zhu EG,Zhang KN,Qi BD.Mining methods and roof caving mechanism in longwall mining through the abandoned gateroads of small mines.J China Coal Soc 2017;42(s1):16-23.
[3]Wang H,Jiang YD,Zhao YX,Zhu J,Liu S.Numerical investigation of the dynamic mechanical state of a coal pillar during longwall mining panel extraction.Rock Mech Rock Eng 2013;46(5):1211-21.
[4]Liu JH,Jiang FX,Tao F.Numerical simulation of abutment pressure distribution of C-shaped stope.Rock Soil Mech 2010;31(12):4011-5.
[5]Jia JH,Kang HP,Zhang XR.Evaluation of coal pillar loads during longwall extraction using the numerical method and its ap-plication.Int J Min Sci Technol 2013;19(3):269-75.
[6]Li Y.Groundwater system for the periods of pre-and post-longwall mining over thin overburden.Int J Min Reclam Env 2016;30(4):295-311.
[7]Wu H,Zhang N,Wang W,Zhao Y,Cao P.Characteristics of deformation and stress distribution of small coal pillars under leading abutment pressure.Int JMin Sci Technol 2015;25(6):921-6.
[8]Guy R,Kent M,Russell F.An assessment of coal pillar system stability criteria based on a mechanistic evaluation of the inter-action between coal pillars and the overburden.Int.J Min Sci Technol 2017;27(1):9-15.
[9]Ren YF,Ning Y.Changing feature of advancing abutment pressure in shallow long wall working face.J China Coal Soc 2014;39(S1).pp.38-42(5).
[10]Xue Y,Gao F,Liu X,Liang X.Permeability and pressure distribution characteristics of the roadway surrounding rock in the damaged zone of an excavation.Int J Min Sci Technol 2017;27(2):211-9.
[11]Wattimena R,Kramadibrata S,Sidi I,Azizi M.Developing coal pillar stability chart using logistic regression.Int J Roc Mech Min Sci 2013;58:55-60.
[12]Cheng YH,Jiang FX,Zou YH.Research on inversion high mining pressure distribution and technology of preventing dynam-ic disasters by MSmonitoring in longwall face.Int J Coal Sci Technol 2009;15(3):252-7.
[13]Jiang FX,Ma QJ.Mechanical solution of the maximum point of dynamic abutment pressure under deep long-wall face.J China Coal Soc 2002;27(3):273-5.