Research on the width of filling body in gob-side entry retaining with high-water materials
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摘要
To determine the filling body's width along the gob-side remained roadway which is underneath the gob,the authors analyzed the interaction mechanism between the roof and the supporting body along the remained roadway, based on the elastic thin plate theory of the stope roof. The stress state and mechanical response of the filling body along the remained roadway were studied. Specifically, firstly, the supporting pressure of the coal pillar which is on one side of the gob-side remained roadway was deduced.Also, an equation that is used to calculate the width of the balance area in the stress limit state was acquired. Then, an equation that is used to calculate the roof cutting force on one side of the supporting body was obtained. By using FLAC3D, the authors investigated the displacement field and stress field response laws of rock masses around the roadway with different filling body's widths. The results show that with the filling body's width increasing, the supporting ability of the filling body increases.Meanwhile, the rock mass displacement around the roadway and the filling body deformation decrease.The better the filling body's supporting effect is, the higher the roof cutting force will be. When the filling body's width is larger than 3.0 m, its internal bearing ability becomes stable and the filling body's deformation became non-apparent. Finally, analysis shows that the filling body's width should be 2.5 m.Furthermore, the authors conducted field tests in the supply roadway 1204, using high-water materials and acquired expected outcomes.
To determine the filling body's width along the gob-side remained roadway which is underneath the gob,the authors analyzed the interaction mechanism between the roof and the supporting body along the remained roadway, based on the elastic thin plate theory of the stope roof. The stress state and mechanical response of the filling body along the remained roadway were studied. Specifically, firstly, the supporting pressure of the coal pillar which is on one side of the gob-side remained roadway was deduced.Also, an equation that is used to calculate the width of the balance area in the stress limit state was acquired. Then, an equation that is used to calculate the roof cutting force on one side of the supporting body was obtained. By using FLAC3D, the authors investigated the displacement field and stress field response laws of rock masses around the roadway with different filling body's widths. The results show that with the filling body's width increasing, the supporting ability of the filling body increases.Meanwhile, the rock mass displacement around the roadway and the filling body deformation decrease.The better the filling body's supporting effect is, the higher the roof cutting force will be. When the filling body's width is larger than 3.0 m, its internal bearing ability becomes stable and the filling body's deformation became non-apparent. Finally, analysis shows that the filling body's width should be 2.5 m.Furthermore, the authors conducted field tests in the supply roadway 1204, using high-water materials and acquired expected outcomes.
To determine the filling body's width along the gob-side remained roadway which is underneath the gob,the authors analyzed the interaction mechanism between the roof and the supporting body along the remained roadway, based on the elastic thin plate theory of the stope roof. The stress state and mechanical response of the filling body along the remained roadway were studied. Specifically, firstly, the supporting pressure of the coal pillar which is on one side of the gob-side remained roadway was deduced.Also, an equation that is used to calculate the width of the balance area in the stress limit state was acquired. Then, an equation that is used to calculate the roof cutting force on one side of the supporting body was obtained. By using FLAC3D, the authors investigated the displacement field and stress field response laws of rock masses around the roadway with different filling body's widths. The results show that with the filling body's width increasing, the supporting ability of the filling body increases.Meanwhile, the rock mass displacement around the roadway and the filling body deformation decrease.The better the filling body's supporting effect is, the higher the roof cutting force will be. When the filling body's width is larger than 3.0 m, its internal bearing ability becomes stable and the filling body's deformation became non-apparent. Finally, analysis shows that the filling body's width should be 2.5 m.Furthermore, the authors conducted field tests in the supply roadway 1204, using high-water materials and acquired expected outcomes.
引文
[1]Xie HP,Qian MG,Peng SP,Hu XS,Cheng YQ,Zhou HW.Sustainable capacity of coalmining and its strategic plan.Eng Sci 2011;13(6):44–50.
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[3]Yao GY.Outlook on technology of quick tunneling.Min Process Equip 2004;32(9):18–9.
[4]Zhu T,Zhang BS,Feng GR,Zhang XY,Kang LX.Roof structure and control in the lower seam mining field in the ultra-close multiple seams.J China Coal Soc2010;35(2):190–3.
[5]Qi QX,Ji WB,Yuan JB,Cheng ZH,Liu XG.In-situ observation on the floorconnected crack field and its effects on methane extraction.J China Coal Soc2014;39(8):1552–8.
[6]Zhang YJ,Yu GM,Lu SB,Li L,Yang DF.Numerical analysis of gas flow law with short distance upper protective layer gas extraction.Rock Soil Mech2010;31:398–404.
[7]Ma GQ,Chen RZ,Cui G,Liu NN,Li L.Gas comprehensive control technology of upper protective seam in contiguous outburst seams.Coal Sci Technol 2015;43(3):52–5.
[8]Zhou HD,Xu JL,Hu GZ.Effect analysis on gas control with local high level gas drainage gateway at initial mining period of fully mechanized top coal caving mining face.Coal Sci Technol 2012;5:55–9.
[9]Zhang N,Han CL,Kan JG.Theory and practice of surrounding rock control for pillar-less gob-side entry retaining.J China Coal Soc 2014;8:1635–41.
[10]Hua XZ.Development status and improved proposals on gob-side entry retaining support technology in China.Coal Sci Technol 2006;12:78–81.
[11]Li YF,Hua XZ.The stability of key block and calculating the width of roadside backfill in a secondary gob-side entry retaining.J Min Saf Eng 2012;6:783–9.
[12]Ma ZG,Gong P,Fan JQ.Coupling mechanism of roof and supporting wall in gob-side entry retaining in fully-mechanized mining with gangue backfilling.Int J Min Sci Technol 2011;21:829–33.
[13]Deng YH,Tang JX,Zhu XK.Analysis and application in controlling surrounding rock of support reinforced roadway in gob side entry with fully mechanized mining.Int J Min Sci Technol 2010;20(5):839–45.
[14]Zhou BJ,Xu JH,Zhao MS.Stability study on naturally filling body in gob-side entry retaining.Int J Min Sci Technol 2012;22(3):423–7.
[15]Li HM.Control design of roof rocks for gob-side entry.Chin J Rock Mech Eng2000;19(5):651–4.
[16]Lu XY,Hua XZ,Zhao MQ.Calculation and analysis of immediate roof subsidence in Gob Side Entry Retaining.J Min Saf Eng 2011;28(1):34–8.
[17]Chen Y,Bai JB,Zhu TL,Yan S,Zhao SH,Li XC.Mechanisms of roadside support in gob-side entry retaining and its application.Rock Soil Mech 2012;33(5):1427–32.
[18]Li X,Wang HZ,Li SP,Fu XR,Jiang XG.Element for beam on Winkler elastic foundation based on analytical trial functions.Eng Mech 2015;3:66–72.
[19]Wang HW,Chen ZH,Tu ZC,Li JW.Application of elastic thin plate theory to change rule of roof in underground stope.Chin J Rock Mech Eng 2006:S2.
[20]Liu CL,Tan ZX,Deng KZ.Synergistic instability of coal pillar and roof system and filling method based on plate model.Int J Min Sci Technol 2013;23(1):145–9.
[21]Jiang HJ,Cao SG,Zhang Y.Analytical solutions of hard roof’s bending moment,deflection and energy under the front abutment pressure before periodic weighting.Int J Min Sci Technol 2016;26(2):175–81.
[22]Chen YM,Xu DP.The foundation and engineering examples of FLAC/FLAC3D.Beijing:China Water Conservancy and Hydropower Press;2008.
[2]Niu BY.Mining anchor,excavation and anchor integration fast tunneling technology.Coal Eng 2004;11:9–12.
[3]Yao GY.Outlook on technology of quick tunneling.Min Process Equip 2004;32(9):18–9.
[4]Zhu T,Zhang BS,Feng GR,Zhang XY,Kang LX.Roof structure and control in the lower seam mining field in the ultra-close multiple seams.J China Coal Soc2010;35(2):190–3.
[5]Qi QX,Ji WB,Yuan JB,Cheng ZH,Liu XG.In-situ observation on the floorconnected crack field and its effects on methane extraction.J China Coal Soc2014;39(8):1552–8.
[6]Zhang YJ,Yu GM,Lu SB,Li L,Yang DF.Numerical analysis of gas flow law with short distance upper protective layer gas extraction.Rock Soil Mech2010;31:398–404.
[7]Ma GQ,Chen RZ,Cui G,Liu NN,Li L.Gas comprehensive control technology of upper protective seam in contiguous outburst seams.Coal Sci Technol 2015;43(3):52–5.
[8]Zhou HD,Xu JL,Hu GZ.Effect analysis on gas control with local high level gas drainage gateway at initial mining period of fully mechanized top coal caving mining face.Coal Sci Technol 2012;5:55–9.
[9]Zhang N,Han CL,Kan JG.Theory and practice of surrounding rock control for pillar-less gob-side entry retaining.J China Coal Soc 2014;8:1635–41.
[10]Hua XZ.Development status and improved proposals on gob-side entry retaining support technology in China.Coal Sci Technol 2006;12:78–81.
[11]Li YF,Hua XZ.The stability of key block and calculating the width of roadside backfill in a secondary gob-side entry retaining.J Min Saf Eng 2012;6:783–9.
[12]Ma ZG,Gong P,Fan JQ.Coupling mechanism of roof and supporting wall in gob-side entry retaining in fully-mechanized mining with gangue backfilling.Int J Min Sci Technol 2011;21:829–33.
[13]Deng YH,Tang JX,Zhu XK.Analysis and application in controlling surrounding rock of support reinforced roadway in gob side entry with fully mechanized mining.Int J Min Sci Technol 2010;20(5):839–45.
[14]Zhou BJ,Xu JH,Zhao MS.Stability study on naturally filling body in gob-side entry retaining.Int J Min Sci Technol 2012;22(3):423–7.
[15]Li HM.Control design of roof rocks for gob-side entry.Chin J Rock Mech Eng2000;19(5):651–4.
[16]Lu XY,Hua XZ,Zhao MQ.Calculation and analysis of immediate roof subsidence in Gob Side Entry Retaining.J Min Saf Eng 2011;28(1):34–8.
[17]Chen Y,Bai JB,Zhu TL,Yan S,Zhao SH,Li XC.Mechanisms of roadside support in gob-side entry retaining and its application.Rock Soil Mech 2012;33(5):1427–32.
[18]Li X,Wang HZ,Li SP,Fu XR,Jiang XG.Element for beam on Winkler elastic foundation based on analytical trial functions.Eng Mech 2015;3:66–72.
[19]Wang HW,Chen ZH,Tu ZC,Li JW.Application of elastic thin plate theory to change rule of roof in underground stope.Chin J Rock Mech Eng 2006:S2.
[20]Liu CL,Tan ZX,Deng KZ.Synergistic instability of coal pillar and roof system and filling method based on plate model.Int J Min Sci Technol 2013;23(1):145–9.
[21]Jiang HJ,Cao SG,Zhang Y.Analytical solutions of hard roof’s bending moment,deflection and energy under the front abutment pressure before periodic weighting.Int J Min Sci Technol 2016;26(2):175–81.
[22]Chen YM,Xu DP.The foundation and engineering examples of FLAC/FLAC3D.Beijing:China Water Conservancy and Hydropower Press;2008.