无巷旁充填支护沿空留巷顶板断裂位置研究
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摘要
针对葛泉矿1528工作面无巷旁充填沿空留巷顶板控制难题,通过建立煤层界面应力力学模型和留巷煤体塑性区演化数值模型对基本顶断裂位置进行了力学解析和数值计算,结合基本顶断裂位置影响因素关键性分析,提出了无巷旁充填沿空留巷强力切顶支架围岩控制技术。研究结果表明:距留巷煤壁2.4 m位置基本顶开始塑性破坏,且剪应力达到最大值,数值模拟结果与基于煤体弹塑性交汇位置计算得到的基本顶断裂位置基本吻合;基本顶断裂位置关键影响因素为煤层厚度、开采深度、煤层界面力学性质及应力集中系数;沿空留巷采空一侧由π型钢梁和单体液压支柱构成的强力切顶支架改变了基本顶的切落位置,卸压作用显著,保障了无巷旁充填沿空留巷的安全稳定,为地质生产条件相似矿井提供给了技术借鉴。
According to the roof support problem of the gateway retained along the goaf with no gateway sidewall backfilling and support in No. 1528 coal mining face of Gequan Mine,the roof fracture position that in theory and numerical simulation and the technology of cutting roof are studied in order to improve roof status. The results show that a mechanical model of the seam interface stress is established based on the law of plastic area stress distribution. The roof fracture position in elastic-plastic intersection is derived. The simulation results show that the maximum shear stress is in 2.4 m,at the same time,the main roof began to plastic failure in 2.4 m. Based on the analysis of influencing factors that main roof fracture position,the coal thickness,mining depth,the mechanical properties of coal interface and stress concentration factor has great influence. In order to cutting roof reasonable,adopted strength combination support to curtting roof and observed the fracture line. It proved that the supporting is effective to form rational overhang length of the roof. The research provides a reference for stable control of surrounding rock of the gob-side entry retaining with no roadside filling support.
According to the roof support problem of the gateway retained along the goaf with no gateway sidewall backfilling and support in No. 1528 coal mining face of Gequan Mine,the roof fracture position that in theory and numerical simulation and the technology of cutting roof are studied in order to improve roof status. The results show that a mechanical model of the seam interface stress is established based on the law of plastic area stress distribution. The roof fracture position in elastic-plastic intersection is derived. The simulation results show that the maximum shear stress is in 2.4 m,at the same time,the main roof began to plastic failure in 2.4 m. Based on the analysis of influencing factors that main roof fracture position,the coal thickness,mining depth,the mechanical properties of coal interface and stress concentration factor has great influence. In order to cutting roof reasonable,adopted strength combination support to curtting roof and observed the fracture line. It proved that the supporting is effective to form rational overhang length of the roof. The research provides a reference for stable control of surrounding rock of the gob-side entry retaining with no roadside filling support.
引文
[1]李化敏.沿空留巷顶板岩层控制设计[J].岩石力学与工程学报,2000,19(5):651-654.LI Huamin. Control design of roof rocks for gob-side entry[J].Chinese Journal of Rock Mechanics and Engineering,2000,19(5):651-654.
[2]石建军,师皓宇.沿空留巷矿压显现规律模拟研究[J].中国煤炭,2012,38(10):42-44.SHI Jianjun,SHI Haoyu.A simulation on the law of mine pressure behavior of the roof fracture about the gob-side entry retaining and the numerical[J].China Coal,2012,38(10):42-44.
[3]石建军,马念杰,白忠胜.沿空留巷顶板断裂位置分析及支护技术[J].煤炭科学技术,2013,41(7):35-42.SHI Jianjun,MA Nianjie,BAI Zhongsheng. Study on the roof fracture about the gob-side entry retaining and the supporting technology[J]. Coal Science and Technology,2013,41(7):35-42.
[4]马念杰,侯朝炯.采准巷道矿压理论及应用[M].徐州:中国矿业大学出版社,1995:82-91.
[5]李胜,李军文,范超军.综放沿空留巷顶板下沉规律与控制[J].煤炭学报,2015,40(9):1989-1994.LI Sheng,LI Junwen,FAN Chaojun. Roof subsidence laws and control technology for gob-side entry retaining in fully-mechanized top coal caving face[J].Journal of China Coal Society,2015,40(9):1989-1994.
[6]王卫军,侯朝炯,柏建彪.综放沿空巷道顶煤受力变形分析[J].岩土工程学报,2001,23(2):209-211.WANG Weijun,HOU Chaojiong,BAI Jianbiao. Mechanical deformation analysis of the roof coal of road driving along next goaf in sublevel caving face[J]. Chinese Journal of Geotechnical Engineering,2001,23(2):209-211.
[7]孙晓明,刘鑫,梁广峰.薄煤层切顶卸压沿空留巷关键参数研究[J].岩石力学与工程学报,2014,33(7):1449-1456.SUN Xiaoming,LIU Xin,LIANG Guangfeng.Key parameters of gob-side entry retaining formed by roof cut and pressure releasing in thin coal seams[J].Chinese Journal of Rock Mechanics and Engineering,2014,33(7):1449-1456.
[8]武精科,阚甲广,谢生荣,等.深井沿空留巷非对称破坏机制与控制技术研究[J].采矿与安全工程学报,2017,34(4):739-747.WU Jingke,KAN Jiaguang,XIE Shengrong,et al.Key parameters of gob-side entry retaining formed by roof cut and pressure releasing in thin coal seams[J]. Journal of Mining&Safety Engineering,2017,34(4):739-747.
[9]张自政,柏建彪,王卫军.沿空留巷充填区域直接顶受力状态探讨与应用[J].煤炭学报,2017,42(8):1960-1970.ZHANG Zizheng,BAI Jianbiao,WANG Weijun. Study on stress state of immediate roof above back fill area in-gob-side entry retaining and its application[J]. Journal of China Coal Society,2017,42(8):1960-1970.
[10]张自政,柏建彪,陈勇.浅孔爆破机制及其在厚层坚硬顶板沿空留巷中的应用[J].岩石力学与工程学报,2016,35(S1):3008-3017.ZHANG Zizheng,BAI Jianbiao,CHEN Yong.Shallow-hole blasting mechanism and its application for gob-side entry retaining with thick and hard roof[J]. Chinese Journal of Rock Mechanics and Engineering,2016,35(S1):3008-3017.
[11]蔡峰,苗沛沛,王二雨,等.厚层灰岩直接顶沿空成巷切顶断裂条件及围岩移动规律研究[J].采矿与安全工程学报,2017,34(3):488-494.CAI Feng,MIAO Peipei,WANG Eryu,et al. Fracture condition and moving rule of surrounding rocks in the joint cutting immediate roof of thick-layer limestone[J]. Journal of Mining&Safety Engineering,2017,34(3):488-494.
[12]洛锋,曹树刚,李国栋,.煤层巷道围岩破断失稳演化特征和分区支护研究[J].采矿与安全工程学报,2017,34(3):479-487.LUO Feng,CAO Shugang,LI Guodong,LI Yong,et al. Evolution characteristics of fracture and instability in coal roadways and sub-regional supporting[J].Journal of Mining&Safety Engineering,2017,34(3):479-487.
[13]韩昌良.沿空留巷围岩应力优化与结构稳定控制[D].徐州:中国矿业大学,2015.
[14]汤雷,王五平.锚杆支护与围岩共同承载的协调性[J].煤炭学报,2004,29(1):12-16.TANG Lei,WANG Wuping.Coordination between bolting support and surrounding rock affected by ground pressure[J]. Journal of China Coal Society,2004,29(1):12-16.
[2]石建军,师皓宇.沿空留巷矿压显现规律模拟研究[J].中国煤炭,2012,38(10):42-44.SHI Jianjun,SHI Haoyu.A simulation on the law of mine pressure behavior of the roof fracture about the gob-side entry retaining and the numerical[J].China Coal,2012,38(10):42-44.
[3]石建军,马念杰,白忠胜.沿空留巷顶板断裂位置分析及支护技术[J].煤炭科学技术,2013,41(7):35-42.SHI Jianjun,MA Nianjie,BAI Zhongsheng. Study on the roof fracture about the gob-side entry retaining and the supporting technology[J]. Coal Science and Technology,2013,41(7):35-42.
[4]马念杰,侯朝炯.采准巷道矿压理论及应用[M].徐州:中国矿业大学出版社,1995:82-91.
[5]李胜,李军文,范超军.综放沿空留巷顶板下沉规律与控制[J].煤炭学报,2015,40(9):1989-1994.LI Sheng,LI Junwen,FAN Chaojun. Roof subsidence laws and control technology for gob-side entry retaining in fully-mechanized top coal caving face[J].Journal of China Coal Society,2015,40(9):1989-1994.
[6]王卫军,侯朝炯,柏建彪.综放沿空巷道顶煤受力变形分析[J].岩土工程学报,2001,23(2):209-211.WANG Weijun,HOU Chaojiong,BAI Jianbiao. Mechanical deformation analysis of the roof coal of road driving along next goaf in sublevel caving face[J]. Chinese Journal of Geotechnical Engineering,2001,23(2):209-211.
[7]孙晓明,刘鑫,梁广峰.薄煤层切顶卸压沿空留巷关键参数研究[J].岩石力学与工程学报,2014,33(7):1449-1456.SUN Xiaoming,LIU Xin,LIANG Guangfeng.Key parameters of gob-side entry retaining formed by roof cut and pressure releasing in thin coal seams[J].Chinese Journal of Rock Mechanics and Engineering,2014,33(7):1449-1456.
[8]武精科,阚甲广,谢生荣,等.深井沿空留巷非对称破坏机制与控制技术研究[J].采矿与安全工程学报,2017,34(4):739-747.WU Jingke,KAN Jiaguang,XIE Shengrong,et al.Key parameters of gob-side entry retaining formed by roof cut and pressure releasing in thin coal seams[J]. Journal of Mining&Safety Engineering,2017,34(4):739-747.
[9]张自政,柏建彪,王卫军.沿空留巷充填区域直接顶受力状态探讨与应用[J].煤炭学报,2017,42(8):1960-1970.ZHANG Zizheng,BAI Jianbiao,WANG Weijun. Study on stress state of immediate roof above back fill area in-gob-side entry retaining and its application[J]. Journal of China Coal Society,2017,42(8):1960-1970.
[10]张自政,柏建彪,陈勇.浅孔爆破机制及其在厚层坚硬顶板沿空留巷中的应用[J].岩石力学与工程学报,2016,35(S1):3008-3017.ZHANG Zizheng,BAI Jianbiao,CHEN Yong.Shallow-hole blasting mechanism and its application for gob-side entry retaining with thick and hard roof[J]. Chinese Journal of Rock Mechanics and Engineering,2016,35(S1):3008-3017.
[11]蔡峰,苗沛沛,王二雨,等.厚层灰岩直接顶沿空成巷切顶断裂条件及围岩移动规律研究[J].采矿与安全工程学报,2017,34(3):488-494.CAI Feng,MIAO Peipei,WANG Eryu,et al. Fracture condition and moving rule of surrounding rocks in the joint cutting immediate roof of thick-layer limestone[J]. Journal of Mining&Safety Engineering,2017,34(3):488-494.
[12]洛锋,曹树刚,李国栋,.煤层巷道围岩破断失稳演化特征和分区支护研究[J].采矿与安全工程学报,2017,34(3):479-487.LUO Feng,CAO Shugang,LI Guodong,LI Yong,et al. Evolution characteristics of fracture and instability in coal roadways and sub-regional supporting[J].Journal of Mining&Safety Engineering,2017,34(3):479-487.
[13]韩昌良.沿空留巷围岩应力优化与结构稳定控制[D].徐州:中国矿业大学,2015.
[14]汤雷,王五平.锚杆支护与围岩共同承载的协调性[J].煤炭学报,2004,29(1):12-16.TANG Lei,WANG Wuping.Coordination between bolting support and surrounding rock affected by ground pressure[J]. Journal of China Coal Society,2004,29(1):12-16.