村庄下条带开采留设煤柱充填回采安全性研究
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摘要
为探究充填回采条带留设煤柱的安全可行性,首先,提出条带开采留设煤柱充填回采方案,通过理论计算充填体荷载及强度,分析充填体的稳定性;其次,根据条带开采后岩层移动情况确定预计参数,采用概率积分法计算充填回采后地表移动与变形,结合建筑物损坏等级评定标准,分析地表建筑受损情况,验证充填回采条带煤柱的适用性;最后,以佛店村庄下充填回采条带煤柱为实例进行分析。结果表明:条带充填体荷载22. 3 MPa,充填体强度31. 3 MPa,充填体安全系数1. 41,可使地表保持长期稳定。采用充填回采方案可将地表移动变形控制在Ⅱ级变形范围内,使地表建筑的正常使用不受影响。
In order to explore the safety and feasibility of miningtheretaining strip pillars with backfill,firstly,a backfill plan was proposed,and the stability of filling body was analyzed by calculating the load and strength of filling body. Then,the prediction parameters were determined according to the movement of rock strata after strip mining. The probability integral method was used to predict the surface movement and deformation after backfill. The damage to surface buildings was analyzed to verify the applicability of backfill with evaluation standards for building damage.Lastly,backfill mining strip pillars under the Fodian villages were taken as an example,researches on and analyses of which were carried out. The results show that the backfill load is 22. 3 MPa,the backfill strength is 31. 1 MPa,the backfill safety factor is 1.41,which can maintain long-term stability of the ground, and that the ground surface movement and deformation controlled by backfill is in the range of Ⅱ-level,and the normal use of the surface buildings will not be affected by backfill.
In order to explore the safety and feasibility of miningtheretaining strip pillars with backfill,firstly,a backfill plan was proposed,and the stability of filling body was analyzed by calculating the load and strength of filling body. Then,the prediction parameters were determined according to the movement of rock strata after strip mining. The probability integral method was used to predict the surface movement and deformation after backfill. The damage to surface buildings was analyzed to verify the applicability of backfill with evaluation standards for building damage.Lastly,backfill mining strip pillars under the Fodian villages were taken as an example,researches on and analyses of which were carried out. The results show that the backfill load is 22. 3 MPa,the backfill strength is 31. 1 MPa,the backfill safety factor is 1.41,which can maintain long-term stability of the ground, and that the ground surface movement and deformation controlled by backfill is in the range of Ⅱ-level,and the normal use of the surface buildings will not be affected by backfill.
引文
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[2]许家林,尤琪,朱卫兵,等.条带充填控制开采沉陷的理论研究[J].煤炭学报,2007,32(2):119-122.XU Jialin,YOU Qi,ZHU Weibing,et al. Theoretical study of strip-filling to control mining subsidence[J]. Journal of China Coal Society,2007,32(2):119-122.
[3]郝建,石永奎,隗峰,等.条带充填置换条带煤柱技术研究[J].湖南科技大学学报:自然科学版,2013,28(2):16-19.HAO Jian,SHI Yongkui,KUI Feng,et al. Study on technology of on replacing strip coal pillars by strip-filling mining[J].Journal of Hunan University of Science and Technology:Science Edition,2013,28(2):16-19.
[4]王光伟.膏体充填开采遗留条带煤柱的理论研究与实践[D].徐州:中国矿业大学,2014.WANG Guangwei. Research on theory and practice of mining legacy strip pillar with paste backfilling[D].Xuzhou:China University of Mining and Technology,2014.
[5]郭忠平,黄万朋.矸石倾斜条带充填体参数优化及其稳定性分析[J].煤炭学报,2011,36(2):234-238.GUO Zhongping,HUANG Wanpeng. Parameter optimization and stability analysis of inclined gangue strip-fillings[J].Journal of China Coal Society,2011,36(2):234-238.
[6]郭惟嘉,江宁,王海龙,等.膏体置换煤柱充填体承载特性及工作面支护强度研究[J].采矿与安全工程学报,2016,33(4):585-591.GUO Weijia,JIANG Ning,WANG Hailong,et al. Bearing characteristics of filling body and supporting intensity of working face during coal pillar mined with paste backfill[J]. Journal of Mining and Safety Engineering,2016,33(4):585-591.
[7]张兆江,张涛,张安兵,等.超高水材料充填条带开采地表沉陷规律研究[J].煤炭工程,2016,48(7):97-99.ZHANG Zhaojiang,ZHANG Tao,ZHANG Anbing,et al. Surface subsidence law for strip mining with super high-water material backfilling[J]. Coal Engineering,2016,48(7):97-99.
[8]赵庆彪,陈亚杰,周华强,等.小屯矿“建下”膏体充填综采研究[C].中国煤炭学会开采专业委员会2010年学术年会论文集,2010:49-57.
[9]董恩远.膏体条带充填开采充填体布置参数研究[D].太原:太原理工大学,2015.DONG Enyuan. Theoretical study on layout parameters of filling body in strip-filling mining technology using cementing[D].Taiyuan:Taiyuan University of Technology,2015.
[10]郭文兵,邓喀中,邹友峰.条带开采下沉系数计算与优化设计的神经网络模型[J].中国安全科学学报,2006,16(6):40-45.GUO Wenbing,DENG Kazhong,ZOU Youfeng. Calculation of subsidence factor in strip mining[J]. China Safety Science Journal,2006,16(6):40-45.
[11]张帅帅,尹土兵.基于FLAC3D的充填体内巷道稳定性分析[J].中国安全科学学报,2017,27(8):85-90.ZHANG Shuaishuai,YIN Tubing.Analysis of stability of tunnel in backfill based on FLAC3D[J]. China Safety Science Journal,2017,27(8):85-90.
[12]张华兴.煤矿开采损害的评价与防护[J].煤矿开采,2015,20(3):1-2.ZHANG Huaxing. Evaluation and prevention of mining subsidence in coal mines[J]. Coal Mining Technology,2015,20(3):1-2.
[13]邹友峰.条带开采优化设计及其地表沉陷预计的三围层状介质理论[M].北京:科学出版社,2011:35-38.