基于流固耦合动态模型的煤层钻孔成拱特性研究
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摘要
为探讨煤层钻孔周围是否存在压力拱,构建了基于Hoek-Brown准则的含瓦斯煤流固耦合动态模型,并运用COMSOL软件进行解算,分析了钻孔施工前后孔周煤体主应力及应变能密度分布规律,研究了不同煤体结构煤层孔周煤体位移量及压力拱内边界、厚度的变化特征,并结合孔周煤体塑性区分布规律对煤层钻孔成拱特性进行了探讨。研究结果表明:煤层钻孔顶底部存在压力拱,其拱脚与拱座位于钻孔两侧;压力拱区域内孔周煤体水平位移量变化较为平缓;压力拱内边界及厚度可作为评判钻孔稳定性的指标,两者随地质强度指标GSI值的增大而逐渐减小,即煤体结构越完整、强度越高,压力拱范围越小;当GSI值非常大或非常小时,压力拱效应不明显,甚至趋于消失。
In order to investigate the existence of pressure arch around coalbed borehole,the fluid-solid coupling dynamic model of coal containing gas based on Hoek-Brown criterion was established and solved by COMSOL software.Then,the distribution law of principal stress and the strain energy density of coal body around borehole before and after drilling in coal seams was analyzed,the variation characteristics of horizontal displacement of coal body with different structure around borehole,the inner boundary and thickness of pressure arch were studied.Furthermore,the characteristics of pressure arch was discussed combined with the distribution law of plastic zone of coal body around borehole.Research results show that pressure arch exists at the top and bottom of coalbed borehole,the arch springing and abutments locate on both sides of borehole.The changing trend of horizontal displacement of coal body around borehole in pressure arch area is relatively gentle.The inner boundary and thickness of pressure arch can be used as two indexes to evaluate the stability of coalbed borehole,and they all decrease gradually with the increase of GSI value,that is,the more complete the coal structure is and the higher the strength is,the smaller the pressure arch range is.When GSI value is
In order to investigate the existence of pressure arch around coalbed borehole,the fluid-solid coupling dynamic model of coal containing gas based on Hoek-Brown criterion was established and solved by COMSOL software.Then,the distribution law of principal stress and the strain energy density of coal body around borehole before and after drilling in coal seams was analyzed,the variation characteristics of horizontal displacement of coal body with different structure around borehole,the inner boundary and thickness of pressure arch were studied.Furthermore,the characteristics of pressure arch was discussed combined with the distribution law of plastic zone of coal body around borehole.Research results show that pressure arch exists at the top and bottom of coalbed borehole,the arch springing and abutments locate on both sides of borehole.The changing trend of horizontal displacement of coal body around borehole in pressure arch area is relatively gentle.The inner boundary and thickness of pressure arch can be used as two indexes to evaluate the stability of coalbed borehole,and they all decrease gradually with the increase of GSI value,that is,the more complete the coal structure is and the higher the strength is,the smaller the pressure arch range is.When GSI value is
引文
[1]郑颖人,邱陈瑜.普氏压力拱理论的局限性[J].现代隧道技术,2016,53(2):1-8.ZHENG Yingren,QIU Chenyu.On the limitations of Protodyakonov’s pressure arch theory[J].Modern Tunnelling Technology,2016,53(2):1-8.
[2]徐泽沛,李夕兵.无衬砌隧道压力拱的变化规律[J].地下空间与工程学报,2017,13(1):141-145.XU Zepei,LI Xibing.Changing regulation of pressure arch for unlined tunnel[J].Chinese Journal of Underground Space and Engineering,2017,13(1):141-145.
[3]吴海科,刘远明,李汝嘉,等.隧道围岩压力拱研究进展[J].土木建筑与环境工程,2016,38(S2):64-69.WU Haike,LIU Yuanming,LI Rujia,et al.Advances in developments of tunnel pressure arch tests[J].Journal of Civil,Architectural&Environmental Engineering,2016,38(S2):64-69.
[4]郑康成,丁文其,金威,等.特大断面隧道分步施工动态压力拱分析研究[J].岩土工程学报,2015,37(S1):72-77.ZHENG Kangcheng,DING Wenqi,JIN Wei,et al.Experimental and numerical study on staged construction pressure arch of super large section tunnel[J].Chinese Journal of Geotechnical Engineering,2015,37(S1):72-77.
[5]杜晓丽,马芹永,宋宏伟,等.煤矿层状岩体压力拱演化规律的相似模拟[J].地下空间与工程学报,2017,13(2):381-386.DU Xiaoli,MA Qinyong,SONG Hongwei,et al.Simulation on evolution characteristics of the pressure arch in bedded rock at coal mining[J].Chinese Journal of Underground Space and Engineering,2017,13(2):381-386.
[6]杜晓丽,宋宏伟,陈杰.煤矿采矿围岩压力拱的演化特征数值模拟研究[J].中国矿业大学学报,2011,40(6):863-867.DU Xiaoli,SONG Hongwei,CHEN Jie.Numerical simulation of the evolution of the pressure arch during coal mining[J].Journal of China University of Mining&Technology,2011,40(6):863-867.
[7]杜晓丽,魏京胜,钱钢,等.煤矿采空区空间几何特征对岩石压力拱的影响[J].地下空间与工程学报,2015,11(S2):726-731.DU Xiaoli,WEI Jingsheng,QIAN Gang,et al.Influence of geometric features of coal mining area on the rock pressure arch[J].Chinese Journal of Underground Space and Engineering,2015,11(S2):726-731.
[8]张宏伟,吴文达,陈蓥,等.大同矿区综放开采覆岩压力拱演化规律研究[J].安全与环境学报,2017,17(1):67-71.ZHANG Hongwei,WU Wenda,CHEN Ying,et al.Research on the evolution regularity of the overlying stratum pressure arch in the fully mechanized top coal caving in the Datong coal mining area[J].Journal of Safety and Environment,2017,17(1):67-71.
[9]于斌,夏洪春,孟祥斌,等.特厚煤层综放开采顶煤成拱机理及除拱对策[J].煤炭学报,2016,41(7):1617-1623.YU Bin,XIA Hongchun,MENG Xiangbin,et al.Top coal arching mechanism and arch removal strategies in fully mechanized top coal caving mining of ultra-thick coal seam[J].Journal of China Coal Society,2016,41(7):1617-1623.
[10]白庆升,屠世浩,王沉.顶煤成拱机理的数值模拟研究[J].采矿与安全工程学报,2014,31(2):208-213.BAI Qingsheng,TU Shihao,WANG Chen.Numerical simulation on top-coal arching mechanism[J].Journal of Mining&Safety Engineering,2014,31(2):208-213.
[11]河南理工大学.煤矿井下钻孔的钻进、增透、修复与气驱置换综合方法,201210489910.1[P].2014-12-10.
[12]韩颖,张飞燕,杨志龙.基于H-B准则的含瓦斯煤流固耦合动态模型与数值模拟研究[C].煤矿岩层控制理论与技术进展-36届国际采矿岩层控制会议(中国·2017)论文集.淮南,2017:454-465.
[13]HOEK E,KAISER P K,BAWDEN W F.Support of underground excavations in hard rock[M].Rotterdam:A A Balkema,1995.
[14]郭红玉.基于水力压裂的煤矿井下瓦斯抽采理论与技术[D].焦作:河南理工大学,2011.
[2]徐泽沛,李夕兵.无衬砌隧道压力拱的变化规律[J].地下空间与工程学报,2017,13(1):141-145.XU Zepei,LI Xibing.Changing regulation of pressure arch for unlined tunnel[J].Chinese Journal of Underground Space and Engineering,2017,13(1):141-145.
[3]吴海科,刘远明,李汝嘉,等.隧道围岩压力拱研究进展[J].土木建筑与环境工程,2016,38(S2):64-69.WU Haike,LIU Yuanming,LI Rujia,et al.Advances in developments of tunnel pressure arch tests[J].Journal of Civil,Architectural&Environmental Engineering,2016,38(S2):64-69.
[4]郑康成,丁文其,金威,等.特大断面隧道分步施工动态压力拱分析研究[J].岩土工程学报,2015,37(S1):72-77.ZHENG Kangcheng,DING Wenqi,JIN Wei,et al.Experimental and numerical study on staged construction pressure arch of super large section tunnel[J].Chinese Journal of Geotechnical Engineering,2015,37(S1):72-77.
[5]杜晓丽,马芹永,宋宏伟,等.煤矿层状岩体压力拱演化规律的相似模拟[J].地下空间与工程学报,2017,13(2):381-386.DU Xiaoli,MA Qinyong,SONG Hongwei,et al.Simulation on evolution characteristics of the pressure arch in bedded rock at coal mining[J].Chinese Journal of Underground Space and Engineering,2017,13(2):381-386.
[6]杜晓丽,宋宏伟,陈杰.煤矿采矿围岩压力拱的演化特征数值模拟研究[J].中国矿业大学学报,2011,40(6):863-867.DU Xiaoli,SONG Hongwei,CHEN Jie.Numerical simulation of the evolution of the pressure arch during coal mining[J].Journal of China University of Mining&Technology,2011,40(6):863-867.
[7]杜晓丽,魏京胜,钱钢,等.煤矿采空区空间几何特征对岩石压力拱的影响[J].地下空间与工程学报,2015,11(S2):726-731.DU Xiaoli,WEI Jingsheng,QIAN Gang,et al.Influence of geometric features of coal mining area on the rock pressure arch[J].Chinese Journal of Underground Space and Engineering,2015,11(S2):726-731.
[8]张宏伟,吴文达,陈蓥,等.大同矿区综放开采覆岩压力拱演化规律研究[J].安全与环境学报,2017,17(1):67-71.ZHANG Hongwei,WU Wenda,CHEN Ying,et al.Research on the evolution regularity of the overlying stratum pressure arch in the fully mechanized top coal caving in the Datong coal mining area[J].Journal of Safety and Environment,2017,17(1):67-71.
[9]于斌,夏洪春,孟祥斌,等.特厚煤层综放开采顶煤成拱机理及除拱对策[J].煤炭学报,2016,41(7):1617-1623.YU Bin,XIA Hongchun,MENG Xiangbin,et al.Top coal arching mechanism and arch removal strategies in fully mechanized top coal caving mining of ultra-thick coal seam[J].Journal of China Coal Society,2016,41(7):1617-1623.
[10]白庆升,屠世浩,王沉.顶煤成拱机理的数值模拟研究[J].采矿与安全工程学报,2014,31(2):208-213.BAI Qingsheng,TU Shihao,WANG Chen.Numerical simulation on top-coal arching mechanism[J].Journal of Mining&Safety Engineering,2014,31(2):208-213.
[11]河南理工大学.煤矿井下钻孔的钻进、增透、修复与气驱置换综合方法,201210489910.1[P].2014-12-10.
[12]韩颖,张飞燕,杨志龙.基于H-B准则的含瓦斯煤流固耦合动态模型与数值模拟研究[C].煤矿岩层控制理论与技术进展-36届国际采矿岩层控制会议(中国·2017)论文集.淮南,2017:454-465.
[13]HOEK E,KAISER P K,BAWDEN W F.Support of underground excavations in hard rock[M].Rotterdam:A A Balkema,1995.
[14]郭红玉.基于水力压裂的煤矿井下瓦斯抽采理论与技术[D].焦作:河南理工大学,2011.