巷道交叉段围岩变形规律及安全度分析
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摘要
以某矿井为工程背景,建立不同交叉情况的数值模型,分析了不同交叉情况下的巷道围岩变形规律,并且引入了同时考虑压剪破坏和拉伸破坏的单元安全计算方法来分析交叉段围岩的安全状况。结果表明:巷道交叉段的围岩变形有向锐角一侧偏移的现象,交叉角度越小偏移程度越明显。交叉角度越小,交叉段主巷锐角侧需要进行加强支护的范围越大。由于巷道交叉扩大了围岩扰动,巷道交叉段的顶、底板安全系数都比较低,安全系数小于1的区域要大于巷道其他部位。而拐角岩柱的安全度则由外而内呈梯度变化,拐角岩柱外侧的岩体安全系数最低,将最先发生破坏,然后逐渐向内部发展。交叉角度过小时,锐角侧拐角岩柱破坏面积所占比率较大,不利于巷道稳定性。所得结果可以为类似条件下的巷道支护提供依据。
In this paper,taking one mine as the engineering background,different numerical models of roadway intersection were established,and the deformation laws of surrounding rock in different roadway intersections were analyzed.Meanwhile,the security analysis method which both considering shear and tensile damages was used to analyze the security situation of surrounding rocks in roadway intersection.The results show that the surrounding rock deformation of roadway intersection shows different offset degrees to the acute angle side,and the smaller the intersection angle is,the more obvious the offset phenomenon is.Thus,the smaller the intersection angle is,the larger the scope needed to strengthen support in the acute angle side of roadway intersection.Meanwhile,due to the enlargement of disturbance to surrounding rock in roadway intersection,the roof and floor safety coefficient are relatively low in roadway intersection,and the regions where the safety coefficients is less than 1 are greater than other parts of roadway.Moreover,the safety coefficient of corner rock pillar from exterior to interior shows gradient changes,and the safety coefficient of rock mass outside the corner rock pillar is the smallest,which will be damaged first,and then develops gradually to the internal.When the intersection angle is too small,the percentage of damage area of corner rock pillar in the acute angle side is relatively larger,which is not beneficial to the stability of roadway.The results can provide reasonable references to roadway support in similar engineering conditions.
In this paper,taking one mine as the engineering background,different numerical models of roadway intersection were established,and the deformation laws of surrounding rock in different roadway intersections were analyzed.Meanwhile,the security analysis method which both considering shear and tensile damages was used to analyze the security situation of surrounding rocks in roadway intersection.The results show that the surrounding rock deformation of roadway intersection shows different offset degrees to the acute angle side,and the smaller the intersection angle is,the more obvious the offset phenomenon is.Thus,the smaller the intersection angle is,the larger the scope needed to strengthen support in the acute angle side of roadway intersection.Meanwhile,due to the enlargement of disturbance to surrounding rock in roadway intersection,the roof and floor safety coefficient are relatively low in roadway intersection,and the regions where the safety coefficients is less than 1 are greater than other parts of roadway.Moreover,the safety coefficient of corner rock pillar from exterior to interior shows gradient changes,and the safety coefficient of rock mass outside the corner rock pillar is the smallest,which will be damaged first,and then develops gradually to the internal.When the intersection angle is too small,the percentage of damage area of corner rock pillar in the acute angle side is relatively larger,which is not beneficial to the stability of roadway.The results can provide reasonable references to roadway support in similar engineering conditions.
引文
[1]东兆星,吴士良.井巷工程[M].徐州:中国矿业大学出版社,2004.
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[5]柴华彬,张彦宾,程立朝,等.深部巷道交岔点围岩变形及稳定性研究[J].采矿与安全工程学报,2010,27(2):200-204.CHAI Hua-bin,ZHANG Yan-bin,CHENG Li-chao,et al.Research on deformation and stability of wall rocksin intersection of laneway in deep mine[J].Journal ofMining&Safety Engineering,2010,27(2):200-204.
[6]鹿守敏,宋宏伟,汤国成,等.潘三V类较软围岩巷道、交岔点锚喷网支护试验研究[J].中国矿业大学学报,1996,25(2):99-104.LU Shou-min,SONG Hong-wei,TANG Guo-cheng,et al.Field study on supporting roadways and crossing intype V weaker rocks with bolted shotcreteand wire meshat Pansan colliery[J].Journal of China University ofMining&Technology,1996,25(2):99-104.
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[8]Itasca Consulting Group Inc.Theory and background[M].Minnesota:Itasca Consulting Group,2002.
[9]采矿设计手册编辑委员会.采矿设计手册:井巷工程卷[M].北京:中国建筑工业出版社,1989.
[10]杨果林,刘泽,加筋土挡墙稳定性分析的点安全系数法[J].中南大学学报:自然科学版,2012,43(5):1908-1913.YANG Guo-lin,LIU Ze.Point safety method for stabilityanalysis of reinforced earth retaining wall[J].Journal ofCentral South University:Natural Science Edition,2012,43(5):1908-1913.
[11]蒋青青.基于Hoek-Brown准则点安全系数的边坡稳定性分析[J].中南大学学报:自然科学版,2009,40(3):786-790.JIANG Qing-qing.Stability of point safety factor of slopebased on Hoek-Brown criterion[J].Journal of CentralSouth University:Natural Science Edition,2009,40(3):786-790.
[12]王如宾,徐卫亚,石崇.高地震烈度区岩体地下洞室动力响应分析[J].岩石力学与工程学报,2009,28(3):568-575.WANG Ru-bin,XU Wei-ya,SHI Chong.Dynamicresponse analysis of rock underground caverns in highlyseismic region[J].Chinese Journal of Rock Mechanicsand Engineering,2009,28(3):568-575.
[13]朱建明,徐金海,张宏涛.巷道围岩大变形机理及控制技术研究[M].北京:科学出版社,2010.
[14]高树棠.巷道交接处支架的计算与选择[M].北京:煤炭工业出版社,1982.
[2]李龙福,金爱兵,邓富根,等.软岩交叉巷道开挖围岩稳定性数值模拟分析[J].中国矿业,2011,20(9):84-91.LI Long-fu,JIN Ai-bing,DENG Fu-gen,et al.Numericalsimulation of surrounding rock stability in cross roadwayextraction of soft rock[J].China Mining magazine,2011,20(9):84-91.
[3]陈士海,魏海霞,吕国仁,等.深部巷道交叉段跨采超前加固技术[C]//第十一次全国岩石力学与工程学术大会论文集,2010:352-356.
[4]王成,张农,李桂臣,等.巷道交岔点的数值模拟分析与支护[J].采矿与安全工程学报,2008,25(4):384-388.WANG Cheng,ZHANG Nong,LI Gui-chen,et al.Numerical simulation and support of roadway intersec-tion[J].Journal of Mining&Safety Engineering,2008,25(4):384-388.
[5]柴华彬,张彦宾,程立朝,等.深部巷道交岔点围岩变形及稳定性研究[J].采矿与安全工程学报,2010,27(2):200-204.CHAI Hua-bin,ZHANG Yan-bin,CHENG Li-chao,et al.Research on deformation and stability of wall rocksin intersection of laneway in deep mine[J].Journal ofMining&Safety Engineering,2010,27(2):200-204.
[6]鹿守敏,宋宏伟,汤国成,等.潘三V类较软围岩巷道、交岔点锚喷网支护试验研究[J].中国矿业大学学报,1996,25(2):99-104.LU Shou-min,SONG Hong-wei,TANG Guo-cheng,et al.Field study on supporting roadways and crossing intype V weaker rocks with bolted shotcreteand wire meshat Pansan colliery[J].Journal of China University ofMining&Technology,1996,25(2):99-104.
[7]郭保华,陆庭侃,田采霞.巷道交岔点稳定性影响因素的数值分析[J].采矿与安全工程学报,2008,25(2):192-201.GUO Bao-hua,LU Ting-kan,TIAN Cai-xia.Numericalsimulation of inflluencing factors on stability of flatroadway intersection[J].Journal of Mining&SafetyEngineering,2008,25(2):192-201.
[8]Itasca Consulting Group Inc.Theory and background[M].Minnesota:Itasca Consulting Group,2002.
[9]采矿设计手册编辑委员会.采矿设计手册:井巷工程卷[M].北京:中国建筑工业出版社,1989.
[10]杨果林,刘泽,加筋土挡墙稳定性分析的点安全系数法[J].中南大学学报:自然科学版,2012,43(5):1908-1913.YANG Guo-lin,LIU Ze.Point safety method for stabilityanalysis of reinforced earth retaining wall[J].Journal ofCentral South University:Natural Science Edition,2012,43(5):1908-1913.
[11]蒋青青.基于Hoek-Brown准则点安全系数的边坡稳定性分析[J].中南大学学报:自然科学版,2009,40(3):786-790.JIANG Qing-qing.Stability of point safety factor of slopebased on Hoek-Brown criterion[J].Journal of CentralSouth University:Natural Science Edition,2009,40(3):786-790.
[12]王如宾,徐卫亚,石崇.高地震烈度区岩体地下洞室动力响应分析[J].岩石力学与工程学报,2009,28(3):568-575.WANG Ru-bin,XU Wei-ya,SHI Chong.Dynamicresponse analysis of rock underground caverns in highlyseismic region[J].Chinese Journal of Rock Mechanicsand Engineering,2009,28(3):568-575.
[13]朱建明,徐金海,张宏涛.巷道围岩大变形机理及控制技术研究[M].北京:科学出版社,2010.
[14]高树棠.巷道交接处支架的计算与选择[M].北京:煤炭工业出版社,1982.
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