深井大断面软岩巷道底鼓破坏特征及治理技术研究
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摘要
为解决深井大断面软岩巷道底板问题,以察哈素煤矿11302工作面回风巷为研究对象,通过现场实际监测分析了巷道底鼓破坏规律,结果表明:巷道底部岩层存在零位移点及零应变点,并将巷道底部表面向下依次分为拉应变上升区、拉应变下降区及压应变下降区,零应力点及零位移点距巷道底板表面距离分别为1. 32m和1. 68m。分析了围岩强度、围岩应力、支护形式对巷道底鼓的影响,在此基础上提出了改变区段煤柱尺寸、优化巷道支护参数及局部注浆的底鼓控制技术。最后通过工程实践表明,采取相应技术措施后巷道底鼓得到了有效控制,具有良好的技术经济效益。
In order to solve the problem of floor heave in soft rock roadway with large section in deep mine,taking the 11302 working face air return of Chahasu Coal Mine as the research object,firstly,the failure law of roadway floor heave was analyzed through field tests: there were zero displacement point and zero strain point at the bottom of roadway,the strata at the bottom of the roadway were divided into tensile strain rise zone,tensile strain drop zone and compressive strain drop zone from the surface downward,the distance between zero stress point and zero displacement point from the floor of the roadway was 1.32 M and 1. 68 m respectively. Secondly,the influence of surrounding rock strength,surrounding rock stress and support form on floor heave of the roadway is analyzed,and on the basis of the above,the control technology of changing floor coal pillar size,optimizing roadway support parameters and local grouting is proposed. Finally,the engineering practice shows that the floor heave of roadway has been effectively controlled by adopting corresponding technical measures,and has good technical and economic benefits.
In order to solve the problem of floor heave in soft rock roadway with large section in deep mine,taking the 11302 working face air return of Chahasu Coal Mine as the research object,firstly,the failure law of roadway floor heave was analyzed through field tests: there were zero displacement point and zero strain point at the bottom of roadway,the strata at the bottom of the roadway were divided into tensile strain rise zone,tensile strain drop zone and compressive strain drop zone from the surface downward,the distance between zero stress point and zero displacement point from the floor of the roadway was 1.32 M and 1. 68 m respectively. Secondly,the influence of surrounding rock strength,surrounding rock stress and support form on floor heave of the roadway is analyzed,and on the basis of the above,the control technology of changing floor coal pillar size,optimizing roadway support parameters and local grouting is proposed. Finally,the engineering practice shows that the floor heave of roadway has been effectively controlled by adopting corresponding technical measures,and has good technical and economic benefits.
引文
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[2]康红普,吴拥政,李建波.锚杆支护组合构件的力学性能与支护效果分析[J].煤炭学报,2010,35(7):1057-1065.
[3]杨双锁.回采巷道围岩控制原理及锚固结构的适应性研究[D].徐州:中国矿业大学,2001.
[4]王卫军,冯涛.加固两帮控制深井巷道底鼓的机理研究[J].岩石力学与工程学报,2005,24(5):808-811.
[5]伊西锋.沿空掘巷底鼓机理与控制技术[D].徐州:中国矿业大学矿业,2009.
[6]王卫军,侯朝炯,冯涛.动压巷道底鼓[M].北京:煤炭工业出版社,2003.
[7]康红普,范明建,高富强,等.超千米深井巷道围岩变形特征与支护技术[J].岩石力学与工程学报,2015,34(11):2227-2241.
[8]王琦,樊运平,李刚,等.厚煤层综放双巷工作面巷间煤柱尺寸研究[J].岩土力学,2017,38(10):3009-3016.
[9]苏海健,靖洪文,张春宇,等.软化与膨胀作用下深部巷道围岩黏弹塑性分析[J].采矿与安全工程学报,2012,29(2):185-190.
[10]周明,公建祥,颜磊.深井软岩巷道高强锚杆支护技术[J].中国矿山工程,2008,37(4):31-33.