首页> 中文期刊> 《中南大学学报(自然科学版)》 >软弱破碎围岩运输巷道变形机理及修复支护

软弱破碎围岩运输巷道变形机理及修复支护

         

摘要

为解决井下软弱破碎围岩巷道的支护问题,以巴鲁巴铜矿580 m水平运输巷道为研究对象,对巷道稳定性进行监测,分析巷道的变形特征及其影响因素,认为应力集中、围岩软弱破碎、支护强度低以及水的影响是巷道变形的主要影响因素.对巷道变形机理进行研究,建立巷道力学模型,在此基础上结合现场实际提出“钢拱架+长锚索”联合支护方案.使用FLAC3D对修复前后巷道稳定性进行模拟分析.研究结果表明:修复后巷道应力集中区域远离巷道表面,巷道围岩塑性区域面积下降40%.对巷道进行修复并对其稳定性进行监测,60 d内巷道两帮最大收敛变形量为39mm、顶板最大下沉量为50 mm,没有明显的底鼓发生,巷道变形得到有效控制.%To solve the support problem of soft-fractured surrounding rock underground,taking the haulage roadway of Baluba copper mine at 580 m level as study object.The stability of roadway was monitored,and the deformation characteristics of roadway and influencing factors were analyzed.The main influencing factors are stress concentration,weak and fractured surrounding rock,low supporting intensity and water.After analyzing the deformation mechanism of roadway,the mechanical model of roadway was established,based on the mechanical model and actual situation,the combined support design with "steel arch and long prestressed cable bolt" was put forward,and then the FLAC3D was used to analyze the stability of roadway before and after support.The results show that region of stress concentration is away from the roadway surface and the area of plastic zone of surrounding rock declined by 40%.The stability of roadway was monitored after repairing and the results indicated that the roadway deformation has been effectively controlled,with maximum subsidence 50 mm of the roof,maximum convergence deformation 39 mm of two side walls and no heaving floor in 60 d.

著录项

相似文献

  • 中文文献
  • 外文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号