岩体结构与地面瓦斯抽采井稳定性的关系  

Relationship Between Rock Mass Structure and Stability of Surface Well for Released Coal Gas

作　　者：徐宏杰[1] 桑树勋[1] 韩家章[2] 黄华州[1] 程志忠[2] 任波[1] 

机构地区：[1]中国矿业大学煤层气资源与成藏过程教育部重点实验室,资源与地球科学学院,江苏徐州221008 [2]淮南矿业集团有限责任公司,安徽淮南232001

出　　处：《采矿与安全工程学报》2011年第1期90-95,共6页Journal of Mining & Safety Engineering

基　　金：国家高技术研究发展计划(863)项目(2007AA06Z220);教育部科学技术研究重大项目(307014)

摘　　要：以卸压瓦斯地面井抽采工程实践取得的大量资料为基础,结合物探测井和透孔成果,研究了保护层开采后抽采井套管的变形和破坏按其原因可划分为二种类型:松散层内岩层内部横向塑性变形引起的破坏;基岩段岩体界面滑移引起的变形与破坏.黏土层由于具有厚度大、低强度和高压缩性的特点而易在其内部发生塑性变形;基岩段岩层受采动影响较大,首先在力学弱面-岩性交界面处发生横向剪切,破坏套管.最后以岩体结构为依据,针对高危区段,提出了治理套管变形错断可行的预防措施.Based on data from protective seam mining and engineering practices of surface well for released gas drainage,combined with the through-hole and logging,we didvide the deformation and failure of well casing into two types： 1） the casing failure caused by plastic deformation inside the rock mass in looser layer,and 2） the deformation or the failure caused by slippage of the rock mass along the weak structural surface in bed rock.The results show that the clay layer generally deforms plastically for its great thickness,low intensity and high compression.The horizontal shear occurs firstly in the mechanical weak surface such as lithological interface in bedrock formation,and then the casing is broken.Finally,we proposed some possible preventive measures for the casing failure in high-risk section supported by the rock mass structure.

关 键 词：岩体结构 黏土层 岩性交界面 滑移 挤压 剪切 预防措施 

分 类 号：TD712[矿业工程—矿井通风与安全]