地面瓦斯抽采钻孔变形破坏影响因素及防治措施分析

采动影响下,采场上覆岩层发生剧烈滑移和离层,往往造成地面瓦斯抽采钻孔的变形破坏。地面钻孔套管的变形不仅与采场覆岩的岩性、厚度等地质、力学性质有关,还与采场尺寸、顶板控制方法、回采速度等回采工艺有关。对这些影响因素进行了系统分析,并提出了地面钻孔套管变形破坏的防治措施。

Analysis on Deformation and Fracturing Factors of Surface Gas Drainage Holes and Preventive Measures

The rock strata over the stope will have a great movement and bed separation during the extraction of coal seam,and this often leads to the damage and deformation of the surface gas drainage boreholes. The deformation of the surface gas boring casing is not only related to the geological and mechanical properties such as the lithologic characters and thickness of the overburden rock of the stope,but also to the stope dimensions,roof control method,extraction velocity and so on. This paper gave a symmetric analysis on these factors and put forward the preventive measures against the deformation of surface gas boring casing.