瓦斯抽采钻孔稳定性动态监测装置研发及应用

Development and application of stability dynamic monitoring and measuring device to gas drainage borehole

为实时动态监测瓦斯抽采钻孔深部稳定性,自主研发了瓦斯抽采钻孔稳定性动态监测装置,其主要由主体承载机构、高灵敏度应力应变片、快速连接杆和精密应力应变测量仪组成。该装置可采集不同角度地应力值,采集钻孔变形数据,不同材质的主体承载机构可实现钻孔稳定性加固的效果。现场实测结果表明:钻孔形变曲线可大致分为快速形变阶段、缓慢形变阶段、基本稳定阶段3个阶段;快速形变阶段与缓慢形变阶段间,缓慢形变阶段与基本稳定阶段间,均存在较明显拐点;对于不同直径钻孔中的相同深度,形变量随着直径增大而增大;对于相同直径钻孔中不同深度,浅处形变大于深处形变;瓦斯抽采钻孔形变在一定程度上影响了瓦斯抽采工作的进行。该装置具有较好的实用性和可靠性,为实时动态监测瓦斯抽采钻孔稳定性提供了一种新的手段。

In order to real timely and dynamically monitor and measure the stability of the deep gas drainage borehole,a stability dynamic monitoring and measuring device of the gas drainage borehole was independently researched and developed and the device was mainly composed with a host loading structure,high sensitive stress and strain gauges,rapid connected rod and precision stress and strain gauges.The device could collect different angle geostress and collect the deformation data of the borehole. The host loading mechanism with different material quality could realize the stability reinforced effect of the borehole. The site measured result s showed that the deformation curve of the borehole could roughly be divided to three stages,including the rapid deformation stage,slow deformation stage and basic stable stage. A obvious inflexion individually existed between the rapid deformation stage and the slow deformation stage and between the slow deformation stage and the basic stable stage. In the different diameter boreholes,the same depth and deformation amount would be increased with the diameter increased. In the same diameter boreholes,the different depth and deformation in the shallow depth would be higher than the deformation at the deep depth. The deformation of the gas drainage borehole would be affected to the gas drainage operation conducted in a certain degree. The device with a good practicability and reliability could provide a new means to real timely and dynamically monitor and measure the stability of the gas drainage borehole.