Study of sealing technology of downward permeable borehole

摘要

In gas prediction and prevention, it is important for the Mine-managers to know coal-seam gas-pressure. Because of the limitation of geological conditions, some seam can not use upward bore to measure gas pressure, so using downward bore is essential, but coal-seam gas-pressure measure is difficult on the this condition(QixiangYu. 1992). In order to resolve this problem, the way of "subsection and time-sharing hole sealing" is propounded in this paper, by using this method, the crevice water of wall rock is blockaded effectively and the influence of measure gas pressure by crevice water is avoided. It can provide guarantee to measure gas pressure under the complicated condition. By the local practice, good effect is achieved.