北徐楼煤矿超大口径投料孔施工技术

Construction technology of super-large diameter feed hole in Beixulou coal mine

摘要:

煤矿企业开采过程中地面倾倒大量煤矸石，通过从地面煤矸石仓附近施工一口到达井下巷道的超大口径钻孔，将生产的煤矸石固体废弃物输送至井下采空区，不仅可以解决地面倾倒煤矸石对环境的污染，同时可以有效控制地表移动变形，实现煤矿的绿色可持续发展。在山东滕北矿区北徐楼煤矿超大口径投料孔的施工实践中，采用预先施工小孔径先导孔，一开5级扩孔，二开4级扩孔，配合使用泥浆正循环、牙轮钻头气举反循环等工艺进行钻进，钻成一口煤矿超大口径投料孔，探索出对于超大口径投料孔钻孔的施工技术，其成熟的施工方案对于超大口径钻孔工程具有一定的指导意义。

Abstract:

During the mining process， coal mining enterprises dump a large amount of coal gangue on the ground. Through the construction of a super-large bore hole near the ground coal gangue bin to the underground roadway， the solid waste of coal gangue produced can be transported to the underground gob， which can not only solve the environmental pollution of coal gangue on the ground， but also effectively control the movement and deformation of the surface， so as to realize the green and sustainable development of coal mines. In the construction practice of large diameter feeding hole in Beixulou coal mine， Tengbei mining area， Shandong Province， small diameter pilot hole is pre-constructed， 5-stage re-expanding hole is opened in one stage， and 4-stage re-expanding hole is opened in the second stage， and a large diameter feeding hole is drilled in a coal mine with positive circulation of mud and air lift reverse circulation of cone bit. Its mature construction scheme has certain guiding significance for the large diameter drilling project.