Substantiation of the stability of haulage drifts with protective structures of different rigidity

• Main Authors: Igor Iordanov, Yuliia Simonova, Oleksiy Kayun, Yevgen Podkopayev, Anton Polozhii, Hennadii Boichenko
• Format: Article
• Language: English
• Published: PC Technology Center 2020-06-01
• Series: Eastern-European Journal of Enterprise Technologies
• Subjects: mining pressure; breakage face; side rock collapse; the filling of worked space; pliable supports
• Online Access: http://journals.uran.ua/eejet/article/view/202483

The purpose of the current research is to substantiate the conditions for the stability of haulage drifts when developing steep coal seams. The process of modeling the stability of haulage drifts has established that the stressed-strained state of side rocks in a coal-producing array that includes workings depends on the physical and mechanical properties of the roof and soil of the worked coal seam, the rigidity of protective structures, and the length of the roof section supported by a protective structure. Increasing the length of the roof section supported by a protective structure, at the minimal rigidity of pliable supports, increases the zone of smooth bending of the side rocks over a haulage drift and decreases the level of their stressed-strained state. It has been proven that when maintaining mining workings in deep mines, a reduction in the stressed-strained state of the side rocks, when applying the filling of the worked space, occurs as a result of the sealing of the filling massif on which the roof rocks are based when the values of the compaction factor of the source material accept maximum values equal to kcomp=1.5–1.53. When using artificial pliable protective structures, erected above a drift, a change in the stressed-strained state occurs as a result of compression of the supports, when the movement of rocks of the roof and soil is limited and the area of contact between side rocks and the erected protective structures increases. When choosing a protection technique for haulage drifts, it is necessary to take into consideration the parameters of the protective structures, because the impact of the size of the same supports, at the same rigidity, on the distribution of stresses in a coal-rock massif is diverse. In order to ensure the operational condition of the district preparatory workings in the development of steep coal seams, it is advisable to use pliable protective structures located above a haulage drift, which limit the movement of side rocks in the worked space