Strengthening of coal massif by resinization
Abstract
During the development of thick coal seams of the Prokopyevsk‑Kiselevsky region of Kuzbass, a large number of geological disturbances (20‑60% of the total area of mined seams) are encountered, and the relative development of disturbances increases with increasing depth of mining. When driving workings in such zones, large coal falls occur, which increases the danger of operations, significantly complicates driving and subsequent extraction. Coal in the disturbed zones and at some distance from them has low strength (less than 10 kg/cm²). The zone of weakened rocks and coal of the disjunctive disturbance usually extends for 12‑15 m in each direction. Mine workings in the zones of disturbances have to be repeatedly re‑supported, which leads to inevitable increase in the cost of operations. Strengthening of the coal massif by injection of chemical solutions into it will increase the stability of coal exposures in development workings. In this way it is possible to strengthen thinly fractured rocks with a filtration coefficient less than 1 m/day. Cementation in these cases does not give a positive effect.
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References
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