Prevention method for pressure bump of approximately-vertical super-thick coal seams

Abstract

The invention discloses a prevention method for pressure bump of approximately-vertical super-thick coal seams. The prevention method comprises the following steps that S1, before a horizontal coal seam in each stage is exploited, rock pillars, a coal seam roof and a coal seam floor on the corresponding exploitation level are subjected to water injection and softening; S2, the rock pillars, the coal seam roof and the coal seam floor on the corresponding exploitation level are subjected to pre-cracking and bursting; and S3, the horizontal coal seam in the corresponding stage is subjected to water injection, softening, pressure relief and bursting. The rock pillars, the coal seam roof and the coal seam floor are all rock mass. By the adoption of the prevention method for pressure bump of the approximately-vertical super-thick coal seams, regional structure horizontal stress can be prevented from being transferred to the coal rock mass, the energy accumulation degree of the coal rock mass is reduced, the risk of pressure bump of the approximately-vertical super-thick coal seams is effectively lowered, and technical support and safety insurance are provided for safe and efficient production of mines under the similar conditions.

Description

technical field [0001] The invention relates to the technical field of coal mining, in particular to a method for preventing and controlling rock burst in a nearly vertical extra-thick coal seam. Background technique [0002] Rock burst usually occurs during coal mining. It is a phenomenon in which the potential energy generated by the elastic deformation accumulated in the rock mass is suddenly and violently released, causing the rock to break, burst and eject. With the continuous increase of coal mining depth and the continuous expansion of the mining area, the threat and harm brought by rock burst to the mine are also becoming more and more serious. Rock burst has become an urgent coal mine safety production problem to be solved worldwide. For the prevention and control of rock burst in gently inclined coal seams, my country and other major coal mining countries have formed a variety of theories and methods, and achieved good application results in many mines, while the ...

AI Technical Summary

Problems solved by technology

Affected by regional tectonic horizontal stress, some coal seams in Northwest China are in a near-vertical state, and they are obviously squeezed, and high energy is accumulated in the coal and rock body. Judging from the geological dynamic environment, the near-vertical extra-thick coal seams often have shock ground Under the dynamic conditions of rock burst, the risk of rock burst is greater

Images