Research on IDS Water Injection for Prevention of Dynamic Disasters in High-Stress Low-Adsorption Coal Seams

Abstract

The deep coal seams in the Pingdingshan mining area are characterized by high stress and low adsorption capacity. Existing water injection additives have proven ineffective in preventing dynamic disasters. Research has found that IDS (iminodisuccinic acid tetrasodium salt) can dissolve minerals in coal, significantly improving the connectivity of coal pores and effectively enhancing coal seam wettability and permeability. Physical and mechanical property tests were conducted on coal samples before and after IDS solution immersion to determine the optimal water injection solution concentration, and industrial-scale experiments were carried out on-site. The results show that after IDS interaction with coal, the physical and mechanical properties of coal samples changed significantly, resulting in a significant reduction in impact proneness. At a concentration of 1000 μg/mL, the elastic energy index, impact energy index, uniaxial compressive strength, and time to dynamic failure of coal samples decreased by approximately 75%, 20%, 25%, and 50%, respectively. Industrial trials were conducted in the Ji_16–17-22240 working face of Pingmei No. 11 Mine. The addition of IDS in water injection increased the coal seam moisture content by 2–3 percentage points, achieving a wetting radius of over 1.5 m, significantly enhancing the disaster prevention effect of water injection. This study provides a new approach and technical support for the prevention of dynamic disasters in deep high-stress low-adsorption coal seams, which is of great significance for ensuring coal mine safety.