Preparation of a New Borehole Sealing Material of Coal Seam Water Infusion

Abstract

To improve the borehole sealing effect of coal seam water infusion, especially that of coal seam with low permeability and high rigidity, this study investigated the performance test optimization of two cement-based sealing materials. e borehole sealing effect of this coal seam requires high-pressure water infusion. Result shows that when the water-cement ratio is 0.4 and the amount of fiber expansive agent is 10%, the new borehole sealing material displays microexpansion. In addition, the 1-day compressive strength reaches 16 MPa. is result satisfies the material compressive strength requirement under 30 MPa high-pressure water infusion. e sealing performance is also excellent. According to the scanning electron microscopy analysis of new borehole and traditional borehole sealing materials, the surface of new borehole sealing material shows no holes and possesses compactness. e sealing effect is superior to that of other traditional sealing materials. is effect can satisfy the sealing requirement of coal seam water infusion. e new borehole sealing material is considerably significant for the improvement of the water infusion effect.

30-Year Trends in the Disease Burden, Incidence, and Prevention of Pneumoconiosis

“…Dust control engineering technologies and strategies are crucial methods for decreasing dust concentrations in workplaces. The predominant example of reducing dust concentrations through optimized process operations is utilizing wet operations to diminish the production and transmission of industrial dust (23). For instance, in the field of coal mining, water injection into coal seams is employed to regulate dust emission during mining (24).…”

“…The predominant example of reducing dust concentrations through optimized process operations is utilizing wet operations to diminish the production and transmission of industrial dust ( 23 ). For instance, in the field of coal mining, water injection into coal seams is employed to regulate dust emission during mining ( 24 ). The addition of a surfactant enhances the water’s wettability to coal, which proves beneficial in reducing coal dust production during the water injection process ( 25 - 26 ).…”

Experimental Study on the Influence of Coal Fracture Surface Roughness on Water Injection Seepage

“… 1 − 4 Since coal seam water injection is an effective means to prevent outburst and suppress coal dust, it is widely used in coal fields. 5 , 6 In addition, coal seam water injection can increase the water content of the coal mass, change the nature of the coal mass, and reduce the dust concentration during the mining process, thereby reducing the hazards of dust to personnel health and engineering equipment. 7 However, the mechanism of the coal seam water injection process is complicated, and the actual parameter setting often depends on experiences.…”

“…With the gradual depletion of shallow coal resources, deep coal mining has become an important development trend in the future. However, in the process of deep mining, there are many engineering disaster prevention and control problems such as rock bursts, floor water inrush, gas outbursts, and coal dust explosions. − Since coal seam water injection is an effective means to prevent outburst and suppress coal dust, it is widely used in coal fields. , In addition, coal seam water injection can increase the water content of the coal mass, change the nature of the coal mass, and reduce the dust concentration during the mining process, thereby reducing the hazards of dust to personnel health and engineering equipment . However, the mechanism of the coal seam water injection process is complicated, and the actual parameter setting often depends on experiences.…”