Cause Analysis and Prevention of Hole Collapse by Water Injection and Dust Removal in Qi Panjing Coal Mine

Hua Guo,Zhi-Rong Wu,Shi-Qiang Chen,Hai-Qiao Wang,Bin-Wei Xia

doi:10.1155/2020/8814015

Hua Guo, Zhi-Rong Wu + Show 3 more

Open Access

https://doi.org/10.1155/2020/8814015

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Abstract

To solve the “special coal seam” with complex coal seam structure, fault phenomenon, and many gangue layers and complex gangue lithology in Qi Panjing coal mine, the problems such as hole collapse and blockage of coal seam water injection dust removal drilling are caused. From the aspects of drilling layout, drilling technology, and gangue material consolidation, a complete set of key technologies for prevention and control of water injection and dust removal in “special coal seam,” have been formed. Seven boreholes have been drilled in I020902 return air roadway of Qi Panjing coal mine, and field comparative test has been carried out. The results show that: after adopting the complete set of key technologies of drilling prevention and control, the drilling depth is 85-100 m, the average depth is 98 m, and the drilling depth of coal seam water injection can reach 170-185 m; the footage per cycle is greatly improved, with the minimum increase of 30.86%, the maximum increase of 46.38%, and the average increase of 36.77%, to save drilling time and bring good economic benefits, and there is no collapse in the borehole hole, to ensure the safety of production. It has a good reference, and practical guiding significance for other coal mining faces, especially for “special coal seam” working face.

Highlights

A lot of dust is produced in the process of mine production, which affects the health of workers, accelerates the wear of machines, pollutes the working environment, and increases the probability of accidents [1]
Given the problem of hole collapse in water injection drilling of “special coal seam” in the Qi Panjing coal mine, the author first analyses the occurrence conditions of coal seam and the causes of hole collapse and puts forward a complete set of process method of drilling layout, drilling technology combined with gangue material consolidation, forming a systematic water injection dust removal drilling hole collapse prevention technology, which has been applied to engineering practice with remarkable effect
Form a small area of drilling, and through the middle and bottom of the long cone drill bit to expand the hole diameter required for coal seam water injection

Summary

Introduction

A lot of dust is produced in the process of mine production, which affects the health of workers, accelerates the wear of machines, pollutes the working environment, and increases the probability of accidents [1]. In all kinds of methods of wet dust removal, coal seam water injection dust removal effect is remarkable, high efficiency, and is a method to prevent and control dust from the root. Given the problem of hole collapse in water injection drilling of “special coal seam” in the Qi Panjing coal mine, the author first analyses the occurrence conditions of coal seam and the causes of hole collapse and puts forward a complete set of process method of drilling layout, drilling technology combined with gangue material consolidation, forming a systematic water injection dust removal drilling hole collapse prevention technology, which has been applied to engineering practice with remarkable effect

Cause Analysis of Hole Collapse in Water Injection Dust Removal Drilling

Technical Measures for Hole Collapse Prevention

Results and Discussion

Conclusion