Roof Hydraulic Fracturing for Preventing Floor Water Inrush under Multi Aquifers and Mining Disturbance: A Case Study

Pengpeng Wang, Yaodong Jiang and Qingshan Ren
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Pengpeng Wang: School of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
Yaodong Jiang: School of Mechanics and Civil Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
Qingshan Ren: School of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China

Energies, 2022, vol. 15, issue 3, 1-22

Abstract: Water inrush disasters from the coal seam floor occur frequently due to the high water pressure of the Ordovician limestone aquifer, multiple aquifers and strong mining disturbance. We presented a model of water-resisting key strata (WRKS) to investigate the mechanism of floor water inrush from multiple aquifers in deep coal mines. Roof hydraulic fracturing (RHF) for controlling floor water inrush and multi-parameter monitoring were proposed and validated in the Xingdong coal mine in Xingtai, Hebei Province. The results indicated that the periodic weighting step of the test working face after RHF was 9.53 m, which was 61.42% less than that of the working face without RHF (24.7 m). The floor failure depth was 30 m, which was 34.4% less than that of the zones without RHF (45.7 m). Hydraulic fracturing weakened the strength of the overlying strata to control the weighting step and reduce the mining disturbance stress, and the stability of the floor WRKS was enhanced, thereby preventing water inrush from the coal seam floor. The research results provide a solution for preventing floor damage and floor water inrush under strong mining disturbance and in complex hydrogeological environments in deep mining.

Keywords: deep mining; high water pressure; mining disturbance; water inrush prevention; Xingdong coal mine (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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