Research on the permeability resistance of a typical fault based on partitions of structural complexity
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ORIGINAL PAPER
Research on the permeability resistance of a typical fault based on partitions of structural complexity Haitao Yu 1 & Shuyun Zhu 1 & Huadong Xie 2 & Junhua Hou 2 Received: 14 July 2019 / Accepted: 20 May 2020 # Saudi Society for Geosciences 2020
Abstract To explore the risk of water inrush associated with mining with pressure, the fractal dimension method is applied to quantify the partition of structural complexity within the deep fault zone of a newly planned mining area, including complex area, medium area and simple area. The engineering geological model of the Beigong No. 2 fault is established in the complex area, using the Nos. 5 and 7 mining area of the Dongtan Coal Mine as the geological background. Combining measurement of mining failure in this coal mine and analysis of permeability resistance of the fault zone by engineering geological analogy, the concept of a safety coefficient of mining with pressure is put forward, which can be used as a quantitative criterion for evaluating the risk of water inrush from the Ordovician limestone aquifer. The evaluation methods and results of this research have important reference value for the evaluation of water damage in other mining areas with similar geological conditions. Keywords Water inrush . Structural complexity partition . Fault zone . Permeability resistance . Mining failure . Engineering geological analogy
Introduction With the increasing development of coal exploitation, the threat of damage from confined water is becoming increasingly more serious in mining areas (Dash et al. 2016). With the progress of technology, water inrush accidents in recent years in China have shown a downward trend (Fig. 1). The safety limit of mining with pressure depends largely on the contrastive relationship between the water-blocking capacity and hydrodynamic conditions of the mining floor. The sealing capacity of the mining floor is closely related to the combination of strata, the degree of deformation of the floor and the complexity of structures (Shi and Han 2005). Most water inrush
Responsible Editor: Francois Roure * Shuyun Zhu [email protected] 1
Institute of Mine Water Hazards Prevention and Controlling Technology, School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
2
Department of geological survey, Dongtan Coal Mine, Yanzhou Coal Mining Company, Zoucheng 273500, Shandong, China
accidents occur in the fault structure because the permeability resistance of fault fracture zone is much lower than that of the intact strata. Under water pressure, the bottom water may rush into the working face along the fractured zone and lead to water inrush (Wei et al. 2010; Hu et al. 2014; Ji et al. 2016; Li et al. 2018). Therefore, statistical fault characteristics are of great importance in the prevention and control of mine water damage and allowance for safe excavation into the roadway (Li et al. 2017). Yang et al. (2018) combined GIS with fractal theory to evaluate the structural complexity of th
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