Investigation of fracture properties and microbially induced calcite precipitation(MICP)restoration in coal mining areas within the diverse Terrain of Northern Shaanxi,China
Ying Gao1
Mohd Ashraf Mohamad Ismail2
Tao Li3
Jingwang Yan4
Qiang Sun5
1.School of Civil Engineering,Universiti Sains Malaysia,Penang 11800,Malaysia;College of Mining and Mechanical Engineering,Liupanshui Normal University,Liupanshui 53000,China2.School of Civil Engineering,Universiti Sains Malaysia,Penang 11800,Malaysia3.College of Mining and Mechanical Engineering,Liupanshui Normal University,Liupanshui 53000,China4.Shaanxi Coal Group Shenmu NingTiaoTa Mining Company Limited,Shenmu 719300,China5.School of Mining Engineering,China University of Mining and Technology,Xuzhou 221000,China
摘要：The complex and diverse nature of coal mining sites,including different landforms and working conditions,presents chal-lenges for rehabilitation efforts.To address this,we conducted a comprehensive experimental study focusing on microbially induced calcium carbonate precipitation(MICP)remediation,considering the fracture characteristics of coal mining sites.The MICP-restored samples were subjected to confined/unconfined compressive strength,uniaxial/triaxial permeability,and souring tests to assess their restoration efficacy.The results showed that under similar mining conditions,the average depth of parallel fractures was 0.185 m for loess ridges,0.16 m for the valley,and 0.146 m for the blown-sand region,while the average depth for boundary fractures was 0.411 m for loess ridges,0.178 m for the valley,and 0.268 m for the blown-sand region.Notably,parallel fractures showed negligible filling in all landforms,whereas boundary fractures in the blown-sand region were completely filled with wind-deposited sand.The valley landform was filled with alluvium and wind-deposited sand,whereas the loess landform was filled with wind-deposited sand and loess.MICP-restored soil samples in all landforms achieved a strength comparable to remolded fracture-free soil samples.Across all landforms,the maximum permeability coefficient of MICP-restored soil samples closely matched that of remolded fracture-free soil samples.Under similar topo-graphic and rainfall conditions MICP restorations scoured 31.3 g on blown-sand region,19.3 g on loess ridges,and 17.6 g on valleys.These research findings provide an experimental foundation for MICP repair of coal mining ground fractures.
机标关键词：northernshaanximicpareaschinacalcitecoaldiverse
论文发表日期：2025-02-28
在线出版日期：2025-10-15（本平台首次上网日期，不代表文献的发表时间）
页数：12( 85-96 )
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