[1]Jia Yuliang,Chen Sushe,Deng Qiang,et al.Effects of subsidence fissures on soil physicochemical properties under multi-coal seam repeated mining[J].Research of Soil and Water Conservation,2025,32(03):98-107.[doi:10.13869/j.cnki.rswc.2025.03.037]
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Effects of subsidence fissures on soil physicochemical properties under multi-coal seam repeated mining
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
32
Number of periods:
2025 03
Page number:
98-107
Column:
Public date:
2025-06-20
- Title:
- Effects of subsidence fissures on soil physicochemical properties under multi-coal seam repeated mining
- Keywords:
- subsidence fissures; soil physicochemical properties; multi-coal seam; repeated mining; ecologically fragile mining area
- CLC:
- S153
- DOI:
- 10.13869/j.cnki.rswc.2025.03.037
- Abstract:
- [Objective] The aims of this study are to investigate the impact of ground fissures on soil physical and chemical properties under multi-coal seam repeated mining in the ecological fragile area, and to provide scientific support for land reclamation and ecological restoration. [Methods] Subsidence fissure zones caused by primary, secondary and tertiary mining were selected as the research objects in Huojitu mine of Shendong mining area. Through soil sampling and testing, soil physicochemical properties were analyzed, and their responses to mining frequency were revealed. [Results] (1) The soil layer, repeated mining and their interactions significantly affected the soil bulk density, moisture content, total porosity, capillary porosity, maximum water holding capacity, and capillary water holding capacity in the fissured area. The soil porosity decreased, bulk density increased, and soil water holding capacity decreased in primary and secondary mining-induced fissure zones. Soil porosity and water holding capacity increased in the tertiary mining-induced fissure zone, and soil water content was significantly higher than that in the same soil layer in the undisturbed zone (p<0.05), with a maximum value of 15.01% (50—70 cm soil layer). (2) Repeated mining significantly affected the contents of soil total nitrogen, alkaline nitrogen, total phosphorus and organic matter in fissure areas (p<0.05). Soil total nitrogen and total phosphorus contents in primary and secondary mining-induced fissure zones were significantly lower than those in the undisturbed zone (p<0.05). There was no significant difference in the contents of total nitrogen, alkaline nitrogen, and total phosphorus between the tertiary mining-induced fissure zone and the undisturbed zone (p>0.05). The contents of available phosphorus and organic matter in the 0—10 cm soil layer were 9.97 mg/kg and 13.18 g/kg, respectively, which were significantly higher than those in other areas (p<0.05). (3) Repeated mining significantly enhanced the negative correlation between different soil physical properties, soil nutrient content and soil water content in fissure zones (p<0.05). [Conclusion] It can be seen that the spatial heterogeneity of soil physical and chemical properties is enhanced by multi-coal seam repeated mining in fissure zones, but the exact direction and degree of variations has no correlation with mining frequency.
- References:
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Last Update:
2025-06-20