China Safety Science Journal ›› 2025, Vol. 35 ›› Issue (5): 116-123.doi: 10.16265/j.cnki.issn1003-3033.2025.05.0804

• Safety engineering technology • Previous Articles     Next Articles

Research on microstructure mechanical properties of consolidation of high-fluid slurry materials

GUO Xin1,2(), LI Dafang1, LU Yi1,**(), SHI Shiliang1, LI He1, SONG Yi1   

  1. 1 School of Resource, Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan Hunan 411201, China
    2 Joint National-Local Engineering Research Centre for Safe and Precise Coal Mining, Huainan Anhui 232001, China
  • Received:2024-12-11 Revised:2025-02-20 Online:2025-05-28 Published:2025-11-28
  • Contact: LU Yi

Abstract:

In order to explore the effect of high fluid slurry materials on the micromechanical properties of coal, the transition area formed by different slurry materials and coal after grouting was scanned by scanning electron microscopy (SEM). Nanoindentation tests were carried out to analyze the effects of high fluid slurry materials on the microstructural characteristics and micromechanical properties of coal. Structural defects existed in the consolidated surface after grouting of ordinary cement materials. In view of this, the structural modification and mechanical strengthening mechanism of the transition area of the heterogeneous body were analyzed. The results show that the mechanical properties of the transition area between the high flow grouting material and the coal body are the weakest in the heterogeneous structure. This area is easy to break. The indentation modulus and indentation hardness in the transition zone between high flow grouting material and coal increase with the increase of mechanical properties of coal structure surface. After the ordinary cement grouting, the transition zone between the material and the coal body is large. The crystal density is low, there are obvious cracks between the material and the coal body, and the micromechanical properties are weak. After grouting, the high flow grouting material has close microstructure in the transition zone with coal. The transition zone with consolidated surface is small. Meanwhile, the interface transition zone (ITZ) has good micromechanical properties. These characteristics are helpful to improve the ability of gas extraction borehole deformation resistance.

Key words: high flow slurry materials, plane of consolidation, mechanical property, anisoplast, nano-indentation

CLC Number: