The Characteristics of Grout Diffusion in Reduce Subsidence Mining with Abscission Layer Grouting

• Published in: Geotechnical and geological engineering 2023, Vol.41 (1), p.553-575
• Main Authors: Fan, Zhenli, Cao, Lutong, Yu, Qiuge, Zhao, Qiuyang, Zhang, Zhiwei
• Format: Article
• Language: English
• Subjects: Abscission; Civil Engineering; Coal; Coal mining; Deformation; Diffusion; Diffusion layers; Dilution; Earth and Environmental Science; Earth Sciences; Engineering; Fracture zones; Geotechnical Engineering & Applied Earth Sciences; Groundwater; Groundwater flow; Groundwater mining; Groundwater quality; Grout; Grouting; Hydrogeology; Jet Grouting and Soil Deep Mixing; Mathematical models; Mining; Novel Technologies for Grouting; Numerical prediction; Original Paper; Storage; Subsidence; Terrestrial Pollution; Towns; Tracers; Waste Management/Waste Technology; Water purification; Water quality; Work face
• ISSN: 0960-3182; 1573-1529
• DOI: 10.1007/s10706-022-02240-4

The roof abscission layer formed by coal mining changes dynamically with the mining of working face. The grouting of abscission layer is an important engineering method to reduce ground subsidence and protect ground buildings. By using empirical formula prediction, numerical simulation and tracer test, the dynamic development characteristics of abscission layer, storage space of grouting grout, diffusion law of grout and its influence on groundwater were studied. The results show that the separation space mainly exists in the top of water-conducting fracture zone, which develops and closes with the mining of working face. The grout is mainly stored in the horizontal abscission layer. Grouting grout diffuses with mining-induced fissures and groundwater flow. Under the dilution and purification of stratum and groundwater, the influence of grouting on groundwater quality is basically eliminated after 20 years.