TY - JOUR
TI - Experimental study on lateral compression characteristics of fly ash slurry filled with separate layer
AU - Yao Wen-Tao
AU - Ma Zhan-Guo
AU - Cai Chuan-Chuan
AU - Hao Yan-Kui
AU - Liu Wang
AU - Yue Peng
JN - Thermal Science
PY - 2025
VL - 29
IS - 2
SP - 1509
EP - 1514
PT - Article
AB - The spatiotemporal evolution of multiple key layers overlying strata in thick  coal seam has always been one of the key and difficult problems to be solved  in the field of stratified filling, and the confined compression  characteristics of fly ash slurry are the main influencing factors. In this  paper, the lateral compression and viscosity test of filling materials were  carried out, and the shear stress and plastic viscosity of filling  materials were studied. The results show that the strain of fly ash in the  initial stage of compaction accounts for 64.8% of the final strain. When the  fly ash slurry is pressed, the stress increases exponentially with the  strain, and the volume weight has a logarithmic relationship with the  compaction stress. Both shear stress and plastic viscosity decrease  negatively with the increase of water-cement ratio. When the ratio of fly  ash to water to cement is controlled between 1.2 and 1.4 and the mass  concentration is controlled between 41.7% and 45.5%, the slurry fluidity,  pumpability and grouting efficiency are high.