TY - JOUR
TI - Law and mechanism of subsidence reduction of grouting in mining goaf area
AU - Wang Yue
AU - Yi Si-Hai
AU - Jing Sheng-Qiang
AU - Lu Ming-Xing
AU - Yi Hai-Yang
AU - Gao Peng-Cheng
AU - Zhong Rui
AU - Chen Wen-Cong
JN - Thermal Science
PY - 2025
VL - 29
IS - 2
SP - 1489
EP - 1495
PT - Article
AB - Similar material simulation experiments on grouting in the goaf, aiming to  investigate the damage characteristics of the overburden and the movement  behavior both before and after grouting were conducted. The results  demonstrate that after grouting the goaf, large fissures, fractures, holes,  and other cavities are effectively sealed by the slurry. Compared to  untreated goaf, grouting significantly reduces subsidence, with a reduction  rate of up to 92.3%. The slurry grouting compacts the residual voids in the  goaf, slowing the further subsidence of the collapsed area. It also provides  lateral support and a barrier to water infiltration in the residual coal  pillars. Additionally, the slurry improves the stress conditions of these  coal pillars, transforming the initial unidirectional (or bidirectional)  stress state into a bidirectional (or triaxial) stress state. This  significantly enhances the support strength and stability of the coal  pillars.