Fracture Propagation and Hydraulic Properties of a Coal Floor Subjected to Thick-Seam Longwalling above a Highly Confined Aquifer

Table 2

Choice of volumetric strain-permeability curves.

Name of paper	Lithology	Geological time	Sampling location	Other characteristics
Fan et al. [19]	Sandstone	Quaternary	Yili, Xinjiang	Weakly cemented
Yu et al. [28]	Red sandstone	Quaternary	Ganzhou, Jiangxi	Ordinary
Xia et al. [29]	Sandstone	Carboniferous	Taiyuan, Shanxi	Ordinary

Notes: the floor of the studied coal seam is mainly composed of ordinary Carboniferous sandstone, and this coal mine is located in Taiyuan, Shanxi Province.