Similarity Model Test on the Spatiotemporal Evolution Law of Deformation and Failure of Surrounding Rock-Induced Caving in Multi-Mined-Out Areas

Table 2

The ratio of similar materials’ model test.

Materials	River sand (%)	Plaster (%)	Cement (%)	Rosin alcohol saturated solution (%)	Water (%)	Mica slice (%)
Ratio	78	4	7	2	8	1