Subsidence Prediction of Overburden Strata and Surface Based on the Voussoir Beam Structure Theory

Table 1

Strata thickness and KS location.

Thickness (m)	Depth (m)	Lithology	KS judgement	Limit span (m)
10	10	Topsoil
20	30	Medium-grained sandstone
60	90	Sandy conglomerate	PKS	50.001
10	100	Sandy mudstone
10	110	Coarse-grained sandstone
10	120	Fine-grained sandstone
10	130	Medium-grained sandstone
15	145	Coarse-grained sandstone		23.341
10	155	Fine-grained sandstone	SKS	40
5	160	Mudstone
10	170	Fine-grained sandstone	SKS	16.976
5	175	Siltstone
4.9	179.9	Coal seam