Quantitative Characterization of Overburden Rock Development Pattern in the Goaf at Different Key Stratum Locations Based on DEM

Table 4

Results of uniaxial compressive strength of partially tested rock.

Layer number	Lithology	Single axis compressive strength/MPa	Theoretical value of materials	Empirical value/kPa	Error/%
J12	Medium grain sandstone	48.93	215.29	214.06	0.57
J11	Mudstone	42.15	185.46	187.53	1.10
J10	Sandy mudstone	56.43	248.29	251.34	1.21
J9	Mudstone	51.73	227.70	222.03	2.55
J8	Post office box stone	75.11	330.48	327.85	0.80
J7	Mudstone	32.09	141.19	141.53	0.23
J6	Medium grain sandstone	33.48	147.31	146.12	0.81
J5	Sandy mudstone	27.15	119.46	117.7	1.49
J4	Medium grain sandstone	30.07	132.30	133.07	0.57
J3	Sandy mudstone	23.23	102.21	99.00	3.24