Stability of Close Chambers Surrounding Rock in Deep and Comprehensive Control Technology

Table 1

Test results of uniaxial compressive strength.

Sample category	Number	Compression strength (MPa)	Elastic modulus (GPa)	Poisson’s ratio	Average compressive strength (MPa)	Average elastic modulus (GPa)	Average Poisson’s ratio
Siltstone	B1-1	42.75	4.62	0.39	48.23	5.88	0.36
	B1-2	53.71	7.14	0.23
	G1-1	23.37	9.66	0.27	31.62	7.98	0.31
	G1-2	39.88	6.30	0.35
	J1-1	67.50	1.26	0.47	66.36	2.10	0.45
	J1-2	65.21	2.94	0.43