A Study on the Effects of Loading Axial Pressure Rate on Coal Mechanical Properties and Energy Evolution Law

Table 1

Test results.

Number	Loading axial pressure rate /(MPa/s)	Lateral strain /10^-3	Volume strain /10^-3	Confining pressure /MPa	Axial strain /10^-3	Failure strength /MPa	Average failure strength /MPa
1	0.05	-5.409	-8.234	1.107	2.585	39.755	39.317
2	0.05	-5.909	-9.024	0.023	2.794	41.227
3	0.05	-6.542	-10.133	3.451	2.952	36.969
4	0.1	-3.845	-3.317	8.205	4.374	44.802	53.159
5	0.1	-6.458	-6.549	4.155	6.367	52.851
6	0.1	-4.830	-3.769	3.358	5.892	54.071
7	0.2	-4.551	-1.147	9.804	7.954	61.750	60.879
8	0.2	-8.235	-7.519	8.600	8.951	67.611
9	0.2	-4.691	-2.550	11.977	6.832	53.275
10	0.4	-4.170	-0.781	15.755	7.578	55.432	63.814
11	0.4	-8.169	-4.961	14.543	11.378	65.524
12	0.4	-8.102	-4.360	13.929	11.845	70.485