Mechanical Properties and Energy Dissipation of Sandstone under Cyclic Loading-Unloading

Table 2

Elastic modulus of sandstone at different loading-unloading stages under different upper-stress limits (GPa).

Number of cycles	0.2		0.4		0.6		0.8
	Load	Unload	Load	Unload	Load	Unload	Load	Unload
1	51.082	53.219	49.737	49.372	35.101	37.948	30.027	34.029
2	59.650	64.351	56.236	60.512	43.241	47.657	37.427	40.989
3	64.230	68.787	60.216	64.494	49.385	51.950	43.858	46.819
4	67.269	72.369	62.540	66.102	51.401	54.535	47.724	51.713
5	69.298	73.672	63.984	70.396	54.412	56.406	50.737	53.725
6	71.904	74.121	65.714	70.400	54.574	57.567	52.324	54.193