The Behavior of a Coarse Granular Material under Complex Stress Conditions

Table 2

Test program and corresponding peak states.

Test	b value	Lode angle	σ3 = 200 kPa		σ3 = 400 kPa		σ3 = 800 kPa
			p/MPa	q/MPa	p/MPa	q/MPa	p/MPa	q/MPa
Constant σ3 and constant b tests	0.00	−30	0.556	1.067	0.952	1.655	1.826	3.078
	0.150	−22.0	0.706	1.183	1.188	1.901	—	—
	0.25	−16.1	0.827	1.293	1.425	2.180	2.506	3.681
	0.375	−7.9	0.965	1.458	1.706	2.480	—	—
	0.50	0	1.106	1.574	1.961	2.710	3.414	4.524
	0.625	8.5	1.292	1.764	2.284	3.044	—	—
	0.75	16.1	1.431	1.900	2.529	3.283	4.037	4.998
	0.875	23.7	1.889	2.547	2.628	3.363	—	—
	1.00	30	1.987	2.681	2.732	3.498	—	—
Plane strain tests	—	—	0.749	1.260	1.264	2.057	2.287	3.637