Evolution of Strength Parameters for Sandstone Specimens during Triaxial Compression Tests

Table 2

c and for different plastic internal variable values.

(×10^−4)	(MPa)	(°)
3	47.1	21.9
6	50.5	22.5
9	51.7	23.5
12	52.5	24.2
15	52.7	24.9
18	52.6	25.5
21	52.7	25.9
24	52.5	26.4
27	52.1	26.9
30	51.8	27.3
33	51.4	27.6
36	51.1	27.9
39	50.7	28.3
42	50.4	28.5
45	50	28.8
48	49.5	29
51	49.2	29.2
54	48.8	29.4