Experimental Investigation on the Energy Storage Characteristics of Red Sandstone in Triaxial Compression Tests with Constant Confining Pressure

Figure 4

Stress-strain curves of eight confining pressures in TSCLUC tests. (a), (c), (e), (g), (i), (k), (m), and (o) axial loading-unloading curves and (b), (d), (f), (h), (j), (l), (n), and (p) circumferential loading-unloading curves. (a) = 5 MPa, (b)  = 5 MPa, (c)  = 10 MPa, (d)  = 10 MPa, (e)  = 15 MPa, (f)  = 15 MPa, (g)  = 20 MPa, (h)  = 20 MPa, (i)  = 30 MPa, (j)  = 30 MPa, (k)  = 40 MPa, (l)  = 40 MPa, (m)  = 50 MPa, (n)  = 50 MPa, (o)  = 60 MPa, and (p)  = 60 MPa.

(a)

(b)

(c)

(d)

(e)

(f)

(g)

(h)

(i)

(j)

(k)

(l)

(m)

(n)

(o)

(p)