Nonlinear Creep Behavior and Viscoelastic-Plastic Constitutive Model of Rock-Concrete Composite Mass

Figure 4

Step loading time-stress-strain curves of rock-concrete composite specimens under different confining pressures. (a) Confining pressure 0 MPa. (b) Confining pressure 7 MPa. (c) Confining pressure 15 MPa. (d) Confining pressure 22 MPa.

(a)

(b)

(c)

(d)