Experimental Study on the Mechanical Behavior of Yunnan Limestone in Natural and Saturated States

Figure 12

SEM photomicrograph of Yunnan limestone fracture surface for different test cases. (a) Electron microscope scanning system. (b) Rock slice on the fracture surface. (c) Internal structure in the initial state. (d) Direct tensile test. (e) Uniaxial compression test (confining pressure = 0 MPa). (f) Triaxial compression test (confining pressure = 10 MPa). (g) Triaxial compression test (confining pressure = 20 MPa). (h) Triaxial compression test (confining pressure = 30 MPa). (i) Triaxial compression test (confining pressure = 40 MPa).

(a)

(b)

(c)

(d)

(e)

(f)

(g)

(h)

(i)