Failure Mechanism and Optimization of Arch-Bolt Composite Support for Underground Mining Tunnel

Figure 4

Evolution curves of Scheme 2 (ground stress 5 MPa) and Scheme 3 (ground stress 10 MPa). (A)∼(E): Evolution curves of roadway displacement, arch axial force, arch bending moment, arch supporting force, and rock bolt axial force of Scheme 2, respectively; (F)∼(J): Evolution curves of roadway displacement, arch axial force, arch bending moment, arch supporting force, and rock bolt axial force of Scheme 3, respectively. (a) Scheme 2 (5 MPa). (b) Scheme 3 (10 MPa).

(a)

(b)