Experimental Study on Deformation and Acoustic Emission Characteristics of Arch Roadway under Different Unloading Rates

Figure 7

Tangential strain characteristics of roadway surrounding rock. (a) The roof. (b) The side wall. (c) The floor. The solid line represents 0.05 MPa/s; the dotted line represents 2 MPa/s.

(a)

(b)

(c)