Research Article

A Study of Acoustic Emission and Damage Evolution of Limestone under Different Stress Paths and Confining Pressures

Figure 3

The experimental design of three stress paths ( is the peak compressive strength under different confining pressures in Scheme 1; and represent the moment when the confining pressure in Schemes 3 and 2 begins to change, and represents the moment when the sample in Scheme 1 is in peak stress).