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Strategies for rock slope failure early warning using acoustic emission monitoring

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Figure

Figure 2. Schematic of operation of the AE monitoring for soil slopes including sensor node and communication system, after [9,10]
Figure 3. Passo della Morte (Italy): (a) schematic of the unstable limestone rock mass and position of waveguides (AEWG1, 2, 3), along with TDR cables, extensometers, MEMS accelerometers, an inclinometer, piezometer, a down-hole accelerometer and a seismog
Figure 4. High AE rate events. EXT4, EXT5 were not operating until 10/01/2013. Piezometric level is referred to the well-head placed in the tunnel at an altitude of 720 m a.s.l.
Figure 5.  AE rate (RDC/hour) in response to changes in water pressure within the rock mass
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