Study on the Life-Cycle Health Monitoring Technology of Water-Rich Loess Tunnel

Figure 4

The distributed optical fiber installation flowchart: (a) carving slot and routing on the sidewall, (b) carving slot and routing on the crown, (c) laying of protection layer, (d) fiber splicing, and (e) debugging the light circuit.

(a)

(b)

(c)

(d)

(e)