Investigation of Pressure Relief Borehole Effects Using In Situ Testing Based on Distributed Optical Fibre Sensing Technology

Figure 16

External test in 10# borehole: (a) drilled after 48 h, (b) drilled after 168 h, (c) drilled after 240 h, and (d) drilled after 432 h.

(a)

(b)

(c)

(d)