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

Table 4

Statistics of strain versus time after drilling, borehole diameter, and spacing.

Testing time	24 h	72 h	168 h	240 h	288 h	360 h	432 h	480 h
Diameter of borehole (mm)	0.09	0.15	0.26	0.43	0.55	0.71	0.71	0.71
Maximum strain (με)	6	12	17	45	100	138	170	171