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

Table 2

Statistics of maximum strain and yielded zone radius for different borehole diameter.

Borehole diameter (mm)	65			Average	90			Average	108			Average
Borehole number	9^#	14^#	15^#		8^#	12^#	13^#		7^#	10^#	11^#
Maximum strain (με)	94	74	89	86	120	127	126	134	166	179	165	170
Yield radius (m)	0.36	0.32	0.35	0.34	0.44	0.49	0.44	0.46	0.71	0.74	0.68	0.71