Alteration in Material Properties of an Intact Rock due to Drilling and Bolting Operations

Table 4

Comparison of results for all cases.

Parameters	Case I		Case II		Case III		Case IV
	𝐶	𝑅	𝐶	𝑅	𝐶	𝑅	𝐶	𝑅
𝜎1, MPa	8.45	1.31	13.96	1.68	14.38	1.68	14.12	1.68
𝜎3, MPa	0.74	0.06	1.70	0.18	1.65	0.27	1.69	0.20
𝜎𝑧, MPa	5.10	2.12	7.46	2.94	7.68	3.00	7.89	2.66
HD, m	0.001	0.049	0.000	0.046	0.000	0.052	0.000	0.048
VD, m	0.018	0.005	0.011	0.005	0.013	0.005	0.012	0.005
TD, m	0.018	0.049	0.011	0.046	0.013	0.052	0.012	0.049

𝐶: at crown (𝑥=5, 𝑦=15); 𝑅: point right to crown (𝑥=10, 𝑦=10); 𝜎₁: major principal stress; 𝜎₃: minor principal stress; 𝜎_𝑧: out of plane principal stress; HD: horizontal displacement; VD: vertical displacement; TD: total displacement.