Research on In Situ Stress Measurements in Reinforced Concrete Beams Based on the Core-Drilling Method

Table 1

Stress data from boreholes of various diameters.

Depth (mm)	100 mm diameter front borehole stress (MPa)	75 mm diameter front borehole stress (MPa)	50 mm diameter front borehole stress (MPa)	50 mm diameter side borehole stress (MPa)
0	−2.37	−2.35	−2.25	−1.32
5	−2.28	−2.25	−1.98	−0.85
10	−2	−1.63	−1.01	−0.35
15	−1.55	−1.02	−0.24	−0.01
20	−1.05	−0.44	0.18	0.09
25	−0.63	−0.07	0.27	0.12
30	−0.29	0.13	0.22	0.07
35	−0.01	0.22	0.17	0.06
40	0.1	0.24	0.13	0.04
45	0.18	0.22	0.08	0.03
50	0.23	0.17	0.04	0
55	0.25	0.15	0	0
60	0.23	0.12	0	0
65	0.21	0.12	0	0
70	0.18	0.06	0	0