Energy Release Analysis of a Severe Rockburst in a Headrace Tunnel Crossing a Tectonic Stress Zone

Table 4

Mean values of stress components in the local coordinate system (measurement results at chainage 10 + 938).

−83.8

−44.7

−47.8

−2.0

−26.0

12.7

Stress positive-negative regularity follows linear elastic mechanics. Positive normal stress is tensile stress, and negative is compressive stress. The direction of local coordinate is shown in Figure 5.