Abstract
The loosened zone around the tunnel and underground caverns comprises the physical damaged and stress concentrated zones. Therefore, Young's modulus and stress should be measured to determine the loosened zone. However, the values of Young's moduli of rock mass measured in situ vary widely owing to the anisotropy of the rock mass. In addition, the measurement of rock stress using current domestic methods is expensive owing to the use of special techniques and equipment. Thus, this paper presents a simple technique to measure and analyze anisotropic Young's moduli and rock stress simultaneously using a borehole jack test.
