Abstract:

To optimize mining sequence and roadway design of Jinkouling copper mine, we calculate original rock mining stress and acquire its magnitude and direction and their distribution pattern with 3D borehole to relief meter, hollow inclusion strain, surrounding pressure test, and elasticity theory. Results show that maximum main stress direction of each measurement point approximates to horizontal direction, consistent with regional tectonic stress direction. However, minimum main stress direction is close to vertical direction. The three main stresses are all compressive stress, no tensile stress, identical to the measurement of Chinese universal ground stress. The method provides a reference for other similar engineering stress test.

Key words: stress relief method by overcoring, in-situ rock stress, confining pressure test, maximum principal stress, hollow inclusion strain