Numerical simulation of stress relieving and analysis of influencing factors on geostress measurement

摘要

At present, over coring method by using hollow inclusion strain cells are applied widely for geostress measurement. But there are some errors in measurement accuracy. In order to improve the measurement precision and reliability of stress relief method, the paper analyzed the influence of drilling aperture ratio on stress. Studies shows that drill holes will cause the loss of displacement and change the aperture ratio of the drilling will cause variation of losing displacement and correction coefficient K_1. The equation of losing displacement and drilling ratio is β = 0.5546r~((-1.856)) + 0.06. Finally, using simulated conclusions analyzed geostress measurement data of Datai mine and verified the validity and feasibility of the formula. It can provides reference for field measurement precision.