A Study of Borehole Breakouts and Core Disking as Potential Indicators of In Situ Stress Magnitudes

9405836 Haimson PI将在远场边界条件下进行钻孔突破和岩心盘面的实验室实验，并将应力路径最接近地模拟实际现场情况。试验将在花岗岩和砂岩上进行。样品将仔细表征微观结构的失效机制。最终结果将是对两种相关现象进行更真实的模拟，更好地理解导致岩心和钻孔破坏的强度准则，并根据两种岩石类型的工作模型和校准的数值模型得出关于突出和岩心盘与地应力量级关系的实用结论。* * * *

9405836 Haimson The PI will conduct laboratory experiments on borehole breakouts and core disking under far-field boundary conditions and stress paths most closely simulating real field situations. Tests will be carried out on a granite and a sandstone. Samples will be carefully characterized microstructurally for failure mechanisms. The net result will be a more realistic simulation of the two related phenomena, a better understanding of the strength criteria leading to core and borehole failure, and practical conclusions regarding the relationships of breakouts and core disks to in situ stress magnitudes in terms of working models and calibrated numerical models for each of the two rock types. ****