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

小行星9405836 PI将在远场边界条件和最接近模拟真实的现场情况的应力路径下，对钻孔崩落和岩心圆盘进行实验室实验。 测试将在花岗岩和砂岩上进行。 将仔细表征样品的微观结构，以确定失效机制。 最终结果将是对这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标准，并就两种岩石类型中每一种的工作模型和校准数值模型得出关于崩落和岩心盘与原地应力大小的关系的实际结论。 ****

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. ****