在现场地应力测量过程中发现了岩芯饼裂、钻孔径缩和钻孔破碎塌孔等现象，分析了这些现象的力学机理。
During course of in situ stress measurement, some problems such as core discing, minification and caving of borehole due to horizontal stress are appeared, and their mechanism is studied.
并通过断口电镜扫描试验，得到岩芯饼化的微观断裂机制。
Simultaneously, by applying scanning electron microscope technique for discs? surface, the micro-damage mechanism was discussed.
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