本文按空间问题模拟了钻孔、岩芯和钻孔周围的地应力,计算了五种不同水平地应力组合情况下应力解除后,岩芯中的应力状态和应力相对系数;分析了饼状岩芯破裂的成因;找出了容易使岩芯形成饼状破裂的地应力组合情况;推导出了各种组合情况饼状岩芯破裂的始点地应力和临界地应力公式,并与实测结果进行了比较。提出了划分高地应力界线的建议。 This paper simulates the ground stress around the borehole, core, and borehole according to the space problem, and calculates the stress state and stress relative coefficient in the core after stress relief under five different levels of in-situ stress combinations; analyzes the pie-shaped rock. The causes of core rupture; the combination of ground stress that could easily make the core break into a cake shape; and the formulas for the starting point stress and the critical ground stress of cracking of cake cores in various combinations were deduced, and the results were measured. Compare. Proposals for dividing high ground stress boundaries are proposed.