The point load strength index is a widely used index in rock engineering, and cylindrical core and irregular shaped specimens are used in its determination. But, in mine sites, the borehole cores are cut axially into two equal parts to obtain half-cut cores and one part of these half cores is sent to laboratory for geochemical analyses. This situation causes a problem that the remaining half of the cores from the specimens cannot be used not only in the strength and deformability tests, but also in the point load test. In this study, it is aimed to investigate the applicability of the point load test on half-cut cores, to adopt the previously suggested size correction formulations to the half-cut core specimens and to estimate the uniaxial compressive strength from the point load strength index determined from the half-core specimens. To achieve these goals, point load strength index and uniaxial compression tests were conducted on a number of half-cut and cylindrical core samples prepared from 12 different rock types and the test results were assessed based on the statistical analyses. The analysis results indicated that the point load strength index may also correctly be determined from the half-cut cores and uniaxial compressive strength may be estimated from the size corrected point load strength index values of half-cut cores with a low error margin using average size correction factor.

中文翻译：

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半切芯试样的点载荷强度指数与单轴抗压强度的相关性

点载荷强度指标是岩石工程中广泛使用的指标，其测定采用圆柱形岩心和不规则形状的试件。但是，在矿场中，钻孔岩心被轴向切割成两等份以获得半切岩心，并将这些半岩心的一部分送到实验室进行地球化学分析。这种情况会导致一个问题，即试样中剩余的一半芯不仅不能用于强度和变形性测试，而且不能用于点载荷测试。在本研究中，旨在研究点载荷试验对半切岩心的适用性，采用先前建议的尺寸修正公式对半切岩心试样，并从点载荷强度指数估计单轴抗压强度由半芯试样确定。为了实现这些目标，对由 12 种不同岩石类型制备的多个半切和圆柱形岩心样品进行了点载荷强度指数和单轴压缩试验，并根据统计分析评估了试验结果。分析结果表明，点载荷强度指数也可以从半切芯中正确确定，单轴抗压强度可以从半切芯的尺寸校正点载荷强度指数值中估计，使用平均尺寸具有较低的误差容限。修正系数。