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用岩芯进行径向点荷试验,是简单而较精确地获得岩石抗拉、抗压强度的极有前途的方法。本文利用有限元法分析了受对称径向点荷圆柱形试样的应力分布状态,并据此讨论了试样的破坏现象、点荷强度指数I_s与长径比γ的关系、试样单轴抗拉强度的计算等问题,从而提出了计算点荷强度指数I_s的修正公式(5)和计算试样单轴抗拉强度的公式(8)。用砂岩进行的点荷试验及用电子和光学显微镜进行的试样断口分析表明,理论分析与实测结果基本相符。
Radial point loading tests with rock cores are promising methods for obtaining rock tensile strength and compressive strength simply and accurately. In this paper, the finite element method is used to analyze the stress distribution of a cylindrical specimen with symmetrical radial points. The failure phenomenon, the relationship between the point load strength index I_s and the aspect ratio γ, The calculation formula of tensile strength and so on are put forward. The formula (5) for calculating the point load strength index I_s and the formula (8) for calculating the uniaxial tensile strength of the specimen are proposed. Point load test with sandstone and fracture analysis of the sample by electron and optical microscope show that the theoretical analysis and the measured results are basically consistent.