A number of studies have been conducted to investigate the relationships between point loading strength (PLS) and uniaxial compressive strength (UCS). The method is widely used in on-site tests because it is convenient and the requirement for the sample in PLS is not very strict. However, it's difficult to get an accurate relationship between UCS and PLS in laboratory due to strong heterogeneity of rocks. Discrete element method (DEM) has been proved to be a great tool to simulate and analyze the behavior of rock material. In DEM, the particle properties (such as particle contact modulus) can be set to ensure the rock materials to possess the same properties. So we can get the correct correspondence between PLS and UCS. In this paper 23 sets of data are simulated which from the laboratory test, and it is found that there are good correspondences. Through further analysis, the authors also discuss the influence of experimental conditions on the PLS by DEM, which includes indenter radius, aspect ratio and particle size. By the simulations, we reached three conclusions: 1) the simulated result is higher than that of laboratory test in PLS because of homogeneity; 2) the larger indenter radius, the higher PLS will be; 3) PLS is nearly a constant when the aspect ratio of samples is between 0.3 andl. Besides, if the aspect ratio is lower than 0.3, the PLS will increase rapidly.
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