Abstract
The existence of parallel joints has an impact on the size effect of the uniaxial compressive strength of rock, but the relationship is yet to be obtained. In this paper, the influence of parallel-joint spacing on the size effect and characteristic size of rock uniaxial compressive strength is studied by establishing five types of parallel-joint-spacing simulation schemes. The influence of parallel-joint spacing on the size effect of rock uniaxial compressive strength is explored by analyzing the stress–strain curves of rocks with different parallel-joint spacings and rock sizes. The relationship between the uniaxial compressive strength and the size of the rock with parallel joints and its special mathematical model are obtained, and the particular form of the compressive-strength characteristic size and parallel-joint spacing is obtained.
Highlights
Compressive strength is one of the mechanical properties of rock strength and has a size effect (SE)
According to the data therein, a scatter diagram of the parameters and the PJ spacing (PJS) was drawn, with the PJS taken as the abscissa and the parameter value taken as the ordinate
The size of the rock with parallel joints (PJs) has an influence on the uniaxial compressive strength (UCS), and the PJS has an influence on the characteristic size of the compressive strength, but their relationships have not yet been obtained
Summary
Compressive strength is one of the mechanical properties of rock strength and has a size effect (SE). Scholars have studied the SE of the compressive strength of rocks. Fu [1] obtained the law governing the SE of rock compressive strength by preparing hard rock specimens with different height-to-diameter ratios for uniaxial compression tests. Lu et al [2] conducted uniaxial compression tests on soft rocks with different height-to-diameter ratios based on gray relational analysis to study the SE of soft rock strength. Meng et al [3] studied the SE of the strength of mudstone and sandstone based on numerical simulations. The above scholars studied the strength of different types of rocks and found that the compressive strength of rocks has an SE. With the deepening of research, scholars have analyzed the reasons for the SE of rock strength. Yan et al [4] used the FLAC3D software to study the SE of heterogeneous rock strength and showed that the SE of rock strength is related to the heterogeneity of the rock
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