关键词: 柱状节理玄武岩;相似材料;地质力学模型试验;正交试验;极差分析;方差分析;

Abstract: In recent years, special rock masses such as columnar jointed basalt have been encountered in the engineering construction, especially in the Baihetan Hydropower Station.When the geological and mechanical model tests are carried out, not only the physical and mechanical properties of the joints but also the similar materials for basalt are important.We designed orthogonal experiments using α-hemihydrate gypsum, barite, quartz sand and water and carried out sensitive analysis on the physical and mechanical parameters of the similar materials with different mixing ratio.The results show that the density of similar materials is most significantly affected by the binder-aggregate ratio and has a negative correlation with the binder-aggregate ratio.The uniaxial compressive strength, elastic modulus and tensile strength are most significantly affected by the water-binder ratio and all have larger values under low water-binder ratio.Each factor has a certain relationship with Poisson ratio, cohesion and internal friction angle but has no significant effect on them when the confidence is 95%.The parameters of similar materials have wide range under different proportions, which lays foundation for geological and mechanical model tests of columnar jointed basalt.

Key words: columnar jointed basalt; similar materials; geological and mechanical model test; orthogonal test; range analysis; variance analysis;