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为考察高温作用对岩石物理及力学特性的影响,对经历常温~900℃高温处理后花岗岩圆盘试样进行巴西试验,分析了高温后岩样的物理性质(如颜色、体积、质量和密度)变化,研究了力学性质(如荷载-位移曲线、拉伸强度和刚度)与温度关系,探讨了高温后花岗岩裂纹演化特征.试验结果表明,高温作用后花岗岩体积增大,而质量和密度减小.随着温度的升高,花岗岩试样峰后脆性减弱,延性增强,拉伸强度呈先增大后减小趋势.含孔试样拉伸强度低于完整岩样,而且降幅与孔洞分布倾角密切相关.水平和倾斜分布孔洞试样是由于中心孔边缘萌生的裂纹造成劈裂破坏,而竖直分布孔洞试样是由于3个孔洞边缘萌生的裂纹贯通导致最终破裂.
In order to investigate the influence of high temperature on the physical and mechanical properties of rock, the granite disk samples from Brazil under high temperature of 900 ℃ were tested in Brazil. The physical properties (such as color, volume, mass and density) The relationship between mechanical properties (such as load-displacement curve, tensile strength and stiffness) and temperature was studied, and the evolution characteristics of post-high temperature granite cracks were discussed.The results show that granite increases in volume and mass and density decrease after high temperature .With the increase of temperature, the post-embay brittleness of granite samples decreases, ductility increases, the tensile strength first increases and then decreases, and the tensile strength of granite samples is lower than that of intact samples, The samples with horizontal and oblique distribution of holes were caused by the crack initiation at the edge of the center hole, whereas the samples with vertical distribution were caused by the initiation of cracks at the edge of the three holes leading to the final rupture.