THE CT TEST FOR POROUS STRUCTURAL CHANGE UNDER COMPRESSIVE LOAD
压缩载荷下孔隙结构变化的CT实验研究

In order to investigate the influence of pores on mechanical properties of rock, porous physical models were developed, and through the uniaxial compressive and CT scanning tests, the evolution of porous structure with different porosity on rock and the influence of porous structure on macroscopical physical/mechanical properties are studied under various loading conditions. The crack growth law of pore models and the damage law of pores and solid media are obtained for different loads and CT observation scales. The test results indicate that the most of cracks appear after the peak value of tensile strength is reached. The main cracks appear in the place of densely distributed pores with many minor cracks. Before the peak value, a few minor cracks appear around pores.