关键词: 充填节理, 酸性环境, 干湿循环, 劣化效应, 动力特性

Abstract: In order to explore the damage characteristics of filled jointed rocks under dry-wet cycles in acidic environment, some experimental studies are carried out in the present study. Firstly, the prefabricated filled jointed rock samples are treated with different number of dry-wet cycles under acidic and neutral environments. Then, the uniaxial compression test and dynamic impact test are carried out by universal testing machine and split Hopkinson pressure bar (SHPB) device. Accordingly, the degradation effects of longitudinal wave velocity, static compressive strength and dynamic compressive strength of the filled jointed rock under the action of dry and wet cycles in acidic and neutral environments are analyzed. The results show that the wave velocity, static compressive strength, and dynamic compressive strength of the filled jointed rock continue to decrease, and the degree of deterioration continues to increase with the increase in the number of wet and dry cycles, whether in acidic or neutral environments. The static compressive strength deteriorates most obviously under acid dry-wet cycling. In addition, it is found that there are linear relationships between the static and dynamic compressive strengths and wave velocity values of the filled jointed rocks subjected to dry-wet cycles; the degree of pulverization of the joint filling layer and the degree of rock fragmentation on both sides are more serious under the dry-wet cycles in acidic environment. The research results can provide a scientific basis for the stability analysis of engineering rock mass under the action of dry-wet cycles in an acidic environment.

Key words: filled rock joint, acidic environment, dry-wet cycle, degradation effect, dynamic compression properties