Development of a Novel Triaxial Rock Testing Method Based on Biaxial Test Apparatus and Its Application

Excerpt

As underground engineering projects and energy development projects continuously go deeper, rock disasters such as rock bursts, collapse, and water inrushes occur more frequently, bringing unprecedented challenges to the researchers in the field of disaster prevention and control (Wang et al. 2019a; b). The study on mechanical behaviors and engineering properties of rock under real stress state is of great significance for understanding the mechanism of rock fracture and deformation instability. The laboratory experiment is a significant approach and some novel test apparatus have been developed for specific rock failure modes in recent years. Representatively, Feng et al. (2016) modified the original Mogi-type triaxial testing apparatus to acquire a higher test accuracy and emulate three-dimensional stress paths in deep rock engineering. Zhang et al. (2018) developed a uniaxial tensile test apparatus and meet the requirement of obtaining tensile strength, tensile elastic modulus, maximum tensile strain, and complete stress–strain curves. Furthermore, Zeng et al. (2019) proposed a simple auxiliary apparatus to implement triaxial extension tests of cylindrical rock specimens, which can both realize the pure tensile stress state simulation. Regarding the different shear failure mechanisms, various apparatuses were successfully designed to conduct shear tests under different stress states, including compression-shear, tension-shear, and pure shear (Liu et al. 2017; Huang and Zhu 2019; Zhu and Huang 2019; Cen et al. 2020; Huang et al. 2020; Zhong et al. 2020). These new experimental technologies actively promote the study of rock mechanics. …