Mechanical behaviour of a jointed rock mass with a circular hole under compression-shear loading: Experimental and numerical studies. (August 2021)

• Record Type: Journal Article
• Authors: Lin, Qibin; Cao, Ping; Liu, Yinzhu; Cao, Rihong; Li, Jiangteng
• Is Part Of: Theoretical and applied fracture mechanics. Volume 114(2021)
• Publication Date: 2021-08
• Subjects: Jointed rock mass -- Circular hole -- Compression-shear loading -- Mechanical behaviour -- Crack coalescence; Fracture mechanics -- Periodicals; 620.1126
• DOI: 10.1016/j.tafmec.2021.102998
• Languages: English
• ISSNs: 0167-8442

Abstract

Highlights: Jointed rock mass containing a circular hole specimen under compression-shear loading were analysed by DIC and DEM modelling. Analysed the effect of joint inclination on strength behaviour of the specimen under compression-shear loading. The crack evolution process was investigated and four types of crack coalescence among joints were summarized. Three kinds of crack coalescence between joints and hole were found. Abstract: The tunnels excavated in a mountain body interact with the jointed rock mass under compression-shear and present a complex stress state. The joints often have a significant influence on the possible damage points of tunnels. However, the failure behaviour of jointed rock mass with a hole under the compression-shear condition is still unclear. The crack coalescence mechanism needs to be further explored. In this study, compression-shear tests were carried out on jointed rock-like specimens containing a circular hole. The corresponding numerical model was established by the discrete element method (DEM) modelling. The results show that with the increase in joint inclination, the peak load first increases and decreases. Four types of crack coalescence among joints and three kinds between joint and hole were found. The crack coalesces with the hole easily occur on both sides of the hole. When the joint inclination is small, the crack coalesces through the shear slip. However, the tensile crack coalesces with the joints and hole when the joint inclination is large. Finally, the failure behaviour of the specimen was further analysed based on the displacement field. The experimental results also verify the above analysis and agree well with simulation results.