Mechanism of shear deformation, failure and energy dissipation of artificial rock joint in terms of physical and numerical consideration

作者：Zhang, Xuepeng; Jiang, Yujing^*; Wang, Gang; Liu, Jiankang; Wang, Dong; Wang, Changsheng; Sugimoto, Satoshi

来源：Geosciences Journal, 2019, 23(3): 519-529.

DOI：10.1007/s12303-018-0043-y

• energy dissipation
• shear behavior
• acoustic emission
• joint

The physical and mechanical change processes of rock are closely related to energy transformation, and its deformation and failure is an instability phenomena driven by energy exchange. This study investigated mechanism of shear deformation, failure and energy dissipation of joint using both physical and numerical direct shear tests under constant normal load (CNL) condition. Three kinds of joint surface were artificially prepared. An acoustic emission system was employed to monitor acoustic emission in physical test, and rupture frequency was recorded in numerical test to represent micro-crack development. By research of numerical micro-crack development accompanied with physical acoustic emission results, mechanism of shear deformation and failure of joints were illustrated schematically. By definition of dissipation energy, captured using the particle flow code (PFC2D), energy releasing and dissipation were discussed with microscopic damage evolution of joints. Results showed that joints under shearing present a dissipation trend of four stages including a slow rise stage, a rapid rise stage, a shock rise stage and a rapid decline stage.

• 出版日期2019-6
• 单位山东科技大学