EGU2020-13081
https://doi.org/10.5194/egusphere-egu2020-13081
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Dynamic Stress Concentration Around Shallow-Buried Circle Cavity Under Transient P Wave Loads in Different Conditions

Ming Tao, Linqi Huang, Xibing Li, and Shaofeng Wang
Ming Tao et al.
  • Central South University, Hunan Key Lab of Resources Exploitation and Hazard Control for Deep Metal Mines, School of Resources and Safety Engineering, Changsha, China (mingtao@csu.edu.cn)

Based on the large-arc assumption, an analytical model is established and solved by using the complex variable function method to illustrate the dynamic stress concentration around a shallow-buried cavity under transient loads. The jump points in the dynamic stress concentration factor (DSCF) curve that do not in line with the overall trend is filtered out to obtain more reasonable results. The convergence speed of the Graf addition formula is examined, as well as the effects of the incidence angle, frequency, and burial depth on the DSCF around the cavity. Examples show that a larger arc radius and a higher incident frequency correspond to slower convergence of the Graf addition formula. There are differences between the DSCF distributions of high-frequency incidents (such as blasting waves) and low-frequency incidents (such as seismic waves). There are three tensile-stress zones and three compressive-stress zones approximately equally spaced around the cavity in the low-frequency case, and there are two tensile-stress zones and two compressive-stress zones in the high-frequency case. Regarding the variation of the DSCFs with respect to the cavity depth, incidence angle and position of wave peak there are significant differences between the high- and low-frequency cases.

How to cite: Tao, M., Huang, L., Li, X., and Wang, S.: Dynamic Stress Concentration Around Shallow-Buried Circle Cavity Under Transient P Wave Loads in Different Conditions, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-13081, https://doi.org/10.5194/egusphere-egu2020-13081, 2020