Constitutive model of rock under static-dynamic coupling loading and experimental investigation
(School of Resources and Safety Engineering, Central South University, Changsha 410083, China)
Abstract: The importance of study on constitutive model of statically loaded rock experiencing dynamic load is set forth, and the studying methods on dynamic constitutive model are classified according to the current studying status. By way of combining statistic damage model and viscoelastic model, uni-axial and multi-axial constitutive models of statically loaded rock experiencing dynamic load (static-dynamic coupling constitutive model) under intermediate strain rate are established. The verification experiment on 2D constitutive model under different static stress and dynamic stress with different frequencies is designed and performed. It is found that there is a good agreement between the experimental stress-strain curves and the theoretical stress-strain curves.
Key words: dynamic load; static-dynamical coupling loading; intermediate strain rate; constitutive model; damage; viscoelasticity