Creep characteristics and damage constitutive model of red sandstone under dynamic disturbance
To investigate the creep characteristics of rocks under dynamic disturbance,multistage impact-disturbance creep experiments were conducted on fine-grained red sandstone using a self-developed impact-disturbance creep loading experiment device.Transient deformation and creep behaviors were analyzed under different creep stresses and disturbance energies.The effects of disturbance energies on long-term strengths were obtained through indirect calculations.The results indicate that dynamic disturbance densifies the specimen at lower creep stresses and intensifies internal damage when the creep stress exceeds a certain threshold.Transient deformation and creep strain induced by dynamic disturbance initially decrease and then increase with creep stress.As dynamic disturbance energy increases,the failure strain of the specimen increases,but the long-term strength decrease.The correlation between long-term strength and disturbance energy,dynamic disturbance unit,and disturbance-damage viscous element are introduced to establish a viscoplastic disturbance-damage creep model.This model,validated by experimental data,accurately describes the transient deformation and creep behavior of sandstone under the combined action of static constant load and dynamic disturbance.The research findings have significant theoretical implications and practical applications for the support design and safe production of drilling and blasting tunnels.
disturbance-creep experimentcreep characteristicsdynamic disturbancedamage creep model
万方数据
维普
