Backfill Creep Constitutive Model And Its Engineering Applications

Backfill is widely applied among mine production practice.So it is needed to research creep properties of backfill because of long-term stability influenced by ageing effect.Right now,the creep constitutive model research mainly focus on fitting the experiment data,while the experiment data used in engineering practice rare,so as to the stationary parameter creep constitutive model research among creep constitutive model research.Otherwise,there have some papers studied non-stationary parameters creep constitutive model,but have no detailed step-by-step instructions.The following are the main researches:(l)Using Particle Swarm optimization(PSO) to uniaxial creep experiment inversion,and through the analysis of the creep parameters'sensitivity to stress level to determine the non-stationary parameters creep constitutive model of backfill,for better engieering aplication.(2)Realization the non-stationary parameters of backfill H-K creep constitutive model's secondary development in FLAC 3D soft.(3)Analysing the long-term strength of backfill based on experiment data.(4)Research into surrounding rock's variety by site monitoring stress-strain data.(5)Applied the non-stationary parameters of H-K creep constitutive model to simulate engineering projects.