doi:10.16186/j.cnki.1673-9787.2020.6.21

Received:2020/02/09

Revised:2020/04/21

Published:2020/11/15

Particle flow analysis on strain rate effect of energy characteristics insalt rock failure

WANG Weichao, ZHU Gaofang

School of Civil Engineering， Henan Polytechnic University ，Jiaozuo 454000 ， Henan， China

Abstract:In order to study the energy characteristics of salt rock damage under different strain rates， combined with indoor uniaxial compression tests and particle flow program （ PFC-2D ） ， the salt rock model simulation test under different strain rates were carried out. The peak strength of the salt rock model was analyzed. The energy characteristics at the peak strength of salt rock model and the energy characteristics change during uniaxial compression under different strain rates were analyzed by using the rock energy dissipation theory. The results showed that the peak strength of salt rock model increase with the increase of strain rate. The total input energy ，the releasable elastic strain energy and the dissipative strain energy at the peak strength of the salt rock model increased with the increase of strain rate. The energy characteristics of the salt rock model were basically same at the same compression stage under different strain rates. The overall trend of energy with axial strain was less affected by strain rate. The energy characteristics change trend was different under different compression stages at the same strain rate. The most of the external work was converted into the releasable strain energy during the elastic phase. The dissipative strain energy increases significantly during the plastic phase. The dissipative strain energy continues to increased during the failure phase， but the elastic strain energy decreased.

Key words:salt rock failure;energy characteristic;strain rate effect;particle flow

盐岩破坏中能量特征应变率效应颗粒流分析_王伟超.pdf