王伟超, 朱高房.盐岩破坏中能量特征应变率效应颗粒流分析[J].河南理工大学学报（自然科学版）,2020,39(6):144-151.

WANG W C, ZHU G F.Particle flow analysis on strain rate effect of energy characteristics insalt rock failure[J].Journal of Henan Polytechnic University(Natural Science) ,2020,39(6):144-151.

盐岩破坏中能量特征应变率效应颗粒流分析

王伟超, 朱高房

河南理工大学 土木工程学院，河南 焦作454000

摘要:为研究不同应变速率下盐岩损伤中的能量特征，结合室内单轴压缩试验和颗粒流程序（PFC-2D）进行不同应变率下盐岩模型模拟试验，分析盐岩模型的峰值强度，并运用岩石能量耗散理论分析不同应变速率下盐岩模型峰值强度处能量特征和单轴压缩过程中能量特征变化。结果表明：盐岩模型峰值强度随应变速率增加而增大；盐岩模型峰值强度处对应的总输入能量、可释放弹性应变能和耗散应变能均随应变速率的增加而增加；不同应变率下盐岩模型在相同压缩阶段能量特征变化基本相同，能量随轴向应变整体变化趋势受应变速率的影响较小；同一应变率下不同压缩阶段能量特征变化趋势不同，弹性阶段大部分外力功转化成可释放应变能；塑性阶段耗散应变能快速大幅增加；在破坏阶段耗散应变能持续增加，但弹性应变能出现降低。

关键词:盐岩破坏;能量特征;应变率效应;颗粒流程序

doi:10.16186/j.cnki.1673-9787.2020.6.21

基金项目:河南省科技攻关项目（162102210064）；河南省高校基本科研业务费专项资金资助项目（NSFRF140145 ）

收稿日期:2020/02/09

修回日期:2020/04/21

出版日期: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