Compressive damage constitutive model for brittle coal based on the compaction effect and linear energy dissipation law
Fengqiang Gong1
Lei Xu2
Mingzhong Gao3
Yingjie Zhao2
Peilei Zhang4
1.School of Civil Engineering,Southeast University,Nanjing 211189,China;Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization,Institute of Deep Earth Sciences and Green Energy,College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518060,China2.School of Civil Engineering,Southeast University,Nanjing 211189,China3.Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization,Institute of Deep Earth Sciences and Green Energy,College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518060,China;State Key Laboratory of Intelligent Construction and Health Operation and Maintenance of Deep Earth Engineering,Shenzhen University,Shenzhen 518060,China4.School of Resources and Safety Engineering,Central South University,Changsha 410083,China
摘要：The study of the mechanical property and damage state of coal materials under compression is a fundamental area of research in underground mining engineering.Drawing upon the compaction effect and linear energy dissipation(LED)law,a novel compressive damage constitutive model for brittle coal is proposed.Utilizing the energy-defined damage method for mate-rials,the LED law is innovatively introduced to accurately characterize the energy dissipation during the loading process,and a novel formula for characterizing the damage variable of brittle coal is proposed.On this basis,considering that the constitutive model based on the hypothesis of strain equivalence is incapable of accurately describing the compaction effect exhibited by coal material during the compression process,a correction coefficient is proposed and apply it in the novel damage constitutive model.The established conventional monotone loading and single-cyclic loading-unloading uniaxial compression damage constitutive models have been validated using experimental data from cylindrical and cuboid coal specimens.In addition,compared with the constitutive model obtained via the traditional energy calculation method based on the hypothesis that the unloading curve is a straight line,the constitutive model employing LED law can describe the stress-strain state of brittle coal more precisely.This approach introduces a new perspective and enhances the convenience for constructing the constitutive model based on energy theory.
机标关键词：linearenergydamagemodelbasedbrittlecoalcompaction
论文发表日期：2025-06-30
在线出版日期：2025-10-15（本平台首次上网日期，不代表文献的发表时间）
页数：23( 225-247 )
英文信息