煤矿安全2024，Vol.55Issue(2)：133-140,8.DOI:10.13347/j.cnki.mkaq.20221990
循环梯度加载下煤岩损伤破坏特性及能量演化规律研究
Research on damage characteristics and energy evolution law of coal rock under cyclic gradient loading
摘要
Abstract
In coal mining,the rock mass is often in the process of repeated cyclic loading due to the influence of excavation and un-loading factors.In order to study the damage and failure characteristics and energy evolution law of coal and rock under cyclic gradi-ent loading,a uniaxial cyclic gradient loading experiment was carried out on coal samples,and deformation failure characteristics,in-put energy density,dissipated energy density and damage variables of the coal samples under different cyclic gradient loading were compared and analyzed.The results show that with the increase of the cyclic gradient stress,the number of cycles and the peak strength of the coal samples decrease,which are 17.97,14.86,11.23,and 10.53 MPa;in cyclic gradient loading,most of the input en-ergy density is stored inside the rock sample in the form of elastic strain energy,and the dissipation energy increases between 0.2%and 40%of the total input energy in a single cycle.Cumulative dissipation is selected as the quantitative index of the whole process of coal and rock damage,and the Logistic equation is used to fit the coal and rock damage,and the evolution model of coal and rock damage is obtained.关键词
煤岩损伤/围岩控制/循环梯度加载/破坏变形/耗散能/能量演化/损伤特性Key words
coal rock damage/surrounding rock control/cyclic gradient loading/failure deformation/dissipated energy/energy evolution/damage characteristics分类
矿业与冶金引用本文复制引用
张民波,李春欣,张世龙,黄强勇,牛艺骁,贾雨豪,刘任涛..循环梯度加载下煤岩损伤破坏特性及能量演化规律研究[J].煤矿安全,2024,55(2):133-140,8.基金项目
国家自然科学基金地区基金资助项目(52064046) （52064046）
武汉工程大学大学生创新训练资助项目(S202110490013) （S202110490013）
武汉工程大学第 13 届研究生创新教育基金资助项目(CX2021484) （CX2021484）
