煤矿安全2024，Vol.55Issue(5)：28-34,7.DOI:10.13347/j.cnki.mkaq.20240313
应力扰动路径对煤岩力学性能的影响试验研究
Experimental study on the influence of stress disturbance path on the mechanical properties of coal specimens
摘要
Abstract
During pumped energy storage using abandoned mines,coal pillars are not only affected by monotonic loads,but also suf-fer from frequent stress disturbances.The strength and deformation characteristics as well as the failure mode of the coal specimens under the influence of monotonic loading(stress path 1),multilevel constant-amplitude cyclic loading(stress path 2)and multilevel increasing cyclic loading(stress path 3)were studied using the coal samples from Hepan Coal Mine,Shaanxi Province,as the re-search object.The test results showed that the stress-strain curves of the coal specimens under cyclic loading formed obvious hyster-esis loops,and the area of hysteresis loops increased significantly with the rise of stress level;compared with the axial strain,the cir-cumstantial strain was more sensitive to the stress path;the peak strength and peak axial strain of the coal samples were the largest under monotonic loading,and the peak strength and axial strain of the specimens decreased by 22.12%and 18.35%(path 2)and 5.30%and 10.34%(path 3)under multi-level cyclic loading,respectively;the tangent modulus of the specimens under stress path 2 was significantly higher than the other stress paths;the stress paths had not changed the macroscopic failure mode of the coal speci-mens,but the cyclic loading caused the number and size of cracks on the specimen's surface to become larger.关键词
煤岩力学性能/单调荷载/应力扰动/变形特征/煤岩破坏模式Key words
mechanical properties of coal and rock/monotonic loading/stress disturbance/deformation characteristics/failure mode of coal and rock分类
矿业与冶金引用本文复制引用
刘成勇,王翰秋,刘治成,吴继飞,赵萌烨,张新福,刘雪峰,张进鹏..应力扰动路径对煤岩力学性能的影响试验研究[J].煤矿安全,2024,55(5):28-34,7.基金项目
国家自然科学基金资助项目(52304145) （52304145）
山东省自然科学基金资助项目(ZR2021QE233) （ZR2021QE233）
