中南大学学报（自然科学版）2016，Vol.47Issue(7)：2469-2475,7.DOI:10.11817/j.issn.1672-7207.2016.07.039
煤岩组合体分级循环加卸载力学特性的实验研究
Experimental research of mechanical properties on grading cycle loading-unloading behavior of coal-rock combination bodies at different stress levels
摘要
Abstract
To research the mechanical properties of coal−rock combination bodies under multistage and cyclical loading−unloading, a multistage and cyclical uniaxial loading−unloading test (consisting of repeated loading and unloading) was conducted by using the MTS815 System. The results show that the shear failure is the main failure type occurring in the coal−rock combination bodies under multistage uniaxial cyclical loads. Crack propagation in the coal−rock combination bodies under multistage cyclical loads reduces the overall strength of the samples, resulting in more severe failure than in uniaxial compression test. At the first stage of the testing, the strain curve and energy dissipation curve of the samples for a single cycle tend to drop sharply and then go into a slower decline. Moreover, the initial stress shows a positive correlation with dissipate energy and strain.关键词
煤岩组合体/分级循环加卸载/整体强度/耗散能Key words
coal-rock combination body/multistage cyclical loading-unloading/overall strength/energy dissipation分类
建筑与水利引用本文复制引用
朱卓慧,冯涛,宫凤强,叶洲元,喻智..煤岩组合体分级循环加卸载力学特性的实验研究[J].中南大学学报（自然科学版）,2016,47(7):2469-2475,7.基金项目
国家自然科学基金资助项目(51274095，51204068)；煤炭资源与安全开采国家重点实验室开放研究基金资助项目(13KF06)(Projects(51274095,51204068) supported by the National Natural Science Foundation of China （51274095，51204068）
Project(13KF06) supported by the Open Projects of State Key Laboratory of Coal Resources and Safe Mining, CUMT) （13KF06）
