【作者】 单仁亮； 程瑞强； 徐慧玲； 喻华华；

【Author】 SHAN Ren-Hang, CHENG Rui-qiang, XU Hui-ling, YU Hua-hua (Department of Civil Engineering, China University of Mining and Technology, Beijing 100083, China)

【机构】 中国矿业大学(北京)土木工程系；

【摘要】 利用大直径单轴分离式霍普金森压杆装置对云驾岭煤矿无烟煤进行了冲击压缩试验。试验发现云驾岭煤矿无烟煤的动态本构曲线总体上可以分为4个阶段:(1)初始非线性加载段;(2)塑性屈服段;(3)应变强化段;(4)最终的卸载破坏段。具有相应的初始弹性模量、屈服强度与极限强度3个特征参数,并且3个特征参数都随着应变率的增加而提高,但屈服强度与应变率的相关性最好。更多还原

【Abstract】 Impact experiments for anthracite of Yunjialing coal mine are performed on split Hopkinson pressure bar(SHPB) equipment with a large diameter of 75 mm. Generally, dynamic stress-strain curve for this kind of anthracite has four stages which are nonlinear beginning load stage, plastic yielding stage, strengthening stage, and the last unloading breakage stage. Correspondingly, dynamic stress-strain curve has three characteristic parameters, which are the beginning modulus, yield strength and ultimate strength; and all of them go up with strain rate, but yield strength has best correlativity with strain rate. Plastic yielding is the most remarkable character of anthracite under uniaxial dynamic compression.更多还原