摘要
利用自行研制开发的双向约束摆锤式冲击动力加载试验装置并配合超声波检测设备,从煤岩材料的细观力学特性入手,对型煤与原煤在不同约束条件下、不同冲击荷载作用方式对其内部结构发展演化规律进行了系统研究,并对影响机理进行了理论探讨。结果表明:煤样损伤量随着冲击次数的增大而增大并具有非线性累计效应;在固定其双向约束条件下,初次冲击能量较低时煤样后期存在损伤增量变大的趋势;随着初次冲击能量的增加,煤样在试验初期就会出现损伤加剧的情况,后期煤样损伤增量反而缓慢降低;当轴向应力提高时,在相同能量冲击下煤样损伤增量变大,累计损伤效应被放大,煤样更容易达到破坏极限。
In this paper,the impact dynamic loading test was conducted with self-developed bidirectional constraint pendulum impact dynamic loading test device and the ultrasonic testing equipment.Starting with the meso-mechanical properties of coal and rock materials,a systematic study was conducted on the development and evolution of internal structure of briquette and raw coal under different constraints and different impact loading modes.And the potential impact mechanism was discussed theoretically.The results have shown that damage amount of coal samples increases with the growing number of impacts and has a non-linear cumulative effect;under the condition of fixed bidirectional constraint,the damage increment of coal sample increases in the later period when the initial impact energy is low;with the increase of the initial impact energy,the damage of coal samples is aggravated at the beginning of the test,and slowly decreases in the later stage;when the axial stress increases,the damage increment increases even under the same energy impact,the associated cumulative damage effect is amplified,which makes coal samples more easily damaged.
作者
赵洪宝
吉东亮
王涛
程辉
刘瑞
文志杰
ZHAO Hongbao;JI Dongliang;WANG Tao;CHENG Hui;LIU Rui;WEN Zhijie(School of Energy and Mining Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China;State Key Laboratory of Mining Disaster Prevention and Control Co-Founded by Shandong Province and Ministry of Science and Technology,Shandong University of Science and Technology,Qingdao,Shandong 266590,China)
出处
《采矿与安全工程学报》
EI
CSCD
北大核心
2021年第2期353-360,共8页
Journal of Mining & Safety Engineering
基金
越崎杰出学者项目(800015Z1179)
国家自然科学基金项目(51474220)
中央基本科研业务费项目(2009QZ03)。
关键词
双向约束
冲击荷载
损伤量
非线性累计效应
bidirectional constraint
impact load
damage amount
nonlinear cumulative effect
