含瓦斯煤锤击破坏HJC本构模型及数值模拟  

HJC constitutive model and numerical simulation of hammer damage with gas-containing coal

作　　者：解北京[1] 赵泽明 徐晓萌 赵越超[1] XIE Beijing;ZHAO Zeming;XU Xiaomeng;ZHAO Yuechao(College of Resource and Safety Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;College of Quality and Safety Engineering,China Jiliang University,Hangzhou 310018,China)

机构地区：[1]中国矿业大学(北京)资源与安全工程学院,北京100083 [2]中国计量大学质量与安全工程学院,浙江杭州310018

出　　处：《煤炭学报》2018年第10期2789-2799,共11页Journal of China Coal Society

基　　金：国家自然科学青年基金资助项目(51404277;51804287);国家自然科学基金资助项目(51274206)

摘　　要：确定含瓦斯煤动态本构关系是认识煤岩动力灾害机理的基础。结合煤吸附瓦斯的"变形效应"特征和Mohr-Coulomb强度理论,理论分析并量化了吸附态和游离态瓦斯对煤体强度的弱化作用,提出的"静态损伤变量法"确定了含瓦斯煤HJC本构模型的主要参数并开展含瓦斯煤落锤冲击破环的数值模拟研究。研究表明:(1)相同的冲击速度下,含瓦斯煤样与普通煤样的破坏形式明显不同,前者破坏程度更严重。(2)相同瓦斯压力下,冲击速度越大,含瓦斯煤样整体破坏越严重,随着冲击速度的增加,破坏由拉压破坏向以压缩应力主导的破坏过渡,并呈现出中心膨胀性破坏的特征。(3)含瓦斯煤在冲击速度相同时,含的瓦斯压力越大,破坏程度亦越大。获得的含瓦斯煤的HJC主要参数能够较好模拟含瓦斯煤冲击破坏的动态过程。Determining the dynamic constitutive relationship of gas containing coal is the basis for understanding the mechanism of coal-rock dynamic disasters.Based on the“deformation effect”characteristics and the Mohr-Coulomb strength theory of coal adsorption gas,the weakening effect of adsorbed and free gas on the strength of coal is theoretically analyzed and quantified,and the“static damage variable method”is proposed.The main parameters of the HJC constitutive model of gas-containing coal are determined,and the numerical simulation of the hammer damage of the gas-containing coal is carried out.The results show that①under the same impact velocity,the damage form of gascontaining coal sample and common coal sample is obviously different and the former damage degree is more serious.②Under the same gas pressure,the greater the impact velocity is,the more serious the damage of the coal-bearing coal sample is.With the increase of impact velocity,the failure transits from the tensile-compressive failure to the compressive stress-induced destruction,and shows the characteristic of central swelling and destruction.③When the impact velocity is the same,the gas pressure in gas-bearing coal is bigger and the damage degree is larger.The main parameters of the HJC model of gas-containing coal can simulate the dynamic process of the impact damage of gas-containing coal well.

关 键 词：含瓦斯煤 HJC本构 冲击破坏 数值模拟 

分 类 号：TD713[矿业工程—矿井通风与安全]