1. College of Resource and Safety Engineering,China University of Mining and Technology( Beijing),Beijing　 100083,China; 2. College of Quality and Safety Engineering,China Jiliang University,Hangzhou　 310018,China

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 theoreti-cally 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 that ① under the same impact velocity,the damage form of gas-containing coal sample and common coal sample is obviously different and the former damage degree is more serious. ② Under 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 com-pressive stress-induced destruction,and shows the characteristic of central swelling and destruction. ③ When the im-pact velocity is the same,the gas pressure in gas-bearing coal is bigger and the damage degree is larger. The main pa-rameters of the HJC model of gas-containing coal can simulate the dynamic process of the impact damage of gas-containing coal well.

XIE Beijing,ZHAO Zeming,XU Xiaomeng,et al. HJC constitutive model and numerical simulation of hammer damage with gas-containing coal[J]. Journal of China Coal Society,2018,43 (10):2789 -2799. d