不同动载对煤岩块的破坏作用数值模拟  

Numerical simulation of failure of coal and rock blocks under different dynamic loads

作　　者：方书昊 霍雨佳 郭晋麟 白志鹏 暴庆丰 朱红青[1] FANG Shuhao;HUO Yujia;GUO Jinlin;BAI Zhipeng;BAO Qingfeng;ZHU Hongqing(School of Emergency Management and Safety Engineering,China University of Mining&Technology(Beijing),Beijing 100083,China;Lu’an Chemical Group Co.,Ltd.,Changzhi 046200,China)

机构地区：[1]中国矿业大学(北京)应急管理与安全工程学院,北京100083 [2]潞安化工集团有限公司,山西长治046200

出　　处：《煤矿安全》2021年第1期184-188,193,共6页Safety in Coal Mines

基　　金：国家重点研发计划资助项目(2016YFC0801800);国家自然科学基金资助项目(51704299,51804311)。

摘　　要：以HJC本构模型进行数值模拟,分析动载作用下煤岩块的应力场、应变场及能量场动态变化过程。结果表明:载荷变化率的改变对煤岩块的破坏形态影响最大,其次是载荷的最大压力值,最后是作用时间;5种载荷压力形式下,煤岩块的动能、内能和总能量3种能量随时间变化趋势一致;煤岩块未破坏时,3种能量随时间增加;煤岩块发生破坏时,动能最终降为0,内能有所降低;煤岩块破坏越严重,3种能量降低的程度越大。煤岩块达到临界应力时只是发生轻微破坏,随后达到最大总能量时才发生严重破坏。压力和作用时间达到一定值时煤岩块才发生破坏,载荷变化率方向的改变增大了煤岩块的破坏能力。The numerical simulation of HJC constitutive model is carried out to analyze the dynamic changes of the stress field,strain field and energy field of coal and rock mass under dynamic loading process. The results show that the change of load change rate has the greatest influence on the failure mode of coal and rock mass, followed by the maximum pressure value of the load, and finally the action time. Under the five kinds of load pressures, the kinetic energy, internal energy and total energy of coal and rock mass are consistent with time. When coal and rock mass is not destroyed, these three kinds of energy increase with time. When coal and rock mass is destroyed, the kinetic energy is finally reduced to zero, and the internal energy is reduced. The more severe coal and rock mass damage, the greater the reduction of the three types of energy. When coal and rock mass reaches the critical stress, only minor damage occurs, and then the maximum damage is reached when the maximum total energy is reached. When the pressure and the action time reach a certain value, coal and rock mass will be destroyed, and the change of the load change rate will increase the damage capacity of coal and rock mass.

关 键 词：HJC 煤岩块 动载 载荷变化率 能量 动力灾害 围岩变形 

分 类 号：TD313[矿业工程—矿井建设]