动载应变率对煤岩体损伤的模拟研究

Simulation Study on Damage of Coal and Rock Mass by Dynamic Load Strain Rate

摘要: 基于HJC本构模型对煤岩体试样进行LS-DYNA有限元数值模拟，分析动载载荷变化率对煤岩体损伤的影响规律。结果表明：相同最大载荷压力下载荷作用时间比载荷变化率更能影响煤岩体的损伤。煤岩体发生破坏的最大能量随载荷变化率的增加而降低，发生破坏的时间随载荷变化率的增加而减少，吸收的能量越大破坏越严重；煤岩体发生破坏时的压力随载荷变化率增加而增大，应变与煤岩体的破坏程度一致。
- LS-DYNA /
- 煤岩体 /
- 运载应变率 /
- 模拟 /
- 损伤
Abstract: Based on HJC constitutive model, the LS-DYNA finite element numerical simulation of coal and rock mass is carried out, and the influence of dynamic load strain rate on the damage of coal and rock mass is analyzed. The results show that the working time of load under the same maximum load pressure can affect the damage of coal and rock mass more than the load strain rate, and the maximum energy of destruction of coal and rock mass decreases with the increase of load strain rate. The time of destruction decreases with the increase of load strain rate, and the greater the energy is, the greater the damage is. The pressure of destruction of coal and rock mass increases with the increase of load strain rate, the strain is consistent with the damage degree of coal and rock mass.
- LS-DYNA /
- coal and rock mass /
- dynamic load strain rate /
- simulation /
- damage

[1]	王登科,刘淑敏,魏建平,等.冲击载荷作用下煤的破坏特性试验研究[J].采矿与安全工程学报,2017(3):594-600.
[2]	刘晓辉,张茹,刘建锋.不同应变率下煤岩冲击动力实验研究[J].煤炭学报,2012,37(9):1528-1536.
[3]	李成武,王金贵,解北京,等.基于 HJC 本构模型的煤岩SHPB 实验数值模拟[J].采矿与安全工程学报,2016(1):158-164.
[4]	HOLMQUIST T J, JOHNSON G R, COOK W H. A computational constitutive model for concrete subjective to large strains, high strain rates, and high pressures[C]//The 14th International Symposium on Ballistics. USA: American Defense Preparedness Association, 1993: 593.
[5]	方书昊,李峰,陆新晓,等.动载荷作用下煤柱的动态损伤数值模拟[J].中国煤炭,2017,43(9):21-26.
[6]	钱杰,韩靖,胡鸣.基于ABAQUS的煤岩动态拉伸力学特性研究[J].煤矿安全,2017,48(8):20-22.
[7]	马耕,张帆,刘晓,等.真三轴作用下煤岩水力压裂模拟试验研究[J].煤矿安全,2016,47(11):1-3.
[8]	何江.煤矿采动动载对煤岩体的作用及诱冲机理研究[D].北京:中国矿业大学(北京),2013.
[9]	宋剑锋.ANSYS有限元分析[M].北京:中国铁道出版社,2012:2-17.
[10]	RJ Christensen, SR Swanson, WS Brown. Split-Hopkinson-bar tests on rock under confining pressure[J]. Experimental Mechanics, 1972, 12 (11): 508-513.
[11]	金解放,李夕兵,殷志强,等.轴压和循环冲击次数对砂岩动态力学特性的影响[J].煤炭学报,2012,37(6):923-930.