摘要
冲击地压、煤与瓦斯突出等煤矿典型动力灾害事故是影响煤矿安全生产的主要问题之一。为研究煤体周围应力对动力灾害演化过程的影响,采用主动三轴霍普金森压杆(SHPB)试验系统,对相同加载率不同围压下煤体开展三轴动态压缩试验研究。试验结果表明,随着围压增加,煤体的峰值强度呈线性增长,其线性拟合度为95.88%,宏观破碎状态由完全破碎向未破碎稳步过渡;此外,围压大小不改变煤体从加载至损伤破碎的所需时间,只改变其动态强度和破坏应变大小。试验结果说明煤层水平主应力越大,煤体所需完全破碎的能量越大,且动力灾害的破坏程度越剧烈;并且,煤层赋存区域应力场大小不改变单位体积煤体的灾变时间,只会影响灾害破坏强度和剧烈程度。该研究有助于完善三轴煤岩动力学,为研究煤体赋存应力场环境对动力灾害的影响提供了理论基础。
Typical coal mine dynamic disasters such as rock burst,as well as coal and gas outburst are the main problems affecting coal mine safety production.In order to study the influence of the stress around the coal mass on the evolution process of dynamic disasters,an active triaxial Hopkinson pressure bar(SHPB)experimental system was used to carry out triaxial dynamic compression experiments on the coal mass under the same loading rate and different confining pressures.The experimental results show that as the confining pressure increases,the peak strength of the coal mass increases linearly,with a linear fit of 95.88%,and the macroscopic crushing state transits steadily from completely broken to unbroken.In addition,the confining pressure does not change the time required for coal mass from load to damage and break,but only changes its dynamic strength and failure strain.The experimental results show that the greater the horizontal principal stress of the coal seam,the greater the energy required for the coal to be completely broken,and the more severe the damage of the dynamic disaster.And the size of the stress field in the coal seam storage area does not change the disaster time per unit volume of the coal,but affects the intensity and severity of disaster damage.This research is helpful to improve triaxial coal and rock dynamics,and provides a theoretical basis for studying the influence of the stress field environment in coal mass on dynamic disasters.
作者
程春晖
薛生
韩一丹
CHENG Chunhui;XUE Sheng;HAN Yidan(School of Safety Science and Engineering,Anhui University of Science and Technology,Huainan,Anhui 232000,China)
出处
《矿业研究与开发》
CAS
北大核心
2021年第11期101-106,共6页
Mining Research and Development
基金
国家自然科学基金重点项目(51934007)
安徽理工大学研究生创新基金项目(2020CX2012)
山东省重点科技创新工程项目(2019JZZY020504)。
关键词
煤岩动力灾害
三轴SHPB
围压
动态压缩
Coal and rock dynamic disaster
Triaxial SHPB
Confining pressure
Dynamic compression
