摘要
为了进一步研究煤体爆破裂纹扩展规律,以煤体爆破裂纹扩展速度为研究内容,选取0.14 mm漆包铜线和0.7 mm铅笔芯作为探针传感器材料,利用爆速仪改进的裂纹扩展测试系统对煤体内部和表面裂纹扩展速度进行测试。试验结果表明:煤体爆破裂纹扩展速度变化规律与煤体的力学性质、波阻抗及初始裂纹数量等因素有关。在初始裂纹的导向作用下,煤体中的爆破裂纹扩展速度大致经历先迅速衰减、然后近似匀速、最后缓慢衰减3个阶段。
In order to further study the blasting crack propogation law in coal,this paper studied on its propagation velocity.The paint package copper wire of 0.14 mm in diameter and pencil core of 0.7 mm in diameter as the probe sensor material were selected,the blasting crack propagation velocity in internal and surface of coal was measured using the crack propagation test system with the detonation velocity meter.The test results show that the blasting crack propagation velocity law in coal is related to the mechanical properties of coal,wave impedance,the number of initial crack and so on.Under the guiding effect of initial crack,the blasting crack propagation velocity in coal experiences three stages:the first rapid attenuate,approximately uniform speed stage and the final slow attenuate.
作者
杨小林
孙博
褚怀保
YANG Xiao-lin;SUN Bo;CHU Huai-bao(School of Civil Engineering,Henan Polytechnic University,Jiaozuo 454000,China;Department of Civil Engineering,Luoyang Institute of Science and Technology,Luoyang 471000,China)
出处
《爆破》
CSCD
北大核心
2011年第4期1-5,10,共6页
Blasting
基金
国家自然科学基金(50874039)
河南理工大学研究生学位论文创新基金(cx-2010-10)
关键词
煤体
爆速仪
裂纹扩展速度
试验研究
coal
detonation velocity meter
Crack propagation velocity
experimental study
