摘要
深孔预裂爆破技术是高瓦斯低透气性煤层强化增透瓦斯抽采的重要途径之一。以连续介质力学为基础,建立了煤体在爆轰荷载作用下动态损伤本构模型,并将此模型嵌入非线性有限元程序LS-DYNA中,对爆轰应力波在不同弹性模量煤体中传播和衰减特性进行了数值模拟;通过对现场深孔预裂爆破专用药柱爆炸引起的爆破振动进行监测,获得了爆轰应力波在高瓦斯煤层中的传播和衰减特性,爆轰实验结果与模拟结果基本吻合,验证了所建立本构模型的合理性与正确性。研究表明:在传播距离小于4.8 m时,爆轰应力波具有较高的峰值,并迅速衰减,在传播距离大于约4.8 m以后,爆轰应力波峰值较低且衰减幅度逐渐趋于平缓。
Deep-hole pre-splitting explosion is an important way to intensified improve permeability of high-gas and low permeability coal-beds. Based on continuum mechanics, explosion dynamic damage constitutive model of coal under the impact of explosion was established and embedded into nonlinear finite element program LS-DYNA, and propagation and attenuation characteristics of stress waves generated by explosion in coal of different modulus was numerical simu- lated. Through the monitor of on-site blasting vibration of specialty explosive, propagation and attenuation characteris- tics of stress waves generated by explosion in high-gas coal-beds was acquired. Simulation results is basically coordi- nate with results of explosion experiments, and the reasonableness and correctness is verified. The researching results show that ： when propagating distance is less than 4.8 m, the explosion stress waves have high peak values and sharply attenuate ; when propagating distance is larger than 4.8 m, the explosion stress waves have low peak values and attenu- ation rate gradually going flatten.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2014年第1期110-114,共5页
Journal of China Coal Society
基金
国家自然科学基金资助项目(51304006)
安徽省教育厅重点资助项目(KJ2011A075)
安徽理工大学青年骨干培养基金资助项目(20120012)
关键词
爆轰应力波
衰减特性
高瓦斯煤层
深孔预裂爆破
stress waves generated by explosion
attenuation characteristics
high-gas coal-bed
deep-hole pre-splitting explosion
