基于COMSOL钻孔参数对超声波传播特性影响研究  

Effects of COMSOL-based Borehole Parameters on Ultrasonic Propagation Characteristics

作　　者：兰国庆 LAN Guoqing(Zijin Mining Industry Co.,Ltd.,Fanshi 034300,China)

机构地区：[1]山西紫金矿业公司,山西繁峙034300

出　　处：《山西煤炭》2024年第4期80-90,共11页Shanxi Coal

摘　　要：为研究钻孔角度和钻孔直径对瓦斯抽采钻孔裂隙扩展的影响规律,利用COMSOL软件模拟不同钻孔角度、不同直径含孔试件的超声波信号变化,通过分析声波透射波信号、声压极值和声压等值面的变化规律,反演得到钻孔周围裂隙扩展特征。结果表明:当钻孔角度由0°增加到30°时,波幅透射系数降低25.84%,声压极大值逐渐降低;当钻孔直径由4 mm增加到8 mm时,波幅透射系数降低38.2%,声压极大值逐渐降低。随着钻孔角度和直径的增加,透射波信号传播性变弱,声压分布变化更加明显,且声压极大值增大;钻孔裂隙扩展区域增大,钻孔破坏更加严重。To investigate the influence of drilling angle and drilling diameter on crack propagation in gas extraction boreholes,COMSOL software was utilized to simulate the ultrasonic signal variation in borehole specimens at different drilling angles and diameters.By analyzing the variation patterns of acoustic transmitted wave signals,sound pressure extreme values,and sound pressure isosurface,the crack propagation characteristics around the borehole were obtained by inversion.The results showed that,as the drilling angle increased from 0°to 30°,the amplitude transmission coefficient decreased by 25.84%,and the maximum value of sound pressure gradually reduced.When the drilling diameter increased from 4 to 8 mm,the amplitude transmission coefficient decreased by 38.2%,and the maximum value of sound pressure gradually reduced.With the drilling angle and diameter increasing,the propagation of transmitted wave signals became weaker,the sound pressure distribution changed more obviously,and the maximum value of the sound pressure increased.Additionally,the fracture propagation area of the borehole expanded,indicating more severe borehole damage.

关 键 词：钻孔模拟 声压 波幅透射系数 声压等值面 

分 类 号：TD712[矿业工程—矿井通风与安全]