不同围压下煤层波速的实验分析  

Experimental Analysis of Wave Velocity of Coal Seam Under Different Confining Pressure

作　　者：童继强 杨德义[1] 李志军 任华育 王增玉 

机构地区：[1]太原理工大学矿业工程学院,山西太原030024

出　　处：《煤矿安全》2017年第11期49-52,共4页Safety in Coal Mines

基　　金：国家自然科学基金资助项目(41374131);山西省煤基重点科技攻关资助项目(MQ2014-01)

摘　　要：对采自阳泉某矿15号煤层的6块煤样进行了常温变压条件下的超声波实验,分析了围压变化对煤层速度的影响。结果表明,煤层的纵、横波速度随着围压的增加而增大,且与压力之间存在较好的二次相关关系;不同裂隙发育程度的煤样随围压的增加其波速增幅比不同;不同围压条件下煤层纵横波速度之间具有较好的线性正相关关系。通过变方位超声波测试的数据分析,该煤层有明显的横波速度各向异性,并确定了煤层的主裂隙方向。An ultrasonic wave experiment of six coal samples from 15#coal strata in Yangquan coal mining area was conducted under normal temperature and variable pressure condition in this paper, and the effect of confining pressure on coal seam wave velocity was analyzed. Results show that both of the P-wave and S-wave velocity of the samples increase with the confining pressure and have close second phase correlation with the pressure. The increased amplitude rate of coal samples with different fracture development degree is different with the increase of the confining pressure; there is a good linear positive correlation between P-wave and S-wave under different confining pressure conditions. By the data analysis from variable-azimuth ultrasonic testing,the coal seam has an obvious S-wave velocity anisotropy, and the direction of main fractures of this coal seam is determined.

关 键 词：围压 煤样 超声波 各向异性 煤层波速 

分 类 号：TD713[矿业工程—矿井通风与安全]