摘要
利用自制的声波参数测试系统实验研究了煤体加载过程中声波波速变化规律。研究结果表明:随着加载过程轴压或者围压的增大,试样的纵横波速表现出非线性增大趋势,并且波速增大过程中有明显的阶段化特征,最后趋于稳定;试样在受力加载过程中,试样纵横波波速比逐渐减小;建立了应力和纵波波速的关系式,理论分析表明,随着应力的增加,孔隙度减小,颗粒间的接触面积增大,引起波速的增大。
The law of acoustic wave velocity change in coal during loading is studied by the use of self - made acoustic parameter test system. The research results show that during loading with the increase of axial compression or confining pressure, the nonlinear in- creasing of the longitudinal and transverse wave velocity in coal sample can be got. And the phase characteristics can be seen signifi- cantly in the process of wave velocity increase and finally the value of wave velocity remains stable. During loading, the longitudinal and transverse wave ratio decreases. The relation between the stress and the longitudinal wave is established and it can be known from theoretical analysis that with the increase of stress, the porosity decreases and the contact area between particles increases, which cau- ses the increase of velocity.
出处
《煤矿安全》
CAS
北大核心
2016年第1期13-16,共4页
Safety in Coal Mines
基金
国家自然科学基金资助项目(51304212)
教育部高等学校博士学科点专项科研基金资助项目(20120023120005)
北京高等学校青年英才计划资助项目(YETP0930)
中央高校基本科研业务费专项资金资助项目(2009QZ09)
关键词
煤体加载
应力
波速
纵波
横波
coal body loading
stress
wave velocity
longitudinal wave
transverse wave
