物探与化探2017，Vol.41Issue(2)：306-310,5.DOI:10.11720/wtyht.2017.2.17
单轴加载条件下煤岩超声各向异性特征实验
An experimental study of ultrasonic anisotropy of coal under uniaxial loading
摘要
Abstract
In the study of coal rock elastic wave response characteristics,the influence of axial compression on longitudinal wave,transverse wave velocity and attenuation has not been given enough comprehensive consideration.In view of such a situation,three kinds of coal samples which experienced different grades of metamorphism were chosen from the Pingdingshan No.8 mine.Vertical-bedding samples,parallel-bedding and vertical-face cleat samples,parallel-bedding and vertical-butt cleat samples were prepared to conduct water absorption and ultrasonic experiment.Some experimental results have been obtained:First,in the natural state,longitudinal,transverse wave velocity and quality factor in three directions of the three kinds of coal samples are anisotropic,generally longitudinal,transverse wave velocity and quality factor in two directions parallel to bedding are greater than the corresponding data perpendicular to bedding plane.Second,in the coal rock,the longitudinal and transverse wave velocity increases rapidly with the increase of axial pressure in the early stages.After that,the velocity increases slowly and the wave velocity decreases rapidly until the coal sample is destroyed,the transverse wave velocity is not as obvious as the longitudinal wave.Third,in the three directions,the quality factor increases firstly and then decreases with the increase of stress,and Qs is generally larger than that of Qp.Fourth,in coal samples of different metamorphic grades,longitudinal,transverse wave velocity and quality factor differences are more obvious,longitudinal,transverse wave velocity of 1/3 coke is greater than that of coking coal and that of the fat coal.关键词
单轴加载/各向异性/弹性波速度/衰减/割理Key words
uniaxial loading/anisotropy/elastic wave velocity/attenuation/cleat分类
天文与地球科学引用本文复制引用
赵宇,张玉贵,周俊义..单轴加载条件下煤岩超声各向异性特征实验[J].物探与化探,2017,41(2):306-310,5.基金项目
国家科技重大专项“全国重点煤矿区瓦斯(煤层气)赋存规律和控制因素”(2011ZX05040-005) （煤层气）
河南省科技攻关计划项目“煤体吸附膨胀变形各向异性特性实验研究”(162102310427) （162102310427）
