CAJ | 학술논문

为定量研究岩石中速度误差或偏差对声发射源定位精度的影响,分别就一维线和二维平面情况下岩石中声发射源定位情况进行试验.对于线定位,采用花岗岩岩杆,对于平面问题,采用正方体大理岩,用铅笔芯折断的声音模拟声发射源.为比较线定位与平面定位的精度,在大理岩上表面的中线上进行线定位.从速度的多次测量结果来看,线定位的速度变异系数较平面定位各个方向要小.研究发现,对于线定位,绝对距离最大误差在0.8cm左右,当速度相差200 m/s时,绝对距离定位误差相差0.4 cm左右;对于平面定位,在传感器30 cm的阵列情况下,绝对距离定位高达5 cm,甚至8.7 cm,可见,平面定位速度严重影响定位精度;平面定位误差较线定位误差大,说明在工程实际中,能用线定位解决的问题尽量不用面定位;与常规认识不一致的是,平面定位中6个方向速度的平均值的定位精度不是最小的,而对角线上速度的均值的定位精度最小.
위정량연구암석중속도오차혹편차대성발사원정위정도적영향,분별취일유선화이유평면정황하암석중성발사원정위정황진행시험.대우선정위,채용화강암암간,대우평면문제,채용정방체대리암,용연필심절단적성음모의성발사원.위비교선정위여평면정위적정도,재대리암상표면적중선상진행선정위.종속도적다차측량결과래간,선정위적속도변이계수교평면정위각개방향요소.연구발현,대우선정위,절대거리최대오차재0.8cm좌우,당속도상차200 m/s시,절대거리정위오차상차0.4 cm좌우;대우평면정위,재전감기30 cm적진렬정황하,절대거리정위고체5 cm,심지8.7 cm,가견,평면정위속도엄중영향정위정도;평면정위오차교선정위오차대,설명재공정실제중,능용선정위해결적문제진량불용면정위;여상규인식불일치적시,평면정위중6개방향속도적평균치적정위정도불시최소적,이대각선상속도적균치적정위정도최소.
To quantitatively study the location errors induced by deviation of sonic speed,the line and plane location tests were carried out.A broken pencil was simulated as acoustic emission source in the rocks.The line and plane location tests were carried out in the granite rod using two sensors and the cube of marble using four sensors,respectively.To compare the position accuracy between line and plane positions,the line poison test was also carried out on the marble surface.The results show that for line positioning,the maximum error of absolute distance is about 0.8 cm.With the speed difference of 200 m/s,the average value of absolute difference from the position error is about 0.4 cm.For the plane positioning,in the case of the sensor array of 30 cm,the absolute positioning distance is up to 8.7 cm.It can be seen that the sonic speed seriously impacts on the plane positioning accuracy.The plane positioning error is lager than the line positioning error,which means that when the line position can satisfy the need in practical engineering,it is better to use the line position instead of the plane location.The plane positioning error with the diagonal speed is the minimum one.